IDT74FCT138ATSO datasheet(5/6 Pages) IDT

Part #	IDT74FCT138ATSO

Description	FAST CMOS 1-OF-8 DECODER WITH ENABLE

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Manufacturer	IDT [Integrated Device Technology]

Direct Link	http://www.idt.com

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IDT54/74FCT138T/AT/CT

FAST CMOS 1-OF-8 DECODER-WITH ENABLE

MILITARY AND COMMERCIAL TEMPERATURE RANGES

6.3

5

TEST CIRCUITS AND WAVEFORMS

TEST CIRCUITS FOR ALL OUTPUTS

ENABLE AND DISABLE TIMES

PROPAGATION DELAY

SWITCH POSITION

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.

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.

2570 tbl 08

2570 drw 04

2570 drw 06

2570 drw 05

2570 drw 08

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

2570 drw 07

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