ELM627
RS232 Break Detector
Quantity Pricing
The following are the unit prices, as you vary the quantity purchased:
| 1-9 |
| $8.00 |
| 10-99 |
| $6.67 |
| 100-999 |
| $6.15 |
| 1000+ |
| $5.71 |
All prices are in Canadian dollars. We use the total number purchased (ELM627P + ELM627SM) for the calculation.
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
- Digitally 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 or SOIC, top view )
Block Diagram
Downloads
The ELM627 data sheet (ver A, 26K):
