SN75LBC776

SINGLE-CHIP GeoPort

 TRANSCEIVER

SLLS221B – NOVEMBER 1995 – REVISED MARCH 2002

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9-terminal GeoPort

 Host (DTE)

Duplex

LocalTalk



Single-chip Solution

GeoPort Peripheral (DCE) Interface Device

description

The SN75LBC776 is a low-power LinBiCMOS device that incorporates the drivers and receivers for a 9-pin

GeoPort host interface. GeoPort combines hybrid EIA/TIA-422-B and EIA/TIA-423-B drivers and receivers to

transmit data up to four megabits per second (Mbit/s) full duplex. GeoPort is a serial communications standard

that is intended to replace the RS-232, Appletalk, and LocalTalk printer ports all in one connector in addition

to

providing

real-time

data

transfer

capability.

It

provides

point-to-point

connections

between

GeoPort-compatible devices with data transmission rates up to 4 Mbit/s full duplex and a hot-plug feature.

Applications include connection to telephony, integrated services digital network (ISDN), digital sound and

imaging, fax-data modems, and other serial and parallel connections. The GeoPort is backwardly compatible

to both LocalTalk and AppleTalk.

(SHDN) terminal is high, the charge pump is powered down and the outputs are in a high-impedance state. The

driver enable (DEN) terminal sends the outputs of the differential driver into a high-impedance state with a high

input signal. All drivers and receivers have fail-safe mechanisms to ensure a high output state when the inputs

are left open.

A switched-capacitor voltage converter generates the negative voltage required from a single 5-V supply using

four 0.1-

ground.

The SN75LBC776 is characterized for operation over the 0

°C to 70°C temperature range.

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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DA1

C–

C+

SHDN

DZ2

DY2

GND

DEN

DA2

GND

DY1

RY3

RB3

RA2

RY2

RB1

RA1

RY1

DB or DW PACKAGE

(TOP VIEW)

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.

Copyright

 2002, Texas Instruments Incorporated

GeoPort, LocalTalk, and AppleTalk are trademarks of Apple Computer, Incorporated.

LinBiCMOS is a trademark of Texas Instruments Incorporated.