DUAL 4-INPUT POSITIVE-AND GATES - Texas Instruments
Description
SN74HC21, SN54HC21
SCLS087F – DECEMBER 1982 – REVISED JUNE 2021
SNx4HC21 Dual 4-Input AND Gates
1 Features
• Buffered inputs • Wide operating voltage range: 2 V to 6 V • Wide operating temperature range: -40°C to +85°C • Supports fanout up to 10 LSTTL loads • Significant power reduction compared to LSTTL
logic ICs
2 Applications
• Combining power good signals • Enable digital signals
3 Description
This device contains two independent 4-input AND gates.
Each gate performs the Boolean function Y = A ● B ● C ● D in positive logic.
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SN74HC21D
SOIC (14)
8.
70 mm × 3.
90 mm
SN74HC21N
PDIP (14)
19.
30 mm × 6.
40 mm
SN74HC21NS
SO (14)
10.
20 mm × 5.
30 mm
SN74HC21PW
TSSOP (14) 5.
00 mm × 4.
40 mm
SN54HC21J
CDIP (14)
21.
30 mm × 7.
60 mm
SN54HC21FK
LCCC (20)
8.
90 mm × 8.
90 mm
(1) For all available packages, see the orderable addendum at the end of the data sheet.
1 1A
2 1B
3 NC
4 1C
5 1D
6 1Y
7 GND
14 VCC
13 2D
12 2C
11 NC
10 2B
9 2A
8 2Y
Functional pinout
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers.
PRODUCTION DATA.
SN74HC21, SN54HC21
SCLS087F – DECEMBER 1982 – REVISED JUNE 2021
www.
ti.
com
Table of Contents
1 Features.
1 2 Applications.
.
.
.
1 3 Description.
1 4 Revision History.
.
2 5 Pin Configuration and Functions3
Pin Functions.
.
.
3 6 Specifications.
4
6.
1 Absolute Maximum Ratings 4 6.
...
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