TC74HC166AP/AF/AFN

2007-10-01

1

TOSHIBA CMOS Digital Integrated Circuit Silicon Monolithic

TC74HC166AP,TC74HC166AF,TC74HC166AFN

8-Bit Shift Register (P-IN, S-OUT)

The TC74HC166A is a high speed CMOS 8-BIT

PARALLEL/SERIAL-IN, SERIAL-OUT SHIFT REGISTER

It achieves the high speed operation similar to equivalent

LSTTL while maintaining the CMOS low power dissipation.

It consists of parallel-in or serial-in, serial-out 8-bit shift

register with a gated clock input and an overriding clear input.

The parallel-in or serial-in modes are controlled by the

SHIFT/ LOAD input. When the SHIFT/ LOAD input is held

high, the serial data input is enabled and the eight flip-flops

perform serial shifting on each clock pulse. When held low, the

parallel data inputs are enabled and synchronous loading occurs

on the next clock pulse. Clocking is accomplished on the

low-to-high transition of the clock pulse. The CK-INH input

should be shifted high only while the CK input is held high. A

direct clear input overrides all other inputs, includng the clock,

and sets all the flip-flops to zero. Functional details are shown in

the truth table and the timing charts.

All inputs are equipped with protection circuits against static

discharge or transient excess voltage.

Features

• Output drive immunity: 10 LSTTL loads

• Pin and function compatible with 74LS166

Pin Assignment

Note: xxxFN (JEDEC SOP) is not available in

Japan.

TC74HC166AP

TC74HC166AF

TC74HC166AFN

Weight

DIP16-P-300-2.54A

: 1.00 g (typ.)

SOP16-P-300-1.27A

: 0.18 g (typ.)

SOL16-P-150-1.27

: 0.13 g (typ.)