© 2008 Microchip Technology Inc. DS21795D-page 1
93AA66A/B/C, 93LC66A/B/C,
93C66A/B/C
Device Selection Table
Features:
• Low-Power CMOS Technology
• ORG Pin to Select Word Size for ‘66C’ Version
• 512 x 8-bit Organization ‘A’ Devices (no ORG)
• 256 x 16-bit organization ‘B’ Devices (no ORG)
• Self-tImed Erase/Write Cycles (including
Auto-Erase)
• Automatic Erase All (ERAL) Before Write All
(WRAL)
• Power-On/Off Dat a Protection Circuitry
• Industry Standard 3-Wire Serial I/O
• Device Status Signal (Ready/Busy)
• Sequential Read Function
• 1,000,000 Erase/Write Cycles
• Data Retention > 200 Years
• Pb-free and RoHS Compliant
• Temperature Ranges Supported:
Pin Function Table
Description:
The Microchip Technology Inc. 93XX66A/B/C devices
are 4Kbit low-voltage serial Electrically Erasable
PROMs (EEPROM). Word-selectable devices such as
the 93AA66C, 93LC66C or 93C66C are dependent
upon external logic levels driving the ORG pin to set
word size. For dedicated 8-bit communication, the
93XX66A devices are available, while the 93XX66B
devices provide dedicated 16-bit communication.
Advanced CMOS technology makes these devices
ideal for low-power, nonvolatile memory applications.
The entire 93XX Series is available in standard
packages including 8-lead PDIP and SOIC, and
advanced packaging including 8-lead MSOP, 6-lead
SOT-23, 8-lead 2x3 DFN and 8-lead TSSOP. All
packages are Pb-free (Matte Tin) finish.
Part Number VCC Range ORG Pin Word Size Temp Ranges Packages
93AA66A 1.8-5.5 No 8-bit I P, SN, ST, MS, OT, MC
93AA66B 1.8-5-5 No 16-bit I P, SN, ST, MS, OT, MC
93LC66A 2.5-5.5 No 8-bit I, E P, SN, ST, MS, OT, MC
93LC66B 2.5-5.5 No 16-bit I, E P, SN, ST, MS, OT, MC
93C66A 4.5-5.5 No 8-bit I, E P, SN, ST, MS, OT, MC
93C66B 4.5-5.5 No 16-bit I, E P, SN, ST, MS, OT, MC
93AA66C 1.8-5.5 Yes 8- or 16-bit I P, SN, ST, MS, MC
93LC66C 2.5-5.5 Yes 8- or 16-bit I, E P, SN, ST, MS, MC
93C66C 4.5-5.5 Yes 8- or 16-bit I, E P, SN, ST, MS, MC
- Industrial (I) -40°C to +85°C
- Automotive (E) -40°C to +125°C
Name Function
CS Chip Select
CLK Serial Data Clock
DI Serial Data Input
DO Serial Data Output
VSS Ground
NC No internal connection
ORG Memory Configuration
VCC Power Supply
4K Microwire Compatible Serial EEPROM
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
DS21795D-page 2 © 2008 Microchip Technology Inc.
Package Types (not to scale)
CS
CLK
DI
DO
1
2
3
4
8
7
6
5
V
CC
NC
ORG
*
V
SS
PDIP/SOIC
(P, SN)
CS
CLK DI
DO
1
2
3
4
8
7
6
5
V
CC
NC ORG*
V
SS
ROTATED SOIC
(ex: 93LC46BX)
TSSOP/MSOP
CS
CLK
DI
DO
1
2
3
4
8
7
6
5
V
CC
NC
ORG*
V
SS
(ST, MS) SOT-23
DO
V
SS
DI
1
2
3
6
5
4
V
CC
CS
CLK
(OT)
*ORG pin is NC on A/B devices.
DFN
CS
CLK
DI
DO
NC
ORG*
VSS
VCC
8
7
6
5
1
2
3
4
(MC)
© 2008 Microchip Technology Inc. DS21795D-page 3
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
1.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings(†)
VCC.............................................................................................................................................................................7.0V
All inputs and outputs w.r.t. VSS .................................... ... ....................................... ... .........................-0.6V to V CC +1.0V
Storage temperature ...............................................................................................................................-65°C to +150°C
Ambient temperature with power applied................................................................................................-40°C to +125°C
ESD protection on all pins ......................................................................................................................................................≥ 4kV
TABLE 1-1: DC CHARACTERISTICS
† NOTICE: Stresses above those listed under “Absolute Maxi mum Ratings” may cause permanent damage to the
device. This is a stress rating only and functional operation of the device at those or any other conditions above those
indicated in the operational listings of this specification is not implied. Exposure to maximum rating conditions for
extended periods may affect device reliability.
All parame ters apply over the specified
ranges unless oth e rwise noted. Industrial (I): TA = -40°C to +85°C, VCC = +1.8 V to +5.5V
Automotive (E): TA = -40°C to +125°C, VCC = +2.5V to +5.5 V
Param.
