RS_232_transceiver_with_automatic_power_shutdown

Published:2009/7/23 22:44:00 Author:Jessie | From:SeekIC

This circuit automatically shuts down when there is no data flow through the interface. A data stream on either the RS-232 or logic inputs activates the transceiver. The data must begin with a logic-1 preamble, and the data stream must contain a sufficient number of 1s to keep the transceiver active. The preamble can be as short as 50 μs. Alternatively, input to the circuit could be an RS-232 handshake signal, such as Data Set Ready (DSR) or Clear to Send (CTS), which remain high during the data transfer. The LT1180 200-μs turn-on delay does not limit the data rate in the circuit. Once the LT1180 is active, data can be processed at the maximum 100kbaud data rate.



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