| ??? 08/31/05 20:46 Read: times |
#100397 - Use a relay driver and sleep well ... Responding to: ???'s previous message |
I think Erik's original comment recommending a relay driver, e.g. UDN 280x is probably the easiest, yet most likely way to work out, irrespective of which end of the cable it occupies.
I'd say the remote end, i.e. the end away from the driven relays, is probably easiest, since the relay drivers have clamping diodes built in, and that will help deal with the inductive kickback from the cable and from the relay each time the relay's input circuit is released. A small cap might not be a bad thing either. At the ultra-leisurely pace at which relays operate, I'd not worry much about the performance aspect of this sort of interface. If you're worried about voltages outside the "nominal" range, clamping diode arrays, e.g. 74S1053 (TI) will help with that. Since relay inputs are current mode devices, a true-complement buffer, e.g 74265 might be worth a look. RE |
| Topic | Author | Date |
| driving ribboncabel - ESD precautions | 01/01/70 00:00 | |
| on interconnect | 01/01/70 00:00 | |
| Alternative | 01/01/70 00:00 | |
| comments. | 01/01/70 00:00 | |
| Recommended scheme | 01/01/70 00:00 | |
| 74H? | 01/01/70 00:00 | |
| nope | 01/01/70 00:00 | |
| Don't forget series termination | 01/01/70 00:00 | |
| series termination | 01/01/70 00:00 | |
| re: series termination | 01/01/70 00:00 | |
| an, in my opinion, much better way is to | 01/01/70 00:00 | |
| Series termination is the correct method | 01/01/70 00:00 | |
| both? | 01/01/70 00:00 | |
| Series termination prevents overshot | 01/01/70 00:00 | |
| HUH? | 01/01/70 00:00 | |
| Huh Huh? | 01/01/70 00:00 | |
| read the original post | 01/01/70 00:00 | |
| Think about the newbies | 01/01/70 00:00 | |
| That is exacltly why I always push the u | 01/01/70 00:00 | |
| RS485 is a good alternative, indeed | 01/01/70 00:00 | |
| Use a relay driver and sleep well ... | 01/01/70 00:00 | |
ferite bead, series termination, or | 01/01/70 00:00 |