The MXL1543B is a three-driver/three-receiver multiprotocol
transceiver that operates from a +5V single supply.
The MXL1543B, 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, EIA-530A, X.21), and V.35 protocols. The MXL1543B transceivers
carry the high-speed clock and data signals,
while the MXL1544/MAX3175 carry the control signals.
The MXL1543B 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.35-
compliant 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 no-cable
mode, supply current decreases to 0.5µA and all
transmitter and receiver outputs are disabled (high
impedance). Short-circuit current limiting and thermal
shutdown circuitry protect the drivers against excessive
power dissipation.
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