The SN54ALS273 and SN74ALS273 are octal positive-edge-triggered flip-flops from Texas Instruments that implement D-type flip-flop logic with a direct-clear (CLR) input. The flip-flops use TTL circuitry and contain eight single-rail outputs, buffered clock and direct-clear inputs, and individual data inputs to each flip-flop. Applications for the flip-flops include buffer/storage registers, shift registers, and pattern generators. The flip-flops are available in plastic small-outline (DW) packages, ceramic chip carriers (FK), and standard plastic (N) and ceramic (J) 300-mil DIPs.
The SN54ALS273 and SN74ALS273 are octal positive‑edge‑triggered D‑type flip‑flops with a direct‑clear (CLR) input. They are offered in multiple package styles, including plastic DIP, small‑outline (DW) and ceramic (J) packages. The devices feature buffered clock inputs and individual data inputs for each flip‑flop.
The document provides absolute maximum ratings, recommended operating conditions, electrical characteristics, switching characteristics and test circuit information. It also includes a notice on product warranties and critical‑application usage.
| High‑level output current (IOH) | -1 mA to -2.6 mA |
|---|---|
| Maximum clock frequency | 30 MHz (SN54ALS273) / 35 MHz (SN74ALS273) |
| Operating temperature range (SN54ALS273) | -55 °C to 125 °C |
| Operating temperature range (SN74ALS273) | 0 °C to 70 °C |
SN54ALS273 supports up to 30 MHz, while SN74ALS273 supports up to 35 MHz.
SN54ALS273 operates from –55 °C to 125 °C; SN74ALS273 operates from 0 °C to 70 °C.