| ??? 04/27/09 12:52 Read: times |
#164863 - IO expansion Responding to: ???'s previous message |
For 74165 following is very necessary
1. 10K or similar pullup at all input pins (control pins : not necessary) 2. Clock Inhibit to be grounded. http://www.sixca.com/micro/mcs51/ |
| Topic | Author | Date |
| Pulling to 0 | 01/01/70 00:00 | |
| chips | 01/01/70 00:00 | |
| 89C450 | 01/01/70 00:00 | |
| Set a pin as input | 01/01/70 00:00 | |
| Port pin as an input | 01/01/70 00:00 | |
| Put load on HCT output | 01/01/70 00:00 | |
| Checking | 01/01/70 00:00 | |
| I see what you want to do there ... but ... | 01/01/70 00:00 | |
| so check 74hc165 with resistive load only | 01/01/70 00:00 | |
| It's not uncommon... | 01/01/70 00:00 | |
| I know that some use antiques, but ... | 01/01/70 00:00 | |
| Do we mean the same? | 01/01/70 00:00 | |
| I asid 'modern', not Arghmel | 01/01/70 00:00 | |
| Come on, Erik.... | 01/01/70 00:00 | |
| now let me get this straight ... | 01/01/70 00:00 | |
| one thing I always do ... | 01/01/70 00:00 | |
| Shame on me! | 01/01/70 00:00 | |
| Oops! | 01/01/70 00:00 | |
| Been there, done that | 01/01/70 00:00 | |
IO expansion | 01/01/70 00:00 |