SN74LS256N データシートの表示（PDF） - Motorola => Freescale
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SN74LS256N Datasheet PDF : 6 Pages
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SN54 / 74LS256
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
VIH
Input HIGH Voltage
2.0
Guaranteed Input HIGH Voltage for
V
All Inputs
54
VIL
Input LOW Voltage
74
0.7
Guaranteed Input LOW Voltage for
0.8
V
All Inputs
VIK
VOH
VOL
Input Clamp Diode Voltage
– 0.65 – 1.5
V
VCC = MIN, IIN = – 18 mA
Output HIGH Voltage
54, 74 2.4
3.5
V
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
Output LOW Voltage
54, 74
74
0.25 0.4
0.35 0.5
V
IOL = 4.0 mA
VCC = VCC MIN,
VIN = VIL or VIH
V
IOL = 8.0 mA
per Truth Table
Input HIGH Current
Others
IIH
E Input
Others
E Input
20
µA VCC = MAX, VIN = 2.7 V
40
0.1
0.2
mA VCC = MAX, VIN = 7.0 V
Input LOW Current
IIL
Others
E Input
– 0.4
– 0.8
mA VCC = MAX, VIN = 0.4 V
IOS
Short Circuit Current (Note 1)
– 20
– 100 mA VCC = MAX
ICC
Power Supply Current
30
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
mA VCC = MAX
AC CHARACTERISTICS (TA = 25°C)
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPHL
Parameter
Turn-Off Delay, Enable to Output
Turn-On Delay, Enable to Output
Turn-Off Delay, Data to Output
Turn-On Delay, Data to Output
Turn-Off Delay, Address to Output
Turn-On Delay, Address to Output
Turn-On Delay, Clear to Output
Limits
Min Typ Max Unit
20
27
ns
16
24
ns
20
30
ns
13
20
ns
20
30
ns
14
24
ns
12
23
ns
Test Conditions
Figure 1
Figure 2
Figure 3
Figure 5
VCC = 5.0 V,
CL = 15 pF
FAST AND LS TTL DATA
5-423
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