| ??? 01/17/13 23:02 Read: times |
#189242 - ATF16V8CZ has Pin-keeper Responding to: ???'s previous message |
Koen De Ganck said:
I removed the GAL and the µC is running without pull-up. (I see activity on the databus )
It is pin 11 (OE) of an ATF16V8C2, but I have board with different variants. I think you mean ATF16V8CZ, (there is no C2), and yes, that part has Pin-keepers. You hit the jackpot ;) The Pin-keep is a snap-action light driver, that holds a pin H or L, but it does mean it can sink about 40uA, and that just trumps your 27uA PSEN. These light-current values are going to vary quite a lot in production. If you need the PLD, and want to avoid PCB changes, you could switch to the ATF16V8BQL, as that does not use Pin-keep; it has Pullups only. |
| Topic | Author | Date |
| Reset issue with new Atmel AT89LP51ED2 | 01/01/70 00:00 | |
| Do never use a µC from which only a preliminary... | 01/01/70 00:00 | |
| configuration settings | 01/01/70 00:00 | |
| what about negative reset? | 01/01/70 00:00 | |
| good idea but | 01/01/70 00:00 | |
| Some things to check... | 01/01/70 00:00 | |
| also try no LM810 at all | 01/01/70 00:00 | |
| reset is inverted | 01/01/70 00:00 | |
| no strange signals | 01/01/70 00:00 | |
| Extra modes ? | 01/01/70 00:00 | |
| pull-up on PSEN solves the problem | 01/01/70 00:00 | |
| small capacitor ? | 01/01/70 00:00 | |
| small capacitor | 01/01/70 00:00 | |
| side-stepping the problem? | 01/01/70 00:00 | |
| SST could be an option | 01/01/70 00:00 | |
| final status AT89LP51ED2 reset | 01/01/70 00:00 | |
| Clarifies | 01/01/70 00:00 | |
| loads on PSEN | 01/01/70 00:00 | |
| An isolated PSEN works fine ? | 01/01/70 00:00 | |
| GAL causes problem | 01/01/70 00:00 | |
| ATF16V8CZ has Pin-keeper | 01/01/70 00:00 | |
| 'Z' indeed | 01/01/70 00:00 | |
| ATF16V8BQL has Icc of ~1.5mA | 01/01/70 00:00 | |
'BQL' version could be an option | 01/01/70 00:00 |