ST7263BHX datasheet(123/145 Pages) STMICROELECTRONICS

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14.10 Communication interface characteristics

14.10.1 USB - universal bus interface

(Operating conditions T

A = 0 to +70°C, V

DD = 4.0 to 5.25V unless otherwise specified)

Notes:

1. RL is the load connected on the USB drivers.

2. All the voltages are measured from the local ground potential.

3. To improve EMC performance (noise immunity), it is recommended to connect a 100nF capacitor to the USBVCC pin.

Figure 72. USB: data signal rise and fall time

Table 27. USB: low-speed electrical characteristics

Note:

1. For more detailed information, please refer to Chapter 7 (Electrical) of the USB specification (version 1.1).

USB DC electrical characteristics

Symbol

Parameter

Conditions

Min.

Max.

Unit

VDI

Differential Input Sensitivity

I(D+, D-)

0.2

V 2)

VCM

Differential Common mode

Range

Includes VDI range

0.8

2.5

VSE

Single Ended Receiver Threshold

0.8

2.0

VOL

Static Output Low

RL 1) of 1.5K ohms to

3.6v

0.3

VOH

Static Output High

RL 1) of 15K ohms to

VSS

2.8

3.6

USBV

USBVCC: voltage level 3)

VDD=5v

3.00

3.60

Differential

Data Lines

VSS

Crossover

points

VCRS

Symbol

Parameter

Conditions

Min

Max

Unit

Driver characteristics:

Rise time

CL=50 pF 1)

CL=600 pF 1)

300

Fall Time

CL=50 pF 1)

CL=600 pF 1)

300

trfm

Rise/ Fall Time matching

tr/tf

120

VCRS

Output signal Crossover

Voltage

1.3

2.0

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