No. Symbol Parameter Min Typ Max Units Conditions
D1 VIH1
VIH2High-level input voltage 2.0
0.7 VCC —
—VCC +1
VCC +1 V
VVCC ≥ 2.7V
VCC < 2.7V
D2 VIL1
VIL2Low-level input voltage -0.3
-0.3 —
—0.8
0.2 VCC V
VVCC ≥ 2.7V
VCC < 2.7V
D3 VOL1
VOL2Low-level output voltage —
——
—0.4
0.2 V
VIOL = 2.1 mA, VCC = 4.5V
IOL = 100 μA, VCC = 2.5V
D4 VOH1
VOH2High-level output voltage 2.4
VCC - 0.2 —
——
—V
VIOH = -400 μA, VCC = 4.5V
IOH = -100 μA, VCC = 2.5V
D5 ILI Input leakage current — — ±1 μAVIN = VSS or VCC
D6 ILO Output leakage current — — ±1 μAVOUT = VSS or VCC
D7 CIN,
COUT Pin capacitance (all inputs/
outputs) ——7 pFVIN/VOUT = 0V (Note 1)
TA = 25°C, FCLK = 1 MHz
D8 ICC write Write current —
——
500 2
—mA
μAFCLK = 3 MHz, Vcc = 5.5V
FCLK = 2 MHz, Vcc = 2.5V
D9 ICC read Read current —
—
—
—
—
100
1
500
—
mA
μA
μA
FCLK = 3 MHz, VCC = 5.5V
FCLK = 2 MHz, VCC = 3.0V
FCLK = 2 MHz, VCC = 2.5V
D10 ICCS Standby current —
——
—1
5μA
μAI – Temp
E – Temp
CLK = Cs = 0V
ORG = DI = VSS or VCC
(Note 2) (Note 3)
D11 VPOR VCC voltage detect
93AA66A/B/C, 93LC66A/B/C
93C66A/B/C —
—1.5V
3.8V —
—V
V(Note 1)
Note 1: This parameter is periodically sampled and not 100% tested.
2: ORG pin not available on ‘A’ or ‘B’ versions.
3: Ready/Busy status must be cleared from DO; see Sectio n 3.4 "Data Out (DO)".
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
DS21795D-page 4 © 2008 Microchip Technology Inc.
TABLE 1-2: AC CHARACTERISTICS
All parame ters apply over the specified
ranges unless otherwise noted. Industrial (I): TA = -40°C to +85°C, VCC = +1.8 V to +5.5V
Automotive (E): TA = -40°C to +125°C, VCC = +2.5V to +5.5V
Param.
No. Symbol Parameter Min Max Units Conditions
A1 FCLK Clock frequency — 3
2
1
MHz
MHz
MHz
4.5V ≤ VCC < 5.5V, 93XX66C only
2.5V ≤ VCC < 5.5V
1.8V ≤ VCC < 2.5V
A2 TCKH Clock high time 200
250
450
—ns
ns
ns
4.5V ≤ VCC < 5.5V, 93XX66C only
2.5V ≤ VCC < 5.5V
1.8V ≤ VCC < 2.5V
A3 TCKL Clock low time 100
200
450
—ns
ns
ns
4.5V ≤ VCC < 5.5V, 93XX66C only
2.5V ≤ VCC < 5.5V
1.8V ≤ VCC < 2.5V
A4 TCSS Chip Select setup time 50
100
250
—ns
ns
ns
4.5V ≤ VCC < 5.5V
2.5V ≤ VCC < 4.5V
1.8V ≤ VCC < 2.5V
A5 TCSH Chip Select hold time 0 — ns 1.8V ≤ VCC < 5.5V
A6 TCSL Chip Select low time 250 — ns 1.8V ≤ VCC < 5.5V
A7 TDIS Data input setup time 50
100
250
—ns
ns
ns
4.5V ≤ VCC < 5.5V, 93XX66C only
2.5V ≤ VCC < 5.5V
1.8V ≤ VCC < 2.5V
A8 TDIH Data input hold time 50
100
250
—ns
ns
ns
4.5V ≤ VCC < 5.5V, 93XX66C only
2.5V ≤ VCC < 5.5V
1.8V ≤ VCC < 2.5V
A9 TPD Data output delay time — 200
250
400
ns
ns
ns
4.5V ≤ VCC < 5.5V, CL = 100 pF
2.5V ≤ VCC < 4.5V, CL = 100 pF
1.8V ≤ VCC < 2.5V, CL = 100 pF
A10 TCZ Data output disable ti me — 100
200 ns
ns 4.5V ≤ VCC < 5.5V, (Note 1)
1.8V ≤ VCC < 4.5V, (Note 1)
A11 TSV Status valid time — 200
300
500
ns
ns
ns
4.5V ≤ VCC < 5.5V, CL = 100 pF
2.5V ≤ VCC < 4.5V, CL = 100 pF
1.8V ≤ VCC < 2.5V, CL = 100 pF
A12 TWC Program cycle time — 6 ms Erase/Write mode (AA and LC
versions)
A13 TWC — 2 ms Erase/Write mode
(93C versions)
A14 TEC — 6 ms ERAL mode, 4.5V ≤ VCC ≤ 5.5V
A15 TWL — 15 ms WRAL mode, 4.5V ≤ VCC ≤ 5.5V
A16 — Endurance 1M — cycles 25°C, VCC = 5.0V, (Note 2)
Note 1: This parameter is periodically sampled and not 100% tested.
