Single-port network node transceiver with powered-down protectio

Details Single-port network node transceiver with powered-down protectio Single-port network node transceiver with powered-down protectio

1994-03-09

1996-02-06

Tse, Young

Pulse or digital communications

Cable systems and components

375219, 375258, 327208, H04B 300, H04B 138

Patent

active

054901715

ABSTRACT:
A single-port network node transceiver that does not draw any substantial current from the network when it is powered-down, enabling it to meet the ISDN powered-down loading specification when built on a CMOS integrated circuit chip. The pull-up transistors of the transmitter output circuit each have means for shorting the well terminal to source terminal connection when the circuit is operating and opening the connection when the power to the transceiver is shut down. The opening of this connection prevents the well-substrate junction of the pull-up transistors from becoming forward biased and drawing current from the network when the power to the transceiver is off and there is voltage present on the network. The transceiver also includes a plurality of ESD overvoltage protection diodes in series between the power supply rail and each input/output terminal. Since multiple diodes are connected in series and their voltage drops are added together, the diodes also do not draw current from the network when the transceiver is powered down.

REFERENCES:
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patent: 4636654 (1987-01-01), Lach
patent: 4709296 (1987-11-01), Hung et al.
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patent: 4953055 (1990-08-01), Douhet et al.
patent: 5003579 (1991-03-01), Jones
patent: 5077756 (1991-12-01), Christophersen
patent: 5095291 (1992-03-01), Staschover et al.
patent: 5142429 (1992-08-01), Jaki
IBM Technical Disclosure Bulletin vol. 23 No. 8 Jan. 1981.

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