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參數(shù)資料
| 型號： | 935024270112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 總線收發(fā)器 |
| 英文描述： | F/FAST SERIES, TRIPLE 1-BIT REGISTERED TRANSCEIVER, TRUE OUTPUT, PDIP20 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-20 |
| 文件頁數(shù)： | 7/12頁 |
| 文件大?。?/td> | 108K |
| 代理商： | 935024270112 |
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
H
Z
H**
A 3-State, data from A to B
L
X
L
Z
L
X
H
L
Qn
Z
Qn
A 3-State, latched data to B
–
L
H
L
(1)
Feedback: A to B, B to A
–
H
L
H (2)
H
Z(2)
Preconditioned latch enabling
–
L
H
L
H (2)
L
Z(2)
data transfer from B to A
–
H
L
Qn
Latch state to A and B
H
X
L
H
Z
L
X
L
H
L
Z
B and A 3–State
X
H
L
H
Qn
Z
–
H
L
H
Z
–
L
H
L
Z
B 3-State, data from B to A
–
H
Qn
H
Z
–
L
H
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
Qn = 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.
Bn*
=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
VCC
Supply voltage
–0.5 to +7.0
V
VX
Threshold control
–0.5 to +7.0
V
VIN
Input voltage
OEBn, OEAn, LEn
–0.5 to +7.0
V
A0 – A2, B0 – B2
–0.5 to +5.5
V
IIN
Input current
–30 to +5
mA
VOUT
Voltage applied to output in High output state
–0.5 to VCC
V
IOUT
Current applied to output in
A0 – A2
48
mA
Low output state
B0 – B2
200
mA
Tamb
Operating free air
Commercial range
0 to +70
°C
temperature range
Industrial range
–40 to +85
°C
Tstg
Storage temperature range
–65 to +150
°C
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