74F8960 Datasheet, PDF (5/11 Pages) NXP Semiconductors – Octal latched bidirectional Futurebus transceivers 3-State open-collector

Philips Semiconductors FAST Products
Octal latched bidirectional Futurebus transceivers
(3-State + open-collector)
Product specification
74F8960/74F8961
FUNCTION TABLE FOR 74F8960
INPUTS
LATCH OUTPUTS
OPERATING MODE
An Bn* LE OEA OEB OEB
0
1
HX L
L
L
L
STATE
H
An Bn
Z L A 3–state, data from A to B
LXL
L
L
L
L
Z H**
XXH
L
L
L
Qn
Z Qn A 3–state, latched data to B
––L
H
L
L
(1)
(1) (1) Feedback: A to B, B to A
– HH
H
L
L
H (2)
H Z(2) Preconditioned latch enabling data transfer from B to A
– LH
H
L
L
H (2)
L Z(2)
– –H
H
L
L
Qn
Qn Qn Latch state to A and B
HX L
L
H
X
H
ZZ
l XL
L
H
X
l
Z Z B and A 3–state
XXH
L
H
X
Qn
ZZ
–HL
H
H
X
H
HZ
–LL
H
H
H
L
L Z B 3–state, data from B to A
– HH
H
H
H
Qn
HZ
– LH
H
H
H
Qn
LZ
HX L
L
X
H
H
ZZ
l XL
L
X
H
l
Z Z B and A 3–state
XXH
L
X
H
Qn
ZZ
–HL
H
X
H
H
HZ
–LL
H
X
H
L
L Z B 3–state, data from B to A
– HH
H
X
H
Qn
HZ
– LH
H
X
H
Qn
LZ
NOTES:
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. Q_n = High or low voltage level one setup time prior to the low–to–high LE transition.
7. (1) = Condition will cause a feedback loop path: A to B and B to A.
8. (2) = The latch must be preconmditioned such that B inputs may assume a high or low level while OEB0 and OEB1 are low and LE is high.
9. H**= Goes to level of pullup voltage.
10. B* = Precaution should be taken to insure the B inputs do not float. If they do they are equal to low state.
December 19, 1990
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