Input/output module with latches
US5017813A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 11, 1990 |
| Grant date | May 21, 1991 |
| Priority date | — |
| Expiry date | May 11, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/01759
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An input/output module circuit for providing input/output interface functions in integrated circuits includes an input section and an output section electrically connected to an I/O pad of the integrated circuit. The input section includes an input buffer/level shifter for translating the logic signals from the outside world to CMOS compatible levels. The input buffer may be placed in a high impedance state by a control signal applied to a control input. The output of the input buffer/level shifter is connected to a first data input of a two-input multiplexer. The output of the two-input multiplexer is connected to an internal bus and to the second data input of the two-input multiplexer. The select input of the two-input multiplexer is connected to a control signal, preferably to the same control signal used to enable the input buffer/level shifter. The output section of the input/output module section of the present invention includes a two-input multiplexer having a first input connected to an internal data bus, and its output fed back to its second data input. Its select input is driven from a control signal. The output of the two-input multiplexer is also connected to the inpu…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.