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LT1342

更新时间： 2023-12-20 18:46:25
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
8页 222K
描述
具 3V 逻辑接口的 5V RS232 收发器

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中文翻译

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LT1342 数据手册

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LT1342  
5V RS232 Transceiver with  
3V Logic Interface  
U
DESCRIPTIO  
EATURE  
S
F
The LT®1342 is an advanced low power three-driver, five-  
receiver RS232 transceiver. The LT1342 operates from a  
5V supply and a 3V logic supply. Receiver outputs can  
interface directly to 3V logic circuits. Included on the chip  
isashutdownpinforreducingsupplycurrenttonearzero.  
All receivers and drivers assume high impedance states  
during shutdown.  
■
■
■
■
■
■
■
■
■
■
■
■
■
ESD Protection Over ±10kV  
3V Logic Interface  
Uses Small Capacitors: 0.1µF, 0.2µF  
1µA Supply Current in Shutdown  
Low Power Driver Disable Operating Mode  
Pin Compatible with LT1137A  
120kBaud Operation for RL = 3k, CL = 2500pF  
250kBaud Operation for RL = 3k, CL = 1000pF  
CMOS Comparable Low Power: 60mW  
Operates from a 5V Supply and 3V Logic Supply  
Easy PC Layout: Flowthrough Architecture  
Rugged Bipolar Design  
The driver disable function provides additional control of  
operating mode. When driver disable is high the charge  
pump and drivers turn off. Receivers continue to operate  
during driver disable.  
New ESD structures on the chip allow the LT1342 to  
survive multiple ±10kV strikes, eliminating the need for  
costly TransZorbs® on the RS232 line pins.  
Outputs Assume a High Impedance State When  
Off or Powered Down  
Absolutely No Latchup  
■
The LT1342 is fully compliant with all EIA RS232 specifi-  
cations and operates in excess of 120kbaud even driving  
heavy capacitive loads.  
O U  
PPLICATI  
S
A
■
Notebook Computers  
Palmtop Computers  
, LTC and LT are registered trademarks of Linear Technology Corporation.  
TransZorb is a registered trademark of General Instruments, GSI.  
■
U
O
TYPICAL APPLICATI  
Output Waveforms  
+
–
1
2
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
V
V
RECEIVER  
OUTPUT  
0.1µF  
0.1µF  
5V V  
CC  
2 × 0.1µF  
V
L = 3V  
3
LT1342  
CL = 50pF  
2 × 0.1µF  
4
DRIVER 1 IN  
RX1 OUT  
DRIVER 2 IN  
RX2 OUT  
RX3 OUT  
RX4 OUT  
DRIVER 3 IN  
RX5 OUT  
GND  
5
DRIVER 1 OUT  
RX1 IN  
DRIVER  
6
R
OUTPUT  
RL = 3k  
7
DRIVER 2 OUT  
RX2 IN  
C
L = 2500pF  
TO 3V LOGIC  
8
TO LINE  
9
RX3 IN  
10  
11  
12  
13  
14  
RX4 IN  
DRIVER 3 OUT  
RX5 IN  
INPUT  
ON/OFF  
DRIVER DISABLE  
LT1342 • TA02  
3V V  
NC  
L
LT1342 • TA01  
1
12345678

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