Voltage tolerant oscillator input cell
US6181214A · kind A · utility
2Cited by
1References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 24, 1999 |
| Grant date | Jan 30, 2001 |
| Priority date | — |
| Expiry date | Nov 24, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K3/0307
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An integrated circuit oscillator input cell has an oscillator input pad, an oscillator feedback pad, a core terminal, an inverter and an electrostatic discharge protection circuit. The inverter has an inverter input, which is coupled to the oscillator input pad, and an inverter output, which is coupled to the oscillator feedback pad and the core terminal. The electrostatic discharge protection circuit includes a plurality of N-channel protection transistors, which are coupled to the oscillator input pad. The N-channel protection transistors are the only protection transistors that are coupled to the oscillator input pad.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.