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74F8962 Datasheet, PDF (5/10 Pages) NXP Semiconductors – 9-Bit latched bidirectional Futurebus transceivers open-collector
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Philips Semiconductors FAST Products
9-Bit latched bidirectional Futurebus transceivers
(open-collector)
Product specification
74F8962/8963
FUNCTION TABLE FOR 74F8962
INPUTS
LATCH STATES
OUTPUTS
OPERATING MODE
AIn Bn* LEAB LEBA OEAB OEBA
AB
BA
AOn Bn
HH
L
L
H
H
H
H
ZX
LL
L
L
H
H
L
L
Z
X B and AO disabled
XX
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**
XH
X
L
H
L
Qn
H
L
X B disabled, transparent data from B to AO
XL
X
L
H
L
Qn
L
H
X
XX
H
X
L
H
Qn
Qn
Z Qn AO 3–state, latched data to B
XX
X
H
H
L
Qn
Qn
Qn X B disabled, latched to AO
XX
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
6. Qn = High or low voltage level one setup time prior to the low–to–high LEXX transition.
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
HH
L
L
H
H
L
L
ZX
LL
L
L
H
H
H
H
Z
X B and AO disabled
XX
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
XH
X
L
H
L
Qn
L
H
X B disabled, transparent data from B to AO
XL
X
L
H
L
Qn
H
L
X
XX
H
X
L
H
Qn
Qn
Z Qn AO 3–state, latched data to B
XX
X
H
H
L
Qn
Qn
Qn X B disabled, latched to AO
XX
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
6. Qn = High or low voltage level one setup time prior to the low–to–high LEXX transition.
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.
March 11, 1993
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