Philips Semiconductors Products

Product specification

MB2646

Dual octal bus transceiver/registers (3-State)

August 23, 1993

4

LOGIC DIAGRAM

1D

C1

Q

nB1

nB2

nB3

nB4

nB5

nB6

nB7

nA1

nA2

nA3

nA4

nA5

nA6

nA7

DETAIL A X 7

nOE

nDIR

nCPBA

nSBA

nCPAB

nSAB

nB0

1D

C1

Q

nA0

1of 8 Channels

FUNCTION TABLE

INPUTS

DATA I/O

OPERATING MODE

nOE

nDIR

nCPAB

nCPBA

nSAB

nSBA

nAx

nBx

X

X

↑

X

X

X

Input

Unspecified

output*

Store A, B unspecified

X

X

X

↑

X

X

Unspecified

output*

Input

Store B, A unspecified

H

H

X

X

↑

H or L

↑

H or L

X

X

X

X

Input

Input

Store A and B data

Isolation, hold storage

L

L

L

L

X

X

X

H or L

X

X

L

H

Output

Input

Real time B data to A bus

Stored B data to A bus

L

L

H

H

X

H or L

X

X

L

H

X

X

Input

Output

Real time A data to B bus

Stored A data to B bus

H = High voltage level

L

= Low voltage level

X = Don’t care

↑ = Low-to-High clock transition

*

The data output function may be enabled or disabled by various signals at the nOE input. Data input functions are always enabled, i.e.,

data at the bus pins will be stored on every Low-to-High transition of the clock.