TEXAS INSTRUMENTS SN54ALS244C, SN54AS244A, SN74ALS244C, SN74AS244A Technical data
SN54ALS244C, SN54AS244A, SN74ALS244C, SN74AS244A
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SDAS142C – JULY 1987 – REVISED AUGUST 1995
• 3-State Outputs Drive Bus Lines or Buffer
Memory Address Registers
• pnp Inputs Reduce dc Loading
• Package Options Include Plastic
Small-Outline (DW) Packages, Ceramic
Chip Carriers (FK), and Standard Plastic (N)
and Ceramic (J) 300-mil DIPs
description
These octal buffers and line drivers are designed
specifically to improve the performance and
density of 3-state memory address drivers, clock
drivers, and bus-oriented receivers and
transmitters. With the ′ALS240A, ′ALS241C,
′AS240A, and ′AS241A, these devices provide the
choice of selected combinations of inverting
outputs, symmetrical active-low output-enable
(OE
) inputs, and complementary OE and OE
inputs.
The -1 version of SN74ALS244C is identical to the
standard version, except that the recommended
maximum I
no -1 version of the SN54ALS244C.
The SN54ALS244C and SN54AS244A are
characterized for operation over the full military
temperature range of –55°C to 125°C. The
SN74ALS244C and SN74AS244A are
characterized for operation from 0°C to 70°C.
for the -1 version is 48 mA. There is
OL
SN54ALS244C, SN54AS244A ...J PACKAGE
SN74ALS244C, SN74AS244A . . . DW OR N PACKAGE
SN54ALS244C, SN54AS244A . . . FK PACKAGE
1A2
2Y3
1A3
2Y2
1A4
(TOP VIEW)
1OE
1
1A1
2
2Y4
3
1A2
4
2Y3
5
1A3
6
2Y2
7
1A4
8
9
2Y1
GND
10
(TOP VIEW)
2Y4
3 2 1 20 19
4
5
6
7
8
910111213
2Y1
1A1
GND
20
19
18
17
16
15
14
13
12
11
V
1OE
2A1
CC
1Y4
V
CC
2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
18
17
16
15
14
2A2 2OE
1Y1
2A4
1Y2
2A3
1Y3
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.
FUNCTION TABLE
(each buffer)
INPUTS
OE A
L H H
L LL
HXZ
OUTPUT
Y
Copyright 1995, Texas Instruments Incorporated
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
1
SN54ALS244C, SN54AS244A, SN74ALS244C, SN74AS244A
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SDAS142C – JULY 1987 – REVISED AUGUST 1995
1
2
4
6
8
19
11
13
15
17
†
EN
EN
logic symbol
1OE
1A1
1A2
1A3
1A4
2OE
2A1
2A2
2A3
2A4
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
18
16
14
12
logic diagram (positive logic)
1
1OE
2
1Y1
1Y2
1Y3
1Y4
9
2Y1
7
2Y2
5
2Y3
3
2Y4
1A1
1A2
1A3
1A4
2OE
2A1
2A2
4
6
8
19
11
13
18
16
14
12
1Y1
1Y2
1Y3
1Y4
9
2Y1
7
2Y2
2A3
2A4
15
17
5
2Y3
3
2Y4
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
Input voltage, V
Voltage applied to a disabled 3-state output 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡
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 under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
: SN54ALS244C –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . .
A
SN74ALS244C 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡
2
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ALS244C, SN54AS244A, SN74ALS244C, SN74AS244A
UNIT
VILLow-level input voltage
V
IOLLow-level output current
mA
PARAMETER
TEST CONDITIONS
UNIT
V
V
V
V
V
V
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SDAS142C – JULY 1987 – REVISED AUGUST 1995
recommended operating conditions
SN54ALS244C SN74ALS244C
MIN NOM MAX MIN NOM MAX
V
CC
V
IH
I
OH
T
A
†
Applies over temperature range –55°C to 70°C
‡
Applies over temperature range 70°C to 125°C
§
Applies only to the -1 version and only if VCC is between 4.75 V and 5.25 V
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
¶
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.
