Datasheet

&3,
Data Sheet 49 1999-07

AC Characteristics

AC Characteristics

External Clock Drive XTAL1 (Standard Supply Voltage Range)
(Operating Conditions apply)
Parameter Symbol Direct Drive
1:1
Prescaler
2:1
PLL
1:N
Unit
min. max. min. max. min. max.
Oscillator period
W
OSC
SR 40 – 20 – 60
1)
1) The minimum and maximum oscillator periods for PLL operation depend on the selected CPU clock generation
mode. Please see respective table above.
500
1)
ns
High time
2)
2) The clock input signal must reach the defined levels
9
IL
and
9
IH2
.
W
1
SR 20
3)
3) The minimum high and low time refers to a duty cycle of 50%. The maximum operating frequency (I
CPU
) in
direct drive mode depends on the duty cycle of the clock input signal.
–6–10–ns
Low time
2)
W
2
SR 20
3)
–6–10–ns
Rise time
2)
W
3
SR–10–6–10ns
Fall time
2)
W
4
SR–10–6–10ns
External Clock Drive XTAL1 (Reduced Supply Voltage Range)
(Operating Conditions apply)
Parameter Symbol Direct Drive
1:1
Prescaler
2:1
PLL
1:N
Unit
min. max. min. max. min. max.
Oscillator period
W
OSC
SR 50 – 25 – 60
1)
1) The minimum and maximum oscillator periods for PLL operation depend on the selected CPU clock generation
mode. Please see respective table above.
500
1)
ns
High time
2)
2) The clock input signal must reach the defined levels 9
IL
and 9
IH2
.
W
1
SR 25
3)
3) The minimum high and low time refers to a duty cycle of 50%. The maximum operating frequency (I
CPU
) in
direct drive mode depends on the duty cycle of the clock input signal.
–8–10–ns
Low time
2)
W
2
SR 25
3)
–8–10–ns
Rise time
2)
W
3
SR–10–6–10ns
Fall time
2)
W
4
SR–10–6–10ns