Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Particular stable state circuit
Patent
1995-02-17
1996-08-13
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Particular stable state circuit
327201, 327214, 327225, H03K 3037
Patent
active
055460356
ABSTRACT:
A latch circuit with an NAND function comprises a three-input NAND gate circuit, a first transfer gate connected between a first input terminal and a first input of the NAND gate circuit, a second transfer gate connected between a second input terminal and a second input of the NAND gate circuit, and a third transfer gate connected between a third input terminal and a third input of the NAND gate circuit. An input of a feedback inverter is connected To an output of the NAND gate circuit, and an output of the feedback inverter is connected to the first input of the NAND gate circuit through a fourth transfer gate. The second and third inputs of the NAND gate circuit are pulled up to a logical high level through P-channel MOS transistors. The first, second, third and fourth transfer gates and the P-channel MOS transistors are controlled by a clock signal in such a manner that when the first, second and third transfer gates are on, the fourth transfer gate and the P-channel MOS transistors are off, so that the NAND gate circuit performs a NAND operation in response to input signals applied to the first, second and third input terminals, and when the first, second and third transfer gates are off, the third transfer gate and the P-channel MOS transistors are on, so that a latch operation is performed to maintain a logical value on the output of the NAND gate circuit.
REFERENCES:
patent: 3739193 (1973-06-01), Pryor
patent: 4631420 (1986-12-01), Hollis et al.
patent: 4692635 (1987-09-01), Rapp
patent: 5111078 (1992-05-01), Miyamoto et al.
patent: 5173626 (1992-12-01), Kudou et al.
patent: 5175447 (1992-12-01), Kawasaki et al.
Callahan Timothy P.
NEC Corporation
Nu Ton My-Trang
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