描述 Description

These dual 4-bit D-type edge-triggered flip-flops feature 3-state outputs designed specifically as bus drivers. They are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers.The edge-triggered flip-flops enter data on the low-to-high transition of the clock (CLK) input. The SN54ALS874B, SN74ALS874B, and SN74AS874 have clear () inputs and noninverting Q outputs. The SN74ALS876A and SN74AS876 have preset () inputs and inverting Q\\ outputs; takinglow causes the four Q or Q\\ outputs to go low independently of the clock. The SN54ALS874B is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALS874B, SN74ALS876A, SN74AS874, and SN74AS876 devices are characterized for operation from 0°C to 70°C.

特性 Features

? 3-State Buffer-Type Outputs Drive Bus Lines Directly
? Bus-Structured Pinout
? Choice of True or Inverting Logic
? SN54ALS874B, SN74ALS874B, SN74AS874 Have True Outputs
? SN74ALS876A, SN74AS876 Have Inverting Outputs

? Asynchronous Clear
? Package Options Include Plastic Small-Outline (DW) Packages, Plastic (FN) and Ceramic (FK) Chip Carriers, and Standard Plastic (NT) and Ceramic (JT) 300-mil DIPs