10.1.5.2.2 Input AC Characteristics

The following table provides the input requirements of the signals connected to I/O lines when they are configured as digital inputs. In particular, these values apply when the XIN input is used as a clock input of the device (main crystal oscillator set in Bypass mode). They do not apply for the XIN32 input which is designed for slow signals with frequencies up to 50 kHz. Parameters VIL and VIH defined in Table 10-15 apply.

Table 10-21. Input AC Characteristics
SymbolParametersConditionsMinMaxUnit
fINInput frequency(1)50MHz
tIN Input period20ns
tHIGHTime at high level8ns
tLOWTime at low level8ns
tRRise time2.2ns
tFFall time2.2ms
Note:
  1. The maximum input frequency may be limited by the peripheral receiving this signal.
Figure 10-7. Digital Input AC Characteristics