Input circuit and method for holding data in mixed power supply

Details Input circuit and method for holding data in mixed power supply Input circuit and method for holding data in mixed power supply

1996-02-05

1997-08-12

Westin, Edward P.

Electronic digital logic circuitry

Interface

Supply voltage level shifting

326 17, 326 86, 327198, 327210, H03K 190948, H03K 19017

Patent

active

056569513

ABSTRACT:
An input circuit (10) includes two inverters (12, 16) and an enable transistor (18). When a logic high enable signal is transmitted to a gate electrode of the enable transistor (18). The two inverters (12, 16) form a latch that holds the data at the input port (21) of the input circuit (10). When a logic low enable signal is transmitted to the gate electrode of the enable transistor (18), the latch formed by the two inverters (12, 16) is disabled, thereby allowing fast data transmission through the input circuit (10). When the voltage at the input port (21) is higher than a supply voltage of the input circuit (10), the enable transistor (18) switches off to protect a voltage supply coupled to the input circuit (10).

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