| ??? 02/24/05 18:41 Read: times |
#88372 - common clocks Responding to: ???'s previous message |
Actually, the X2 pin on most 80C51 devices can sink 10mA. It is the output of an inverter. The thing to keep in mind is that the X1 input of a '51 has a VIH of typically 0.7VDD. If the "downstream" part is a '51 family part, you might need to use an open-drain buffer with an external pullup to VDD to get that VIH drive. Done this for many years. |
| Topic | Author | Date |
| HCTL-2020 in India? | 01/01/70 00:00 | |
| optical interface | 01/01/70 00:00 | |
| Forum Abuse. | 01/01/70 00:00 | |
| what is wrong | 01/01/70 00:00 | |
| google get you there | 01/01/70 00:00 | |
| MOQ too high. | 01/01/70 00:00 | |
| Good Questions get Good answers | 01/01/70 00:00 | |
| I saw it | 01/01/70 00:00 | |
| Bouncy inputs | 01/01/70 00:00 | |
| got HCTL-2032 :-) | 01/01/70 00:00 | |
| clock sharing | 01/01/70 00:00 | |
| Re: Clock Sharing. | 01/01/70 00:00 | |
| the same clock | 01/01/70 00:00 | |
| Re: The same clock. | 01/01/70 00:00 | |
| you missed | 01/01/70 00:00 | |
| I think I am really missing something. | 01/01/70 00:00 | |
| clear as ink | 01/01/70 00:00 | |
| Re: Clear as ink. | 01/01/70 00:00 | |
| ah, | 01/01/70 00:00 | |
| Clear | 01/01/70 00:00 | |
| ...or | 01/01/70 00:00 | |
| common clocks | 01/01/70 00:00 | |
| ALE is great | 01/01/70 00:00 | |
| ALE clock | 01/01/70 00:00 | |
| ALE = fosc / 6 ! | 01/01/70 00:00 | |
| T2 max Fout= Fosc/2 | 01/01/70 00:00 | |
| good idea | 01/01/70 00:00 | |
| fmax != xtal / 4 | 01/01/70 00:00 | |
| You are right | 01/01/70 00:00 | |
| Oops Not Oleg, Peter | 01/01/70 00:00 | |
| use either | 01/01/70 00:00 | |
| Karma ... | 01/01/70 00:00 | |
| One Hot state machine | 01/01/70 00:00 | |
| One hot | 01/01/70 00:00 | |
| Index input in HCTL2032 | 01/01/70 00:00 | |
| Resets the counter | 01/01/70 00:00 | |
| I dont want to reset. | 01/01/70 00:00 | |
| Don't leave the index input floating | 01/01/70 00:00 | |
| index input | 01/01/70 00:00 | |
| probably active high | 01/01/70 00:00 | |
| page 13 of the datasheet fig12 | 01/01/70 00:00 | |
| Cotact details. | 01/01/70 00:00 | |
| Obsolescence Notice !!! | 01/01/70 00:00 | |
| Obsolescence of lead | 01/01/70 00:00 | |
| really the same PCN ??? | 01/01/70 00:00 | |
| that is strange | 01/01/70 00:00 | |
| Production | 01/01/70 00:00 | |
| not even true | 01/01/70 00:00 | |
| two questions | 01/01/70 00:00 | |
practical use | 01/01/70 00:00 |