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74LS244

Octal Buffer / Line Driver with 3-State Outputs

ON Semiconductor 

SN74LS240 SN74LS244

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

Limits

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

0.8

V

Guaranteed Input LOW Voltage for

All Inputs

VT+–VT–

VIK

VOH

VOL

IOZH

IOZL

IIH

IIL

IOS

Hysteresis

0.2

0.4

V

VCC = MIN

Input Clamp Diode Voltage

– 0.65 – 1.5

V

VCC = MIN, IIN = – 18 mA

Output HIGH Voltage

2.4

3.4

2.0

V

VCC = MIN, IOH = – 3.0 mA

V

VCC = MIN, IOH = MAX

Output LOW Voltage

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

Output Off Current HIGH

Output Off Current LOW

Input HIGH Current

20

µA VCC = MAX, VOUT = 2.7 V

– 20

µA VCC = MAX, VOUT = 0.4 V

20

µA VCC = MAX, VIN = 2.7 V

0.1

mA VCC = MAX, VIN = 7.0 V

Input LOW Current

– 0.2 mA VCC = MAX, VIN = 0.4 V

Output Short Circuit Current (Note 1) – 40

– 225 mA VCC = MAX

Power Supply Current

Total, Output HIGH

27

Total, Output LOW LS240

ICC

LS244

44

46

mA VCC = MAX

Total at HIGH Z

LS240

50

LS244

54

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)

Limits

Symbol

Parameter

Min Typ Max Unit

tPLH

Propagation Delay, Data to Output

tPHL

LS240

9.0

12

14

18

ns

tPLH

Propagation Delay, Data to Output

tPHL

LS244

12

18

12

18

ns

tPZH

Output Enable Time to HIGH Level

15

23

ns

tPZL

Output Enable Time to LOW Level

20

30

ns

tPLZ

Output Disable Time from LOW Level

tPHZ

Output Disable Time from HIGH Level

15

25

ns

10

18

ns

Test Conditions

CL = 45 pF,

RL = 667 Ω

CL = 5.0 pF,

RL = 667 Ω

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