_______________General Description
The MAX308/MAX309 precision, monolithic, CMOS ana-
log multiplexers (muxes) offer low on-resistance (less
than 100Ω), which is matched to within 5Ωbetween
channels and remains flat over the specified analog sig-
nal range (7Ωmax). They also offer low leakage over
temperature (NO-off leakage current less than 5nA at
+85°C) and fast switching speeds (transition time less
than 250ns). The MAX308 is a single-ended 1-of-8
device, and the MAX309 is a differential 2-of-4 device.
The MAX308/MAX309 are fabricated with Maxim’s
improved 44V silicon-gate process. Design improve-
ments yield extremely low charge injection (less than
10pC) and guarantee electrostatic discharge protection
greater than 2000V.
These muxes operate with a single +5V to +30V supply
or bipolar ±5V to ±20V supplies, while retaining
TTL/CMOS-logic input compatibility and fast switching.
CMOS inputs provide reduced input loading. These
improved parts are plug-in upgrades for the industry-
standard DG408, DG409, DG508A, and DG509A.
________________________Applications
Sample-and-Hold Circuits
Automatic Test Equipment
Heads-Up Displays
Guidance and Control Systems
Military Radios
Communications Systems
Battery-Operated Systems
PBX, PABX
Audio Signal Routing
____________________________Features
♦Guaranteed On-Resistance Match Between
Channels, <5ΩMax
♦Low On-Resistance, <100ΩMax
♦Guaranteed Flat On-Resistance over Specified
Signal Range, 7ΩMax
♦Guarateed Low Charge Injection, <10pC
♦NO-Off Leakage Current <5nA at +85°C
♦COM-Off Leakage Current <20nA at +85°C
♦ESD Protection >2000V
♦Plug-In Upgrade for Industry-Standard
DG408/DG409/DG508A/DG509A
♦Single-Supply Operation (+5V to +30V)
Bipolar-Supply Operation (±5V to ±20V)
♦Low Power Consumption, <300µW
♦Rail-to-Rail Signal Handling
♦TTL/CMOS-Logic Compatible
______________Ordering Information
MAX308/MAX309
Precision, 8-Channel/Dual 4-Channel,
High-Performance, CMOS Analog Multiplexers
________________________________________________________________ Maxim Integrated Products 1
CMOS DECODE LOGIC
A2 A1 A0 EN
NO8
NO7
NO6
NO5
NO4
NO3
NO2
NO1
COM
V+ V- GND
MAX308 8-CHANNEL SINGLE-ENDED MULTIPLEXER
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
A1
A2
GND
V+
NO1
V-
EN
A0
TOP VIEW
MAX308
NO5
NO6
NO7
NO8
COM
NO4
NO3
NO2
DIP/SO/TSSOP
Continued at end of data sheet.
_____________________Pin Configurations/Functional Diagrams/Truth Tables
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
19-0271; Rev 2; 8/02
PART
MAX308CPE
MAX308CSE
MAX308C/D 0°C to +70°C
0°C to +70°C
0°C to +70°C
TEMP RANGE PIN-PACKAGE
16 Plastic DIP
16 Narrow SO
Dice*
Ordering Information continued at end of data sheet.
*Contact factory for dice specifications.
