Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1989-05-30
1992-01-28
Miller, Stanley D.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307241, 307243, 307481, 375 7, H03K 19092, H03K 19094, H04B 138, H04L 2502
Patent
active
050846370
ABSTRACT:
A bidirectional level shifting interface circuit has first and second I/O ports and an FET with a drain-source channel connected between the first and second I/O ports. The first I/O port is connected to an I/O port of a first digital circuit operating at a relatively low supply voltage, and the second I/O port is connected to an I/O port of a second digital circuit operating at a relatively high supply voltage. This channel passes communication signals in each direction between the first and second digital circuit. A latching circuit comprising a P Channel FET is biased by the relatively high voltage supply, has an output connected to the second I/O port, and has a control input. The interface circuit further comprises an inverter circuit having a control input connected to the second I/O port and an inverted output connected to the control input of the latching FET such that when the second I/O port exhibits a binary one voltage caused by the first digital circuit, the inverted output exhibits a binary zero voltage to activate the P Channel FET to latch the second I/O port at sufficient voltage to drive the second digital circuit at binary one level.
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Bertelson David R.
International Business Machines Corp.
Miller Stanley D.
Samodovitz Arthur J.
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