8401001LA中文资料德州仪器数据手册PDF规格书

• 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

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 (CLR) inputs and

noninverting Q outputs. The SN74ALS876A and

SN74AS876 have preset (PRE) inputs and

inverting Q outputs; taking PRE low 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.