| ??? 09/03/11 12:37 Read: times |
#183613 - Not good! Responding to: ???'s previous message |
Raj said:
Now, can I not replace the NOT gate with a single inexpensive transistor? 340 runs at 48 MHz. What problems should I expect? A single transistor cannot be recommended here because not only the propagation delay time must be short but eventually also the rise and fall times to fullfill input rise time specification of load. Also, the output impedance of a CMOS inverter is usually in the range of characteristic line impedance of signal line and by this automatically avoids heavy reflections and ringing. A transistor inverter, on the other hand, has a pull-up resistor which is much higher than the characteristic impedance of line and a turn-on resistance which is much lower. A single CMOS inverter chip, as already Michael mentioned, is a much better choice. There are tons of them: http://uk.rs-online.com/web/c/sem...per%20Chip Kai Klaas |
| Topic | Author | Date |
| A transistor in place of a not gate | 01/01/70 00:00 | |
| Saturated Switching Transistor | 01/01/70 00:00 | |
| Cost | 01/01/70 00:00 | |
| single gate inverter | 01/01/70 00:00 | |
| Invert Your Address | 01/01/70 00:00 | |
| Good suggestion | 01/01/70 00:00 | |
| Not good! | 01/01/70 00:00 | |
Thanks | 01/01/70 00:00 |