SN75LBC771_07 Datasheet, PDF (1/14 Pages) Texas Instruments – GEOPORT TRANSCEIVER

SN75LBC771
GEOPORT™ TRANSCEIVER
SLLS226A – APRIL 1996 – REVISED NOVEMBER 1997
D Supports a 9-Pin GeoPort™ Host Interface
Standard for the Intelligent Network Port
D Designed to Operate up to 4-Mbit/s Full
Duplex
D ± 5 V Supply Operation
D Provides 6 kV ESD Protection
D Has Driver Short-Circuit Protection
D Includes Failsafe Mechanism for Open
Inputs
D Is Backward Compatible with AppleTalk™
and LocalTalk™
D Combines Multiple Components into a
Single Chip Solution
D Complements the SN75LBC772 9-Pin
GeoPort Peripheral (DCE) Interface Device
D Uses LinBiCMOS™ Process Technology
description
The SN75LBC771 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-Mbit/s full duplex. GeoPort is a serial
communications standard that is intended to
replace the RS-232, AppleTalk, and printer ports
all in one connector in addition to providing
real-time data transfer capability. The
SN75LBC771 provides point-to-point connec-
tions between GeoPort-compatible devices with
data transmission rates up to 4-Mbit/s full duplex
featuring a hot-plug capability. Applications
include connection to telephone, ISDN, digital
sound and imaging, fax-data modems, and other
traditional serial and parallel connections. The
GeoPort is backwardly compatible to both
LocalTalk and AppleTalk.
DW PACKAGE
(TOP VIEW)
DA1 1
V_EE 2
NC 3
NC 4
SHDN 5
DZ2 6
DY2 7
GND 8
DEN 9
DA2 ¹⁰
20 GND
19 V_CC
18 DY1
17 RY3
16 RB3
15 RA2
14 RY2
13 RB1
12 RA1
11 _RY1
logic diagram (positive logic)
DA2 ¹⁰
DEN
9
7
DY2
6
DZ2
RY1 ¹¹
12
RA1
13
RB1
DA1
1
RY2 ¹⁴
18
DY1
15
RA2
RY3 ¹⁷
5
SHDN
16
RB3
While the SN75LBC771 is powered off (V_CC and V_EE = 0 ), the outputs are in a high-impedance state. Also, when
the shutdown (SHDN) terminal is high, all outputs go into a high-impedance state. A logic high on the driver
enable (DEN) terminal places the outputs of the differential driver into a high-impedance state. All drivers and
receivers have fail-safe mechanisms that ensure a high output state when the inputs are left open.
The SN75LBC771 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.
GeoPort, LocalTalk, and AppleTalk are trademarks of Apple Computer, Incorporated.
LinBICMOS is a trademark of 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.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright © 1997, Texas Instruments Incorporated
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