Thu Thi Do

US Patent:

61752533, Jan 16, 2001

Filed:

Mar 31, 1998

Appl. No.:

9/052883

Inventors:

Subramaniam Maiyuran - Fair Oaks CA
Sanjay Dabral - Milpitas CA
Thu M. Do - Rancho Cordova CA
Scott E. Siers - Elk Grove CA
Mehrdad Mohebbi - Folsom CA

Assignee:

Intel Corporation - Santa Clara CA

International Classification:

H03K 1902
H03K 19096
H03K 1900

US Classification:

326 86

Abstract:

A driver to drive a bus with a pullup and a pulldown transistor according to a data signal during a drive phase and to charge or discharge the bus to intermediate voltage levels during a precondition phase using the pullup and pulldown transistors, the driver comprising a buffer and latch to latch the bus voltage at the end of a drive phase; a precondition circuit responsive to the latch to switch ON a pullup transistor at the beginning of a precondition phase when the bus voltage was LOW in the previous drive phase so as to charge the bus voltage to a first voltage less than a supply voltage, and to switch ON a pulldown transistor at the beginning of the precondition phase when the bus voltage was HIGH in the previous drive phase so as to discharge the bus voltage to a second voltage above ground.