• 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.