Philips Semiconductors FAST Products

Product specification

74F8962/8963

9-Bit latched bidirectional Futurebus transceivers

(open-collector)

March 11, 1993

5

FUNCTION TABLE FOR 74F8962

INPUTS

LATCH STATES

OUTPUTS

OPERATING MODE

AIn

Bn*

LEAB

LEBA

OEAB

OEBA

AB

BA

AOn

Bn

H

H

L

L

H

H

H

H

Z

X

L

L

L

L

H

H

L

L

Z

X

B and AO disabled

X

X

H

H

H

H

Qn

Qn

Z

X

H

–

L

X

L

H

H

Qn

Z

L

AO 3–state, transparent data from AI to B

L

–

L

X

L

H

L

Qn

Z

H**

X

H

X

L

H

L

Qn

H

L

X

B disabled, transparent data from B to AO

X

L

X

L

H

L

Qn

L

H

X

X

X

H

X

L

H

Qn

Qn

Z

Qn

AO 3–state, latched data to B

X

X

X

H

H

L

Qn

Qn

Qn

X

B disabled, latched to AO

X

X

H

H

L

L

Qn

Qn

Qn

Qn

Latched state to AO and B

H

–

L

L

L

L

H

L

H

L

Read back from AI to B to AO

L

–

L

L

L

L

L

H

L

H**

(both latches transparent)

Notes to function table for 74F8962

1. H = High voltage level

2. L

= Low voltage level

3. X = Don’t care

4. –

= Input not externally driven

5. Z = High impedance ”off’ state

7. H**= Goes to level of pullup voltage.

8. B* = Precaution should be taken to insure B inputs do not float. If they do they are equal to low state.

FUNCTION TABLE FOR 74F8963

INPUTS

LATCH STATES

OUTPUTS

OPERATING MODE

AIn

Bn*

LEAB

LEBA

OEAB

OEBA

AB

BA

AOn

Bn

H

H

L

L

H

H

L

L

Z

X

L

L

L

L

H

H

H

H

Z

X

B and AO disabled

X

X

H

H

H

H

Qn

Qn

Z

X

H

–

L

X

L

H

L

Qn

Z

H

AO 3–state, transparent data from AI to B

L

–

L

X

L

H

H

Qn

Z

L

X

H

X

L

H

L

Qn

L

H

X

B disabled, transparent data from B to AO

X

L

X

L

H

L

Qn

H

L

X

X

X

H

X

L

H

Qn

Qn

Z

Qn

AO 3–state, latched data to B

X

X

X

H

H

L

Qn

Qn

Qn

X

B disabled, latched to AO

X

X

H

H

L

L

Qn

Qn

Qn

Qn

Latched state to AO and B

H

–

L

L

L

L

L

L

H

H**

Read back from AI to B to AO

L

–

L

L

L

L

H

L

L

L

(both latches transparent)

Notes to function table for 74F8963

1. H = High voltage level

2. L

= Low voltage level

3. X = Don’t care

4. –

= Input not externally driven

5. Z = High impedance ”off” state

7. H**= Goes to level of pullup voltage.

8. B* = Precaution should be taken to insure B inputs do not float. If they do they are equal to low state.