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
High-level input voltage 2 2 V
†
p
High-level output current –12 –15 mA
p
Operating free-air temperature –55 125 0 70 °C
SN54ALS244C SN74ALS244C
MIN TYP¶MAX MIN TYP¶MAX
V
IK
OH
V
OL
I
OZH
I
OZL
I
I
I
IH
I
IL
I
O
I
CC
#
VCC = 4.5 V, II = –18 mA –1.5 –1.5 V
= 4.5 V to 5.5
CC
= 4.5
CC
VCC = 4.5 V
VCC = 5.5 V, VO = 2.7 V 20 20 µA
VCC = 5.5 V, VO = 0.4 V –20 –20 µA
VCC = 5.5 V, VI = 7 V 0.1 0.1 mA
VCC = 5.5 V, VI = 2.7 V 20 20 µA
VCC = 5.5 V, VI = 0.4 V –0.1 –0.1 mA
VCC = 5.5 V, VO = 2.25 V –20 –112 –30 –112 mA
VCC = 5.5 V
IOH = –0.4 mA VCC –2 VCC –2
IOH = –3 mA 2.4 3.2 2.4 3.2
IOH = –12 mA 2
IOH = –15 mA 2
IOL = 12 mA 0.25 0.4 0.25 0.4
IOL = 24 mA 0.35 0.5
IOL = 48 mA (-1 version) 0.35 0.5
Outputs high 9 18 9 17
Outputs low 15 25 15 24
Outputs disabled 17 29 17 27
0.8
‡
0.7
12 24
48
0.8
§
V
mA
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
3
SN54ALS244C, SN54AS244A, SN74ALS244C, SN74AS244A
A
Y
ns
OE
Y
ns
OE
Y
ns
UNIT
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SDAS142C – JULY 1987 – REVISED AUGUST 1995
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
PARAMETER
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
†
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
PLZ
FROM
(INPUT)
TO
(OUTPUT)
R1 = 500 Ω
R2 = 500 Ω,
TA = MIN to MAX
SN54ALS244C SN74ALS244C
MIN MAX MIN MAX
1 16 2 10
3 12 3 10
1 26 3 20
1 24 3 20
2 10 2 10
1 26 1 13
,
†
UNIT
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
Input voltage, V
Voltage applied to a disabled 3-state output 5.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating free-air temperature range, T
Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
‡
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 under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
: SN54AS244A –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
SN74AS244A 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
recommended operating conditions
SN54AS244A SN74AS244A
MIN NOM MAX MIN NOM MAX
V
V
V
I
I
T
CC
IH
IL
OH
OL
A
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
High-level input voltage 2 2 V
Low-level input voltage 0.8 0.8 V
High-level output current –12 –15 mA
Low-level output current 48 64 mA
Operating free-air temperature –55 125 0 70 °C
‡
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
SN54ALS244C, SN54AS244A, SN74ALS244C, SN74AS244A
PARAMETER
TEST CONDITIONS
UNIT
V
V
VOLV
V
V
I
V
5.5 V
V
0.4 V
mA
A
Y
ns
OE
Y
ns
OE
Y
ns
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SDAS142C – JULY 1987 – REVISED AUGUST 1995
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54AS244A SN74AS244A
MIN TYP†MAX MIN TYP†MAX
V
IK
OH
I
OZH
I
OZL
I
I
I
IH
IL
I
O
I
CC
†
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.
OE
A
‡
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
IOH = –3 mA 2.4 3.4 2.4 3.4
VCC = 4.5 V
= 4.5
CC
VCC = 5.5 V, VO = 2.7 V 50 50 µA
VCC = 5.5 V, VO = 0.4 V –50 –50 µA
VCC = 5.5 V, VI = 7 V 0.1 0.1 mA
VCC = 5.5 V, VI = 2.7 V 20 20 µA
,
=
CC
VCC = 5.5 V, VO = 2.25 V –50 –150 –50 –150 mA
VCC = 5.5 V
IOH = –12 mA 2.4
IOH = –15 mA 2.4
IOL = 48 mA 0.55
IOL = 64 mA 0.55
=
I
Outputs high 22 34 22 34
Outputs low 60 90 60 90
Outputs disabled 34 54 34 54
–0.5 –0.5
–1 –1
mA
switching characteristics (see Figure 1)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
PARAMETER
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
§
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
PLZ
FROM
(INPUT)
TO
(OUTPUT)
R1 = 500 Ω
R2 = 500 Ω,
TA = MIN to MAX
SN54AS244A SN74AS244A
MIN MAX MIN MAX
2 9 2 6.2
1 7 1 6.2
1 10 1 9
2 8 2 7.5
1 6.5 1 6
1 10.5 1 9
,
§
UNIT
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
5
SN54ALS244C, SN54AS244A, SN74ALS244C, SN74AS244A
OCTAL BUFFERS AND LINE DRIVERS
WITH 3-STATE OUTPUTS
SDAS142C – JULY 1987 – REVISED AUGUST 1995
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
V
CC
R
L
From Output
Under Test
(see Note A)
C
L
Test
Point
R
L
From Output
Under Test
C
(see Note A)
Test
Point
L
From Output
Under Test
(see Note A)
7 V
RL = R1 = R2
S1
R1
C
L
Test
Point
R2
LOAD CIRCUIT FOR
BI-STATE
TOTEM-POLE OUTPUTS
Timing
Input
t
su
Data
Input
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
Output
Control
(low-level
enabling)
Waveform 1
S1 Closed
(see Note B)
Waveform 2
S1 Open
(see Note B)
t
PZL
t
PZH
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
VOLTAGE WAVEFORMS
1.3 V
t
PHZ
1.3 V
1.3 V
t
1.3 V1.3 V
1.3 V1.3 V
FOR OPEN-COLLECTOR OUTPUTS
h
t
PLZ
LOAD CIRCUIT
3.5 V
0.3 V
3.5 V
0.3 V
3.5 V
0.3 V
[
3.5 V
V
OL
0.3 V
V
OH
0.3 V
[
0 V
High-Level
Low-Level
Out-of-Phase
(see Note C)
Pulse
Pulse
Input
In-Phase
Output
Output
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
1.3 V 1.3 V
t
w
1.3 V 1.3 V
VOLTAGE WAVEFORMS
PULSE DURATIONS
1.3 V 1.3 V
t
PLH
t
PHL
1.3 V 1.3 V
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
1.3 V1.3 V
t
PHL
t
PLH
3.5 V
0.3 V
3.5 V
0.3 V
3.5 V
0.3 V
V
V
V
V
OH
OL
OH
OL
NOTES: A. CL includes probe and jig capacitance.
B. W aveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control.
Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
C. When measuring propagation delay items of 3-state outputs, switch S1 is open.
D. All input pulses have the following characteristics: PRR ≤ 1 MHz, tr = tf = 2 ns, duty cycle = 50%.
E. The outputs are measured one at a time with one transition per measurement.
Figure 1. Load Circuits and Voltage Waveforms
6
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