The ML145407 is a silicon–gate CMOS IC that combines three drivers and three receivers to fulfill the electrical specifications of RS232 EIA–232–E and CCITT V.28 while operating from a single + 5V power supply. A voltage doubler and inverter convert the + 5V to ± 10 V. This is accomplished through an on–board 20 kHz oscillator and four inexpensive external electrolytic capacitors. The three drivers and three receivers of the ML145407 are virtually identical to those of the ML145406. Therefore, for applications requiring more than three drivers and/or three receivers, an ML145406 can be powered from an ML145407, since the ML145407 charge pumps have been designed to guarantee ± 5 V at the output of up to six drivers. Thus, the ML145407 provides a high–performance, low–power, stand–alone solution or, with the ML145406, a + 5 V only, high–performance two–chip solution. This device offers

the following performance features:

• Operating Temperature Range = TA –40° to +85°C

Drivers

• ± 7.5 V Output Swing

• 300Ω Power–Off Impedance

• Output Current Limiting

• TTL and CMOS Compatible Inputs

• Slew Rate Range Limited from 4 V/µs to 30 V/µs

Receivers

• + 25 V Input Range

• 3 to 7 kΩ Input Impedance

• 0.8 V Hysteresis for Enhanced Noise Immunity