5-2

FAST AND LS TTL DATA

SN54/74LS640

• SN54/74LS645

GUARANTEED OPERATING RANGES

Symbol

Parameter

Min

Typ

Max

Unit

VCC

Supply Voltage

54

74

4.5

4.75

5.0

5.0

5.5

5.25

V

TA

Operating Ambient Temperature Range

54

74

– 55

0

25

25

125

70

°C

IOH

Output Current — High

54, 74

– 3.0

mA

OH

54

74

–12

–15

mA

IOL

Output Current — Low

54

74

12

24

mA

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

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

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

– 400

µA

VCC = MAX, VOUT = 0.4 V

IIH

Input HIGH Current

A or B, DIR or G

20

µA

VCC = MAX, VIN = 2.7 V

IIH

Input HIGH Current

DIR or G

0.1

mA

VCC = MAX, VIN = 7.0 V

IH

A or B

0.1

mA

VCC = MAX, VIN = 5.5 V

IIL

Input LOW Current

– 0.4

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

70

mA

VCC = MAX

ICC

Total, Output LOW

90

mA

VCC = MAX

Total at HIGH Z

95

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

LS640

LS645

Unit

Test Conditions

Symbol

Parameter

Min

Typ

Max

Min

Typ

Max

Unit

Test Conditions

tPLH

tPHL

Propagation Delay

A to B

6.0

8.0

10

15

8.0

11

15

15

ns

CL = 45 pF,

RL = 667 Ω

tPLH

tPHL

Propagation Delay

B to A

6.0

8.0

10

15

8.0

11

15

15

ns

CL = 45 pF,

RL = 667 Ω

tPZL

tPZH

Output Enable Time

G, DIR to A

31

23

40

40

31

26

40

40

ns

CL = 45 pF,

RL = 667 Ω

tPZL

tPZH

Output Enable Time

G, DIR to B

31

23

40

40

31

26

40

40

ns

tPLZ

tPHZ

Output Disable Time

G, DIR to A

15

15

25

25

15

15

25

25

ns

CL = 5.0 pF

tPLZ

tPHZ

Output Disable Time

G, DIR to B

15

15

25

25

15

15

25

25

ns

CL = 5.0 pF