TEXAS INSTRUMENTS SN54ALS21A, SN54AS21, SN74ALS21A, SN74AS21 DUAL 4-INPUT POSITIVE-AND GATES Data Sheet
Summary
This comprehensive technical manual details the SN54ALS21A and related series of Dual 4-Input Positive-AND Logic Gates. Designed for circuit designers and electronics engineers, this resource provides critical specifications including electrical characteristics, absolute maximum ratings across various temperature ranges, detailed operating tables, and precise switching timing parameters (tAH, tPLH, etc.). It ensures proper implementation and integration of these reliable logic ICs into demanding digital systems.
Page 1 Text Content
查询SN54ALS21A供应商 SN54ALS21A, SN54AS21, SN74ALS21A, SN74AS21
DUAL 4-INPUT POSITIVE-AND GATES SDAS085B – APRIL 1982 – REVISED DECEMBER 1994 Package Options Include Plastic SN54ALS21A, SN54AS21 J PACKAGE SN74ALS21A, SN74AS21 D OR N PACKAGE
Small-Outline (D) Packages, Ceramic Chip
(TOP VIEW)
Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs
1A VCC
description
NC 2C
These devices contain two independent 4-input 1C NC positive-AND gates. They perform the Boolean 1D 2B functions Y = A • B • C • D or Y = A + B + C + D 1Y 2A in positive logic. GND 2Y The SN54ALS21A and SN54AS21 are characterized for operation over the full military SN54ALS21A, SN54AS21 FK PACKAGE
temperature range of –55°C to 125°C. The (TOP VIEW)
SN74ALS21A and SN74AS21 are characterized for operation from 0°C to 70°C.
FUNCTION TABLE
NC 2C
(each gate)
NC NC
INPUTS OUTPUT
1C NC NC NC 1D 2B
NC – No internal connection
logic symbol† logic diagram (positive logic)
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.
PRODUCTION DATA information is current as of publication date. Copyright 1994, Texas Instruments Incorporated
Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters.
1POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
Page Summary Contents For TEXAS INSTRUMENTS SN54ALS21A, SN54AS21, SN74ALS21A, SN74AS21 DUAL 4-INPUT POSITIVE-AND GATES Data Sheet
Manual Details
| Brand | Texas Instruments |
|---|---|
| Pages | 5 |
| File Size | 72.63 KB |
| Published | May 29, 2026 |
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Frequently Asked Questions
What is the temperature difference between the SN54ALS21A and SN74ALS21A?
The SN54ALS21A supports a range of –55°C to 125°C, while the SN74ALS21A operates from 0°C to 70°C. المرسل
Can these logic gates be used in critical or life-support systems?
No, the product is not designed or warranted for use in life-support devices or other critical applications and doing so is at the customer's own risk.
What are the recommended operating voltage specifications?
The recommended VCC supply voltage typically ranges from a minimum of 4.5V to a maximum of 5.5V.
What risks exist if performance exceeds absolute maximum ratings?
Stresses beyond the listed ‘absolute maximum ratings’ may cause permanent damage to the device, and functional operation is not implied under such conditions.