參數(shù)資料
型號: TC74VHC257FK
廠商: Toshiba Corporation
英文描述: Quad 2-Channel Multiplexer (3-state)
中文描述: 四2通道多路復(fù)用器(3態(tài))
文件頁數(shù): 5/10頁
文件大小: 271K
代理商: TC74VHC257FK
TC74VHC257F/FN/FT/FK
2007-10-01
5
AC Characteristics
(input: t
r
= t
f
= 3 ns)
Test Condition
Ta = 25°C
Ta =
40 to
85°C
Characteristics
Symbol
V
CC
(V)
C
L
(pF)
Min
Typ.
Max
Min
Max
Unit
15
5.8
9.3
1.0
11.0
3.3 ± 0.3
50
8.3
12.8
1.0
14.5
15
3.6
5.9
1.0
7.0
Propagation delay
time
(A, B-Y)
t
pLH
t
pHL
5.0 ± 0.5
50
5.1
7.9
1.0
9.0
ns
15
7.0
11.0
1.0
13.0
3.3 ± 0.3
50
9.5
14.5
1.0
16.5
15
4.0
6.8
1.0
8.0
Propagation delay
time
(SELECT-Y)
t
pLH
t
pHL
5.0 ± 0.5
50
5.5
8.8
1.0
10.0
ns
15
6.7
10.5
1.0
12.5
3.3 ± 0.3
50
9.2
14.0
1.0
16.0
15
3.6
6.8
1.0
8.0
3-state output enable
time
t
pZL
t
pZH
R
L
= 1 k
5.0 ± 0.5
50
5.1
8.8
1.0
10.0
ns
3.3 ± 0.3
50
8.6
12.0
1.0
13.5
3-state output disable
time
t
pLZ
t
pHZ
R
L
= 1 k
5.0 ± 0.5
50
5.7
7.9
1.0
9.0
ns
Input capacitance
C
IN
4
10
10
pF
Onput capacitance
C
OUT
6
pF
Power dissipation
capacitance
C
PD
(Note)
23
pF
Note: C
PD
is defined as the value of the internal equivalent capacitance which is calculated from the operating
current consumption without load.
Average operating current can be obtained by the equation:
I
CC (opr)
= C
PD
·V
CC
·f
IN
+ I
CC
/4 (per bit)
Noise Characteristics
(input: t
r
= t
f
= 3 ns)
Test Condition
Ta = 25°C
Characteristics
Symbol
V
CC
(V)
Typ.
Max
Unit
Quiet output maximum dynamic V
OL
V
OLP
C
L
= 50 pF
5.0
0.3
0.8
V
Quiet output minimum dynamic V
OL
V
OLV
C
L
= 50 pF
5.0
0.3
0.8
V
Minimum high level dynamic input voltage
V
IHD
C
L
= 50 pF
5.0
3.5
V
Maximum low level dynamic input voltage
V
ILD
C
L
= 50 pF
5.0
1.5
V
Input Equivalent Circuit
INPUT
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