5-430

FAST AND LS TTL DATA

SN54/74LS257B

D SN54/74LS258B

Symbol

Parameter

Limits

Unit

Test Conditions

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

VIH

Input HIGH Voltage

2.0

V

Guaranteed Input HIGH Voltage for

All Inputs

VIL

Input LOW Voltage

54

0.7

V

Guaranteed Input LOW Voltage for

All Inputs

VIL

Input LOW Voltage

74

0.8

V

Guaranteed Input LOW Voltage for

All Inputs

VIK

Input Clamp Diode Voltage

– 0.65

– 1.5

V

VCC = MIN, IIN = – 18 mA

VOH

Output HIGH Voltage

54

2.4

3.4

V

VCC = MIN, IOH = MAX, VIN = VIH

or VIL per Truth Table

VOH

Output HIGH Voltage

74

2.4

3.1

V

VCC = MIN, IOH = MAX, VIN = VIH

or VIL per Truth Table

VOL

Output LOW Voltage

54, 74

0.25

0.4

V

IOL = 12 mA

VCC = VCC MIN,

VIN = VIL or VIH

per Truth Table

VOL

Output LOW Voltage

74

0.35

0.5

V

IOL = 24 mA

VIN = VIL or VIH

per Truth Table

IOZH

Output Off Current — HIGH

20

µA

VCC = MAX, VOUT = 2.7 V

IOZL

Output Off Current — LOW

– 20

µA

VCC = MAX, VOUT = 0.4 V

IIH

Input HIGH Current

Other Inputs

S Inputs

20

40

µA

VCC = MAX, VIN = 2.7 V

IIH

Other Inputs

S Inputs

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

– 130

mA

VCC = MAX

ICC

Power Supply Current

Total, Output HIGH

LS257B

LS258B

10

9.0

mA

VCC = MAX

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.

Symbol

Parameter

Limits

Unit

Test Conditions

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

tPLH

tPHL

Propagation Delay, Data to Output

10

12

13

15

ns

Figures 1 & 2

CL = 45 pF

tPLH

tPHL

Propagation Delay, Select to Output

14

14

21

21

ns

Figures 1 & 2

CL = 45 pF

tPZH

Output Enable Time to HIGH Level

20

25

ns

Figures 4 & 5

CL = 45 pF

RL = 667 Ω

tPZL

Output Enable Time to LOW Level

20

25

ns

Figures 3 & 5

CL = 45 pF

RL = 667 Ω

tPLZ

Output Disable Time to LOW Level

16

25

ns

Figures 3 & 5

CL = 5.0 pF

RL = 667 Ω

tPHZ

Output Disable Time from HIGH Level

18

25

ns

Figures 4 & 5

CL = 5.0 pF

RL = 667 Ω