5-3

FAST AND LS TTL DATA

SN54/74LS170

WRITE FUNCTION TABLE (SEE NOTES A, B, AND C)

READ FUNCTION TABLE (SEE NOTES A AND D)

WRITE INPUTS

WORD

READ INPUTS

OUTPUTS

WB

WA

EW

0

1

2

3

RB

RA

ER

Q1

Q2

Q3

Q4

L

L

L

Q = D

Q0

Q0

Q0

L

L

L

W0B1

W0B2

W0B3

W0B4

L

H

L

Q0

Q = D

Q0

Q0

L

H

L

W1B1

W1B2

W1B3

W1B4

H

L

L

Q0

Q0

Q = D

Q0

H

L

L

W2B1

W2B2

W2B3

W2B4

H

H

L

Q0

Q0

Q0

Q = D

H

H

L

W3B1

W3B2

W3B3

W3B4

X

X

H

Q0

Q0

Q0

Q0

X

X

H

H

H

H

H

NOTES: A. H = HIGH Level. L = LOW Level, X = Irrelevant.

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

VOH

Output Voltage — High

54, 74

5.5

V

IOL

Output Current — Low

54

74

4.0

8.0

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

0.7

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

Any D, R, W

ER, EW

20

40

µA

VCC = MAX, VIN = 2.4 V

IIH

Any D, R, W

ER, EW

0.1

0.2

mA

VCC = MAX, VIN = 7.0 V

IIL

Input LOW Current

Any D, R, W

ER, EW

– 0.4

– 0.8

mA

VCC = MAX, VIN = 0.4 V

ICC

Power Supply Current

40

mA

VCC = MAX