| ??? 03/24/06 14:10 Read: times |
#112974 - Entirely not correct Responding to: ???'s previous message |
A part with 'true' TTL levels has a Vih of 2.0V and a Voh of 2.4V; a noise margin of 400mV.
An F124, with its port configured as push-pull will easily deliver a Voh of 3V or more. That's a noise margin of 1V. A part with 'true' CMOS levels has a Vih of 3.8V and thus incompatible with any 3.3V logic. That is why I advised a part with TTL levels. Rob. |
| Topic | Author | Date |
| interfacing 5V SRAM to 3.3V micro | 01/01/70 00:00 | |
| level convertor | 01/01/70 00:00 | |
| Which part? | 01/01/70 00:00 | |
| not entirely correct | 01/01/70 00:00 | |
| 'scuse me? | 01/01/70 00:00 | |
| compared to 3V3 to 3V3 or 5V to 5V | 01/01/70 00:00 | |
| Entirely not correct | 01/01/70 00:00 | |
| IDT7005L20J | 01/01/70 00:00 | |
| "Using C8051Fxxx in 5 Volt Systems"... | 01/01/70 00:00 | |
comments on the appnote | 01/01/70 00:00 |