74HCT652 데이터 시트보기 (PDF) - Philips Electronics

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74HCT652

Octal bus transceiver/register; 3-state

Philips Electronics 

Philips Semiconductors

Octal bus transceiver/register; 3-state

Product specification

74HC/HCT652

FUNCTION TABLE

INPUTS (1)

DATA I/O (2)

OPERATION OR FUNCTION

OEAB OEBA CPAB CPBA SAB SBA

L

H H or L H or L X X

L

H

↑

↑

XX

X

H

↑ H or L X X

H

H

↑

↑

LX

L

X H or L ↑

XX

L

L

↑

↑

XL

L

L

X

X XL

L

L

X H or L X H

H

H

X

X

LX

H

H H or L X H X

H

L H or L H or L H H

A1 THRU A8

Input

Input

Input

Not specified

Ouput

Ouput

Input

Output

B1 THRU B8

Input

Not specified

Output

Input

Input

Input

Output

Output

HC/HCT652

Isolation

Store A and B data

Store A, Hold B

Store A in both registers

Hold A, Store B

Store B in both registers

Real Time B Data to A Bus

Stored B Data to A Bus

Real Time A Data to B Bus

Stored A Data to B Bus

Stored A Data to B Bus and

Stored B Data to A Bus

Notes

1. H = HIGH voltage level

L = LOW voltage level

X = don’t care

↑ = LOW-to-HIGH transition

2. The data output functions may be enabled or disabled by various signals at OEAB and OEBA inputs. Data input

functions are always enabled, i.e., data at the bus inputs will be stored on every LOW-to-HIGH transition on the clock

inputs.

Fig.4 Functional diagram.

September 1993

4

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