74AC11652

OCTAL BUS TRANSCEIVER AND REGISTERS

WITH 3-STATE OUTPUTS

SCAS088A - DECEMBER 1989 - REVISED APRIL 1996

1

POST OFFICE BOX 655303

and B Buses

Layout

Minimize High-Speed Switching Noise

CMOS) 1-

μm Process

125

°C

description

The 74AC11652 consists of bus transceiver

circuits, D-type flip-flops, and control circuitry

arranged for multiplexed transmission of data

directly from the data bus or from the internal

storage registers. Output-enable (OEAB and OEBA) inputs are provided to control the transceiver functions.

The select-control (SAB and SBA) inputs are provided to select whether real-time or stored data is transferred.

A low input level selects real-time data, and a high input level selects stored data. Figure 1 illustrates the four

fundamental bus-management functions that can be performed with the 74AC11652.

Data on the A or B bus, or both, can be stored in the internal D flip-flops by low-to-high transitions at the

appropriate clock (CLKAB or CLKBA) inputs, regardless of the select- or enable-control pins. When SAB and

SBA are in the real-time transfer mode, it is also possible to store data without using the internal D-type flip-flops

by simultaneously enabling OEAB and OEBA. In this configuration, each output reinforces its input. Thus, when

all other data sources to the two sets of bus lines are at high impedance, each set remains at its last state.

The 74AC11652 is characterized for operation from − 40

°C to 85°C.

Copyright

© 1996, 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.

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.

EPIC is a trademark of Texas Instruments Incorporated.

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OEAB

A1

A2

A3

A4

GND

GND

GND

GND

A5

A6

A7

A8

OEBA

CLKAB

SAB

B1

B2

B3

B4

B5

B6

B7

B8

CLKBA

SBA