3.3 Volt Only Driver/Receiver with an Integrated Standby Mode EIA–232–E and CCITT V.28

The MC145583 is a CMOS transceiver composed of three drivers and five receivers that fulfills the electrical specifications of EIA–232–E, EIA–562, and CCITT V.28 while operating from a single + 3.3 or + 5.0 V power supply. This transceiver is a high–performance, low–power consumption device that is equipped with a standby function.

A voltage tripler and inverter converts the + 3.3 V to ± 8.8 V, or a voltage doubler and inverter converts the + 5.0 V to ± 8.8 V. This is accomplished through an on–chip 40 kHz oscillator and five inexpensive external capacitors.

Drivers:

? ± 5 V Minimum Output Swing at 3.3 or 5.0 V Power Supply

? 300 ? Power–Off Impedance

? Output Current Limiting

? Three–State Outputs During Standby Mode

Receivers:

? ± 25 V Input Range

? 3 to 7 k? Input Impedance

? 0.8 V Hysteresis for Enhanced Noise Immunity

? Three–State Outputs During Standby Mode

Ring Monitor Circuit:

? Invert the Input Level on Rx1 to Logic Output Level on RIMON at Standby Mode