SN74LS257BDR2 查看數據表（PDF） - ON Semiconductor
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SN74LS257BDR2 Datasheet PDF : 8 Pages
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SN74LS257B, SN74LS258B
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
VIH
Parameter
Input HIGH Voltage
Min Typ Max Unit
Test Conditions
Guaranteed Input HIGH Voltage for
2.0
V
All Inputs
VIL
Input LOW Voltage
0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VIK
VOH
VOL
IOZH
IOZL
IIH
Input Clamp Diode Voltage
Output HIGH Voltage
Output LOW Voltage
Output Off Current — HIGH
Output Off Current — LOW
Input HIGH Current
Other Inputs
S Inputs
Other Inputs
S Inputs
–0.65 –1.5
V
VCC = MIN, IIN = –18 mA
2.4
3.1
V
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
0.25 0.4
0.35 0.5
V
IOL = 12 mA
VCC = VCC MIN,
VIN = VIL or VIH
V
IOL = 24 mA
per Truth Table
20
µA VCC = MAX, VOUT = 2.7 V
–20
µA VCC = MAX, VOUT = 0.4 V
20
µA VCC = MAX, VIN = 2.7 V
40
0.1
0.2
mA VCC = MAX, VIN = 7.0 V
IIL
Input LOW Current
All Inputs
–0.4 mA VCC = MAX, VIN = 0.4 V
IOS
Short Circuit Current (Note 2)
–30
Power Supply Current
Total, Output HIGH
LS257B
LS258B
–130 mA VCC = MAX
10
mA
9.0
ICC
Total, Output LOW
LS257B
LS258B
16
14
mA VCC = MAX
Total, Output 3-State
LS257B
LS258B
19
16
mA
2. Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V) See SN74LS251 for Waveforms
Limits
Symbol
Parameter
Min Typ Max Unit
tPLH
tPHL
Propagation Delay, Data to Output
10
13
12
15
ns
tPLH
tPHL
Propagation Delay, Select to Output
14
14
21
21
ns
tPZH
Output Enable Time to HIGH Level
20
25
ns
tPZL
Output Enable Time to LOW Level
20
25
ns
tPLZ
Output Disable Time to LOW Level
16
25
ns
tPHZ
Output Disable Time from HIGH Level
18
25
ns
Test Conditions
Figures 1 & 2
Figures 1 & 2
CL = 45 pF
Figures 4 & 5
Figures 3 & 5
Figures 3 & 5
Figures 4 & 5
CL = 45 pF
RL = 667 Ω
CL = 5.0 pF
RL = 667 Ω
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