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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, 300 Ω 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 7 kΩ 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