2: This application is not tested but ensured by characterization. For endurance estimates in a specific
application, please consult the Total Endurance™ Model, which may be obtained from Microchip’s web
site at www.microchip.com.
© 2008 Microchip Technology Inc. DS21795D-page 5
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
FIGURE 1-1: SYNCHRONOUS DAT A T IMING
TABLE 1-3: INSTRUCTION SET FOR X16 ORGANIZATION (93XX66B OR 93XX66C WITH ORG = 1)
TABLE 1-4: INSTRUCTION SET FOR X8 ORGANIZATION (93XX66A OR 93XX66C WITH ORG = 0)
Instruction SB Opcode Address Data In Data Out Req. CLK Cycles
ERASE 1 11 A7 A6 A5 A4 A3 A2 A1 A0 — (RDY/BSY)11
ERAL 1 00 10XXXXXX —(RDY/
BSY)11
EWDS 1 00 00XXXXXX — High-Z 11
EWEN 1 00 11XXXXXX — High-Z 11
READ 1 10 A7 A6 A5 A4 A3 A2 A1 A0 — D15 – D0 27
WRITE 1 01 A7 A6 A5 A4 A3 A2 A1 A0 D15 – D0 (RDY/BSY)27
WRAL 1 00 01XXXXXXD15 – D0 (RDY/BSY)27
Instruction SB Opcode Address Data In Data Out Req. CLK
Cycles
ERASE 1 11 A8 A7 A6 A5 A4 A3 A2 A1 A0 — (RDY/BSY)12
ERAL 1 00 10X X XX XXX — (RDY/BSY)12
EWDS 1 00 00X X XX XXX — High-Z 12
EWEN 1 00 11X X XX XXX — High-Z 12
READ 1 10 A8 A7 A6 A5 A4 A3 A2 A1 A0 — D7 – D0 20
WRITE 1 01 A8 A7 A6 A5 A4 A3 A2 A1 A0 D7 – D0 (RDY/BSY)20
WRAL 1 00 01X X XX XXX D7 – D0 (RDY/BSY)20
CS VIH
VIL
VIH
VIL
VIH
VIL
VOH
VOL
VOH
VOL
CLK
DI
DO
(Read)
DO
(Program)
TCSS
TDIS
TCKH TCKL
TDIH
TPD
TCSH
TPD
TCZ
Status Valid
TSV
TCZ
Note: TSV is relative to CS.
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
DS21795D-page 6 © 2008 Microchip Technology Inc.
2.0 FUNCTIONAL DESCRIPTION
When the ORG pin is connected to VCC, the (x16) orga-
nization is selected. When it is connected to ground,
the (x8) organization is selected. Instructions,
addresses and write data are clocked into the DI pin on
the rising edge of the clock (CLK). The DO pin is
normally held in a High-Z state except when reading
data from the device, or when checking the Ready/
Busy status during a programming operation. The
Ready/Busy status can be verified during an Erase/
Write operation by polling the DO pin; DO low indicates
that programming is still in progress, while DO high
indicates the device is ready. DO will en ter the High-Z
state on the falling edge of CS.
2.1 Start Condition
The Start bit is detected by the device if CS and DI are
both high with respect to t he positive edge of CLK for
the first time.
Before a Start condition is detected, CS, CLK and DI
may change in any combination (except to that of a
Start condition), without resulting in any device
operation (Read, Write, Erase, EWEN, EWDS, ERAL
or WRAL). As soon as CS is high, the device is no
longer in Standby mode.
An instruction following a Start condition will only be
executed if the required opcode, address and data bits
for any particular instruction are clocked in.
2.2 Data In/Data Out (DI/DO)
It is possible to connect the Data In and Data Out pins
together. Ho wever, with this configuration it is possible
for a “bus conflict” to occur during the “dummy zero”
that precedes the read operation, if A0 is a logic high
level. Under such a conditio n the voltage level seen at
Data Out is undefined and will depend upon the relative
impedances of Data Out and the signal source driving
A0. The higher the current sourcing capability of A0,
the higher the voltage at the Data Out pin. In order to
limit this current, a resistor should be connected
between DI and DO.
2.3 Data Protection
All modes of operation are inhibited when VCC is below
a typical voltage of 1.5V for ‘93AA’ and ‘93LC’ devices
or 3.8V for ‘93C’ devices.
The EWEN and EWDS commands give additional
protection against accidentally programming during
normal operation.
Note: For added protection, an EWDS command
should be performed after every write
operation.
After power-up, the device is automatically in the
EWDS mode. Therefore, an EWEN instruction must be
performed before the initial ERASE or WRITE instruction
can be executed.
Block Diagram
Note: When preparing to transmit an instruction,
either the CLK or DI signal le vels must b e
at a logic low as CS is toggled active high.
Memory
Array
Data Register
Mode
Decode
Logic
Clock
Register
Address
Decoder
Address
Counter
Output
Buffer DO
DI
ORG*
CS
CLK
VCC VSS
*ORG input is not available on A/B devices
© 2008 Microchip Technology Inc. DS21795D-page 7
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
2.4 Erase
The ERASE in struction forces all d ata bits of the speci-
fied address to the log ical ‘1’ state. CS is brough t low
following the loading of the last address bit. This falling
edge of the CS pin initiates the self-timed program-
ming cycle, except on ‘93C’ devices where the rising
edge of CLK before the last address bit initiates the
write cycle.
