54LS257 View Datasheet(PDF) - Motorola => Freescale
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Description
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54LS257 Datasheet PDF : 6 Pages
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SN54/74LS257B D SN54/74LS258B
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
Input Clamp Diode Voltage
54
Output HIGH Voltage
74
– 0.65 – 1.5
2.4
3.4
2.4
3.1
V VCC = MIN, IIN = – 18 mA
V VCC = MIN, IOH = MAX, VIN = VIH
V or VIL per Truth Table
VOL
Output LOW Voltage
54, 74
74
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
IOZH
IOZL
IIH
Output Off Current — HIGH
Output Off Current — LOW
Input HIGH Current
Other Inputs
S Inputs
Other Inputs
S Inputs
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 1)
– 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
Note 1: 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 SN54LS251 for Waveforms
Limits
Symbol
Parameter
Min Typ Max Unit
tPLH
tPHL
Propagation Delay, Data to Output
10
12
13
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
FAST AND LS TTL DATA
5-430
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