Philips Semiconductors

Product specification

FB2040A

8-bit Futurebus+ transceiver

1995 May 25

4

PIN DESCRIPTION

SYMBOL

PIN NUMBER

TYPE

NAME AND FUNCTION

AI0 – AI7

51, 2, 3, 8, 9, 14, 18, 24

Input

Data inputs (TTL)

AO0 – AO7

50, 52, 4, 6, 10, 12, 16, 20

Output

3-state outputs (TTL)

B0 – B7

40, 38, 36, 34,

32, 30, 28, 26

I/O

Data inputs/Open Collector outputs. High current drive (BTL)

OEB0

46

Input

Enables the B outputs when High

OEB1

45

Input

Enables the B outputs when Low

OEA

47

Input

Enables the A outputs when High

BUS GND

41, 39, 37, 35, 33, 31, 29, 27

GND

Bus ground (0V)

LOGIC GND

1, 5, 7, 11, 13, 15

GND

Logic ground (0V)

23, 43

Power

Positive supply voltage

49

Power

Positive supply voltage

17

Power

Band Gap threshold voltage reference

BG GND

19

GND

Band Gap threshold voltage reference ground

BIAS V

48

Power

Live insertion pre-bias pin

TMS

42

Input

Test Mode Select (optional, if not implemented then no-connect)

TCK

44

Input

Test Clock (optional, if not implemented then no-connect)

TDI

22

Input

Test Data In (optional, if not implemented then shorted to TDO)

TDO

21

Output

Test Data Out (optional, if not implemented then shorted to TDI)

NC

25

NC

No Connect

FUNCTION TABLE

MODE

INPUTS

OUTPUTS

MODE

AIn

Bn*

OEB0

OEB1

OEA

AOn

Bn*

L

—

H

L

L

Z

H**

AIn to Bn

H

—

H

L

L

Z

L

AIn to Bn

L

—

H

L

H

L

H**

H

—

H

L

H

H

L

Disable Bn outputs

X

X

L

X

X

X

H**

Disable Bn out uts

X

X

X

H

X

X

H**

X

L

L

X

H

H

Input

Bn to AOn

X

H

X

H

H

L

Input

Bn to AOn

X

L

X

H

H

H

Input

X

H

L

X

H

L

Input

Disable AOn outputs

—

X

X

X

L

Z

X

H** =

Goes to level of pull-up voltage

B*

=

Precaution should be taken to ensure B inputs do not float. If they do, they are equal to Low state.