The TC74VHC165 is an advanced high speed CMOS 8-BIT

PARALLEL/SERIAL-IN, SERIAL OUT SHIFT REGISTER

fabricated with silicon gate C2MOS technology.

It achieves the high speed operation similar to equivalent

Bipolar Schottky TTL 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. When the SHIFT/LOAD

input is held high, the serial data input is enabled and the

eight frip-frops perform serial shifting with each clock pulse.

When the SHIFT/LOAD input is held low, the parallel data is

loaded synchronously into the register at positive going

transition of the clock pulse.

The CK-INH input should be shifted high only when the CK

input is held high.

An Input protection circuit ensures that 0 to 7V can be

applied to the input pins without regard to the supply

voltage. This device can be used to interface 5V to 3V

systems and on two supply systems such as battery back up.

This circuit prevents device destruction due to mismatched

supply and input voltages.

FEATURES:

.

High Speed

? Low Power Dissipation

High Noise Immunity...

.

? Power Down Protection is provided on all inputs.

? Balanced Propagation Delays...tpLH=tpHL

MAX 150MHz(typ.) at Vcc=5V

Icc=4/A(Max.) at Ta = 25°C

VNIH-VNIL -28 Vcc (Min.)

? Wide Operating Voltage Range Vcc (opr)=2V~5.5V

Pin and Function Compatible with 74ALS165