74ACT11652

OCTAL BUS TRANSCEIVER AND REGISTER

WITH 3-STATE OUTPUTS

SCAS087A – APRIL 1993 – REVISED APRIL 1996

1

POST OFFICE BOX 655303

and B Buses

PCB Layout

Minimize High-Speed Switching Noise

CMOS) 1-

mm Process

125

°C

description

This device 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.

Enable GAB and GBA are provided to control the

transceiver functions. SAB and SBA control pins

are provided to select whether real-time or stored

data is transferred. The circuitry used for select

control eliminates the typical decoding glitch that

occurs in a multiplexer during the transition

between stored and real-time data. A low input

level selects real-time data, and a high selects

stored

data.

Figure

1

illustrates

the

four

fundamental bus-management functions that can

be performed with the octal bus transceivers and

registers.

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

appropriate clock pins (CAB or CBA), 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 GAB and GBA. 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 of bus lines remains at its last

state.

The 74ACT11652 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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GAB

A1

A2

A3

A4

GND

GND

GND

GND

A5

A6

A7

A8

GBA

CAB

SAB

B1

B2

B3

B4

B5

B6

B7

B8

CBA

SBA

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