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PDF ELM627 Data sheet ( Hoja de datos )
| Número de pieza | ELM627 | |
| Descripción | RS232 Break Detector | |
| Fabricantes | ELM Electronics | |
| Logotipo |  |
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ELM627
RS232 Break Detector
Description
The ELM627 is a complete circuit for detecting
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.
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.
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.
No external components are required for circuit
operation other than possibly a current limiting
resistor, as all timing references are generated
internally.
Applications
• Remote resetting of RS232 devices
• Edge triggered one-shot circuits
www.DataSh•eDeti4gUit.acollmy controlled sequencing schemes
• Watchdog type signal monitors
Features
• Low power CMOS design - typically 1mA at 5V
• No external timing elements required
• Complementary outputs
• Digitally controlled threshold timing
• Selectable output duration
• High current drive outputs - up to 25 mA
Connection Diagram
PDIP and SOIC
(top view)
VDD 1
Q2
Q3
P/C 4
8 VSS
7 T0
6 T1
5 TxD
Block Diagram
TxD 5
Programmable
Timer
67
T1 T0
Power on
Detect
Output
Logic
4
P/C
ELM627DSA
Elm Electronics – Circuits for the Hobbyist
< http://www.elmelectronics.com/ >
2Q
3Q
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1 page | ||
| Páginas | Total 4 Páginas | |
| PDF Descargar | [ Datasheet ELM627.PDF ] | |
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