MXL1543

19-1929; Rev 1; 9/01 www.DataSheet4U.com +5V Multiprotocol, 3Tx/3Rx, SoftwareSelectable Clock/Data Transceivers General Description Features o MXL1543, MXL1544/MAX3175, and MXL1344A Chipset Is Pin Compatible with LTC1543, LTC1544, and LTC1344A o Supports RS-232, RS-449, EIA-530, EIA-530A, V.35, V.36, and X.21 o Software-Selectable Cable Termination Using the MXL1344A o Complete DTE or DCE Port with MXL1544/ MAX3175, and MXL1344A o +5V Single-Supply Operation o 0.5µA No-Cable Mode o TUV-Certified NET1/NET2 and TBR1/TBR2Compliant MXL1543 The MXL1543 is a three-driver/three-receiver multiprotocol transceiver that operates from a +5V single supply. The MXL1543, along with the MXL1544/MAX3175 and the MXL1344A, form a complete software-selectable data terminal equipment (DTE) or data communication equipment (DCE) interface port that supports the V.28 (RS-232), V.10/V.11 (RS-449/V.36, EIA-530, EIA530A, X.21), and V.35 protocols. The MXL1543 transceivers carry the high-speed clock and data signals while the MXL1544/MAX3175 carry the control signals. The MXL1543 can be terminated by the MXL1344A software-selectable resistor termination network or by discrete termination networks. An internal charge pump and a proprietary low-dropout transmitter output stage allow V.11- , V.28- , and V.35compliant operation from a +5V single supply. A nocable mode is entered when all mode pins (M0, M1, and M2) are pulled high or left unconnected. In nocable mode, supply current decreases to 0.5µA a...