74LS155 datasheet(4/6 Pages) MOTOROLA

Part #	74LS155

Description	DUAL 1-OF-4 DECODER/ DEMULTIPLEXER

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Manufacturer	MOTOROLA [Motorola, Inc]

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4 / 6 page

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FAST AND LS TTL DATA

SN54/74LS156

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 Voltage — High

54, 74

5.5

V

IOL

Output Current — Low

54

74

4.0

8.0

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

0.7

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

IOH

Output HIGH Current

54, 74

100

µA

VCC = MIN, VOH = MAX

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

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

10

mA

VCC = MAX

AC CHARACTERISTICS (TA = 25°C)

Symbol

Parameter

Limits

Unit

Test Conditions

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

tPLH

tPHL

Propagation Delay

Address, Ea or Eb to Output

25

34

40

51

ns

Figure 1

VCC = 5.0 V

CL = 15 pF

RL = 2.0 kΩ

tPLH

tPHL

Propagation Delay

Address to Output

31

34

46

51

ns

Figure 2

VCC = 5.0 V

CL = 15 pF

RL = 2.0 kΩ

tPLH

tPHL

Propagation Delay

Ea to Output

32

48

ns

Figure 1

RL = 2.0 kΩ

AC WAVEFORMS

Figure 1

Figure 2

VIN

VOUT

1.3 V

tPHL

1.3 V

tPLH

VIN

VOUT

1.3 V

tPHL

1.3 V

tPLH

1.3 V

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