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US 4,131,808 AGranted
TTL to MOS driver circuit
AssigneeFairchild Camera and Instrument Corporation
InventorJames R. Kuo
Life of this patent
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Abstract
A high speed driver for providing high-current and high-voltage output levels suitable for driving MOS circuits, such as MOS RAMs from standard TTL input signals. Novel circuitry in the driver provides very high speed signal switching and a power-saving feature prevents MOS supply current drain by the circuit when TTL power has been turned off.
Claims9
A TTL to MOS driver circuit comprising:
- input circuitry including an input buffer transistor coupled between a TTL power source and ground reference for generating buffer output signals in response to applied binary input signals;
- a phase splitter transistor coupled between a MOS power source and ground and to the emitter of said input buffer transistor, said phase splitter transistor being switched between conductive and nonconductive states in response to said buffer transistor output signals;
- an output stage including first and second output transistors in series between said MOS power source and ground and coupled to said phase splitter transistor, said first output transistor being enabled when said phase splitter transistor is conductive, said second output transistor being enabled when said phase splitter transistor is nonconductive, the interconnection of said first and second output transistors providing the output terminal of said driver;
- and
- current control circuitry responsive to a predetermined drop in voltage of said TTL power source for switching off all MOS power in the conductor to said phase splitter transistor and to said output stage, and for instantaneously grounding stored charges in said conductor.
2 more elements
Dependencies are inferred from the claim text.