USB82642 datasheet(44/64 Pages) MICROCHIP

44 / 64 page

USB82642

DS60001253F-page 44

 2012-2021 Microchip Technology Inc.

8.2

Operating Conditions

Note 1: The TJ (junction temperature) must not exceed 125°C.

Note 2: The 3.3 V supply should be at least at 75% of its operating condition before the 1.8 V supply is allowed to

ramp up.

Note 3: Because there is no hysteresis on the RESET_N pin, slow rise times combined with noise on RESET_N

line can cause the hub to reset multiple times, placing the device into an unknown state. Therefore, if no

digital control is available, ensure a clean signal with a fast rise time on the RESET_N pin (i.e., use of low

resistance pull up resistor and small capacitor to filter out noise).

Parameter

Symbol

Min

Max

Units

Comments

Operating Temperature

-40

°C

Ambient temperature in still air.

(See Note 1)

3.3 V supply voltage

VDD33,

VDDA33

3.0

3.6

A 3.3 V regulator with an output

tolerance of ±1% must be used if

the output of the internal power

FET’s must support a 5% toler-

ance.

3.3 V supply rise time

tRT

400

µs

(Figure 8-1, "Supply Rise Time

Models")

1.8 V supply rise time

tRT

400

µs

(Figure 8-1, "Supply Rise Time

Models")

Voltage on any signal

--0.3

VDD33

Voltage on XTAL1

-0.3

2.0

FIGURE 8-1:

SUPPLY RISE TIME MODELS

t10%

10%

90%

Voltage

tRT

t90%

Time

100%

3.3 V

VSS

VDD33

t10%

10%

90%

Voltage

tRT

t90%

Time

100%

1.8 V

VSS

VDD18

USB82642 数据表(PDF) 44 Page - Microchip Technology

USB82642 数据表(HTML) 44 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64

数据表下载