Dual 4-Input Positive-AND Gate
SN54ALS21A, SN54AS21, SN74ALS21A, SN74AS21 DUAL 4ĆINPUT POSITIVEĆAND GATES
• Package Options Include Plastic
Small-Outl...
Description
SN54ALS21A, SN54AS21, SN74ALS21A, SN74AS21 DUAL 4ĆINPUT POSITIVEĆAND GATES
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 + 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
OUTPUT
A
B
C
D
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
logic symbol†
1 1A
&
2
1B
4
1C
5
1D
9 2A
10 2B
12 2C
13 2D
6 1Y
8 2Y
† 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.
SDAS085B − APRIL 1982 − REVISED DECEMBER 1994
SN54ALS21A, SN54AS21 . . . J PACKAGE SN74ALS21A, SN74AS21 . . . D OR N PACKAGE
(TOP VIEW)
1A 1 1B 2 NC 3 1C 4 1D 5 1Y 6 GND 7
14 VCC 13 2D 12 2C 11 NC 10 2B 9 2A 8 2Y
SN54ALS21A, SN54AS21 . . . FK PACKAGE (TOP VIEW)
2D
VCC
NC
1A
1B
3 2 1 20 19
NC 4
18 2C
NC 5
17 NC
1C 6
16 NC
NC 7
15 NC
1D 8
14 2B
9 10 11 12 13
2A
2Y
NC
GND
1Y
NC − No internal connection
logic diagram (positive logic)
1A 1 1B 2 1C 4
5 1D
2A 9 2B 10 2C 12 2D 13
6 1Y 8 2Y
PRODUCTION DATA information is current ...
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