**Contact factory for availability.
MAX308EPE -40°C to +85°C 16 Plastic DIP
MAX308ESE -40°C to +85°C 16 Narrow SO
MAX308EJE -40°C to +85°C 16 CERDIP
MAX308MJE -55°C to +125°C 16 CERDIP**
MAX308CUE 0°C to +70°C 16 TSSOP
MAX308EUE -40°C to +85°C 16 TSSOP
MAX308/MAX309
Precision, 8-Channel/Dual 4-Channel,
High-Performance, CMOS Analog Multiplexers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—Dual Supplies
(V+ = +15V, V- = -15V, GND = 0V, VAH = +2.4V, VAL = +0.8V, TA= TMIN to TMAX, unless otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Voltage Referenced to V-
V+ ............................................................................-0.3V, 44V
GND .........................................................................-0.3V, 25V
Digital Inputs, NO, COM (Note 1)...........(V- - 2V) to (V+ + 2V) or
30mA, (whichever occurs first)
Continuous Current (any terminal) ......................................30mA
Peak Current, NO or COM
(pulsed at 1ms, 10% duty cycle max) ..........................100mA
Continuous Power Dissipation (TA= +70°C)
Plastic DIP (derate 10.53mW/°C above +70°C) ..........842mW
Narrow SO (derate 8.70mW/°C above +70°C) ............696mW
CERDIP (derate 10.00mW/°C above +70°C)...............800mW
TSSOP (derate 6.7mW/°C above +70°C) ....................457mW
Operating Temperature Ranges
MAX30_C_ _ .......................................................0°C to +70°C
MAX30_E_ _.....................................................-40°C to +85°C
MAX30_MJE ..................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
VCOM = ±10V,
VNO = ±10V,
sequence
each switch
on
VNO = +10V,
VCOM = ±10V,
VEN = 0V
VCOM = +10V,
VNO = ±10V,
VEN = 0V
INO = -1.0mA,
VCOM = ±10V
INO = -1.0mA,
VCOM = ±10V (Note 4)
VNO = ±10V,
VCOM = +10V,
VEN = 0V
CONDITIONS
nA
-10 10
ICOM(ON)
COM-On Leakage Current
(Note 5)
-5 5
-0.75 0.02 0.75
-20 20
-10 10
-0.75 0.02 0.75
nA
-10 10
ICOM(OFF)
COM-Off Leakage Current
(Note 5)
-5 5
-0.75 0.02 0.75
-20 20
60 100
-10 10
-0.75 0.02 0.75
nA
-5.0 5.0
INO(OFF)
NO-Off Leakage Current
(Note 5) -2.5 2.5
Ω
125
RON
On-Resistance
1.5 5 Ω
8
∆RON
On-Resistance Matching
Between Channels
UNITS
MIN TYP MAX
(Note 2)
SYMBOLPARAMETER
Note 1: Signals on NO, COM, EN, A0, A1, or A2 exceeding V+ or V- are clamped by internal diodes. Limit forward current to
maximum current ratings.
V-15 15
VNO,
VCOM
Analog Signal Range
INO = -1.0mA,
VCOM = ±5V or 0V
1.8 7 Ω
10
RFLAT
On-Resistance Flatness
(Note 3)
TA= +25°C
TA= TMIN to TMAX
TA= +25°C
TA= TMIN to TMAX
TA= +25°C
TA= TMIN to TMAX
-0.5 0.01 0.5TA= +25°C
TA= TMIN
to TMAX
TA= +25°C
TA= TMIN
to TMAX
TA= +25°C
TA= TMIN
to TMAX
TA= +25°C
TA= TMIN
to TMAX
TA= +25°C
TA= TMIN
to TMAX
MAX309
MAX308
MAX309
MAX308
C, E
M
C, E
M
C, E
M
C, E
M
C, E
M
SWITCH
MAX308/MAX309
Precision, 8-Channel/Dual 4-Channel,
High-Performance, CMOS Analog Multiplexers
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS—Dual Supplies (continued)
(V+ = +15V, V- = -15V, GND = 0V, VAH = +2.4V, VAL = +0.8V, TA= TMIN to TMAX, unless otherwise noted.)
