74ACT16254

16-BIT ADDRESS/DATA MULTIPLEXER

WITH 3-STATE OUTPUTS

SCAS527A – AUGUST 1995 – NOVEMBER 1995

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POST OFFICE BOX 655303

Widebus

™ Family

Per JEDEC Standard JESD-17

External Pullup Resistors

Minimizes High-Speed Switching Noise

Small-Outline (DGG) Package

description

The 74ACT16254 is a dual 16-bit, noninverting

bus-interface device. The A and C ports perform

a transceiver function, like that of the 74ACT245.

The B and C ports perform the buffer/driver

function of the 74ACT244. The A and C port

outputs are designed to sink up to 12 mA.

The 74ACT16254 is designed for asynchronous

communication between data buses. The control

function implementation minimizes external

timing requirements.

Data transmission from the A port to the C port,

C port to A port, or B port to C port is accomplished

by setting the appropriate logic levels on the bus

enable (EN1 and EN2) inputs.

All outputs are disabled when logic highs are

placed on both EN1 and EN2; the buses are

effectively isolated.

The 74ACT16254 is packaged in TI’s thin shrink

small-outline package (DGG), which provides

twice the I/O pin count and functionality of

standard small-outline packages in the same

printed-circuit-board area.

Active bus-hold circuitry is provided to hold unused or floating data and I/O pins at a valid logic level.

The 74ACT16254 is characterized for operation from – 40

°C to 85°C.

Copyright

© 1995, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Widebus is a trademark of Texas Instruments Incorporated.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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B1

B3

B6

B7

B9

GND

B11

B13

B15

A16

A15

A14

GND

A13

A12

A11

A10

GND

A9

A8

A7

A6

A5

A4

GND

A3

A2

A1

EN2

EN1

B2

B4

B6

B8

B10

GND

B12

B14

B16

C16

C15

C14

GND

C13

C12

C11

C10

GND

C9

C8

C7

C6

C5

C4

GND

C3

C2

C1

NC

NC

DGG PACKAGE

(TOP VIEW)

NC – No internal connection