74FCT244 datasheet(8/9 Pages) IDT

No. de pieza	74FCT244

Descripción Electrónicos	FAST CMOS OCTAL BUFFER/LINE DRIVERS

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Fabricante Electrónico	IDT [Integrated Device Technology]

Página de inicio	http://www.idt.com

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IDT54/74FCT240/244T/AT/CT/DT - 2240/2244T/AT/CT, IDT54/74FCT540/541/2541T/AT/CT

FAST CMOS OCTAL BUFFER/LINE DRIVER

MILITARY AND COMMERCIAL TEMPERATURE RANGES

6.8

8

TEST CIRCUITS AND WAVEFORMS

TEST CIRCUITS FOR ALL OUTPUTS

SWITCH POSITION

SET-UP, HOLD AND RELEASE TIMES

PULSE WIDTH

Test

Switch

Disable Low

Enable Low

Closed

All Other Tests

Open

Open Drain

DEFINITIONS:

CL=

Load capacitance: includes jig and probe capacitance.

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

Generator.

2565 drw 10

2565 drw 14

2565 drw 11

2565 drw 12

2565 drw 13

Pulse

Generator

R T

D.U.T.

V CC

VIN

C L

VOUT

50pF

500

Ω

500

Ω

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.

PROPAGATION DELAY

ENABLE AND DISABLE TIMES

2565 drw 14

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

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