SN54ALS244B, SN54AS244, SN74ALS244B, SN74AS244
OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS
SDAS142 – D2661, DECEMBER 1982 – REVISED JULY 1987
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1987, Texas Instruments Incorporated
1
•3-State Outputs Drive Bus Lines or Buffer
Memory Address Registers
•PNP inputs Reduce DC Loading
•Package Options include Plastic Small
Outline Packages, Ceramic Chip Carriers,
and Standard Plastic and Ceramic 300-mil
DIPs
•Dependable Texas instruments Quality and
Reliability
description
These octal buffers and line drivers are designed
specifically to improve both the performance and
density of 3-state memory address drivers, clock
drivers, and bus-oriented receivers and transmit-
ters. Taken together with the ’ALS240A,
’ALS241A, ’AS240, and ’AS241, these devices
provide the choice of selected combinations of
inverting outputs, symmetrical G (active-low input
control) inputs, and complementary G and G
inputs.
The –1 version of the SN74ALS244B is identical
to the standard version except that the
recommended maximum IOL is increased to
48 mA. There is no –1 version of the
SN54ALS244B.
The SN54ALS244B and SN54AS244 are characterized for operation over the full military temperature range
of –55°C to 125°C. The SN74ALS244B and SN74AS244 are characterized for operation from 0°C to 70°C.
logic symbol†
19
11
13
15
17
2G
2A1
2A2
2A3
2A4
9
7
5
3
2Y1
2Y2
2Y3
2Y4
EN
EN
1Y4
1Y3
1Y2
1Y1
12
14
16
18
1A4
1A3
1A2
1A1
1G
8
6
4
2
1
†This
is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
1Y4
1Y3
1Y2
1Y1
12
14
16
18
1A4
1A3
1A2
1A1
1G
8
6
4
2
1
2A4
2A3
2A2
2A1
2G
17
15
13
11
19
1Y4
1Y3
1Y2
1Y1
3
5
7
9
Pin numbers are for DW, J, and N packages.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
SN54ALS244B, SN54AS244 ...J PACKAGE
SN74ALS244B, SN74AS244 . . . DW OR N PACKAGE
(TOP VIEW)
SN54ALS244B, SN54AS244 . . . FK PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
1G
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
VCC
2G
1Y1
A24
1Y2
2A3
1Y3
2A2
1Y4
2A1
3 2 1 20 19
910111213
4
5
6
7
8
18
17
16
15
14
1Y1
2A4
1Y2
2A3
1Y3
1A2
2Y3
1A3
2Y2
1A4
2Y4
1A1
1G
1Y4
2A2 2G
2Y1
GND
2A1 CC
V
SN54ALS244B, SN74ALS244B
OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS
SDAS142 – D2661, DECEMBER 1982 – REVISED JULY 1987
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
2
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage applied to a disabled 3-state output 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range: SN54ALS244B –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74ALS244B 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
recommended operating conditions
SN54ALS244B SN74ALS244B
UNIT
MIN NOM MAX MIN NOM MAX
UNIT
VCC Supply voltage 4.5 5 5.5 4.5 5 5.5 V
VIH High-level input voltage 2 2 V
0.8
VIL Low-level input voltage 0.8†V
IL
g
0.7‡
IOH High-level output current –12 –15 mA
I
Low level output current
12 24
mA
I
OL
L
ow-
l
eve
l
ou
t
pu
t
curren
t
48§m
A
TAOperating free-air temperature –55 125 0 70 °C
†Tested at –55°C to 70°C.
‡Tested at 70°C to 125°C, per MIL-STD-883, method 5005, sub-group 1, 2, and 3. Static tests are performed at 25°C, 125°C, and 55°C.
§The extended limits apply only if VCC is maintained between 4.75 V and 5.25 V. The 48-mA limit applies for the SN74ALS244B-1 only.
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54ALS244B SN74ALS244B
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYPMAX MIN TYPMAX
UNIT
VIK VCC = 4.5 V, II = –18 mA –1.5 –1.5 V
VCC = 4.5 V to 5.5 V, IOH = –0.4 mA VCC–2 VCC–2
V
VCC = 4.5 V to 5.5 V, IOH = –3 mA 2.4 3.2 2.4 3.2
V
V
OH VCC = 4.5 V, IOH = –12 mA 2
V
VCC = 4.5 V, IOH = –15 mA 2
VCC = 4.5 V, IOL = 12 mA 0.25 0.4 0.25 0.4
VOL VCC = 4.75 V, IOL = 24 mA V
OL
(IOL = 48 mA for –1 version)
IOZH VCC = 5.5 V, VO = 2.7 V 20 20 µA
IOZL VCC = 5.5 V, VO = 0.4 V –20 –20 µA
IIVCC = 5.5 V, VI = 7 V 0.1 0.1 mA
IIH VCC = 5.5 V, VI = 2.7 V 20 20 µA
IIL VCC = 5.5 V, VI = 0.4 V –0.1 –0.1 mA
IO#VCC = 5.5 V, VO = 2.25 V –30 –112 –30 –112 mA
Outputs high 9 15 9 15
ICC VCC = 5.5 V Outputs low 15 24 15 24 mA
Outputs disabled 17 27 17 27
All typical values are at VCC = 5 V, TA = 25°C.