Off Isolation
(Note 6) dB-75VISO
210
Q
Charge Injection
(Note 3)
ns
300
150tOFF(EN)
Enable Turn-Off Time
ns
225
tON(EN)
Enable Turn-On Time 85 150
ns10 40tOPEN
Break-Before-Make Interval
85 175
µA-1.0 1.0IAL
Input Current with
Input Voltage Low
µA-1.0 1.0IAH
Input Current with
Input Voltage High
µA
-10 10
I-Negative Supply Current -1 1
mA
I+Positive Supply Current 0.075 0.5
V±5 ±20Power-Supply Range
16 30 µA
75
UNITS
MIN TYP MAX
(Note 2)
SYMBOLPARAMETER
Crosstalk Between Channels VCT -92 dB
Logic Input Capacitance CIN 8pF
NO-Off Capacitance CNO(OFF) 3pF
26
COM-Off Capacitance CCOM(OFF)
f = 1MHz,
VEN = 0.8V
VCOM = 0V,
Figure 8 14
pF
37
COM-On Capacitance CCOM(ON)
f = 1MHz,
VEN = 2.4V
VCOM = 0V,
Figure 8 25
pF
TA= +25°C
VEN = 0V or 2.4V,
VA= 0V
TA= +25°C
VA= 2.4V or 15V
TA= TMIN to TMAX
TA= +25°C
TA= TMIN to TMAX
TA= TMIN to TMAX
TA= +25°C
TA= +25°C
TA= +25°C
TA= TMIN to TMAX
TA= +25°C
TA= +25°C
TA= +25°C
TA= TMIN to TMAX
CONDITIONS
TA= +25°C
TA= +25°C
TA= +25°C
TA= +25°C
TA= +25°C
VEN = 0V,
RL= 1kΩ,
f = 100kHz, Figure 6
CL= 1.0nF,
VNO = 0V,
RS= 0Ω, Figure 5
Figure 3
Figure 3
VEN = 2.4V,
VA(ALL) = 0V or 2.4V
Figure 4
VEN = 2.4V,
VA(ALL) = 0V or 2.4V
VEN = VA= 0V or 4.5V
VEN = 2.4V,
f = 100kHz,
VGEN = 1VP-P,
RL= 1kΩ, Figure 7
f = 1MHz
f = 1MHz,
VEN = VNO = 0V,
Figure 8
MAX308
MAX309
MAX308
MAX309
ns
250
tTRANS
Transistion Time TA= TMIN to TMAX
Figure 2
INPUT
SUPPLY
DYNAMIC
pC
MAX308/MAX309
Precision, 8-Channel/Dual 4-Channel,
High-Performance, CMOS Analog Multiplexers
4 _______________________________________________________________________________________
(Note 3)
CONDITIONS
CL= 1.0nF,
VNO = 0V,
RS= 0Ω
VINH = 2.4V,
VINL = 0V,
VNO1 = 5V,
Figure 3
VINH = 2.4V,
VINL = 0V,
VNO1 = 5V,
Figure 3
VNO1 = 8V,
VNO8 = 0V,
VIN = 2.4V,
Figure 2
INO = -1.0mA
VCOM = 3V or 10V
pC210Q
Charge Injection
(Note 3)
ns75 300tOFF(EN)
Enable Turn-Off Time
(Note 3)
V012
VNO,
VCOM
Analog Signal Range
ns100 600tON(EN)
Enable Turn-On Time
(Note 3)
ns115 450tTRANS
Transition Time
(Note 3)
Ω120 175RON
On-Resistance
UNITS
MIN TYP MAX
(Note 2)
SYMBOLPARAMETER
ELECTRICAL CHARACTERISTICS—Single Supply
(V+ = +12V, V- = 0V, GND = 0V, VAH = +2.4V, VAL = +0.8V, TA= TMIN to TMAX, unless otherwise noted.)
Note 2: The algebraic convention where the most negative value is a minimum and the most positive value a maximum is used in
this data sheet.
Note 3: Guaranteed by design.
Note 4: ∆RON = RON(MAX) - RON(MIN).On-resistance match between channels and flatness are guaranteed only with specified
voltages. Flatness is defined as the difference between the maximum and minimum value of on-resistance as measured at
the extremes of the specified analog signal range.
Note 5: Leakage parameters are 100% tested at the maximum rated hot temperature and guaranteed by correlation at +25°C.
Note 6: Off isolation = 20log VCOM/VNO, where VCOM = output and VNO = input to off switch.
