1 Features

• Buffered inputs

• Asynchronous parallel load

• Complementary outputs

• 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 ’HC165 and ’HCT165 are 8-bit parallel or serialin

shift registers with complementary serial outputs

(QH and Q H) available from the last stage. When

the parallel load (SH/LD) input is LOW, parallel data

from the A to H inputs are loaded into the register

asynchronously. When the SH/LD is HIGH, data

enters the register serially at the SER input and shifts

one place to the right (A→B→C, etc.) with each

positive-going clock transition. This feature allows

parallel-to-serial converter expansion by connecting

the QH output to the SER input of the succeeding

device.