Electronic digital logic circuitry – Interface – Current driving
Patent
1997-01-14
1999-06-29
Santamauro, Jon
Electronic digital logic circuitry
Interface
Current driving
321 80, 321 90, H03K 19018
Patent
active
059173416
ABSTRACT:
Low-side driver circuit (200) for data transmission applications includes external connection (202) for connecting and providing drive current to an external physical interface circuit. Sink transistor (210) forms an isolation from the physical interface circuit, and channels low-side drive current to external connection (202). Sink transistor (210) includes base (216), collector (208), and emitter (224). Emitter follower transistor (228) associates with sink transistor (210), and in conjunction with "A" input to the gate of transistor (228), sink transistor (210) controls the state of emitter follower transistor (228). Blocking transistor (206) associates with base (216) of sink transistor (210) to block the base of sink transistor (210) in the off state of sink transistor (210). Pull-down diodes (218) and (220) associate with base (216) of sink transistor (210) to pull down the voltage of the base when sink transistor (210) is in an off state.
REFERENCES:
patent: 5079447 (1992-01-01), Lien et al.
patent: 5177377 (1993-01-01), Mathuda et al.
patent: 5382845 (1995-01-01), Takahasi
Corsi Marco
Salamina Nicholas
Suder Edward C.
Brady III W. James
Donaldson Richard L.
Le Don Phu
Maginniss Christopher L.
Santamauro Jon
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