74F298 datasheet(5/8 Pages) PHILIPS

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Philips Semiconductors

Product specification

74F298

Quad 2-input multiplexer with storage

1989 Aug 14

AC SETUP REQUIREMENTS

LIMITS

SYMBOL

PARAMETER

TEST

CONDITION

Tamb = +25°C

VCC = +5.0V

CL = 50pF

RL = 500Ω

Tamb = 0°C to +70°C

VCC = +5.0V ± 10%

CL = 50pF

RL = 500Ω

UNIT

MIN

TYP

MAX

MIN

MAX

ts(H)

ts(L)

Setup time, High or Low

I0n, I1n to CP

Waveform

NO TAG

2.0

th(H)

th(L)

Hold time, High or Low

I0n, I1n to CP

Waveform

NO TAG

1.0

ts(H)

ts(L)

Setup time, High or Low

S to CP

Waveform

NO TAG

6.0

5.0

7.0

6.0

th(H)

th(L)

Hold time, High or Low

S to CP

Waveform

NO TAG

tw(H)

tw(L)

CP Pulse width,

High or Low

Waveform

NO TAG

5.0

7.0

AC WAVEFORMS

For all waveforms, VM = 1.5V.

The shaded areas indicate when the input is permitted to change for predictable output performance.

1/fMAX

tW(L)

tW(H)

SF00863

tPLH

tPHL

Waveform 1.

Clock Input to Output, Clock Pulse Width, and

Maximum Clock Frequency

th(H)

th(L)

Ion, I1n, S

ts(L)

ts(H)

SF00864

Waveform 2.

Data Setup and Hold Times

TEST CIRCUIT AND WAVEFORMS

90%

10%

90%

10%

90%

10%

90%

10%

NEGATIVE

PULSE

POSITIVE

PULSE

AMP (V)

tTHL (tf )

INPUT PULSE REQUIREMENTS

rep. rate

tTLH

tTHL

1MHz

500ns

2.5ns

Input Pulse Definition

VCC

family

74F

D.U.T.

PULSE

GENERATOR

VIN

VOUT

Test Circuit for Totem-Pole Outputs

DEFINITIONS:

RL = Load resistor;

see AC ELECTRICAL CHARACTERISTICS for value.

CL = Load capacitance includes jig and probe capacitance;

see AC ELECTRICAL CHARACTERISTICS for value.

RT = Termination resistance should be equal to ZOUT of

pulse generators.

tTHL (tf )

tTLH (tr )

AMP (V)

amplitude

3.0V

1.5V

SF00006

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