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74ABT16821A

20-bit bus-interface D-type flip-flop; positive-edge trigger (3-State)

Philips Electronics 

Philips Semiconductors

20-bit bus-interface D-type flip-flop;

positive-edge trigger (3-State)

Product specification

74ABT16821A

74ABTH16821A

TEST CIRCUIT AND WAVEFORM

VCC

VIN

VOUT

RL

PULSE

D.U.T.

GENERATOR

RT

CL

RL

Test Circuit for 3-State Outputs

SWITCH POSITION

TEST SWITCH

tPLZ

closed

tPZL

closed

All other open

7.0V

90%

NEGATIVE

PULSE

POSITIVE

PULSE

10%

VM

10%

tW

VM

10%

tTHL (tF)

tTLH (tR)

90%

VM

90%

VM

tW

VM = 1.5V

Input Pulse Definition

90%

AMP (V)

0V

tTLH (tR)

tTHL (tF)

AMP (V)

10%

0V

DEFINITIONS

RL = Load resistor; see AC CHARACTERISTICS for value.

CL = Load capacitance includes jig and probe capacitance;

see AC CHARACTERISTICS for value.

RT = Termination resistance should be equal to ZOUT of

pulse generators.

FAMILY

INPUT PULSE REQUIREMENTS

Amplitude Rep. Rate tW

tR

tF

74ABT/H16

3.0V

1MHz 500ns 2.5ns 2.5ns

SA00018

1998 Feb 27

7

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