參數(shù)資料
型號: CY74FCT138TDIP
廠商: Texas Instruments, Inc.
英文描述: 1-of-8 Decoder
中文描述: 1 - 8解碼器
文件頁數(shù): 3/6頁
文件大?。?/td> 155K
代理商: CY74FCT138TDIP
CY54/74FCT138T
3
Capacitance
[6]
Parameter
Description
Typ.
[5]
5
9
Max.
10
12
Unit
pF
pF
C
IN
C
OUT
Input Capacitance
Output Capacitance
Power Supply Characteristics
Parameter
I
CC
Description
Test Conditions
Typ.
[5]
0.1
Max.
0.2
Unit
mA
Quiescent Power Supply Current
V
CC
=Max., V
IN
<
0.2V,
V
IN
>
V
CC
–0.2V
V
CC
=Max., V
IN
=3.4V,
[8]
f
1
=0, Outputs Open
V
CC
=Max., One Input Toggling,
50% Duty Cycle, Outputs Open,
V
IN
<
0.2V or V
IN
>
V
CC
–0.2V
V
CC
=Max., f
1
=10 MHz,
50% Duty Cycle, Outputs Open, Toggle
E
1
,
E
2
, or E
3
,
One Output Toggling
,
V
IN
<
0.2V or V
IN
>
V
CC
–0.2V
V
CC
=Max., f
1
=10 MHz,
50% Duty Cycle, Outputs Open, Toggle
E
1
,
E
2
, or E
3
,
One Output Toggling,
V
IN
=3.4V or V
IN
=GND
I
CC
Quiescent Power Supply Current
(TTL inputs)
Dynamic Power Supply
Current
[9]
0.5
2.0
mA
I
CCD
0.06
0.12
mA/MHz
I
C
Total Power Supply Current
[10]
0.7
1.4
mA
1.0
2.4
mA
Notes:
8.
9.
10. I
C
Per TTL driven input (V
=3.4V); all other inputs at V
or GND.
This parameter is not directly testable, but is derived for use in Total Power Supply calculations.
=
I
QUIESCENT
+ I
INPUTS
+ I
I
C
=
I
D
N
(f
/2 + f
N
)
I
CC
=
Quiescent Current with CMOS input levels
I
CC
=
Power Supply Current for a TTL HIGH input (V
IN
=3.4V)
D
H
=
Duty Cycle for TTL inputs HIGH
N
T
= Number of TTL inputs at D
I
CCD
= Dynamic Current caused by an input transition pair (HLH or LHL)
f
0
=
Clock frequency for registered devices, otherwise zero
f
1
=
Input signal frequency
N
=
Number of inputs changing at f
All currents are in milliamps and all frequencies are in megahertz.
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