Microchip MPF200TL handleiding
Handleiding
Je bekijkt pagina 10 van 102
DC Characteriscs
Data Sheet
© 2024 Microchip Technology Inc. and its subsidiaries
DS00003831E - 10
Table 4-4. Minimum and Maximum Rise and Fall Times
Parameter Symbol Min Max Unit Maximum
Frequency
Condition
Input rise time
1,4
Input fall time
1,4
T
RISE
T
FALL
200 ps
2,3
10% signal period ps F ≤ 100 KHz Min (10% signal
period, 1 μs)
5
12.5% signal period ps 100 KHz < F ≤
400 KHz
Min (12.5% signal
period, 300 ns)
6
20% signal period ps 400 KHz < F ≤
50 MHz
Min (20% signal
period, 50 ns)
7
4 ns 50 MHz < F ≤
125 MHz
Not to exceed 4 ns
8
50% signal period ns 125 MHz < F
≤ 800 MHz
Sawtooth waveform
9
1. Voltage ramp must be monotonic. For single-ended I/O standards, input rise time is specied
from 10%–90% of V
DDIx
and input fall time is specied from 90%–10% of V
DDIx
. For voltage
referenced and dierential I/O congurations, ramp times must always comply with I/O standard
requirements to ensure compliance.
2. Input slew rates must be controlled to never exceed PAD overshoot/undershoot requirements.
Input pad overshoot and undershoot specications are shown in section Maximum Allowed
Overshoot and Undershoot.
3. Rise and fall times in this table are for unterminated inputs. When inputs are terminated,
minimum ramp time is not restricted. Recommended minimum ramp time is 25% of bit period,
not to exceed a rate of 5 V/ns.
4. Ramp times must not exceed I/O standard requirements to ensure compliance.
5. For signal frequencies <100 KHz, maximum rise time is 1 μs. For example, if signal frequency
(F) is 100 KHz, 10% of signal period is 1 μs. The maximum ramp time allowed is the 1 μs limit.
However, if signal frequency is 10 KHz, then 10% of signal period is 10 μs which exceeds the
maximum limit of 1 μs. The maximum ramp time allowed is therefore 1 μs.
6. For 100 KHz < signal frequencies ≤ 400 KHz, maximum rise time is 300 ns. For example, if signal
frequency is 400 KHz, then 12.5% of signal period is 312.5 ns. The maximum ramp time allowed
is 300 ns. If the signal frequency is 200 KHz, then 12.5% of signal period is 625 ns. The maximum
ramp time allowed is therefore 300 ns.
7. For 400 KHz < signal frequencies ≤ 50 MHz, maximum rise time is 50 ns or 20% of signal period,
whichever is less. For example, if signal frequency is 50 MHz, then 20% of signal period is 4 ns.
The maximum ramp time allowed is therefore 4 ns, even if the max limit is 50 ns. If the signal
frequency is 1 MHz, then 20% of signal period is 200 ns. The maximum ramp time allowed is
therefore 50 ns.
8. For 50 MHz < signal frequencies ≤ 125 MHz, maximum rise time is 4 ns. For example, if signal
frequency is 125 MHz, then the maximum ramp time allowed is 4 ns (sawtooth signal). If the
signal frequency is 75 MHz, the maximum ramp time allowed at 75 MHz is still 4 ns.
9. For 125 MHz < signal frequencies ≤ 800 MHz, maximum rise time is 50% of signal frequency
(sawtooth signal). For example, if signal frequency is 250 MHz, then the maximum ramp time
allowed is 2 ns. If the signal frequency is 800 MHz, the maximum ramp time allowed is 0.625 ns.
4.2.2 Maximum Allowed Overshoot and Undershoot
During transitions, input signals may overshoot and undershoot the voltage listed as follows. Input
currents must be limited to less than 100 mA per latch-up specications.
The maximum overshoot duration is specied as a high-time percentage over the lifetime of the
device. A DC signal is equivalent to 100% of the duty cycle.
Bekijk gratis de handleiding van Microchip MPF200TL, stel vragen en lees de antwoorden op veelvoorkomende problemen, of gebruik onze assistent om sneller informatie in de handleiding te vinden of uitleg te krijgen over specifieke functies.
Productinformatie
| Merk | Microchip |
| Model | MPF200TL |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 18409 MB |
