SDAS085B − APRIL 1982 − REVISED DECEMBER 1994
SN54ALS21A, SN54AS21 . . . J PACKAGE
SN74ALS21A, SN74AS21 . . . D OR N PACKAGE
(TOP VIEW)
1A
1B
NC
1C
1D
1Y
GND
description
These devices contain two independent 4-input
positive-AND gates. They perform the Boolean
functions Y = A • B • C • D or Y = A + B + C + D
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
B
C
D
OUTPUT
Y
H
H
H
H
H
L
X
X
X
L
X
L
X
X
L
X
X
L
X
L
X
X
X
L
L
1B
1C
1D
2A
2B
2C
2D
1
2
13
3
12
4
11
5
10
6
9
7
8
VCC
2D
2C
NC
2B
2A
2Y
SN54ALS21A, SN54AS21 . . . FK PACKAGE
(TOP VIEW)
NC
NC
1C
NC
1D
4
3 2 1 20 19
18
5
17
6
16
7
15
8
14
9 10 11 12 13
2C
NC
NC
NC
2B
NC − No internal connection
logic symbol†
1A
14
1Y
GND
NC
2Y
2A
A
1
2D
Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Chip
Carriers (FK), and Standard Plastic (N) and
Ceramic (J) 300-mil DIPs
1B
1A
NC
VCC
•
logic diagram (positive logic)
&
1A
2
6
4
1B
1Y
1C
5
1D
9
2A
10
8
12
2B
2Y
2C
13
2D
1
2
6
4
1Y
5
9
10
12
8
2Y
13
† 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.
Copyright 1994, Texas Instruments Incorporated
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• DALLAS, TEXAS 75265
• HOUSTON, TEXAS 77251−1443
POST OFFICE BOX 655303
POST OFFICE BOX 1443
1
SDAS085B − APRIL 1982 − REVISED DECEMBER 1994
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Operating free-air temperature range, TA: SN54ALS21A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to 125°C
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
4.5
5
5.5
4.5
5
5.5
UNIT
VCC
VIH
Supply voltage
VIL
IOH
Low-level input voltage
0.8
0.8
V
High-level output current
−0.4
−0.4
mA
IOL
TA
Low-level output current
4
8
mA
70
°C
High-level input voltage
2
Operating free-air temperature
2
−55
125
V
V
0
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
VIK
VOH
SN54ALS21A
TYP‡
MAX
TEST CONDITIONS
MIN
VCC = 4.5 V,
VCC = 4.5 V to 5.5 V,
II = −18 mA
IOH = − 0.4 mA
VOL
VCC = 4.5 V
IOL = 4 mA
IOL = 8 mA
II
IIH
VCC = 5.5 V,
VCC = 5.5 V,
VI = 7 V
VI = 2.7 V
IIL
IO§
VCC = 5.5 V,
VCC = 5.5 V,
VI = 0.4 V
VO = 2.25 V
ICCH
ICCL
VCC = 5.5 V,
VCC = 5.5 V,
VI = 4.5 V
VI = 0
SN74ALS21A
TYP‡
MAX
MIN
−1.5
VCC − 2
−1.5
VCC − 2
0.25
V
V
0.4
0.25
0.4
0.35
0.5
V
0.1
0.1
mA
20
20
µA
−0.1
−20
UNIT
−112
−30
−0.1
mA
−112
mA
mA
0.85
1.4
0.85
1.4
1.4
2.3
1.4
2.3
mA
‡ 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.
switching characteristics (see Figure 1)
PARAMETER
FROM
(INPUT)
TO
(OUTPUT)
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500 Ω,
TA = MIN to MAX¶
SN54ALS21A
tPLH
tPHL
A, B, C, or D
Y
SN74ALS21A
MIN
MAX
MIN
MAX
4
18
4
15
2
15
2
10
¶ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
2
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
UNIT
ns
SDAS085B − APRIL 1982 − REVISED DECEMBER 1994
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)†
Supply voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Input voltage, VI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V
Operating free-air temperature range, TA: SN54AS21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55°C to 125°C
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
4.5
5
5.5
4.5
5
5.5
UNIT
VCC
VIH
Supply voltage
VIL
IOH
Low-level input voltage
0.8
0.8
V
High-level output current
−2
−2
mA
IOL
TA
Low-level output current
20
mA
70
°C
High-level input voltage
2
2
V
20
Operating free-air temperature
−55
125
V
0
electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)
PARAMETER
SN54AS21
TYP‡
MAX
TEST CONDITIONS
MIN
VIK
VOH
VCC = 4.5 V,
VCC = 4.5 V to 5.5 V,
II = −18 mA
IOH = − 2 mA
VOL
II
VCC = 4.5 V,
VCC = 5.5 V,
IOL = 20 mA
VI = 7 V
IIH
IIL
IO§
VCC = 5.5 V,
VCC = 5.5 V,
VI = 2.7 V
VI = 0.4 V
VCC = 5.5 V,
VCC = 5.5 V,
VO = 2.25 V
VI = 4.5 V
ICCH
ICCL
SN74AS21
TYP‡
MAX
MIN
−1.2
VCC − 2
−1.2
VCC − 2
0.35
0.5
0.5
V
0.1
0.1
mA
20
20
µA
−112
2.9
V
V
0.35
−0.5
−30
UNIT
−30
4.6
2.9
−0.5
mA
−112
mA
4.6
mA
VCC = 5.5 V,
VI = 0
7.4
12
7.4
12
mA
‡ 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.
