SN74LS640 查看數據表（PDF） - ON Semiconductor
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SN74LS640 Datasheet PDF : 8 Pages
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SN74LS640 SN74LS641 SN74LS642 SN74LS645
SN74LS641 • SN74LS642
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
VIH
Input HIGH Voltage
2.0
Guaranteed Input HIGH Voltage for
V
All Inputs
VIL
Input LOW Voltage
0.6
V
Guaranteed Input LOW Voltage for
All Inputs
VIK
Input Clamp Diode Voltage
IOH
Output HIGH Current
VOL
Output LOW Voltage
IIH
Input HIGH Current
IIL
Input LOW Current
Power Supply Current
Total, Output HIGH
ICC
Total, Output LOW
– 0.65 – 1.5
V
VCC = MIN, IIN = – 18 mA
100
µA VCC = MIN, VOH = MAX
0.25 0.4
0.35 0.5
V
IOL = 12 mA
V
IOL = 24 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
20
µA VCC = MAX, VIN = 2.7 V
–0.1 mA VCC = MAX, VIN = 7.0 V
– 0.4 mA VCC = MAX, VIN = 0.4 V
70
90
mA VCC = MAX
Total at HIGH Z
95
AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V)
Limits
LS641
LS642
Symbol
Parameter
Min Typ Max Min Typ Max Unit
tPLH
Propagation Delay,
tPHL
A to B
17 25
16 25
19
14
25
25
ns
tPLH
Propagation Delay,
tPHL
B to A
17 25
16 25
19
14
25
25
ns
tPLH
Propagation Delay,
tPHL
G, DIR to A
23 40
34 50
26
43
40
60
ns
tPLH
Propagation Delay,
tPHL
G, DIR to B
25 40
37 50
28
39
40
60
ns
Test Conditions
CL = 45 pF,
RL = 667 Ω
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