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SN75LBC775DW PDF预览

SN75LBC775DW

更新时间: 2024-11-23 22:53:31
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德州仪器 - TI /
页数 文件大小 规格书
11页 156K
描述
SINGLE-CHIP APPLETALKE AND LOCALTALKE TRANSCEIVER

SN75LBC775DW 数据手册

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SN75LBC775  
SINGLE-CHIP APPLETALK AND LOCALTALK TRANSCEIVER  
SLLS216A – MAY 1995 – REVISED JANUARY 1996  
DW PACKAGE  
(TOP VIEW)  
Single-Chip Interface Solution for  
AppleTalk and LocalTalk  
Designed to Operate Up To 1 Mbps In  
AppleTalk and LocalTalk  
1
2
3
4
5
6
7
8
9
10  
20  
19  
18  
17  
16  
15  
14  
13  
12  
11  
HSKA  
GND  
V
V
SS  
CC  
C–  
C+  
DEN  
DY  
DZ  
HSKY  
RY2  
RA2  
RB2  
RB1  
RA1  
RY1  
REN  
Switched-Capacitor Voltage Converter  
Allows for Single 5-V Operation  
4-kV ESD Protection on Bus Terminals  
Combines Multiple Components into a  
Single Chip Solution  
GND  
V
LinBiCMOS Process Technology  
CC  
DA  
description  
The SN75LBC775 is a low-power LinBiCMOS  
device that incorporates the drivers and receivers  
for an AppleTalk or a LocalTalk interface and a  
switched-capacitor voltage converter for a single  
5-V supply operation. LocalTalk uses a hybrid of  
RS-422 with the transceiver connected to the  
network through a small isolation transformer.  
The AppleTalk mode provides point-to-point  
communications and uses the same differential  
driver and receiver as LocalTalk with the addition  
of a hybrid RS-423, single-ended handshake  
driver (HSK) and receiver. In the AppleTalk mode,  
the port connects directly to the receiver with no  
isolation transformer.  
functional diagram  
1
18  
HSKY  
HSKA  
6
7
DY  
DZ  
10  
DA  
5
DEN  
13  
14  
RA1  
RB1  
12  
RY1  
While the device power is turned off (V  
= 0) or  
CC  
disabled in the LocalTalk mode, the outputs are in  
a high-impedance state. When the driver enable  
(DEN) terminal is high, both the differential and  
serial driver outputs are in a high-impedance  
state.  
16  
15  
RA2  
RB2  
17  
RY2  
11  
The receiver output can be disabled and becomes  
a high impedance when the REN terminal is low.  
REN  
19  
V
CC  
V
SS  
–5 V  
2
Aswitched-capacitorvoltageconvertergenerates  
the negative voltage required from a single 5-V  
supply using two 22-µF capacitors. One capacitor  
is between the C+ and Cterminals and the  
Charge Pump  
8
GND  
second is between V and ground.  
SS  
The SN75LBC775 is characterized for operating  
over the temperature range of 0°C to 70°C.  
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.  
LocalTalk and AppleTalk are trademarks of Apple Computer, Inc.  
LinBiCMOS is a trademark of Texas Instruments Incorporated.  
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.  
1
POST OFFICE BOX 655303 DALLAS, TEXAS 75265  
POST OFFICE BOX 1443 HOUSTON, TEXAS 77251–1443  

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