| ??? 08/30/05 12:19 Read: times |
#100276 - nope Responding to: ???'s previous message |
Where can you get H-series TTL parts?
That would be totally impossibe. Getting CMOS TTL parts??. I may have been a bit unclear when I said "I do, as a principle, use 74H buffers (74h24x) for anything that leave the box and does not go too far, for those cases where the distance is more than, say, 25cm I use 74AS24x." It is a weighing between the driving capability (74AS24x) and the noise margin (74h24x) and, of course the power consumption. However, when I said "as a rule, when 5V only, I use 74H (no C) they have a better noise margin" That is always true when no TTL is involved. Often I see HC parts in a 5V CMOS only schematic and that is selling the noise marginn down the river. Erik |
| 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 |