參數(shù)資料
型號: 74AC257B
廠商: 意法半導體
英文描述: QUAD 2 CHANNEL MULTIPLEXER 3-STATE
中文描述: 四2通道多路復用三態(tài)
文件頁數(shù): 5/10頁
文件大小: 89K
代理商: 74AC257B
CAPACITIVE CHARACTERISTICS
Symbol
Parameter
Test Conditions
Value
Unit
V
CC
(V)
T
A
= 25
o
C
Min.
Typ.
-40 to 85
o
C
Min.
Max.
Max.
C
OUT
C
IN
C
PD
Output Capacitance
Input Capacitance
Power Dissipation
Capacitance (note 1)
1) C
PD
isdefined as the value ofthe IC’s internalequivalent capacitance which iscalculated fromtheoperating currentconsumption without load. (Refer to
Test Circuit).Average operating current can beobtained by the followingequation.I
CC
(opr) =C
PD
V
CC
f
IN
+I
CC
/n (per circuit)
5.0
5.0
5.0
8
4
pF
pF
pF
20
AC ELECTRICAL CHARACTERISTICS
(C
L
= 50 pF, R
L
= 500
, Input t
r
= t
f
=3ns)
Symbol
Parameter
Test Condition
Value
Unit
V
CC
(V)
3.3
(*)
5.0
(**)
3.3
(*)
5.0
(**)
3.3
(*)
5.0
(**)
3.3
(*)
5.0
(**)
T
A
= 25
o
C
Min.
Typ.
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
-40 to 85
o
C
Min.
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
Max.
8.5
6
10.5
7.5
9
7.5
10
9
Max.
9
7
11.5
8.5
10
8.5
11
10
t
PLH
t
PHL
Propagation Delay Time
A,B to Y
5.5
4.5
7
5.5
5.5
4.5
7
5.5
ns
t
PLH
t
PHL
Propagation Delay Time
SEL to Y
ns
t
PZL
t
PZH
Output Enable Time
ns
t
PLZ
t
PHZ
Output Disable Time
ns
(*) Voltagerange is3.3V
±
0.3V
(**) Voltagerange is5V
±
0.5V
TEST CIRCUIT
TEST
SWITCH
Open
2V
CC
Open
t
PLH
, t
PHL
t
PZL
, t
PLZ
t
PZH
, t
PHZ
C
L
=50 pFor equivalent (includes jigand probe capacitance)
R
L
=R
1
=500
or equivalent
R
T
=Z
OUT
of pulse generator (typically50
)
74AC257
5/10
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