switching characteristics (see Figure 1)
PARAMETER
tPLH
tPHL
FROM
(INPUT)
TO
(OUTPUT)
A, B, C, or D
Y
VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500 Ω,
TA = MIN to MAX¶
SN54AS21
SN74AS21
UNIT
MIN
MAX
MIN
MAX
1
6.5
1
6
1
6.5
1
6
ns
¶ For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.
•
POST OFFICE BOX 655303 DALLAS, TEXAS 75265
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
3
SDAS085B − APRIL 1982 − REVISED DECEMBER 1994
PARAMETER MEASUREMENT INFORMATION
SERIES 54ALS/74ALS AND 54AS/74AS DEVICES
7V
RL = R1 = R2
VCC
S1
RL
R1
Test
Point
From Output
Under Test
CL
(see Note A)
From Output
Under Test
RL
Test
Point
CL
(see Note A)
CL
(see Note A)
LOAD CIRCUIT FOR
BI-STATE
TOTEM-POLE OUTPUTS
LOAD CIRCUIT
FOR OPEN-COLLECTOR OUTPUTS
3.5 V
Timing
Input
Test
Point
From Output
Under Test
LOAD CIRCUIT
FOR 3-STATE OUTPUTS
3.5 V
High-Level
Pulse
1.3 V
R2
1.3 V
1.3 V
0.3 V
0.3 V
tsu
Data
Input
tw
th
3.5 V
1.3 V
3.5 V
Low-Level
Pulse
1.3 V
0.3 V
1.3 V
0.3 V
VOLTAGE WAVEFORMS
PULSE DURATIONS
VOLTAGE WAVEFORMS
SETUP AND HOLD TIMES
3.5 V
Output
Control
(low-level
enabling)
1.3 V
1.3 V
0.3 V
tPZL
Waveform 1
S1 Closed
(see Note B)
tPLZ
3.5 V
Input
tPZH
1.3 V
0.3 V
tPHL
tPLH
VOH
In-Phase
Output
VOL
0.3 V
1.3 V
1.3 V
VOL
tPLH
tPHL
VOH
1.3 V
1.3 V
[3.5 V
1.3 V
tPHZ
Waveform 2
S1 Open
(see Note B)
1.3 V
VOH
Out-of-Phase
Output
(see Note C)
0.3 V
[0 V
1.3 V
1.3 V
VOL
VOLTAGE WAVEFORMS
PROPAGATION DELAY TIMES
VOLTAGE WAVEFORMS
ENABLE AND DISABLE TIMES, 3-STATE OUTPUTS
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
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251−1443
•
PACKAGE OPTION ADDENDUM
www.ti.com
14-Oct-2022
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
Samples
(4/5)
(6)
84143012A
ACTIVE
LCCC
FK
20
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
84143012A
SNJ54ALS
21AFK
8414301CA
ACTIVE
CDIP
J
14
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
8414301CA
SNJ54ALS21AJ
Samples
SN54ALS21AJ
ACTIVE
CDIP
J
14
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
SN54ALS21AJ
Samples
SN74ALS21AD
ACTIVE
SOIC
D
14
50
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
ALS21A
Samples
SN74ALS21ADR
ACTIVE
SOIC
D
14
2500
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
ALS21A
Samples
SN74ALS21AN
ACTIVE
PDIP
N
14
25
RoHS & Green
NIPDAU
N / A for Pkg Type
0 to 70
SN74ALS21AN
Samples
SN74ALS21ANSR
ACTIVE
SO
NS
14
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
ALS21A
Samples
SN74AS21D
ACTIVE
SOIC
D
14
50
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
AS21
Samples
SN74AS21N
ACTIVE
PDIP
N
14
25
RoHS & Green
NIPDAU
N / A for Pkg Type
0 to 70
SN74AS21N
Samples
SN74AS21NS
ACTIVE
SO
NS
14
50
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
74AS21
Samples
SN74AS21NSR
ACTIVE
SO
NS
14
2000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
0 to 70
74AS21
Samples
SNJ54ALS21AFK
ACTIVE
LCCC
FK
20
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
84143012A
SNJ54ALS
21AFK
SNJ54ALS21AJ
ACTIVE
CDIP
J
14
1
Non-RoHS
& Green
SNPB
N / A for Pkg Type
-55 to 125
8414301CA
SNJ54ALS21AJ
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
Addendum-Page 1
Samples
Samples
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
14-Oct-2022
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of