USB2251 datasheet(35/43 Pages) MICROCHIP

номер детали	USB2251

подробное описание детали	Ultra Fast USB 2.0 Multi-Slot Flash Media Controller

PDF	43 Pages

Scroll/Zoom	100%

производитель	MICROCHIP [Microchip Technology]

домашняя страница	http://www.microchip.com

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35 / 43 page

USB2250/50i/51/51i

DS00002005A-page 35

 2009 - 2015 Microchip Technology Inc.

Note 9-3

When powering the device, the maximum power supply ramp time should be set at a rate faster than

400

s. This speed is important to ensure that the device resets properly. Measure rise time at 10%

and 90%.

9.2

Operating Conditions

Note 9-4

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% tolerance.

9.3

DC Electrical Characteristics

Parameter

Symbol

MIN

MAX

Units

Comments

Operating

Temperature

Commercial Part

Industrial Part

-40

°C

Ambient temperature in still air.

3.3 V supply voltage

VDD33

3.0

3.6

(Note 9-4)

3.3 V supply rise time

tRT

400

s

(See Figure 9-1 and Note 9-3)

Voltage on

USB+ and USB- pins

-0.3

5.5

If any 3.3 V supply voltage drops

below 3.0 V, then the MAX

becomes:

(3.3 V supply voltage) + 0.5

5.5

Voltage on any signal

-0.3

VDD33

Voltage on XTAL1

-0.3

VDD33

Voltage on XTAL2

-0.3

VDD18

Parameter

Symbol

MIN

TYP

MAX

Units

Comments

I, IPU, IPD Type Input Buffer

Low Input Level

High Input Level

Pull Down

Pull Up

VILI

VIHI

2.0

0.8

A

TTL Levels

IS Type Input Buffer

Low Input Level

High Input Level

Hysteresis

VILI

VIHI

VHYSI

2.0

420

0.8

TTL Levels

ICLK Input Buffer

Low Input Level

High Input Level

Input Leakage

VILCK

VIHCK

IIL

1.4

-10

0.5

+10

A

VIN = 0 to VDD33

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