HD74AC166 datasheet(2/9 Pages) RENESAS

2 / 9 page

HD74AC166/HD74ACT166

Rev.2.00, Jul.16.2004, page 2 of 8

Logic Symbol

PE P0

VCC=Pin16

GND=Pin8

P1 P2 P3 P4 P5 P6 P7

913

5 10 11 12 14

Pin Names

1, CP2

Clock Pulse Inputs (Active Rising Edge)

Serial Data Input

Parallel Enable Input (Active Low)

0 to P7

Parallel Data Inputs

Asynchronous Master Reset Input (Active Low)

Last Stage Output

Functional Description

Operation is synchronous (except for Master Reset) and state changes are initiated by the rising edge of either clock

input if the other clock input is Low. When one of the clock inputs is used as an active High clock inhibt, it should

attain the High state while the other clock is still in the High state following the previous operation. When the Parallel

Enable (

PE) input is Low, data is loaded into the register from the Parallel Data (P

0 to P7) inputs on the next rising edge

of the clock. When

PE is High, information is shifted from the Serial Data (D

S) input to Q0 and all data in the register is

shifted one bit position (i.e., Q

0 → Q1, Q1 → Q2, etc.) on the rising edge of the clock.

Truth Table

Inputs

Parallel

Internal Outputs

Output

0 to P7

XXXXXL

XXQ

a ··· h

XXQ

H :

High Voltage Level

Low Voltage Level

X :

Immaterial

Low-to-High Clock Transition

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