SAM7X256_14 Datasheet, PDF (593/662 Pages) ATMEL Corporation – ARM-based Flash MCU

38.8 AC Characteristics
38.8.1 Master Clock Characteristics
Table 38-19. Master Clock Waveform Parameters
Symbol
Parameter
Conditions
Min
1/(t_CPMCK)
Master Clock Frequency
38.8.2 I/O Characteristics
Criteria used to define the maximum frequency of the I/Os:
output duty cycle (30%-70%)
minimum output swing: 100mV to VDDIO - 100mV
Addition of rising and falling time inferior to 75% of the period
Table 38-20. I/O Characteristics
Symbol
Parameter
Conditions
FreqMax_I01
PulseminH_I01
PulseminL_I01
Pin Group 1 ⁽¹⁾ frequency
Pin Group 1 ⁽¹⁾ High Level Pulse Width
Pin Group 1 ⁽¹⁾ Low Level Pulse Width
FreqMax_I02
Pin Group 2 ⁽²⁾ frequency
Load: 40 pF⁽⁴⁾
Load: 40 pF⁽⁴⁾
Load: 40 pF⁽⁴⁾
Load: 40 pF⁽⁴⁾
Load: 20 pF⁽⁵⁾
PulseminH_I02 Pin Group 2 ⁽²⁾ High Level Pulse Width
Load: 40 pF⁽⁴⁾
Load: 20 pF⁽⁵⁾
PulseminL_I02 Pin Group 2 ⁽²⁾ Low Level Pulse Width
Load: 40 pF⁽⁴⁾
Load: 20 pF⁽⁵⁾
FreqMax_I03
Pin Group 3 ⁽³⁾ frequency
Load: 40 pF⁽⁴⁾
PulseminH_I03 Pin Group 3 ⁽³⁾ High Level Pulse Width
Load: 40 pF⁽⁴⁾
PulseminL_I03 Pin Group 3 ⁽³⁾ Low Level Pulse Width
Load: 40 pF⁽⁴⁾
Notes: 1. Pin Group 1 = PB27 to PB30
2. Pin Group 2 = PA4 to PA30 and PB0 to PB30
3. Pin Group 3 = PA0 to PA3
4. V_VDDIO from 3.0V to 3.6V, maximum external capacitor = 40pF
5. V_VDDIO from 3.0V to 3.6V, maximum external capacitor = 20pF
Min
40
40
20
10
20
10
16.6
16.6
Max
55
Max
12.5
25
30
30
Units
MHz
Units
MHz
ns
ns
MHz
MHz
ns
ns
ns
ns
MHz
ns
ns
SAM7X Series [DATASHEET]
6120K–ATARM–11-Feb-14
593