#The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
SN54ALS244B, 2N74ALS244B
OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS
SDAS142 – D2661, DECEMBER 1982 – REVISED JULY 1987
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 3
switching characteristics (see Note 1)
PARAMETER FROM
(INPUT) TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX†UNIT
SN54AS244 SN74AS244
MIN MAX MIN MAX
tPLH
A
Y
116 3 10
ns
tPHL
A
Y
3 12 3 10
ns
tPZH
G
Y
126 3 20
ns
tPZL
G
Y
124 3 20
ns
tPHZ
G
Y
2 10 3 10
ns
tPLZ
G
Y
126 3 13
ns
†For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 1: Load circuit and voltage waveforms are shown in Section 1 of the
ALS/AS Logic Data Book, 1986.
SN54AS244, SN74AS244
OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS
SDAS142 – D2661, DECEMBER 1982 – REVISED JULY 1987
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
4
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, VCC 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage applied to a disabled 3-state output 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range: SN54AS244 –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SN74AS244 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
recommended operating conditions
SN54AS244 SN74AS244
UNIT
MIN NOM MAX MIN NOM MAX
UNIT
VCC Supply Voltage 4.5 5 5.5 4.5 5 5.5 V
VIH High-level input voltage 2 2 V
VIL Low-level input voltage 0.8 0.8 V
IOH High-level output current –12 –15 mA
IOL Low-level output current 48 64 mA
TAOperating free-air temperature –55 125 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
TEST CONDITIONS
SN54AS244 SN74AS244
UNIT
PARAMETER
TEST
CONDITIONS
MIN TYP†MAX MIN TYP†MAX
UNIT
VIK VCC = 4.5 V, II = –18 mA –1.2 –1.2 V
VCC = 4.5 V to 5.5 V, IOH = –2 mA VCC–2 VCC–2
V
VCC = 4.5 V, IOH = –3 mA 2.4 3.4 2.4 3.4
V
V
OH VCC = 4.5 V, IOH = –12 mA 2.4
V
VCC = 4.5 V, IOH = –15 mA 2.4
VOL
VCC = 4.5 V, IOL = 48 mA 0.55
V
V
OL VCC = 4.5 V, IOL = 64 mA 0.55
V
IOZH VCC = 5.5 V, VO = 2.7 V 50 50 µA
IOZL VCC = 5.5 V, VO = 0.4 V –50 –50 µA
IIVCC = 5.5 V, VI = 7 V 0.1 0.1 mA
IIH VCC = 5.5 V, VI = 2.7 V 20 20 µA
IIL
G
VCC =55V
VI=04V
–0.5 –0.5
mA
I
IL A
V
CC =
5
.
5
V
,
V
I =
0
.
4
V
–1 –1
mA
IO‡VCC = 5.5 V, VO = 2.25 V –50 –150 50 –150 mA
Outputs high 22 34 22 34
ICC VCC = 5.5 V Outputs low 60 90 60 90 mA
Outputs disabled 34 54 34 54
All typical values are at VCC = 5 V, TA = 25°C.
#The output conditions have been chosen to produce a current that closely approximates one half of the true short-circuit output current, IOS.
SN54AS244, SN74AS244
OCTAL BUFFERS AND LINE DRIVERS WITH 3-STATE OUTPUTS
SDAS142 – D2661, DECEMBER 1982 – REVISED JULY 1987
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 5
switching characteristics (see Note 1)
PARAMETER FROM
(INPUT) TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
R1 = 500 Ω,
R2 = 500 Ω,
TA = MIN to MAX†UNIT
SN54AS244 SN74AS244
MIN MAX MIN MAX
tPLH
A
Y
2 9 2 6.2
ns
tPHL
A
Y
2 7 2 6.2
ns
tPZH
G
Y
210 2 9
ns
tPZL
G
Y
2 8 2 7.5
ns
tPHZ
G
Y
2 6.5 2 6
ns
tPLZ
G
Y
210.5 2 9
ns
†For conditions shown MIN or MAX, use the appropriate value specified under recommended operating conditions.
NOTE 1: Load circuit and voltage waveforms are shown in Section 1 of the
ALS/AS Logic Data Book, 1986.
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Copyright 1999, Texas Instruments Incorporated