| ??? 06/20/03 13:25 Read: times |
#48900 - RE: Port 0 (Back post) Responding to: ???'s previous message |
The value of the pullup is, in most cases not related to device load (today most anything is CMOS). I determine the value of the pullup based in the amount of parasitic capacitance the signals have and the speed of the bus. So good grab values are 10k for static signals (e.g. dip switches) and 2k2 for most dynamic signals. Going lower than 2k2 (and for some derivatives even 2k2) may get you in trouble with the max port current/dissapation.
Erik |
| Topic | Author | Date |
| Port 0 (Back post) | 01/01/70 00:00 | |
| RE: Port 0 (Back post) | 01/01/70 00:00 | |
| RE: Port 0 (Back post) | 01/01/70 00:00 | |
| More details needed! | 01/01/70 00:00 | |
| RE: Port 0 (Back post) | 01/01/70 00:00 | |
| RE: Port 0 (Back post) | 01/01/70 00:00 | |
| RE: Port 0 (Back post) | 01/01/70 00:00 | |
| RE: Port 0 (Back post) | 01/01/70 00:00 | |
| RE: Port 0 (Back post) | 01/01/70 00:00 | |
| RE: Port 0 (Back post) | 01/01/70 00:00 | |
| RE: Port 0 (Back post) | 01/01/70 00:00 | |
| RE: Port 0 (Back post),erik | 01/01/70 00:00 | |
| It's not your mistake, Pranav... | 01/01/70 00:00 | |
| RE: Port 0 (Back post) | 01/01/70 00:00 | |
| RE: Port 0 (Back post) | 01/01/70 00:00 | |
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| RE: copper trace capacitance | 01/01/70 00:00 | |
RE: Port 0 (Back post) | 01/01/70 00:00 |