74ALVCH16821DGG datasheet(8/12 Pages) PHILIPS

Teilenummer	74ALVCH16821DGG

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

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Hersteller	PHILIPS [NXP Semiconductors]

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Philips Semiconductors

Product specification

74ALVCH16821

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

positive-edge trigger (3-State)

1998 May 29

8

AC WAVEFORMS

VCC = 2.3 TO 2.7 V RANGE

1. VM = 0.5 V

2. VX = VOL + 0.15V

3. VY = VOH – 0.15V

4. VI = VCC

5. VOL and VOH are the typical output voltage drop that occur with

the output load.

VCC = 3.0 TO 3.6 V RANGE AND VCC = 2.7 V

1. VM = 1.5 V

2. VX = VOL + 0.3V

3. VY = VOH – 0.3V

4. VI = 2.7 V

5. VOL and VOH are the typical output voltage drop that occur with

the output load.

VM

nCP INPUT

nQn OUTPUT

tw

tPHL

VM

tPLH

1/fMAX

VM

VOH

VOL

SH00128

VI

GND

Waveform 1.

The input (nCP) to output propagation delays.

tPLZ

tPZL

VI

nOE INPUT

GND

VCC

OUTPUT

LOW-to-OFF

OFF-to-LOW

VOL

VOH

OUTPUT

HIGH-to-OFF

OFF-to-HIGH

GND

outputs

enabled

outputs

enabled

outputs

disabled

tPHZ

VM

tPZH

VX

VY

SW00308

Waveform 2. The 3-State enable and disable times.

nQn OUTPUT

VM

nDn INPUT

SH00129

nCP INPUT

VM

GND

VI

GND

VI

VOL

VOH

tsu

th

Waveform 3. Set up and hold times.

TEST CIRCUIT

SWITCH POSITION

PULSE

GENERATOR

RT

VI

D.U.T.

VO

CL

VCC

RL = 500 Ω

Test Circuit for switching times

Open

GND

S1

DEFINITIONS

VCC

VI

< 2.7V

VCC

TEST

S1

tPLH/tPHL

Open

RL = Load resistor

CL = Load capacitance includes jig and probe capacitance

RT = Termination resistance should be equal to ZOUT of pulse generators.

2

< VCC

tPLZ/tPZL

2.7V

2.7–3.6V

tPHZ/tPZH

GND

RL = 500 Ω

2 * VCC

SV00906

Waveform 4. Load circuitry for switching times

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