SN74LS640N datasheet(3/3 Pages) MOTOROLA

Part #	SN74LS640N

Description	OCTAL BUS TRANSCEIVERS

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Manufacturer	MOTOROLA [Motorola, Inc]

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5-3

FAST AND LS TTL DATA

SN54/74LS641

• SN54/74LS642

GUARANTEED OPERATING RANGES

Symbol

Parameter

Min

Typ

Max

Unit

VCC

Supply Voltage

54

74

4.5

4.75

5.0

5.5

5.25

V

TA

Operating Ambient Temperature Range

54

74

– 55

0

25

125

70

°C

VOH

Output Current — High

54, 74

5.5

V

IOL

Output Current — Low

54

74

12

24

mA

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)

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

0.5

V

Guaranteed Input LOW Voltage for

All Inputs

VIL

Input LOW Voltage

74

0.6

V

Guaranteed Input LOW Voltage for

All Inputs

VIK

Input Clamp Diode Voltage

– 0.65

– 1.5

V

VCC = MIN, IIN = – 18 mA

IOH

Output HIGH Current

54, 74

100

µA

VCC = MIN, VOH = 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

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

– 0.4

mA

VCC = MAX, VIN = 0.4 V

ICC

Power Supply Current

Total, Output HIGH

70

mA

VCC = MAX

ICC

Total, Output LOW

90

mA

VCC = MAX

Total at HIGH Z

95

AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V)

Symbol

Parameter

Limits

Unit

Test Conditions

Symbol

Parameter

LS641

LS642

Unit

Test Conditions

Symbol

Parameter

Min

Typ

Max

Min

Typ

Max

Unit

Test Conditions

tPLH

tPHL

Propagation Delay,

A to B

17

16

25

19

14

25

ns

CL = 45 pF,

RL = 667 Ω

tPLH

tPHL

Propagation Delay,

B to A

17

16

25

19

14

25

ns

CL = 45 pF,

RL = 667 Ω

tPLH

tPHL

Propagation Delay,

G, DIR to A

23

34

40

50

26

43

40

60

ns

CL = 45 pF,

RL = 667 Ω

tPLH

tPHL

Propagation Delay,

G, DIR to B

25

37

40

50

28

39

40

60

ns

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