TA= +25°C
TA= +25°C
TA= +25°C
TA= +25°C
TA= +25°C
SWITCH
DYNAMIC
MAX308/MAX309
Precision, 8-Channel/Dual 4-Channel,
High-Performance, CMOS Analog Multiplexers
_______________________________________________________________________________________ 5
120
140
160
ON-RESISTANCE vs. VCOM
(DUAL SUPPLIES)
100
MAX308/9 TOC-01
0
20
40
60
-20 20-15 15-10 10-5 50
80
V
COM
(
V
)
±5V
±10V
±15V
±20V
RON (Ω)
120
ON-RESISTANCE vs. VCOM AND
TEMPERATURE (DUAL SUPPLIES)
100
MAX308/9 TOC-02
0
20
40
60
-15 15-10 10-5 50
80
VCOM (V)
+125°C
+85°C
+25°C
-55°C
RON (Ω)
V+ = +15V
V- = -15V
280
320
360
400
ON-RESISTANCE vs. VCOM
(SINGLE SUPPLY)
240
MAX308/9 TOC-03
40
80
120
160
15 201050
200
VCOM (V)
RON (Ω)
5V
10V
15V
20V
120
140
160
ON-RESISTANCE vs. VCOM AND
TEMPERATURE (SINGLE SUPPLY)
100
MAX308/9 TOC-04
0
20
40
60
151050
80
VCOM (V)
RON (Ω)
+125°C
+85°C
+25°C
-55°C
V+ = 15V
V- = 0V
30
CHARGE INJECTION vs. VCOM
20
MAX308/9 TOC-07
-30
-20
-10
0
-15 15-10 10-5 50
10
VCOM
(
V
)
Qj (pC)
V+ = 12V
V- = 0V
V+ = +15V
V- = -15V
10
0.0001
-55 125
OFF LEAKAGE vs. TEMPERATURE
1
MAX308/9 TOC-05
TEMPERATURE (°C)
OFF LEAKAGE (nA)
25
0.01
0.001
-35 -15 65
0.1
100
1000
45 85 105
5
INO (OFF)
ICOM (ON)
V+ = 15V
V- = -15V
10
0.0001
-55 125
ON LEAKAGE vs. TEMPERATURE
1
MAX308/9 TOC-05
TEMPERATURE (°C)
ON LEAKAGE (nA)
25
0.01
0.001
-35 -15 65
0.1
100
1000
45 85 105
5
ICOM (ON)
V+ = 15V
V- = -15V
100
0.001
-55 125
SUPPLY CURRENT vs. TEMPERATURE
10
MAX4308/9-TOC8
TEMPERATURE
(
°C
)
I+, I- (µA)
25
0.1
0.01
-35 -15 65
1
45 85 105
5
I+
I-
V+ = +15V
V- = -15V
VEN = VA = 0V, 4.5V
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
__________Applications Information
Operation with
Supply Voltages Other than 15V
Using supply voltages less than ±15V will reduce the
analog signal range. The MAX308/MAX309 switches
operate with ±5V to ±20V bipolar supplies or with a
+5V to +30V single supply. Connect V- to GND when
operating with a single supply. Both device types can
also operate with unbalanced supplies, such as +24V
and -5V. The Typical Operating Characteristics graphs
show typical on-resistance with 20V, 15V, 10V, and 5V
supplies. (Switching times increase by a factor of two
or more for operation at 5V.)
Overvoltage Protection
Proper power-supply sequencing is recommended for
all CMOS devices. Do not exceed the absolute maxi-
mum ratings, because stresses beyond the listed rat-
ings may cause permanent damage to the devices.
Always sequence V+ on first, then V-, followed by the
logic inputs, NO, or COM. If power-supply sequencing
is not possible, add two small signal diodes in series
with supply pins for overvoltage protection (Figure 1).
Adding diodes reduces the analog signal range to 1V
below V+ and 1V above V-, but does not affect the
devices’ low switch resistance and low leakage charac-
teristics. Device operation is unchanged, and the differ-
ence between V+ and V- should not exceed +44V.
