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RS232

更新时间： 2024-11-24 12:14:19
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凌特 - Linear /
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20页 337K
描述
Transceivers

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中文翻译

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RS232 数据手册

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LTC1321/LTC1322/LTC1335  
RS232/EIA562/RS485  
Transceivers  
U
DESCRIPTIO  
EATURE  
S
F
■
The LTC1321/LTC1322/LTC1335 are low power CMOS  
bidirectionaltransceivers,eachfeaturingtworeconfigurable  
interface ports. Each can be configured as two RS485  
differential ports, as two single-ended ports, or as one  
RS485 differential port and one single-ended port. The  
LTC1321/LTC1322canprovideRS232orEIA562compat-  
ible single-ended outputs; the LTC1335 provides EIA562  
compatible outputs and additionally includes an output  
enable pin, allowing the receiver logic level outputs to be  
three-stated.  
LTC1321: 2-EIA562/RS232 Transceivers/2-RS485  
Transceivers  
LTC1322: 4-EIA562/RS232 Transceivers/2-RS485  
Transceivers  
LTC1335: 4-EIA562 Transceivers/2-RS485  
Transceivers with OE  
■
■
■
LTC1321/LTC1322 Have the Same Pinout as  
SP301/SP302  
■
■
■
■
■
■
■
■
LTC1335 Features Receiver Three-State Outputs  
Low Supply Current: 1mA Typical  
15µA Supply Current in Shutdown  
120kBaud in EIA/TIA-562 or RS232 Mode  
10MBaud in RS485/RS422 Mode  
Self-Testing Capability in Loopback Mode  
Power-Up/Down Glitch-Free Outputs  
Driver Maintains High Impedance in Three-State,  
Shutdown or With Power Off  
The RS232/EIA562 transceivers operate to 120kbaud and  
are in full compliance with EIA/TIA-562 specification. The  
RS485 transceivers operate to 10Mbaud and are in full  
compliance with RS485 and RS422 specifications. All  
interface drivers feature short-circuit and thermal shut-  
down protection. An enable pin allows RS485 driver  
outputs to be forced into high impedance which is main-  
tained 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  
connects the driver outputs back to the receiver inputs for  
diagnostic self-test.  
■
■
■
Thermal Shutdown Protection  
I/O Lines Can Withstand ±25V  
Withstands Repeated 10kV ESD Pulses  
U
APPLICATIONS  
Low Power RS485/RS422/EIA562/RS232 Interface  
Cable Repeater  
■
■
■
The LTC1321/LTC1322 can support RS232 voltage levels  
when 6.5V ≤ VDD ≤ 10V and –6.5V ≥ VEE ≥ –10V. The  
LTC1335 supports receiver output enable but not RS232  
levels. A shutdown mode reduces the ICC supply current  
to 15µA.  
Level Translator  
U
O
TYPICAL APPLICATI  
24  
1
15  
V
24  
1
V
CC2  
CC1  
5V  
5V  
11  
10  
2
3
22  
RS485 INTERFACE  
RX OUT  
RX OUT  
21  
20  
16  
17  
120Ω  
DR ENABLE  
120Ω  
DR ENABLE  
DR IN  
9
4
DR IN  
8
7
5
4000-FT 24-GAUGE TWISTED PAIR  
EIA562 INTERFACE  
19  
18  
22  
23  
20  
21  
13  
19  
18  
17  
16  
15  
14  
13  
6
5V  
5V  
5V  
0V  
5V  
5V  
5V  
0V  
LTC1322  
6
LTC1322  
7
3
2
8
RX OUT  
RX OUT  
DR IN  
DR IN  
DR IN  
RX OUT  
RX OUT  
9
5
10  
11  
4
DR IN  
12  
12  
V
V
EE2  
EE1  
–5V  
–5V  
1321/22/35 TA01  
1
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