MC145406B

Drivers

+5 to +12V supply range

300ohms power-off source impedance

Output current limiting

TTL compatible

Maximum slew rate = 30V/us

Receivers

+25V input voltage range over the full supply range

3 to 7ku2126 input impedance

Hysteresis on input switchpoint

General

Very low supply currents for long battery life

Operation is independent of power supply sequencing

The MC145406 is a silicon-gate CMOS IC that combines 3 driversand 3 receivers to fulfill the electrical specifications of standardsEIA-232-D and CCITT V.28. The drivers feature true TTL inputcompatibility, slew-rate limited output, 300u2126 power-off sourceimpedance, and output typically switching to within 25% of thesupply rails. The receivers can handle up to +25V while presenting3 to 7ku2126 impedance. Hysteresis in the receiver aids reception ofnoisy signals. By combining both drivers and receivers in a singleCMOS chip, the MC145406 provides efficient, low-power solutionsfor EIA-232-D and V.28 applications.

Modem interface

Voice/data telephone interface

Lap-top computers

UART interface