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ELM627 PDF预览

ELM627

更新时间: 2024-10-30 04:17:19
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ELM /
页数 文件大小 规格书
4页 30K
描述
RS232 Break Detector

ELM627 数据手册

 浏览型号ELM627的Datasheet PDF文件第2页浏览型号ELM627的Datasheet PDF文件第3页浏览型号ELM627的Datasheet PDF文件第4页 
ELM627  
RS232 Break Detector  
Description  
Features  
The ELM627 is a complete circuit for detecting  
• Low power CMOS design - typically 1mA at 5V  
• No external timing elements required  
• Complementary outputs  
break signals on RS232 lines, in an 8 pin package.  
This is useful for remotely resetting circuits through a  
serial link. For convenience, this circuit also  
generates an output pulse on power-up.  
• Digitally controlled threshold timing  
• Selectable output duration  
The timing threshold for break signal detection is  
user selectable, allowing the circuit to respond to  
transmitted null characters, <ctrl>@, at various baud  
rates. This provides a convenient means for the  
remote triggering of this circuit by simply shifting to a  
lower baud rate and sending a null byte.  
• High current drive outputs - up to 25 mA  
Two complementary high current outputs are  
provided by the ELM627, so that further buffering is  
not usually required. The output signal can be  
selected to be either a continuous one (following the  
TxD input line) or else a 100ms pulse output.  
Connection Diagram  
PDIP and SOIC  
(top view)  
No external components are required for circuit  
operation other than possibly a current limiting  
resistor, as all timing references are generated  
internally.  
1
2
3
4
8
7
6
5
VDD  
Q
VSS  
T0  
Q
T1  
Applications  
P/C  
TxD  
• Remote resetting of RS232 devices  
• Edge triggered one-shot circuits  
• Digitally controlled sequencing schemes  
• Watchdog type signal monitors  
Block Diagram  
Power on  
Detect  
TxD  
5
Output  
Logic  
Programmable  
Timer  
2
Q
4
7
3
6
Q
T1  
T0  
P/C  
ELM627DSA  
Elm Electronics – Circuits for the Hobbyist  
1 of 4  
< http://www.elmelectronics.com/ >  

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