Clock Standards

Standard values of the system clock input

Frequency: 48MHz ± 100ppm

Input Duty: Must be within 50% ± 5%.

Power-up Procedures

V

t

VDDK(=1.8V)

VDDC,VIO(=1.8 to 3.3V)

V

t

VDDK(=1.8V)

VDDC,VIO(=1.8 to 3.3V)

V

V

Recommended Power-Up Procedure

Allowable Limit of Power-Up Procedure

Turn on the core power supply VDDK before you turn on the VDDC

and VIO power supply and shut it down later

If you want to turn on the core power supply VDDK after you turn on VDDC

and VIO power supply, you must keep V = VIO-VDDK < 0.5V during

the time before VDDK becomes stable