DESCRIPTION

The MC145406 is a silicon-gate CMOS IC that combines 3 drivers and 3 receivers to fulfill the electrical specifications of standards EIA-232-D and CCITT V.28. The drivers feature true TTL input compatibility, slew-rate limited output, 300Ω power-off source impedance, and output typically switching to within 25 of the supply rails. The receivers can handle up to +25V while presenting 3 to 7kΩ impedance. Hysteresis in the receiver aids reception of noisy signals. By combining both drivers and receivers in a single CMOS chip, the MC145406 provides efficient, low-power solutions for EIA-232-D and V.28 applications.

FEATURES

• Drivers

• +5 to +12V supply range

• 300Ω power-off source impedance

• Output current limiting

• TTL compatible

• Maximum slew rate = 30V/µs

• Receivers

• +25V input voltage range over the full supply range

• 3 to 7kΩ input impedance

• Hysteresis on input switchpoint

• General

• Very low supply currents for long battery life

• Operation is independent of power supply sequencing

APPLICATIONS

• Modem interface

• Voice/data telephone interface

• Lap-top computers

• UART interface