MAX308/MAX309
Precision, 8-Channel/Dual 4-Channel,
High-Performance, CMOS Analog Multiplexers
6 _______________________________________________________________________________________
______________________________________________________________Pin Description
Vg
NO COM
V-
V+
Figure 1. Overvoltage Protection Using External Blocking
Diodes
PIN
MAX308 MAX309 NAME FUNCTION
1, 15, 16 A0, A2, A1 Address Inputs
—
—
A0, A1 Address Inputs
2 2 EN Enable Input
3 3 V- Negative Supply Voltage Input
4–7 —NO1–NO4 Analog Inputs—Bidirectional
—4–7 NO1A–NO4A Analog Inputs—Bidirectional
8 — COM Analog Output—Bidirectional
—8, 9 COMA, COMB Analog Outputs—Bidirectional
9–12 —NO8–NO5 Analog Inputs—Bidirectional
—10–13 NO4B–NO1B Analog Inputs—Bidirectional
13 14 V+ Positive Supply Voltage Input
14 15 GND Ground
1, 16
MAX308/MAX309
Precision, 8-Channel/Dual 4-Channel,
High-Performance, CMOS Analog Multiplexers
_______________________________________________________________________________________ 7
______________________________________________Test Circuits/Timing Diagrams
50%
tTRANS
tr < 20ns
tf < 20ns
VOUT
+3V
0V
VNO1
0V
VNO8
LOGIC
INPUT
SWITCH
OUTPUT
+15V
VOUT
-15V
GND
V+
A1
V-
A2
A0
EN
NO1
NO2-NO7
NO8
COM
±10V
+10V
50Ω
MAX308
300Ω
35pF
+15V
VOUT
-15V
GND
V+
A0
V-
A1
EN
NO1B
NO1A-NO4A
NO4B
COMB
±10V
50Ω
MAX309
300Ω35pF
90%
90%
tTRANS
ON
+10V
50%
tOFF(EN)
tr < 20ns
tf < 20ns
VOUT
+3V
0V
0V
LOGIC
INPUT
SWITCH
OUTPUT
+15V
VOUT
-15V
GND
V+
A1
V-
A0
A2
EN NO1
NO2-NO8
COM
-5V
50Ω
MAX308
1k 35pF
90%
10%
tON(EN)
+15V
VOUT
-15V
GND
V+
A1
V-
A0
EN NO1B
NO1A-NO4A
NO2B-NO4B,
COMA
COMB
-5V
50Ω
MAX309
1k 35pF
Figure 2. Transition Time
Figure 3. Enable Switching Time
MAX308/MAX309
Precision, 8-Channel/Dual 4-Channel,
High-Performance, CMOS Analog Multiplexers
8 _______________________________________________________________________________________
50%
tOPEN
tr < 20ns
tf < 20ns
VOUT
+3V
0V
LOGIC
INPUT
SWITCH
OUTPUT
+15V
VOUT
-15V
GND
V+
A0
V-
A1
A2
EN
NO1-NO8
COM
+5V
50Ω
MAX308
300Ω
35pF
80%
+2.4V
0V
∆VOUT
+3V
0V
LOGIC
INPUT
+15V
VOUT
-15V
GND
V+
A1
V-
A0
A2
EN
COM
MAX308
CL = 1000nF VOUT
NO
CHANNEL
SELECT
RS
VS
ONOFF OFF
∆VOUT IS THE MEASURED VOLTAGE DUE TO CHARGE TRANSFER
ERROR Q WHEN THE CHANNEL TURNS OFF.
