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參數(shù)資料
| 型號： | PI74FCT238T |
| 廠商： | Pericom Semiconductor Corp. |
| 英文描述： | Fast CMOS 1-of-8 Decoder |
| 中文描述： | 快速CMOS 1 - 8解碼器 |
| 文件頁數(shù)： | 5/6頁 |
| 文件大?。?/td> | 55K |
| 代理商： | PI74FCT238T |
5
PS2004A 03/09/96
PI74FCT138/238T
1-OF-8 DECODER
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Power Supply Characteristics
Parameters Description
Test Conditions
(1)
Min.
Typ
(2)
Max.
Units
I
CC
Quiescent Power
Supply Current
V
CC
= Max.
V
IN
= GND
or V
CC
0.1
500
μA
I
CC
Supply Current per
Input @ TTL HIGH
V
CC
= Max.
V
IN
= 3.4V
(3)
0.5
2.0
mA
I
CCD
Supply Current per
Input per MHz
(4)
V
CC
= Max., Outputs Open
One Input Toggling
50% Duty Cycle
V
IN
= V
CC
V
IN
= GND
0.15
0.3
mA/
MHz
I
C
Total Power Supply
Current
(6)
V
CC
= Max., Outputs Open
f
CP
= 10 MH
Z
, 50% Duty Cycle
Toggle E
1
, E
2
, or E
3
One Bit toggling
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4V
V
IN
= GND
1.5
4.0
(5)
mA
1.8
5.0
(5)
Notes:
1. Fo Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at Vcc = 5.0V, +25°C ambient.
3. Per TTL driven input (V
IN
= 3.4V); all other inputs at Vcc or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested.
6. I
C
=I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
I
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
I
N
I
)
I
CC
= Quiescent Current
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
H
I
CCD
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f
CP
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
fo = Output Frequency
No = Number of Outputs at fo
All currents are in milliamps and all frequencies are in megahertz.
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