The DO pin indicates the Ready/Busy status of the
device if CS is brought hig h after a minimum of 250 ns
low (TCSL). DO at logical ‘0’ indicates that programming
is still in progress. DO at logical ‘1’ indicates that the
register at the speci fied address h as been erased and
the device is ready for another instruction.
Note: Issuing a Start bit and then taking CS low
will clear the Ready/Busy status from DO.
FIGURE 2-1: ERASE TI MING FOR 93AA AND 93LC DEVICES
FIGURE 2-2: ERASE TI MING FOR 93C DEVICES
CS
CLK
DI
DO
TCSL
Check Status
111ANAN-1 AN-2 ••• A0
TSV TCZ
Busy Ready High-Z
TWC
High-Z
CS
CLK
DI
DO
TCSL
Check Status
111ANAN-1 AN-2 ••• A0
TSV TCZ
Busy Ready High-Z
TWC
High-Z
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
DS21795D-page 8 © 2008 Microchip Technology Inc.
2.5 Erase All (ERAL)
The Erase All (ERAL) instruction will erase the entire
memory array to the logical ‘1’ state. The ERAL cycle
is identical to the erase cycle, except for the different
opcode. The ERAL cycl e is completely self-timed and
commences at the falling edge of the CS, except on
‘93C’ devices where the risi ng edge of CLK befo re the
last data bit initiates the write cycle. Clocking of the
CLK pin is not necessary after the device has entered
the ERAL cycle.
The DO pin indicates the Ready/Busy status of the
device, if CS is brought high after a minimum of 250 ns
low (TCSL).
Note: Issuing a Start bit and then taking CS low
will clear the Ready/Busy status from DO.
VCC must be ≥ 4.5V for proper operati on of ERAL.
FIGURE 2-3: ERAL TIMING FOR 93AA AND 93LC DEVICES
FIGURE 2-4: ERAL TIMING FOR 93C DEVICES
CS
CLK
DI
DO
TCSL
Check Status
10010x
••• x
TSV TCZ
Busy Ready High-Z
TEC
High-Z
VCC must be ≥4.5V for proper operation of ERAL.
CS
CLK
DI
DO
TCSL
Check Status
10010x
••• x
TSV TCZ
Busy Ready High-Z
TEC
High-Z
© 2008 Microchip Technology Inc. DS21795D-page 9
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
2.6 Erase/Write Disable and Enable
(EWDS/EWEN)
The 93XX66A/B/C powers up in the Erase/Write
Disable (EWDS) state. All Programming modes must be
preceded by an Erase/Write Enable (EWEN) instruction.
Once the EWEN instruction is executed, programming
remains enabled unti l an EWDS instruction is executed
or Vcc is removed from the device.
To protect against accidental data disturbance, the
EWDS instruction can be used to d isabl e all erase/write
functions and should follow all programming opera-
tions. Execution of a READ instruction is independent of
both the EWEN and EWDS instructions.
FIGURE 2-5: EWDS TIMING
FIGURE 2-6: EWEN TIMING
2.7 Read
The READ instruction outputs the serial data of the
addressed memory location on the DO pin. A dummy
zero bit precedes the 8-bit (If ORG pin is low or A-V ersion
devices) or 16-bit (If ORG pin is high or B-version
devices) output string. The output data bits will toggle on
the rising edge of the CLK and are stable after the
specified time delay (TPD). Sequential read is possible
when CS is held high. The memory data will
automatically cycle to the next register and output
sequentially.
FIGURE 2-7: READ TIMING
CS
CLK
DI 10
000x ••• x
TCSL
1x
CS
CLK
DI 00 1 1x
TCSL
•••
CS
CLK
DI
DO
110
An ••• A0
High-Z 0Dx ••• D0 Dx ••• D0 •••
Dx D0
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
DS21795D-page 10 © 2008 Microchip Technology Inc.
2.8 Write
The WRITE instruction is followed by 8 bits (If ORG is
low or A-version devices) or 16 bits (If ORG pin is high
or B-version devi ces) of data which are written i nto the
specified address. For 93AA66A/B/C and 93LC66A/B/C
devices, after the last data bit is clocked into DI, the
falling edge of CS initiates the self-timed auto-erase and
programming cyc le. For 93 C66A/B/C devices, th e self-
timed auto-erase and programming cycle is i nitiated by
the rising edge of CLK on the last dat a bi t.
The DO pin indicates the Ready/Busy status of the
device, if CS is brought high after a minimum of 250 ns
low (TCSL). DO at logical ‘0’ indicates that programming
is still in progress. DO at logical ‘1’ indicates that the
register at the specifi ed address has been w ritten with
the data specified and the device is ready for another
instruction.
Note: Issuing a Start bit and then taking CS low
will clear the Ready/Busy status from DO.
