SN54ALS33A, SN74ALS33A are quadruple 2-input positive-NOR buffers with open-collector outputs. These devices require resistive pullup to perform correctly and can deliver higher VOH levels. They are commonly used in wired-AND applications. These devices perform the Boolean functions Y = A • B or Y = A + B in positive logic.
The SN54ALS33A and SN74ALS33A devices contain four independent 2‑input positive‑NOR buffers with open‑collector outputs. They operate in positive‑logic, delivering higher voltage levels and are commonly used in wired‑AND applications. The SN54 version is rated for a military temperature range of –55 °C to 125 °C, while the SN74 version is rated from 0 °C to 70 °C.
The datasheet lists absolute‑maximum ratings, recommended operating conditions, electrical characteristics, and package options for plastic (N, J) and ceramic (J) packages. It also provides mechanical dimensions, tape‑and‑reel information, and ordering status (active, NRND, obsolete).
| High‑level input voltage (VIH) | 2 V |
|---|---|
| Low‑level input voltage (VIL) | 0.7 V – 0.8 V |
| High‑level output voltage (VOH) | 5.5 V |
| Low‑level output current (IOL) | 12 mA – 24 mA |
It provides an open‑collector output that requires a resistive pull‑up.
The device can sink 12 mA to 24 mA of low‑level output current.