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SN74ALS21A 数据表(PDF) 1 Page - Texas Instruments

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部件名 SN74ALS21A
功能描述  DUAL 4-INPUT POSITIVE-AND GATES
Download  17 Pages
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制造商  TI1 [Texas Instruments]
网页  http://www.ti.com
标志 TI1 - Texas Instruments

SN74ALS21A 数据表(HTML) 1 Page - Texas Instruments

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SN54ALS21A, SN54AS21, SN74ALS21A, SN74AS21
DUAL 4INPUT POSITIVEAND GATES
SDAS085B − APRIL 1982 − REVISED DECEMBER 1994
Copyright
1994, Texas Instruments Incorporated
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
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
OUTPUT
Y
H
H
H
H
H
L
XX
X
L
X
LX
X
L
X
XL
X
L
X
X
X
L
L
logic symbol
logic diagram (positive logic)
&
1Y
6
2Y
8
1
1A
2
1B
4
1C
5
1D
9
2A
10
2B
12
2C
13
2D
1Y
1D
1A
1B
1C
2C
2B
2A
2D
2Y
1
2
4
5
9
10
12
13
6
8
† 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.
SN54ALS21A, SN54AS21 ...J PACKAGE
SN74ALS21A, SN74AS21 ...D OR N PACKAGE
(TOP VIEW)
1
2
3
4
5
6
7
14
13
12
11
10
9
8
1A
1B
NC
1C
1D
1Y
GND
VCC
2D
2C
NC
2B
2A
2Y
SN54ALS21A, SN54AS21 . . . FK PACKAGE
(TOP VIEW)
3
2
1 20 19
9 10 11 12 13
4
5
6
7
8
18
17
16
15
14
2C
NC
NC
NC
2B
NC
NC
1C
NC
1D
NC − No internal connection
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.


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