FIGURE 2-8: WRITE T IMING FOR 93AA AND 93LC DEVICES
FIGURE 2-9: WRITE T IMING FOR 93C DEVICES
CS
CLK
DI
DO
101AN••• A0 Dx ••• D0
Busy Ready High-Z
High-Z
TWC
TCSL
TCZ
TSV
CS
CLK
DI
DO
101AN••• A0 Dx ••• D0
Busy Ready High-Z
High-Z
TWC
TCSL
TCZ
TSV
© 2008 Microchip Technology Inc. DS21795D-page 11
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
2.9 Write All (WRAL)
The Write All (WRAL) instruction will write the entire
memory array with the data specified in the comma nd.
For 93AA66A/B/C and 93LC66A/B/C devices, after the
last data bit is clocked into DI, the falling edge of CS
initiates the self-timed auto-erase and programming
cycle. For 93C66A/B/C devices, the self-timed auto-
erase and programming cycle is initiated by the rising
edge of CLK on the last data bit. Clocking of the CLK
pin is not necessary after the device has entered the
WRAL cycle. The WRAL command does include an
automatic ERAL cycle for the device. Therefore, the
WRAL instruction does not require an ERAL instruction,
but the chip must be in the EWEN status.
The DO pin indicates the Ready/Busy status of the
device if CS is brought hig h after a minimum of 250 ns
low (TCSL).
Note: Issuing a Start bit and then taking CS low
will clear the Ready/Busy status from DO.
VCC must be ≥ 4.5V for proper operati on of WRAL.
FIGURE 2-10: WRAL TI MING FOR 93AA AND 93LC DEVICES
FIGURE 2-11: WRAL TIMING FOR 93C DEVICE S
CS
CLK
DI
DO HIGH-Z
10001x
••• xDx ••• D0
High-Z Busy Ready
TWL
VCC must be ≥4.5V for proper operation of WRAL.
TCSL
TSV TCZ
CS
CLK
DI
DO HIGH-Z
10001x
••• xDx ••• D0
High-Z Busy Ready
TWL
TCSL
TSV TCZ
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
DS21795D-page 12 © 2008 Microchip Technology Inc.
3.0 PIN DESCRIPTIONS
TABLE 3-1: PIN DESCRIPTIONS
3.1 Chip Select (CS)
A high level selects the device; a low level deselects
the device and forces it into St andby mode. However , a
programming cycle which is already in progress will be
completed, regardless of the Chip Select (CS) input
signal. If CS is brought low during a program cycle, the
device will go into Standby mode as soon as the
programming cycle is completed.
CS must be low for 250 ns minimum (TCSL) between
consecutive instructions. If CS is low, the internal
control logic is held in a Reset status.
3.2 Serial Clock (CLK)
The Serial Clock is used to synchronize the communi-
cation between a master device and the 93XX series
device. Opcodes, address an d data bits are clocked in
on the positive edge of CLK. Data bits are also clocked
out on the positive edge of CLK.
CLK can be stopped anywhere in the transmission
sequence (at high or low level) and can be continued
anytime with respect to Clock High Time (TCKH) and
Clock Low Time (TCKL). This gives the controlling
master freedom in preparing opcode, address and
data.
CLK is a “don’t care” if CS is low (device deselected). If
CS is high, but the Start condition has not been
detected (DI = 0), any number of clock cycles can be
received by the device without changing its status (i.e.,
waiting for a Start condition).
CLK cycles are not required during the self-timed write
(i.e., auto erase/write) cycle.
After detection of a S tart condition the specified number
of clock cycles (respectively low-to-high transitions of
CLK) must be provided. These clock cycles are
required to clock in all required opcode, address and
data bits before an instruction is executed. CLK and DI
then become “don’t care” inputs waiting for a new Start
condition to be detected.
3.3 Data In (DI)
Data In (DI) is used to clock in a Start bit, opcode,
address and data synchronously with the CLK input.
3.4 Data Out (DO)
Data Out (DO) is used in the Read mode to output data
synchronously with the CLK input (TPD after the posi-
tive edge of CLK).
This pin also provides Ready/Busy status information
during erase and write cycles. Ready/Busy status infor-
mation is available on the DO pin if CS is brought high
after being low for minimum Chip Select Low Time
(TCSL) and an erase or write operation has been
initiated.
The Status signal is not avai lable on DO, if CS is he ld
low during the entire erase or write cycle. In this case,
DO is in the High-Z mode. If status is checked after the
erase/write cycle, the data line will be high to indicate
the device is ready.
Note: Issuing a Start bit and then taking CS low
will clear the Ready/Busy status from DO.
3.5 Organization (ORG)
When the ORG pin is connected to VCC or Logic HI, the
(x16) memory organization is selected. When the ORG
pin is tied to VSS or Logic LO, the (x8) memory
organization is selected. For proper operation, ORG
must be tied to a valid logic level.
93XX66A devices are always (x8) organization and
93XX66B devices are always (x16) organization.
