SN74LS221N 查看數據表（PDF） - Motorola => Freescale
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SN74LS221N Datasheet PDF : 7 Pages
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SN54 / 74LS221
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA
Operating Ambient Temperature Range
IOH
Output Current — High
IOL
Output Current — Low
Min
Typ
Max
Unit
54
4.5
5.0
5.5
V
74
4.75
5.0
5.25
54
– 55
25
125
°C
74
0
25
70
54, 74
– 0.4
mA
54
4.0
mA
74
8.0
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
Positive-Going Threshold
VT+
Voltage at C Input
1.0
2.0
V VCC = MIN
Negative-Going Threshold
54
0.7
0.8
VT–
Voltage at C Input
74
0.7
0.8
V
V
VCC = MIN
VT+
Positive-Going Threshold
Voltage at B Input
1.0
2.0
V VCC = MIN
Negative-Going Threshold
54
0.7
0.9
VT–
Voltage at B Input
74
0.8
0.9
V
VCC = MIN
V
VIH
Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
A Input
54
VIL
Input LOW Voltage
74
0.7
Guaranteed Input LOW Voltage for
0.8
V A Input
VIK
VOH
Input Clamp Voltage
Output HIGH Voltage
– 1.5
V VCC = MIN, IIN = – 18 mA
54
2.5
3.4
74
2.7
3.4
V
VCC = MIN, IOH = MAX
V
54
VOL
Output LOW Voltage
74
IIH
Input HIGH Current
Input LOW Current
IIL
Input A
Input B
Clear
0.25 0.4
0.35 0.5
20
0.1
– 0.4
– 0.8
– 0.8
V IOL = 4.0 mA
V IOL = 8.0 mA
VCC = MIN
µA VCC = MAX, VIN = 2.7 V
mA VCC = MAX, VIN = 7.0 V
mA VCC = MAX, VIN = 0.4 V
IOS
Short Circuit Current (Note 1)
– 20
– 100
Power Supply Current
ICC
Quiescent
Triggered
4.7
11
19
27
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
mA VCC = MAX
mA VCC = MAX
FAST AND LS TTL DATA
5-382
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