Electronic digital logic circuitry – Interface – Current driving
Patent
1995-07-20
1996-10-22
Westin, Edward P.
Electronic digital logic circuitry
Interface
Current driving
326 57, H03K 190185
Patent
active
055680607
ABSTRACT:
Circuit board insertion circuitry is used in conjunction with a staggered electrical connector. The insertion circuitry includes an isolated circuit which receives a high system voltage upon first stage contact between the card and a high voltage bus, and uses that high system voltage to tristate the output of a transceiver on the circuit board prior to second stage contact being made between the transceiver and the backplane data bus. Override circuitry for overriding the tristating effects of the isolating circuit are provided such that when the bias circuit which controls the transceiver output is properly powered, the bias circuit will control the transceiver output, and not the isolated circuit. Additional circuitry which isolates the circuit board so that a power fault on the board will not impact other boards on the backplane is also provided. The additional circuitry preferably includes a relative large resistor and a Schottky diode which are provided in parallel between a 5 V bus and the protection diodes of the transceiver.
REFERENCES:
patent: 4044330 (1977-08-01), Johnson et al.
patent: 4912346 (1990-03-01), Mizuta
patent: 5023488 (1991-06-01), Gunning
patent: 5334882 (1994-08-01), Ting
patent: 5408146 (1995-04-01), Nguyen et al.
patent: 5485107 (1996-01-01), Lacey et al.
Berg Electronic's Assembly Specification for 2mm Connector part No. 70236-103, Jun. 8, 1994.
Bartholomay William G.
Ichiba Mikio S.
Parrella Eugene L.
Upp Daniel C.
Driscoll Benjamin D.
Gordon David P.
TranSwitch Corporation
Westin Edward P.
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