5-87

FAST AND LS TTL DATA

SN54/74LS85

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

2.5

3.5

V

VCC = MIN, IOH = MAX, VIN = VIH

or VIL per Truth Table

VOH

Output HIGH Voltage

54

2.5

3.5

V

VCC = MIN, IOH = MAX, VIN = VIH

or VIL per Truth Table

VOH

Output HIGH Voltage

74

2.7

3.5

V

VCC = MIN, IOH = MAX, VIN = VIH

or VIL per Truth Table

VOL

Output LOW Voltage

54, 74

0.25

0.4

V

IOL = 4.0 mA

VCC = VCC MIN,

VIN = VIL or VIH

per Truth Table

VOL

Output LOW Voltage

74

0.35

0.5

V

IOL = 8.0 mA

VIN = VIL or VIH

per Truth Table

IIH

Input HIGH Current

A < B, A > B

Other Inputs

20

60

µA

VCC = MAX, VIN = 2.7 V

IIH

A < B, A > B

Other Inputs

0.1

0.3

mA

VCC = MAX, VIN = 7.0 V

IIL

Input LOW Current

A < B, A > B

Other Inputs

– 0.4

– 1.2

mA

VCC = MAX, VIN = 0.4 V

IOS

Output Short Circuit Current (Note 1)

– 20

–100

mA

VCC = MAX

ICC

Power Supply Current

20

mA

VCC = MAX

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

Any A or B to A < B, A > B

24

20

36

30

ns

VCC = 5.0 V

CL = 15 pF

tPLH

tPHL

Any A or B to A = B

27

23

45

45

ns

VCC = 5.0 V

CL = 15 pF

tPLH

tPHL

A < B or A = B to A > B

14

11

22

17

ns

VCC = 5.0 V

CL = 15 pF

tPLH

tPHL

A = B to A = B

13

13

20

26

ns

tPLH

tPHL

A > B or A = B to A < B

14

11

22

17

ns

Figure 3

Figure 4

AC WAVEFORMS

VIN

VOUT

1.3 V

tPHL

1.3 V

1.3 V

1.3 V

tPLH

VIN

VOUT

1.3 V

tPHL

1.3 V

1.3 V

1.3 V

tPLH