MB2646 datasheet(2/16 Pages) PHILIPS

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Philips Semiconductors Products

Product specification

MB2646

Dual octal bus transceiver/registers (3-State)

August 23, 1993

DESCRIPTION (continued)

The select (nSAB, nSBA) pins determine

whether data is stored or transferred through

the device in real-time. The nDIR determines

which bus will receive data when the nOE is

active Low. In the isolation mode (nOE =

High), data from Bus A may be stored in the

B register and/or data from Bus B may be

stored in the A register. When an output

function is disabled, the input function is still

enabled and may be used to store and

transmit data. Only one of the two buses, A

or B may be driven at a time.

PIN DESCRIPTION

PIN NUMBER

SYMBOL

NAME AND FUNCTION

48, 45, 19, 22

1CPAB, 1CPBA, 2CPAB, 2CPBA

Clock input A to B / Clock input B to A

49, 44, 18, 23

1SAB, 1SBA, 2SAB, 2SBA

Select input A to B / Select input B to A

47, 20

1DIR, 2DIR

Direction control inputs

50, 51, 1, 2, 3, 5, 6, 7,

8, 9, 10, 11, 12, 13, 15, 16

1A0 – 1A7,

2A0 – 2A7

Data inputs/outputs (A side)

42, 41, 39, 38, 37, 36, 35, 34,

33, 32, 31, 29, 28, 27, 25, 24

1B0 – 1B7,

2B0 – 2B7

Data inputs/outputs (B side)

46, 21

1OE, 2OE

Output enable inputs

4, 17, 30, 43

GND

Ground (0V)

14, 26, 40, 52

VCC

Positive supply voltage

LOGIC SYMBOL (IEEE/IEC)

≥1

∇1

3EN1 [BA]

3EN2 [AB]

6 1

≥1

∇

≥1

∇1

3EN1 [BA]

3EN2 [AB]

6 1

≥1

∇

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