74FCT621T_16 datasheet(5/6 Pages) IDT

No. de pieza	74FCT621T

Descripción Electrónicos	FAST CMOS OCTAL BUS TRANSCEIVER

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Fabricante Electrónico	IDT [Integrated Device Technology]

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INDUSTRIALTEMPERATURERANGE

IDT74FCT621T/AT

FASTCMOSOCTALBUSTRANSCEIVER(OPENDRAIN)

5

Pulse

Generator

R T

D.U.T

.

V CC

VIN

C L

VOUT

50pF

500W

7.0V

3V

1.5V

0V

3V

1.5V

0V

3V

1.5V

0V

3V

1.5V

0V

DATA

INPUT

TIMING

INPUT

ASYNCHRONOUS CONTROL

PRESET

CLEAR

ETC.

SYNCHRONOUS CONTROL

tSU

tH

tREM

tSU

tH

HIGH-LOW-HIGH

PULSE

LOW-HIGH-LOW

PULSE

tW

1.5V

SAME PHASE

INPUT TRANSITION

3V

1.5V

0V

1.5V

VOH

tPLH

OUTPUT

OPPOSITE PHASE

INPUT TRANSITION

3V

1.5V

0V

tPLH

tPHL

VOL

CONTROL

INPUT

3V

1.5V

0V

3.5V

0V

OUTPUT

NORMALLY

LOW

OUTPUT

NORMALLY

HIGH

SWITCH

CLOSED

SWITCH

OPEN

VOL

0.3V

tPLZ

tPZL

tPZH

tPHZ

3.5V

0V

1.5V

ENABLE

DISABLE

VOH

PRESET

CLEAR

CLOCK ENABLE

ETC.

Octal Link

TEST CIRCUITS AND WAVEFORMS

Propagation Delay

Test Circuits for All Outputs

Enable and Disable Times

Set-Up, Hold, and Release Times

Pulse Width

NOTES:

1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.

2. Pulse Generator for All Pulses: Rate

≤ 1.0MHz; tF ≤ 2.5ns; tR ≤ 2.5ns.

Test

Switch

Open Drain

Disable Low

Closed

Enable Low

All Other Tests

Open

SWITCH POSITION

DEFINITIONS:

CL = Load capacitance: includes jig and probe capacitance.

RT = Termination resistance: should be equal to ZOUT of the Pulse Generator.

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