SN54ALS874B, SN74ALS874B, SN74ALS876A SN74AS874, SN74AS876 DUAL 4-BIT D-TYPE EDGE-TRIGGERED FLIP-FLOPS is a series of products produced by Texas Instruments, with 3-State buffer output, can directly drive bus lines, and has selection of true value logic and asynchronous clear function.
The handbook describes the SN54ALS874B family of dual 4‑bit D‑type edge‑triggered flip‑flops with 3‑state outputs, clear and preset functions, and both true and inverting output options. It includes functional tables, logic symbols, recommended operating conditions, and detailed electrical and switching characteristics.
Mechanical data, package options (DW, JT, NT, FN, FK), and measurement procedures are also provided, along with an important notice covering warranty, usage restrictions, and legal information.
| High‑level input voltage (VIH) | 2 V |
|---|---|
| Low‑level input voltage (VIL) | 0.7 V – 0.8 V |
| High‑level output current (IOH) | -1 mA – -2.6 mA |
| Maximum clock frequency | 30 MHz (SN54ALS874B) / 125 MHz (SN74AS874) |
| Operating temperature range | -55 °C – 125 °C (SN54ALS874B) / 0 °C – 70 °C (others) |
The SN54ALS874B family supports clock frequencies up to 30 MHz, while some variants such as SN74AS874 can operate up to 125 MHz.
High‑level inputs require at least 2 V, and low‑level inputs must be below 0.7 V (or 0.8 V for some variants).
SN54ALS874B devices are rated from –55 °C to 125 °C, while other family members are rated from 0 °C to 70 °C.