Philips Semiconductors

Product specification

FBL2033

3.3V BTL 8-bit latched/registered/pass-thru

universal transceiver

1999 Apr 15

4

FUNCTION TABLE

INPUTS

OUTPUTS

MODE

AIn

Bn*

OEB0

OEB1

OEA

LCAB

LCBA

0

0

AOn

Bn

AIn to Bn thru mode

L

—

H

L

L

X

X

LL

XX

Z

H**

AIn to Bn thru mode

H

—

H

L

L

X

X

LL

XX

Z

L

AIn to Bn transparent latch

L

—

H

L

L

H

X

HX

XX

Z

H**

AIn to Bn transparent latch

H

—

H

L

L

H

X

HX

XX

Z

L

AIn to Bn latch and read

l

—

H

L

L

↓

X

HX

XX

Z

H**

AIn to Bn latch and read

h

—

H

L

L

↓

X

HX

XX

Z

L

AIn to Bn register

L

—

H

L

L

↑

X

LH

XX

Z

H**

AIn to Bn register

H

—

H

L

L

↑

X

LH

XX

Z

L

Bn outputs latched and read

(preconditioned latch)

X

—

H

L

L

L

X

HX

XX

Z

latched

data

Bn to AOn thru mode

X

L

L

H

H

X

X

XX

LL

H

input

Bn to AOn thru mode

X

H

L

H

H

X

X

XX

LL

L

input

Bn to AOn transparent latch

X

L

L

H

H

X

H

XX

HX

H

input

Bn to AOn transparent latch

X

H

L

H

H

X

H

XX

HX

L

input

Bn to AOn latch and read

X

l

L

H

H

X

↓

XX

HX

H

input

Bn to AOn latch and read

X

h

L

H

H

X

↓

XX

HX

L

input

Bn to AOn register

X

L

L

H

H

X

↑

XX

LH

H

input

Bn to AOn register

X

H

L

H

H

X

↑

XX

LH

L

input

AOn outputs latched and read

(preconditioned latch)

X

X

L

H

H

X

L

XX

HX

latched

data

X

Disable Bn outputs

X

X

L

X

X

X

X

XX

XX

X

H**

Disable Bn outputs

X

X

X

H

X

X

X

XX

XX

X

H**

Disable AOn outputs

X

X

X

X

L

X

X

XX

XX

Z

X

FUNCTION SELECT TABLE

MODE SELECTED

SXX1

SXX0

Thru mode

L

L

Register mode

L

H

Latch mode

H

X

NOTES:

H

=

High voltage level

L

=

Low voltage level

h

=

High voltage level one set-up time prior to the High-to-Low LCXX transition

l

=

Low voltage level one set-up time prior to the High-to-Low LCXX transition

X

=

Don’t care

Z

=

High-impedance (OFF) state

—

=

Input not externally driven

↑

=

Low-to-High transition

↓

=

High-to-Low transition

H** =

Goes to level of pull-up voltage

Bn* =

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

In Loopback mode (Loopback = High), AIn inputs are routed to the AOn outputs. The Bn inputs are blocked out.