11.1.6.2.2 Input AC Characteristics

The following table provides the input characteristics of the I/O lines when configured as a digital input. 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 V_IL and V_IH defined in Table 11-16 apply.

Table 11-23. Input AC Characteristics
Symbol	Parameter	Min	Max	Units
f_IN	Input frequency⁽¹⁾	–	50	MHz
t_IN	Input period	20	–	ns
t_HIGH	Time at high level	8	–	ns
t_LOW	Time at low level	8	–	ns
t_R	Rise time	–	2.2	ns
t_F	Fall time	–	2.2	ns

Note:

The maximum input frequency may be limited by the peripheral receiving this signal.

Figure 11-9. Digital Input AC Characteristics