Latch circuit

Details Latch circuit Latch circuit

1995-05-24

1996-10-22

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Particular stable state circuit

327208, 327210, 327215, H03K 3286, H03K 3356

Patent

active

055680771

ABSTRACT:
A latch circuit comprises, as a circuit corresponding to 1 bit, a flip-flop 50 which is composed of a plurality of NAND gates 11a, 11b, and holds a given signal value and outputs the positive logic value to a Q signal line 5a and the negative logic value to a /Q signal line 5b, and a differential amplifying circuit composed of a plurality of P-type FETs and N-type FETs and having a characteristics such that, an input voltage to the flip-flop 50, when the signal to be held is given, starts to fall before the time point when a drop in voltage of either an X signal line 4a or a /X signal line 4b becomes larger than the difference between a source voltage and a threshold voltage of the NAND gates 11a, 11b. The latch circuit is mainly used as internal elements of a data processor, whereby when the signal is inputted, an voltage of the input signal to the flip-flop 50 of the latch circuit approaches to the threshold voltage of the logic gates constituting the flip-flop 50.

REFERENCES:
patent: 4692634 (1987-09-01), Fang et al.
patent: 5036217 (1991-07-01), Rollins et al.
patent: 5189319 (1993-02-01), Fung et al.
patent: 5391935 (1995-02-01), Gersbach et al.

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