IDT74FCT157ATDB datasheet, PDF

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IDT74FCT157ATDB: DescriptionFAST CMOS QUAD 2-INPUT MULTIPLEXER; File Size93KB，7 Pages; ManufacturerIDT (Integrated Device Technology, Inc.); Websitehttp://www.idt.com/

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IDT74FCT157ATDB Overview

FAST CMOS QUAD 2-INPUT MULTIPLEXER

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FAST CMOS

QUAD 2-INPUT

MULTIPLEXER

Integrated Device Technology, Inc.

IDT54/74FCT157T/AT/CT/DT

IDT54/74FCT257T/AT/CT/DT

IDT54/74FCT2257T/AT/CT

FEATURES:

• Common features:

– Low input and output leakage

≤1µA

(max.)

– CMOS power levels

– True TTL input and output compatibility

– V

= 3.3V (typ.)

– V

= 0.3V (typ.)

– Meets or exceeds JEDEC standard 18 specifications

– Product available in Radiation Tolerant and Radiation

Enhanced versions

– Military product compliant to MIL-STD-883, Class B

and DESC listed (dual marked)

– Available in DIP, SOIC, SSOP, QSOP, CERPACK

and LCC packages

• Features for FCT157T/257T:

– Std., A, C and D speed grades

– High drive outputs (-15mA I

, 48mA I

)

• Features for FCT2257T:

– Std., A, and C speed grades

– Resistor outputs (-15mA I

, 12mA I

Com.)

(-12mA I

, 12mA I

Mil.)

– Reduced system switching noise

DESCRIPTION:

The FCT157T, FCT257T/FCT2257T are high-speed quad

2-input multiplexers built using an advanced dual metal CMOS

technology. Four bits of data from two sources can be

selected using the common select input. The four buffered

outputs present the selected data in the true (non-inverting)

form.

The FCT157T has a common, active-LOW, enable input.

When the enable input is not active, all four outputs are held

LOW. A common application of ‘FCT157T is to move data

from two different groups of registers to a common bus.

Another application is as a function generator. The ‘FCT157T

can generate any four of the 16 different functions of two

variables with one variable common.

The FCT257T/FCT2257T have a common Output Enable

(

) input. When

is HIGH, all outputs are switched to a

high-impedance state allowing the outputs to interface directly

with bus-oriented systems.

The FCT2257T has balanced output drive with current

limiting resistors. This offers low ground bounce, minimal

undershoot and controlled output fall times-reducing the need

for external series terminating resistors. FCT2xxxT parts are

plug-in replacements for FCTxxxT parts.

FUNCTIONAL BLOCK DIAGRAM

PIN CONFIGURATIONS

GND

157 Only

3 other multiplexers

P16-1,

D16-1,

SO16-1,

SO16-7

E16-1

–I

–Z

Vcc

E or OE*

2537 drw 02

DIP/SOIC/QSOP/CERPACK

TOP VIEW

Vcc

E or OE*

257 Only

INDEX

2537 drw 01

L20-2

20 19

9 10 11 12 13

LCC

TOP VIEW

The IDT logo is a registered trademark of Integrated Device Technology, Inc.

GND

2537 drw 03

for FCT157,

for FCT257/FCT2257.

MILITARY AND COMMERCIAL TEMPERATURE RANGES

Integrated Device Technology, Inc.

JUNE 1996

2537/6

6.6

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