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LTC1334

更新时间： 2024-09-18 14:58:23
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
16页 279K
描述
单 5V RS232/RS485 多协议收发器

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中文翻译

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LTC1334 数据手册

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LTC1334  
Single 5V RS232/RS485  
Multiprotocol Transceiver  
U
FEATURES  
DESCRIPTIO  
The LTC®1334 is a low power CMOS bidirectional trans-  
ceiver featuring two reconfigurable interface ports. It can  
be configured as two RS485 differential ports, as two dual  
RS232 single-ended ports or as one RS485 differential  
port and one dual RS232 single-ended port. An onboard  
charge pump requires four 0.1µF capacitors to generate  
boostedpositiveandnegativesupplies,allowingtheRS232  
drivers to meet the RS232 ±5V output swing requirement  
with only a single 5V supply. A shutdown mode reduces  
the ICC supply current to 10µA.  
■
Four RS232 Transceivers or Two RS485  
Transceivers on One Chip  
■
Operates from a Single 5V Supply  
■
Withstands Repeated ±10kV ESD Pulses  
■
Uses Small Charge Pump Capacitors: 0.1µF  
■
Low Supply Current: 8mA Typical  
■
10µA Supply Current in Shutdown  
■
Self-Testing Capability in Loopback Mode  
■
Power-Up/Down Glitch-Free Outputs  
■
Driver Maintains High Impedance in Three-State,  
Shutdown or with Power Off  
Thermal Shutdown Protection  
Receiver Inputs Can Withstand ±25V  
The RS232 transceivers are in full compliance with RS232  
specifications. The RS485 transceivers are in full compli-  
ance with RS485 and RS422 specifications. All interface  
drivers feature short-circuit and thermal shutdown pro-  
tection. An enable pin allows RS485 driver outputs to be  
forced into high impedance, which is maintained even  
when the outputs are forced beyond supply rails or power  
is off. Both driver outputs and receiver inputs feature  
±10kV ESD protection. A loopback mode allows the driver  
outputs to be connected back to the receiver inputs for  
diagnostic self-test.  
■
■
U
APPLICATIO S  
■
Low Power RS485/RS422/RS232/EIA562 Interface  
■
Software-Selectable Multiprotocol Interface Port  
■
Cable Repeaters  
Level Translators  
■
, LTC and LT are registered trademarks of Linear Technology Corporation.  
U
TYPICAL APPLICATIO  
27  
28  
1
2
2
1
28  
27  
3
3
LTC1334  
LTC1334  
26  
17  
26  
24  
V
V
CC1  
5V  
CC2  
13  
12  
4
5
5V  
RS485 INTERFACE  
RX OUT  
RX OUT  
23  
22  
18  
19  
120Ω  
DR ENABLE  
120Ω  
DR ENABLE  
DR IN  
11  
6
DR IN  
10  
9
7
4000-FT 24-GAUGE TWISTED PAIR  
RS232 INTERFACE  
21  
20  
24  
25  
22  
23  
15  
21  
20  
19  
18  
17  
16  
15  
8
5V  
5V  
5V  
0V  
5V  
5V  
5V  
0V  
8
9
4
5
11  
10  
13  
12  
RX OUT  
RX OUT  
DR IN  
DR IN  
DR IN  
RX OUT  
RX OUT  
6
7
DR IN  
14  
14  
ALL CAPACITORS: 0.1µF MONOLITHIC CERAMIC TYPE  
LTC1334 • TA01  
1
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