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.