5-389

FAST AND LS TTL DATA

SN54/74LS240

• SN54/74LS241 • SN54/74LS244

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

VT+–VT–

Hysteresis

0.2

0.4

V

VCC = MIN

VIK

Input Clamp Diode Voltage

– 0.65

– 1.5

V

VCC = MIN, IIN = – 18 mA

VOH

Output HIGH Voltage

54, 74

2.4

3.4

V

VCC = MIN, IOH = – 3.0 mA

VOH

Output HIGH Voltage

54, 74

2.0

V

VCC = MIN, IOH = MAX

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

20

µA

VCC = MAX, VIN = 2.7 V

IIH

Input HIGH Current

0.1

mA

VCC = MAX, VIN = 7.0 V

IIL

Input LOW Current

– 0.2

mA

VCC = MAX, VIN = 0.4 V

IOS

Output Short Circuit Current (Note 1)

– 40

– 225

mA

VCC = MAX

ICC

Power Supply Current

Total, Output HIGH

27

mA

VCC = MAX

ICC

Total, Output LOW

LS240

44

mA

VCC = MAX

ICC

LS241/244

46

mA

VCC = MAX

Total at HIGH Z

LS240

50

LS241/244

54

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

LS240

9.0

12

14

18

ns

CL = 45 pF,

RL = 667 Ω

tPLH

tPHL

Propagation Delay, Data to Output

LS241 / 244

12

12

18

18

ns

CL = 45 pF,

RL = 667 Ω

tPZH

Output Enable Time to HIGH Level

15

23

ns

L = 667 Ω

tPZL

Output Enable Time to LOW Level

20

30

ns

tPLZ

Output Disable Time from LOW Level

15

25

ns

CL = 5.0 pF,

RL = 667 Ω

tPHZ

Output Disable Time from HIGH Level

10

18

ns

CL = 5.0 pF,

RL = 667 Ω