| ??? 11/26/04 16:05 Read: times |
#82026 - With Schottkys either... Responding to: ???'s previous message |
Michael said:
Totally unreliable !! Exact and very nicely explained! And even if one thinks about the use of Schottky diodes like 1N6263 or similar, which only show about 0.35...0.4V forward voltage drop across the junction, this diode gate remains critical. Why? Because if noise hits the line behind the diodes, means the /EN line of HCT gate in your picture, for instance due to charge injection via stray capacitance, then potential can also rise well above this 0.8V limit. With these diodes there's no noise margin any more! Kai |
| Topic | Author | Date |
| Regarding RD and RW pins | 01/01/70 00:00 | |
| Funeral Ceremony | 01/01/70 00:00 | |
| AND gate | 01/01/70 00:00 | |
| ...or roll your own AND gate | 01/01/70 00:00 | |
| Roll your own | 01/01/70 00:00 | |
| Why roll your own? | 01/01/70 00:00 | |
| why? | 01/01/70 00:00 | |
| the reason | 01/01/70 00:00 | |
| 74155 | 01/01/70 00:00 | |
| The micro may not burn | 01/01/70 00:00 | |
| Do Not Use The Diodes Scheme | 01/01/70 00:00 | |
| With Schottkys either... | 01/01/70 00:00 | |
No need | 01/01/70 00:00 | |
| Other use... and othe configuration | 01/01/70 00:00 | |
| Headaches or not... | 01/01/70 00:00 | |
| derivative depended | 01/01/70 00:00 | |
| Don't worry i used a gate.. | 01/01/70 00:00 |