1 Features
• Three-state buffered outputs
• Gated input and output enables
• Fanout (over temperature range)
– Standard outputs : 10 LSTTL loads
– Bus driver outputs : 15 LSTTL loads
• Wide Operating Temperature Range : -55°C to
125°C
• Balanced propagation delay and transition times
• Significant power and 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= 0.8
V (Max), VIH = 2 V (Min)
– CMOS input compatibility, Il ≤ 1μA at VOL, VOH

2 Description
The CDx4HC173 and CDx4HCT173 contains four
independent D-type flip-flops with shared clock (CP),
reset (MR), and data enable (E1, E2) pins.