Name SOIC/PDIP/
MSOP/TSSOP/
DFN SOT-23 Rotated SOIC Function
CS 1 5 3 Chip Select
CLK 2 4 4 Serial Clock
DI 3 3 5 Data In
DO 4 1 6 Data Out
VSS 5 2 7 Ground
ORG/NC 6 N/A 8 Organization / 93XX66C
No Internal Connection / 93XX66A/B
NC 7 N/A 1 No Internal Connection
VCC 8 6 2 Power Supply
© 2008 Microchip Technology Inc. DS21795D-page 13
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
4.0 PACKAGING INFORMATION
4.1 Package Marking Information
Example:
6-Lead SOT-23
8-Lead MSOP (150 mil) Example:
XXXXXXT
YWWNNN 3L66BI
5281L7
XXNN 3EL7
T/XXXNNN
XXXXXXXX
YYWW
8-Lead PDIP
8-Lead SOIC
XXXXYYWW
XXXXXXXT
NNN
XXXX
TYWW
8-Lead TSSOP
NNN
I/P 1L7
93LC66B
0528
Example:
Example:
SN 0528
93LC66BI
1L7
1L7
L66B
I528
Example:
3
e
3
e
8-Lead 2x3 DFN Example:
374
528
L7
XXX
YWW
NN
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
DS21795D-page 14 © 2008 Microchip Technology Inc.
Note: T = Temperature grade (I, E)
NN = Alphanumeric traceability code
Part Number 1st Line Marking Codes
TSSOP MSOP SOT-23 DFN
I Temp. E Temp. I Temp. E Temp.
93AA66A A66A 3A66AT 3BNN — 361 —
93AA66B A66B 3A66BT 3LNN — 371 —
93AA66C A66C 3A66CT — — 381 —
93LC66A L66A 3L66AT 3ENN 3FNN 364 365
93LC66B L66B 3L66BT 3PNN 3RNN 374 375
93LC66C L66C 3L66CT — — 384 385
93C66A C66A 3C66AT 3HNN 3JNN 367 368
93C66B C66B 3C66BT 3TNN 3UNN 377 378
93C66C C66C 3C66CT — — 387 388
Legend: XX...X Part number or part number code
T Temperature (I, E)
Y Year code (last digit of calendar year)
YY Year code (last 2 digi ts of calendar year)
WW Week code (week of January 1 is week ‘01’)
NNN Alphanumeric traceability code (2 charac ters for small packages)
Pb-free JEDEC designator for Matte Tin (Sn)
Note: For very small packages with no room for the Pb-free JEDEC designator
, the marking will only appear on the oute r carton or reel label.
Note: In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line, thus limiting the number of available
characters for customer-specific information.
3
e
3
e
© 2008 Microchip Technology Inc. DS21795D-page 15
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
!"#$%!&'(!%&! %(%")%%%"
& "*"%!"&"$ %! "$ %! %#"+&& "
, & "%*-+
./0 . & %#%! ))%!%%
*10 $& '! !)%!%%'$$&%!
1%& %!%2") ' %2$%%"%
%%033)))&&32
4% 55**
& 5&% 6 67 8
6!&($ 6 9
% :+./
7;% < <
""22 + 9+ +
%"$$ < +
7="% * ./
""2="% * ,./
75% ,./
1%5% 5 : 9
1%% 5 +*1
1% > < 9>
5"2 9 < ,
5"="% ( <
D
N
E
E1
NOTE 1
12
e
b
A
A1
A2
c
L1 L
φ
) /.
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
DS21795D-page 16 © 2008 Microchip Technology Inc.
!"
& "*"%!"&"$ %! "$ %! %#"&& "
& "%*-+
./0 . & %#%! ))%!%%
1%& %!%2") ' %2$%%"%
%%033)))&&32
4% 55**
& 5&% 6 67 8
6!&($ 6 :
% +./
7!% "5"% ./
7;% < +
""22 9 < ,
%"$$ < +
7="% * < ,
""2="% * , < 9
75% < ,
1%5% 5 < :
1%% 5 ,+ < 9
1% > < ,>
5"2 9 < :
5"="% ( < +
b
E
4
N
E1
PIN1IDBY
LASER MARK
D
123
e
e1
A
A1
A2 c
L
L1
φ
) /9.
© 2008 Microchip Technology Inc. DS21795D-page 17
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
#$%"&&'(#$
!"#$%!&'(!%&! %(%")%%%"
?$%/% %
, & "*"%!"&"$ %! "$ %! %#"@ "
& "%*-+
./0. & %#%! ))%!%%
1%& %!%2") ' %2$%%"%
%%033)))&&32
4% 6/;*
& 5&% 6 67 8
6!&($ 6 9
% ./
%% < <
""22 + , +
. %% + < <
!"%!"="% * , ,+
""2="% * + 9
75% ,9 ,:+
%% 5 + , +
5"2 9 +
45"="% ( :
5)5"="% ( 9
7)? . < < ,
N
E1
NOTE 1
D
12
3
A
A1
A2
L
b1
b
e
E
eB
c
) /9.
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
DS21795D-page 18 © 2008 Microchip Technology Inc.
%)*"+,&'($-
!"#$%!&'(!%&! %(%")%%%"
?$%/% %
, & "*"%!"&"$ %! "$ %! %#"+&& "
& "%*-+
./0 . & %#%! ))%!%%
*10 $& '! !)%!%%'$$&%!
1%& %!%2") ' %2$%%"%
%%033)))&&32
4% 55**
& 5&% 6 67 8
6!&($ 6 9
% ./
7;% < < +
""22 + < <
%"$$
?
