Circuit and method for a transistor-transistor logic (TTL) compatible output drive
US6278293A · kind A · utility
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3References
27Claims
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Assignee
Inventor
Key dates
| Filing date | Dec 13, 1999 |
| Grant date | Aug 21, 2001 |
| Priority date | — |
| Expiry date | Dec 13, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K19/0136
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit (10) for providing TTL logic signals at an output (24) employs dual pull up devices (20, 30) at the output. The first device (20) is a bipolar transistor that acts as an emitter-follower to quickly pull up the output in response to applied logic signals to drive the output to a logic one state. Thereafter, the second device (30) which is a MOS transistor is turned on to drive the magnitude of the high logic output signal to substantially V.sub.CC, the positive power supply voltage supplied to the circuit (10).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.