SN54LS170 datasheet(4/4 Pages) MOTOROLA

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5-4

FAST AND LS TTL DATA

SN54/74LS170

AC CHARACTERISTICS (TA = 25°C)

Symbol

Parameter

Limits

Unit

Test Conditions

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

tPLH

tPHL

Propagation Delay, Negative-

Going ER to Q Outputs

Figure 1

VCC = 5.0 V

CL = 15 pF

RL = 2.0 kΩ

tPLH

tPHL

Propagation Delay, RA or RB

to Q Outputs

Figure 2

VCC = 5.0 V

CL = 15 pF

RL = 2.0 kΩ

tPLH

tPHL

Propagation Delay, Negative-

Going EW to Q Outputs

Figure 1

CL = 15 pF

RL = 2.0 kΩ

tPLH

tPHL

Propagation Delay, Data Inputs

to Q Outputs

Figure 1

AC SETUP REQUIREMENTS (TA = 25°C)

Symbol

Parameter

Limits

Unit

Test Conditions

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

Pulse Width, ER, EW

VCC = 5.0 V

RL = 2.0 kΩ

Setup Time, Data to EW

VCC = 5.0 V

RL = 2.0 kΩ

Setup Time, WA, WB to EW

VCC = 5.0 V

RL = 2.0 kΩ

Hold Time, Data to EW

VCC = 5.0 V

RL = 2.0 kΩ

Hold Time, WA, WB to EW

5.0

tLATCH

Latch Time

VOLTAGE WAVEFORMS

Figure 1

Figure 2

WRITE-SELECT

INPUT WA or WB

DATA INPUT

D1, D2, D3 or D4

WRITE-ENABLE

INPUT EW

READ-SELECT

INPUT RA or RB

READ-ENABLE

INPUT ER

OUTPUT

Q1, Q2, Q3 or Q4

Vref

3 V

0 V

3 V

0 V

VOH

VOL

tPHL

tPLH

3 V

0 V

3 V

0 V

VOH

VOL

0 V

DATA INPUT

D1, D2, D3 or D4

WRITE-ENABLE

INPUT EW

OUTPUT

Q1, Q2, Q3 or Q4

DATA INPUT

D1, D2, D3 or D4

WRITE-ENABLE

INPUT EW

OUTPUT

Q1, Q2, Q3 or Q4

tsu(W)

th(W)

th(D)

tsu(D)

tPHL

tPLH

tPHL

tlatch

Vref

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