USB3250 datasheet(10/46 Pages) MICROCHIP

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USB3250

DS00002142A-page 10

 2013 - 2016 Microchip Technology Inc.

5.0

LIMITING VALUES

Note 5-1

The USB 2.0 Specification requires a frequency accuracy of +/-500ppm. For applications using a

quartz crystal, Microchip recommends that it be specified with an accuracy of +/-100ppm. Resonators

that are specified to meet the +/-500ppm accuracy have also been used successfully with the

USB3250.

FIGURE 5-1:

ABSOLUTE MAXIMUM RATINGS

Parameter

Symbol

Conditions

MIN

TYP

MAX

Units

1.8V Supply Voltage

(VDD1.8 and VDDA1.8)

VDD1.8

-0.5

TBD

3.3V Supply Voltage

(VDD3.3 and VDDA3.3)

VDD3.3

-0.5

4.6

Input Voltage

-0.5

4.6

Storage Temperature

TSTG

-40

+125

[1] Equivalent to discharging a 100pF capacitor via a 1.5k

 resistor (HBM).

Note:

In accordance with the Absolute Maximum Rating System (IEC 60134).

FIGURE 5-2:

RECOMMENDED OPERATING CONDITIONS

Parameter

Symbol

Conditions

MIN

TYP

MAX

Units

1.8V Supply Voltage

(VDD1.8 and VDDA1.8)

VDD1.8

1.6

1.8

2.0

3.3V Supply Voltage

(VDD3.3 and VDDA3.3)

VDD3.3

3.0

3.3

3.6

Input Voltage on Digital Pins

0.0

VDD3.3

Input Voltage on Analog I/O

Pins (DP, DM)

VI(I/O)

0.0

VDD3.3

Ambient Temperature

-40

+85

FIGURE 5-3:

RECOMMENDED EXTERNAL CLOCK CONDITIONS

Parameter

Symbol

Conditions

MIN

TYP

MAX

Units

System Clock Frequency

XO driven by the external

clock; and no connection

at XI

(+/- 100ppm)

Note 5-1

MHz

System Clock Duty Cycle

XO driven by the external

clock; and no connection

at XI

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