74F777 Datasheet, PDF (4/12 Pages) NXP Semiconductors – Triple bidirectional latched bus transceiver 3-State open collector

Philips Semiconductors
Triple bidirectional latched bus transceiver (3–State +
Open Collector)
Product specification
74F777
FUNCTION TABLE
INPUTS
LATCH
OUTPUTS
OPERATING MODE
An Bn* LEn OEAn OEBn
STATE
An
Bn
H
X
L
L
L
H
Z
H** A 3-State, data from A to B
L
X
L
L
L
L
Z
L
X
X
H
L
L
Qn
Z
Qn A 3-State, latched data to B
–
–
L
H
L
(1)
(1)
(1) Feedback: A to B, B to A
–
H
H
H
L
H (2)
H
Z(2) Preconditioned latch enabling
–
L
H
H
L
H (2)
L
Z(2) data transfer from B to A
–
–
H
H
L
Qn
Qn
Qn Latch state to A and B
H
X
L
L
H
H
Z
Z
L
X
L
L
H
L
Z
Z B and A 3–State
X
X
H
L
H
Qn
Z
Z
–
H
L
H
H
H
H
Z
–
L
L
H
H
L
L
Z B 3-State, data from B to A
–
H
H
H
H
Qn
H
Z
–
L
H
H
H
Qn
L
Z
Notes to function table
Qn
H = High voltage level
L = Low voltage level
X = Don’t care
– = Input not externally driven
Z = High impedance (off) state
Q_n = High or Low voltage level one setup time prior to the Low–to–High LE transition.
(1) = Condition will cause a feedback loop path: A to B and B to A.
(2) = The latch must be preconditioned such that B inputs may assume a High or Low level while OEB0 and OEB1 are Low and LE is High.
B_n* =Precaution should be taken to insure the B inputs do not float. If they do they are equal to Low state.
H**= Goes to level of pull-up voltage.
Each latch is independent. The latches may be run in any combination of modes.
ABSOLUTE MAXIMUM RATINGS
(Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the
operating free air temperature range.)
SYMBOL
PARAMETER
RATING
UNIT
V_CC
Supply voltage
V_X
Threshold control
V_IN
Input voltage
OEBn, OEAn, LEn
A0 – A2, B0 – B2
–0.5 to +7.0
V
–0.5 to +7.0
V
–0.5 to +7.0
V
–0.5 to +5.5
V
I_IN
V_OUT
Input current
Voltage applied to output in High output state
–30 to +5
mA
–0.5 to V_CC
V
I_OUT
Current applied to output in
A0 – A2
48
mA
Low output state
B0 – B2
200
mA
T_amb
T_stg
Operating free air
temperature range
Storage temperature range
Commercial range
Industrial range
0 to +70
°C
–40 to +85
°C
–65 to +150
°C
May 19, 1992
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