< +
7="% * :./
""2="% * ,./
75% ./
/&$A%B + < +
1%5% 5 <
1%% 5 *1
1% I> < 9>
5"2 < +
5"="% ( , < +
"$% D+> < +>
"$%.%%& E+> < +>
D
N
e
E
E1
NOTE 1
12 3
b
A
A1
A2
L
L1
c
h
h
φ
β
α
) /+.
© 2008 Microchip Technology Inc. DS21795D-page 19
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
%)*"+,&'($-
1%& %!%2") ' %2$%%"%
%%033)))&&32
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
DS21795D-page 20 © 2008 Microchip Technology Inc.
.. %/+/'(
!"#$%!&'(!%&! %(%")%%%"
& "*"%!"&"$ %! "$ %! %#"+&& "
, & "%*-+
./0 . & %#%! ))%!%%
*10 $& '! !)%!%%'$$&%!
1%& %!%2") ' %2$%%"%
%%033)))&&32
4% 55**
& 5&% 6 67 8
6!&($ 6 9
% :+./
7;% < <
""22 9 +
%"$$ + < +
7="% * :./
""2="% * , +
""25% , ,
1%5% 5 + : +
1%% 5 *1
1% I> < 9>
5"2 <
5"="% ( < ,
D
N
E
E1
NOTE 1
12
b
e
c
A
A1
A2
L1 L
φ
) /9:.
© 2008 Microchip Technology Inc. DS21795D-page 21
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
#0*-%!1"1&+,'(#0
!"#$%!&'(!%&! %(%")%%%"
2&&# "%( %"
, 2 ) !%"
& "%*-+
./0 . & %#%! ))%!%%
*10 $& '! !)%!%%'$$&%!
1%& %!%2") ' %2$%%"%
%%033)))&&32
4% 55**
& 5&% 6 67 8
6!&($ 6 9
% +./
7;% 9
%"$$ +
/%%2 , *1
75% ./
7="% * ,./
*# ""5% , < ++
*# ""="% * + < +
/%%="% ( + ,
/%%5% 5 , +
/%%%*# "" C < <
D
N
E
NOTE 1
12
EXPOSED PAD
NOTE 1
21
D2
K
L
E2
N
e
b
A3 A1
A
NOTE 2
BOTTOM VIEW
TOP VIEW
) /,/
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
DS21795D-page 22 © 2008 Microchip Technology Inc.
#0*-%!1"1&+,'(#0
1%& %!%2") ' %2$%%"%
%%033)))&&32
© 2008 Microchip Technology Inc. DS21795D-page 23
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
APPENDIX A: REVISION HISTORY
Revision B
Corrections to Section 1.0, Electrical Characteristics.
Section 4.1, 6-Lead SOT-23 package to OT.
Revision C
Added DFN package.
Revision D (5/2008)
Revised Figures 2-1 through 2-4 and Figures 2-8
through 2-11; Revised Package Marking Information;
Replaced Package Drawings; Revised Product ID
section.
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
DS21795D-page 24 © 2008 Microchip Technology Inc.
NOTES:
© 2008 Microchip Technology Inc. DS21795D-page 25
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
THE MICROCHIP WEB SITE
Microchip provides online support via our WWW site at
www.microchip.com. This web site is used as a means
to make files and information easily available to
customers. Accessible by using your favorite Internet
browser, the web site contains the following
information:
•Product Support – Data s heets and errata,
application notes and sample programs, design
resources, user’s guides and hardware support
documents, latest software releases and archived
software
•General Technical Support – Frequently Asked
Questions (FAQ), technical support reque sts,
online discussion groups, Microchip co nsultant
program member listing
•Business of Mic r oc hi p – Product selector and
ordering guides, latest Microchip press relea se s ,
listing of seminars and events, listings of
Microchip sales offices, distributors and factory
representatives
CUSTOMER CHANGE NOTIFICATION
SERVICE
Microchip’s customer notification service helps keep
customers current on Microchip products. Subscribers
will receive e-mail notification whenever there are
changes, updates, revisions or errata related to a
specified product family or development tool of interest.
To register, access the Microchip web site at
www.microchip.com, click on Customer Change
Notification and follow the registration instructions.
CUSTOMER SUPPORT
Users of Microchip products can receive assistance
through several channels:
• Distributor or Representative
• Local Sales Office
• Field Application Engineer (FAE)
• Technical Support
• Development Systems Information Line
Customers should contact their distributor,
representative or field application engineer (FAE) for
support. Local sales offices are also available to help
customers. A listing of sales offices and locations is
included in the back of this docume nt.
Technical support is available through the web site
at: http://support.microchip.com
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
DS21795D-page 26 © 2008 Microchip Technology Inc.
READER RESPONSE
It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip prod-
uct. If you wish to provide your comments on organization, clarity, subject matter , and ways in which our document ation
can better serve you, please FAX your comments to the Technical Publications Manager at (480) 792-4150.
Please list the following info rmation, and use this outline to pro v ide us with your comments about this document.
