High speed carry chain

Details High speed carry chain High speed carry chain

1988-08-15

1989-12-05

Malzahn, David H.

Boots, shoes, and leggings

364770, G06F 750

Patent

active

048857165

ABSTRACT:
A carry chain includes a plurality of carry latches (20') which are disposed along a carry propagating line (12) to propagate a carry signal to a latch node (18). During precharge of the latch node (18), a precharge transistor (26') pulls the node to a logic one. During the precharge cycle, an N-channel transistor (34) which is a portion of the latch (20') is disconnected from the latch node (18) by a transistor (38). After the precharge cycle, this N-channel transistor (34) is reconnected to the latch node (18). This provides a low source impedance to quickly discharge the associated latch nodes (18) as the carry propagates along the carry chain (12).

REFERENCES:
patent: 3947671 (1976-03-01), Geng et al.
patent: 4152775 (1979-05-01), Schwartz
patent: 4338676 (1982-07-01), Briley
patent: 4357675 (1982-11-01), Freyman
patent: 4563751 (1986-01-01), Barker
patent: 4623981 (1986-11-01), Wolrich et al.
patent: 4807176 (1989-02-01), Yamada et al.

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