ST7262 datasheet(117/139 Pages) STMICROELECTRONICS

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12.11 COMMUNICATION INTERFACE CHARACTERISTICS

12.11.1 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. Not tested in production, guaranteed by design.

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

USBVCC pin.

Figure 77. USB: Data Signal Rise and Fall Time

Table 26. USB: Low-speed Electrical Characteristics

Note 1: Measured from 10% to 90% of the data signal. For more detailed informations, please refer to Chapter 7 (Elec-

trical) of the USB specification (version 1.1).

USB DC Electrical Characteristics

Parameter

Symbol

Conditions 2)

Min.

Max.

Unit

Differential Input Sensitivity

VDI

I(D+, D-)

0.2 3)

Differential Common Mode Range

VCM

Includes VDI range

0.8 3)

2.5 3)

Single Ended Receiver Threshold

VSE

0.8 3)

2.0 3)

Static Output Low

VOL

RL of 1.5K ohms to 3.6V 1)

0.3

Static Output High

VOH

RL of 15K ohms to VSS

2.8

3.6

USBVCC: voltage level 4)

USBV

VDD=5V

3.00

3.60

Differential

Data Lines

VSS

Crossover

points

VCRS

Parameter

Symbol

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

Rise/ Fall Time matching

trfm

tr/tf

120

Output signal Crossover

Voltage

VCRS

1.3

2.0

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