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SN54ALS21A, SN54AS21, SN74ALS21A, SN74AS21
DUAL 4-INPUT POSITIVE-AND GATES
SDAS085B – APRIL 1982 – REVISED DECEMBER 1994
• Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
description
These devices contain two independent 4-input
positive-AND gates. They perform the Boolean
functions Y = A • B • C • D or Y = A
in positive logic.
The SN54ALS21A and SN54AS21 are
characterized for operation over the full military
temperature range of –55°C to 125°C. The
SN74ALS21A and SN74AS21 are characterized
for operation from 0°C to 70°C.
FUNCTION TABLE
(each gate)
INPUTS
A B C D
H H H H H
L XXX L
XLXX L
XXLX L
XXXL L
+ B + C + D
OUTPUT
Y
SN54ALS21A, SN54AS21 ...J PACKAGE
SN74ALS21A, SN74AS21 ...D OR N PACKAGE
SN54ALS21A, SN54AS21 . . . FK PACKAGE
NC
NC
1C
NC
1D
NC – No internal connection
1A
1B
NC
1C
1D
1Y
GND
3 2 1 20 19
4
5
6
7
8
9 10 11 12 13
(TOP VIEW)
1
14
2
13
3
12
4
11
5
10
6
7
(TOP VIEW)
1B1ANC
1Y
NC
GND
V
CC
2D
2C
NC
2B
2A
9
2Y
8
CC
V
2D
18
2C
17
NC
16
NC
15
NC
14
2B
2Y
2A
logic symbol
1
1A
2
1B
4
1C
5
1D
9
2A
10
2B
12
2C
13
2D
†
This symbol is in accordance with ANSI/IEEE Std 91-1984 and
IEC Publication 617-12.
Pin numbers shown are for the D, J, and N packages.
†
&
6
8
1Y
2Y
logic diagram (positive logic)
1
1A
2
1B
1C
1D
2A
2B
2C
2D
4
5
9
10
12
13
6
8
1Y
2Y
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.
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Copyright 1994, Texas Instruments Incorporated
1
SN54ALS21A, SN54AS21, SN74ALS21A, SN74AS21
UNIT
PARAMETER
TEST CONDITIONS
UNIT
V
V
V
V
(
)
(
)
(INPUT)
(OUTPUT)
A, B, C, or D
Y
ns
DUAL 4-INPUT POSITIVE-AND GATES
SDAS085B – APRIL 1982 – REVISED DECEMBER 1994
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
Input voltage, V
Operating free-air temperature range, T
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
: SN54ALS21A –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
†
SN74ALS21A 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
recommended operating conditions
SN54ALS21A SN74ALS21A
MIN NOM MAX MIN NOM MAX
V
V
V
I
I
T
OH
OL
A
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
CC
High-level input voltage 2 2 V
IH
Low-level input voltage 0.8 0.8 V
IL
High-level output current –0.4 –0.4 mA
Low-level output current 4 8 mA
Operating free-air temperature –55 125 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54ALS21A SN74ALS21A
MIN TYP‡MAX MIN TYP‡MAX
V
IK
V
OH
OL
I
I
I
IH
I
IL
§
I
O
I
CCH
I
‡
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.
CCL
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
= 4.5
CC
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, VI = 4.5 V 0.85 1.4 0.85 1.4 mA
VCC = 5.5 V, VI = 0 1.4 2.3 1.4 2.3 mA
IOL = 4 mA 0.25 0.4 0.25 0.4
IOL = 8 mA 0.35 0.5
switching characteristics (see Figure 1)
PARAMETER
t
PLH
t
¶
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
2
PHL
FROM
INPUT
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
OUTPUT
TO
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500 Ω,
TA = MIN to MAX
SN54ALS21A SN74ALS21A
MIN MAX MIN MAX
4 18 4 15
2 15 2 10
¶
UNIT
SN54ALS21A, SN54AS21, SN74ALS21A, SN74AS21
UNIT
PARAMETER
TEST CONDITIONS
UNIT
(
)
(
)
(INPUT)
(OUTPUT)
A, B, C, or D
Y
ns
DUAL 4-INPUT POSITIVE-AND GATES
SDAS085B – APRIL 1982 – REVISED DECEMBER 1994
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage, V
Input voltage, V
Operating free-air temperature range, T
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CC
7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
: SN54AS21 –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
†
SN74AS21 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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.
recommended operating conditions
SN54AS21 SN74AS21
MIN NOM MAX MIN NOM MAX
V
V
V
I
I
T
OH
OL
A
Supply voltage 4.5 5 5.5 4.5 5 5.5 V
CC
High-level input voltage 2 2 V
IH
Low-level input voltage 0.8 0.8 V
IL
High-level output current –2 –2 mA
Low-level output current 20 20 mA
Operating free-air temperature –55 125 0 70 °C
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
SN54AS21 SN74AS21
MIN TYP‡MAX MIN TYP‡MAX
V
IK
V
OH
V
OL
I
I
I
IH
I
IL
§
I
O
I
CCH
I
‡
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.
CCL
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, IOL = 20 mA 0.35 0.5 0.35 0.5 V
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 –0.5 –0.5 mA
VCC = 5.5 V, VO = 2.25 V –30 –112 –30 –112 mA
VCC = 5.5 V, VI = 4.5 V 2.9 4.6 2.9 4.6 mA
VCC = 5.5 V, VI = 0 7.4 12 7.4 12 mA
switching characteristics (see Figure 1)
PARAMETER
t
PLH
t
¶
For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
PHL
FROM
INPUT
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
OUTPUT
TO
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500 Ω,
TA = MIN to MAX
SN54AS21 SN74AS21
MIN MAX MIN MAX
1 6.5 1 6
1 6.5 1 6
¶
UNIT
3
SN54ALS21A, SN54AS21, SN74ALS21A, SN74AS21
DUAL 4-INPUT POSITIVE-AND GATES
SDAS085B – APRIL 1982 – REVISED DECEMBER 1994
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. Waveform 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
4
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
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