High voltage level converter

Details High voltage level converter High voltage level converter

1993-06-15

1994-04-05

Mullins, James B.

Wheel substitutes for land vehicles

Tracks or treads

With detachable grouser for endless chain track

36518911, 365222, G11C 700

Patent

active

053011511

ABSTRACT:
Circuitry for locking out a first signal generated from a first power supply while the first power supply is at or below a first voltage level is described for a non-volatile semiconductor memory. The circuitry includes a first P-type transistor P1 having a gate, a drain, and a source. The source of P1 is coupled to a second power supply, the drain of P1 is coupled to a first node and the gate of P1 is coupled to a second node. The second node provides an output signal representative of the first control signal. The circuitry also includes a first N-type transistor N1, having a gate, a drain, and a source. The drain of N1 is coupled to the first node, the source of N1 is coupled to a third, and the gate of N1 is coupled to the first control signal and to a fourth node. Included is a second N-type transistor N2, having a drain, a source and a gate. The gate of N2 is coupled a sixth node. The drain of N2 is coupled to the second node and the source of N2 is coupled to the third node. A second P-type transistor is included in the circuitry and also has a gate, a drain and a source. The source of P2 is coupled to the second power supply, the gate of P2 is coupled to the first node and a drain of P2 is coupled to second node. Also included in this circuitry is a third N-type transistor N3 having a gate, a drain, and a source. The drain of the N3 transistor is coupled to the first node, the source of N3 is coupled to the third node and the gate of N3 is coupled to a fifth node. The circuitry includes apparatus for preventing transistor N2 from driving the second node when the first power supply is below the first voltage level. The output of the apparatus is coupled to the gate of N2. The apparatus inputs are coupled to the first control signal and a second control signal representative of the voltage level of said first power supply.

REFERENCES:
patent: 4787066 (1988-11-01), Leuschner
patent: 4975883 (1990-12-01), Baker et al.

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