High speed level converter to convert a TTL logic signal to a CM

Details High speed level converter to convert a TTL logic signal to a CM High speed level converter to convert a TTL logic signal to a CM

1990-02-22

1991-09-24

Hudspeth, David

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307448, 307443, 307264, H03K 512

Patent

active

050516248

ABSTRACT:
A level converter for converting a TTL level of an input signal to a CMOS level comprises a NOR gate circuit (1), including a first voltage pull-up PMOS transistor (PI2), to which the TTL signal is inputted, an inverter (INV) connected to the NOR gate circuit, and a speed control circuit (2). The speed control circuit includes a second voltage pull-up PMOS transistor (PI4), and means are provided for connecting the first and second transistors in parallel between VCC and the input to the inverter. A fast conversion speed is obtained by turning on both PMOS transistors (PI2, PI4) when the TTL signal goes from the high level to the low level.

REFERENCES:
patent: 4450371 (1984-05-01), Bismark
patent: 4728820 (1988-03-01), Lee
patent: 4763022 (1988-08-01), Sheldon
patent: 4794282 (1988-12-01), Colles

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