ELM626 Datasheet PDF - ELM Electronics

ELM626 RS232 Break Detector Description The ELM626 is a complete circuit for detecting break signals on RS232 lines, in...

ELM626 RS232 Break Detector Description The ELM626 is a complete circuit for detecting break signals on RS232 lines, in an 8 pin package. The circuit is similar to the ELM627 except that an output pulse is not generated on power-up. The threshold for break signal detection is user selectable, allowing the circuit to respond to a transmitted null character, @, 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 ELM626, 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 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 6 7 T1 T0 Output Logic 4 P/C 2Q 3Q ELM626DSA...