5962-8858901DA Datasheet, PDF (1/18 Pages) Texas Instruments – DUAL 4-INPUT POSITIVE-NAND GATES

SN54ALS20A, SN54AS20, SN74ALS20A, SN74AS20
DUAL 4ĆINPUT POSITIVEĆNAND 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-NAND gates. They perform the Boolean
functions Y = A • B • C • D or Y = A + B + C + D
in positive logic.
The SN54ALS20A and SN54AS20 are
characterized for operation over the full military
temperature range of − 55°C to 125°C. The
SN74ALS20A and SN74AS20 are characterized
for operation from 0°C to 70°C.
SDAS192B − APRIL 1982 − REVISED DECEMBER 1994
SN54ALS20A, SN54AS20 . . . J PACKAGE
SN74ALS20A, SN74AS20 . . . D OR N PACKAGE
(TOP VIEW)
1A 1
1B 2
NC 3
1C 4
1D 5
1Y 6
GND 7
14 V_CC
13 2D
12 2C
11 NC
10 2B
9 2A
8 2Y
SN54ALS20A, SN54AS20 . . . FK PACKAGE
(TOP VIEW)
FUNCTION TABLE
(each gate)
INPUTS
OUTPUT
A
B
C
D
Y
H
H
H
H
L
L
X
X
X
H
X
L
X
X
H
X
X
L
X
H
X
X
X
L
H
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
NC − No internal connection
logic symbol^†
logic diagram (positive logic)
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.
1A ¹
2
1B
1C ⁴
5
1D
9
2A
10
2B
2C ¹²
13
2D
6
1Y
8
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.
Copyright  1994, Texas Instruments Incorporated
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