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LT1237

更新时间： 2024-11-23 14:57:19
品牌 Logo 应用领域
亚德诺 - ADI /
页数 文件大小 规格书
8页 184K
描述
具先进电源管理功能并有一个接收器在器件停机模式中处于运行状态的 5V RS232 收发器

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中文翻译

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LT1237 数据手册

 浏览型号LT1237的Datasheet PDF文件第2页浏览型号LT1237的Datasheet PDF文件第3页浏览型号LT1237的Datasheet PDF文件第4页浏览型号LT1237的Datasheet PDF文件第5页浏览型号LT1237的Datasheet PDF文件第6页浏览型号LT1237的Datasheet PDF文件第7页 
LT1237  
5V RS232 Transceiver with  
Advanced Power Management and  
One Receiver Active in Shutdown  
U
FEATURES  
DESCRIPTIO  
■
One Receiver Remains Active While in Shutdown  
ESD Protection over ±15kV  
Uses Small Capacitors: 0.1µF, 0.2µF, 1.0µF  
60µA Supply Current in Shutdown  
Pin Compatible with LT1137A  
120kBaud Operation for RL = 3k, CL = 2500pF  
250kBaud Operation for RL = 3k, CL = 1000pF  
Operates to 120kBaud  
CMOS Comparable Low Power 30mW  
Operates from a Single 5V Supply  
Easy PC Layout—Flowthrough Architecture  
Rugged Bipolar Design  
The LT®1237 is an advanced low power three driver, five  
receiver RS232 transceiver. Included on the chip is a  
shutdown pin for reducing supply current near zero.  
During shutdown one receiver remains active to detect  
incoming RS232 signals, for example, to wake up a  
system.  
■
■
■
■
■
■
■
■
■
■
■
■
The LT1237 is fully compliant with all EIA RS232 specifi-  
cations. New ESD structures on the chip allow the LT1237  
to survive multiple ±15kV strikes, eliminating the need for  
costly TransZorbs® on the RS232 line pins.  
The LT1237 operates in excess of 120kbaud even driving  
heavy capacitive loads. Two shutdown modes allow the  
driver outputs to be shut down separately from the receiv-  
ers for more versatile control of the RS232 interface.  
During shutdown, drivers and receivers assume a high  
impedance state.  
Outputs Assume a High Impedance State When Off  
or Powered Down  
Absolutely No Latchup  
Available in SO and SSOP Packages  
■
■
U
, LTC and LT are registered trademarks of Linear Technology Corporation.  
TransZorb is a registered trademark of General Instruments, GSI  
APPLICATIO S  
■
Notebook Computers  
Palmtop Computers  
■
U
TYPICAL APPLICATIO  
Output Waveforms  
–
+
V
1
2
28  
27  
26  
25  
24  
23  
22  
21  
20  
19  
18  
17  
16  
15  
V
LT1237  
1.0µF  
0.1µF  
RECEIVER  
OUTPUT  
CL = 50pF  
5V V  
CC  
2 × 0.1µF  
3
2 × 0.1µF  
4
DRIVER 1 IN  
RX1 OUT  
5
DRIVER  
OUTPUT  
RL = 3k  
DRIVER 1 OUT  
RX1 IN  
6
DRIVER 2 IN  
RX2 OUT  
7
CL = 2500pF  
DRIVER 2 OUT  
RX2 IN  
TO LOGIC  
R
8
RX3 OUT  
TO  
LINE  
9
RX3 IN  
RX4 OUT  
INPUT  
10  
11  
12  
13  
14  
RX4 IN  
DRIVER 3 IN  
RX5 OUT (LOW-Q)  
DRIVER 3 OUT  
RING DETECT IN  
GND  
DRIVER  
DISABLE  
RX5 IN (LOW-Q)  
ON/OFF  
1237 TA02  
µCONTROLLER OR  
µPROCESSOR  
SHUTDOWN  
CONTROL OUT  
LT1237 TA01  
1
12345678

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