SN54ALS21A, SN54AS21, SN74ALS21A, SN74AS21 is a 4-input positive-AND gate produced by Texas Instruments. It has two independent 4-input positive-AND gates and can work in the temperature range of –55°C to 125°C.
This document provides technical specifications for the SN54ALS21A, SN54AS21, SN74ALS21A, and SN74AS21 devices. These integrated circuits contain two independent 4-input positive-AND gates that perform Boolean functions in positive logic.
| Supply Voltage (VCC) | 4.5 V to 5.5 V |
|---|---|
| High-Level Input Voltage (VIH) | 2 V |
| Low-Level Input Voltage (VIL) | 0.8 V |
| High-Level Output Current (IOH) | -0.4 mA |
| Low-Level Output Current (IOL) | 8 mA |
| Operating Temperature Range (SN54ALS21A/SN54AS21) | -55°C to 125°C |
| Operating Temperature Range (SN74ALS21A/SN74AS21) | 0°C to 70°C |
The absolute maximum rating for supply voltage is 7V.