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參數(shù)資料
| 型號： | 74F777 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Triple bidirectional latched bus transceiver (3-State + open collector)(三通道雙向鎖存總線收發(fā)器（三態(tài)+集電極開路）) |
| 中文描述： | 三鎖存總線雙向收發(fā)器（3態(tài)集電極開路）（三通道雙向鎖存總線收發(fā)器（三態(tài)集電極開路）） |
| 文件頁數(shù)： | 4/12頁 |
| 文件大?。?/td> | 98K |
| 代理商： | 74F777 |
Philips Semiconductors
Product specification
74F777
Triple bidirectional latched bus transceiver (3–State +
Open Collector)
May 19, 1992
4
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
Qn
L
Z
Notes to function table
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
V
X
V
IN
Supply voltage
–0.5 to +7.0
V
Threshold control
–0.5 to +7.0
V
Input voltage
OEBn, OEAn, LEn
–0.5 to +7.0
V
A0
– A2, B0
– B2
–0.5 to +5.5
V
I
IN
V
OUT
Input current
–30 to +5
mA
Voltage applied to output in High output state
–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
Operating free air
Commercial range
0 to +70
°
C
°
C
°
C
temperature range
Industrial range
–40 to +85
T
stg
Storage temperature range
–65 to +150
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