Q = CL = ∆VOUT
_________________________________Test Circuits/Timing Diagrams (continued)
Figure 4. Break-Before-Make Interval
Figure 5. Charge Injection
MAX308/MAX309
Precision, 8-Channel/Dual 4-Channel,
High-Performance, CMOS Analog Multiplexers
_______________________________________________________________________________________ 9
+15V
VOUT
-15V
GND
V+
A1
V-
A0
A2
NO8
COM
MAX308
NO1
RS = 50Ω
VIN
EN
10nF
RL = 1kΩ
OFF ISOLATION = 20log VOUT
VIN
10nF
+15V
VOUT
-15V
GND
V+
A1
V-
A0
A2
NO8
COM
MAX308
NO2
RS = 50Ω
VIN
EN
10nF
RL = 1kΩ
CROSSTALK = 20log VOUT
VIN
10nF
NO1
+15V
-15V
GND
V+
A2
V-
A1
A0
NO8
MAX308
CHANNEL
SELECT
NO1
COM
EN
Meter
Impedance
Analyzer
or Equivalent
f = 1MHz
_________________________________Test Circuits/Timing Diagrams (continued)
Figure 6. Off Isolation Figure 7. Crosstalk
Figure 8. NO/COM Capacitance
MAX308/MAX309
Precision, 8-Channel/Dual 4-Channel,
High-Performance, CMOS Analog Multiplexers
10 ______________________________________________________________________________________
________Pin Configurations/Functional Diagrams/Truth Tables (continued)
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
A1
GND
V+
NO1B
NO1A
V-
EN
A0
TOP VIEW
MAX309
NO2B
NO3B
N04B
COMB
COMA
NO4A
NO3A
NO2A
DIP/SO/TSSOP CMOS DECODE LOGIC
A1 A0 EN
NO4B
NO3B
NO2B
NO1B
NO4A
NO3A
NO2A
NO1A
COMA
V+ V- GND
COMB
MAX309 4-CHANNEL DIFFERENTIAL MULTIPLEXER
A2 A1 A0 EN ON
SWITCH
X
0
0
0
0
1
1
1
1
X
0
0
1
1
0
0
1
1
X
0
1
0
1
0
1
0
1
0
1
1
1
1
1
1
1
1
None
1
2
3
4
5
6
7
8
MAX308
LOGIC “0” VAL ≤ 0.8V, LOGIC “1” VAH ≥ 2.4V
A1 A0 EN ON
SWITCH
X
0
0
1
1
X
0
1
0
1
0
1
1
1
1
None
1
2
3
4
MAX309
LOGIC “0” VAL ≤ 0.8V, LOGIC “1” VAH ≥ 2.4V
MAX308/MAX309
Precision, 8-Channel/Dual 4-Channel,
High-Performance, CMOS Analog Multiplexers
______________________________________________________________________________________ 11
_Ordering Information (continued)
*Contact factory for dice specifications.
**Contact factory for availability.
16 CERDIP**-55°C to +125°CMAX309MJE
16 CERDIP-40°C to +85°CMAX309EJE
16 Narrow SO-40°C to +85°CMAX309ESE
16 Plastic DIP-40°C to +85°CMAX309EPE
Dice*
16 Narrow SO
16 Plastic DIP
PIN-PACKAGETEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°CMAX309C/D
MAX309CSE
MAX309CPE
PART
16 TSSOP0°C to +70°CMAX309CUE
16 TSSOP-40°C to +85°CMAX309EUE
Package Information
For the latest package outline information, go to
www.maxim-ic.com/packages.
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
© 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
MAX308/MAX309
Precision, 8-Channel/Dual 4-Channel,
High-Performance, CMOS Analog Multiplexers
__________________________________________________________Chip Topographies
V+
NO3
EN
NO4
0.136
(3.45mm)
0.080"
(2.03mm)
COM NO8 NO7
NO5
NO6
N.C.
A0 A1 A2 GND
NO2
NO1
N.C.
V- V+
NO3A
EN
NO4A
0.136
(3.45mm)
0.080"
(2.03mm)
COMA COMB NO4B
NO1B
NO2B
NO3B
A0 A1 N.C. GND
NO2A
NO1A
N.C.
V-
TRANSISTOR COUNT: 122
SUBSTRATE CONNECTED TO V+
TRANSISTOR COUNT: 122
SUBSTRATE CONNECTED TO V+
MAX308 MAX309
N.C. = NO INTERNAL CONNECTION
