1 Features
• Common clock and asynchronous controller reset
• Positive edge triggering
• 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 times
• 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 = 5V
• 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, II ≤ 1 μA at VOL,VOH

2 Description
The ’HC273 and ’HCT273 high speed octal D-Type
flip-flops with a direct clear input are manufactured
with silicon-gate CMOS technology. They possess the
low power consumption of standard CMOS integrated
circuits.
Information at the D input is transferred to the Q
outputs on the positive-going edge of the clock pulse.
All eight flip-flops are controlled by a common clock
(CLK) and a common reset (CLR). Resetting is
accomplished by a low voltage level independent of
the clock. All eight Q outputs are reset to a logic 0.