Matching of TTL to MOS circuits - allows integration of both, adjusting current levels using current reflecting transistors

摘要

The matching or interfacing arrangement links TTL and MOS circuits the design allows the two types of circuit to be integrated and provides the required input and output level adjustment allowing the MOS circuit to be interfaced with further TTL. The interface is governed by an input differential amplifier having a constant current power source. This controls the logic state of a following switching circuit feeding the MOS section. The current levels in the two circuits are governed by current reflecting transistors the final one of which provides a reference current governed by a resistor in its collector to supply circuit.