To: Technical Publications Manager
RE: Reader Response Total Pages Sent ________
From: Name
Company
Address
City / State / ZIP / Country
Telephone: (_______) _________ - ____ _____
Application (optional):
Would you like a reply? Y N
Device: Literature Number:
Questions:
FAX: (______) _________ - _________
DS21795D93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
1. What are the best features of this document?
2. H ow does this document meet your hardware and software development needs?
3. Do you find the organization of this document easy to follow? If not, why?
4. What additions to the document do you think would enhance the structure and subject?
5. What deletions from the document could be made without affecting the overall usefulness?
6. Is th ere any incorrect or misleading information (what and where)?
7. H ow would you improve this document?
© 2008 Microchip Technology Inc. DS21795D-page 27
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
Device: 93AA66A: 4K 1.8V Micr owire Serial EEPROM
93AA66B: 4K 1.8V Microwire Serial EEPROM
93AA66C: 4K 1.8V Microwire Serial EEPROM w/ORG
93LC66A: 4K 2.5V Microwire Serial EEPROM
93LC66B: 4K 2.5V Microwire Serial EEPROM
93LC66C: 4K 2.5V Microwire Serial EEPROM w/ORG
93C66A: 4K 5.0V Microwire Serial EEPROM
93C66B: 4K 5.0V Microwire Serial EEPROM
93C66C: 4K 5.0V Microwire Serial EEPROM w/ORG
Pinout: Blank = Standard pinout
X = Rotated pinout
Tape & Reel: Blank = Standard packaging
T = Tape & Reel
Temperature Range: I = -40°C to +85°C
E = -40°C to +125°C
Package: MS = Plastic MSOP (Micro Small outline, 8-lead)
OT = SOT-23, 6-lead (Tape & Reel only)
P = Plastic DIP (300 mil body), 8-lead
SN = Plastic SOIC (150 mil body), 8-lead
ST = TSSOP, 8-lead
MC = 2x3 DFN, 8-lead
Examples:
a) 93AA66C-I/MS: 4K, 512x8 or 256x16 Serial
EEPROM, MSOP package, 1.8V
b) 93AA66B-I/MS: 4K, 256x16 Serial EEPROM,
MSOP package, 1.8V
c) 93AA66AT-I/OT: 4K, 512x8 Serial EEPROM,
SOT-23 package, tape and reel, 1.8V
d) 93AA66CT-I/MS: 4K, 512x8 or 256x16 Serial
EEPROM, MSOP pa ckage, tape and reel, 1. 8V
a) 93LC66A-I/MS: 4K, 512x8 Serial EEPROM,
MSOP package, 2.5V
b) 93LC66BT-I/OT: 4K, 256x16 Serial EEPROM,
SOT-23 package, tape and reel, 2.5V
c) 93LC66B-I/MS: 4K, 256x16 Serial EEPROM,
MSOP package, 2.5V
a) 93C66B-I/MS: 4K, 256x16 Serial EEPROM,
MSOP package, 5.0V
b) 93C66C-I/MS: 4K, 512x8 or 256x16 Serial
EEPROM, MSOP package, 5.0V
c) 93C66AT-I/OT: 4K, 512x8 Serial EEPROM,
SOT-23 package, tape and reel, 5.0V
PART NO. X/XX
Package
Temperature
Range
Device
X
Lead Finish
X
Tape & Reel
X
Pinout
93AA66A/B/C, 93LC66A/B/C, 93C66A/B/C
DS21795D-page 28 © 2008 Microchip Technology Inc.
NOTES:
© 2008 Microchip Technology Inc. DS21795D-page 29
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defen d, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, KEELOQ logo, MPLAB, PIC, PICmicro,
PICST ART, PRO MA TE, rfPIC and SmartShunt are registered
trademarks of Microchip Technology Incorporated in the
U.S.A. and other countries.
FilterLab, Linear Active Thermistor, MXDEV, MXLAB,
SEEV AL, SmartSensor and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, dsSPEAK, ECAN,
ECONOMONITOR, FanSense, In-Circuit Serial
Programming, ICSP, ICEPIC, Mindi, MiWi, MPASM, MPLAB
Certified logo, MPLIB, MPLINK, mTouch, PICkit, PICDEM,
PICDEM.net, PICtail, PIC32 logo, PowerCal, PowerInfo,
PowerMate, PowerTool, REAL ICE, rfLAB, Select Mode, T ot al
Endurance, UNI/O, WiperLock and ZENA are trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
SQTP is a service mark of Microchip T echnology Incorporated
in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2008, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Note the following details of the code protection feature on Microchip devices:
• Microchip products meet the specification contained in their particular Microchip Data Sheet.
• Microchip believes that its family of product s is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
• There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Dat a
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
• Microchip is willing to work with the customer who is concerned about the integrity of their code.
• Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection featur es of our
products. Attempts to break Microchip’ s code protection feature may be a violation of the Digit al Millennium Copyright Act. If such acts
allow unauthorized access to you r software or other copyrighted work, you may have a right to sue for relief under that Act.
Microchip received ISO/TS-16949:200 2 certif ication for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona; Gresham, Oregon and design centers in California
and India. The Company’s quality system processes and procedures
are for its PIC® MCUs and dsPIC® DSCs, KEELOQ® code hopping
devices, Serial EEPROMs, microperi pherals, nonvola tile memo ry and
analog product s. In addition, Microchip ’s quality system for the design
and manufacture of development systems is ISO 9001:2000 certified.
DS21795D-page 30 © 2008 Microchip Technology Inc.
AMERICAS
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01/02/08
