| ??? 02/24/06 05:26 Read: times |
#110645 - IOL = 10mA or 1.6mA? in port 1 Responding to: ???'s previous message |
suresh said:
Doubt: Does that mean that p1.x could sink 10 mA when kept low. So, i would like to know what does this IOL = 10mA signify. Kai Klaas said:
The term "IOL" has a very certain meaning in datasheets. It means, that if the output is low, concretely spoken if the NMOS-FET of output stage is turned-on and the PMOS-FET is turned-off, that then a current of up to 10mA is allowed to flow into the output pin, through the NMOS-FET and finally to ground. Kai Yes. But the datasheet also says that IOL = 1.6mA at .45 V max (VOL) So iam confused of which value of IOL should be taken when the output is low. i.e., when the output of p1.x = 0 , (made to logic 0 in the SFR of port1) Then IOL of p1.x = 1.6 mA or 10 mA? Kindly let me know for any reasons in choosing a particular IOL value out of the two. Thanking you , suresh. |
| Topic | Author | Date |
| AT89s52 Port pin clarifications: | 01/01/70 00:00 | |
| nice copy, where is the question | 01/01/70 00:00 | |
| output characteristics | 01/01/70 00:00 | |
| most confusing post | 01/01/70 00:00 | |
| Answers | 01/01/70 00:00 | |
| Logic 1 to 0 transition | 01/01/70 00:00 | |
| You haven't read the 'bible' chapter... | 01/01/70 00:00 | |
| no details about transition from logic 1 | 01/01/70 00:00 | |
| other way 'round | 01/01/70 00:00 | |
| There ARE!! | 01/01/70 00:00 | |
| pFET2 | 01/01/70 00:00 | |
| Weak and very weak pull-ups | 01/01/70 00:00 | |
| maintaining low source impedence? | 01/01/70 00:00 | |
| by making thje driver a sink............ | 01/01/70 00:00 | |
| Pull-downs create problems | 01/01/70 00:00 | |
| Maximum IOL per port pin: 10 mA ? | 01/01/70 00:00 | |
| IOL | 01/01/70 00:00 | |
| IOL = 10mA or 1.6mA? in port 1 | 01/01/70 00:00 | |
Depends on load | 01/01/70 00:00 |