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