1 Features
• Buffered inputs
• Fanout (over temperature range)
– Standard outputs: 10 LSTTL Loads
– Bus driver outputs: 15 LSTTL Loads
• Wide operating temperature range: -55℃ to 125℃
• Balanced propagation delay and transition time
• Significant power reduction compared to LSTTL
Logic ICs
• HC Types
– 2 V to 6 V operation
– High noise immunity: NIL = 30%, NIH = 30% of
VCC at VCC = 5 V
• HCT Types
– 4.5 V to 5.5 V Operation
– Direct LSTTL Input Logic Compatibility,
VIL = 0.8V (Max), VIH = 2 V (Min)

2 Description
The ’HC166 and ’HCT166 8-bit shift register is
fabricated with silicon gate CMOS technology. It
possesses the low power consumption of standard
CMOS integrated circuits, and can operate at speeds
comparable to the equivalent low power Schottky
device.