74LS161 查看數據表（PDF） - System Logic Semiconductor
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74LS161 Datasheet PDF : 5 Pages
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SL74LS161
FUNCTION TABLE
Inputs
Outputs
Reset Load Enable Enable Clock Q0 Q1 Q2 Q3
P
T
Function
L
X
X
X
X
L L L L Reset to “0”
H
L
X
X
P0 P1 P2 P3 Preset Data
H
H
X
L
No change
No count
H
H
L
X
No change
No count
H
H
H
H
Count up
Count
H
X
X
X
No change
No count
X=don’t care
P0,P1,P2,P3 = logic level of Data inputs
Ripple Carry Out = Enable T • Q0 • Q1 • Q2 • Q3
MAXIMUM RATINGS*
Symbol
Parameter
Value
Unit
VCC Supply Voltage
VIN
Input Voltage
VOUT Output Voltage
Tstg Storage Temperature Range
7.0
V
7.0
V
5.5
V
-65 to +150
°C
*Maximum Ratings are those values beyond which damage to the device may occur.
Functional operation should be restricted to the Recommended Operating Conditions.
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
VCC
VIH
VIL
IOH
IOL
fclock
tw(clock)
tw(reset)
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Clock frequency
Width of clock pulse
Width of reset pulse
Data inputs P0, P1, P2, P3
tsu
Setup time
Enable P or T
Load
th
Hold time at any input
TA
Ambient Temperature Range
Min Max Unit
4.75 5.25
V
2.0
V
0.8
V
-0.4 mA
8.0
mA
0
25 MHz
25
ns
20
ns
20
20
ns
20
3
ns
0
+70
°C
SLS
System Logic
Semiconductor
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