49.5.2.2 Input AC Characteristics

The table below 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 100 kHz. Parameters V_IL and V_IH are defined in Output DC Characteristics.

Table 49-12. Input AC Characteristics
Symbol	Parameter	Conditions	Min	Max	Units
f_IN	Input frequency⁽¹⁾	–	10	50	MHz
t_IN	Input period	–	20	100	ns
Duty	Duty cycle	–	40	60	%
t_HIGH	Time at high level	–	8	60	ns
t_LOW	Time at low level	–	8	60	ns
t_R	Rise time	–	–	10	ns
t_F	Fall time	–	–	10	ns

Note:

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

Figure 49-5. Digital Input AC Characteristics