This document describes the features and characteristics of the SDAS192B chip, including two independent 4-input positive-NAND gates and the applicable temperature range.
The SN54ALS20A (and related SN54AS20, SN74ALS20A, SN74AS20) are dual 4‑input positive‑NAND gate devices that perform Boolean functions in positive logic. They are available in a range of plastic and ceramic packages and are qualified for military‑grade temperature ranges.
The document lists absolute maximum ratings, recommended operating conditions, electrical and switching characteristics, package‑option addenda, mechanical dimensions, and legal notices. Key parameters such as supply voltage, input thresholds, output currents, and temperature limits are detailed for designers and technicians.
| High‑level input voltage (VIH) | 2.0 V |
|---|---|
| Low‑level input voltage (VIL) | 0.8 V |
| High‑level output current (I_OH) | -0.4 mA |
| Low‑level output current (I_OL) | 4 – 8 mA |
| Operating temperature range (SN54ALS20A) | -55 °C – 125 °C |
| Package options | Plastic Small‑Outline (D), Ceramic Chip Carriers (FK), Standard Plastic (N) and Ceramic (J) 300‑mil DIPs |
The SN54ALS20A is specified for –55 °C to 125 °C operating temperature.
It is offered in plastic Small‑Outline (D), ceramic chip carrier (FK), and standard plastic (N) or ceramic (J) 300‑mil DIP packages.
The high‑level input threshold (VIH) is 2 V and the low‑level input threshold (VIL) is 0.8 V.