ST7261 datasheet(67/80 Pages) STMICROELECTRONICS

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ST7261

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11.10 COMMUNICATION INTERFACE CHARACTERISTICS

11.10.1 USB - Universal Bus Interface

(Operating conditions T

A = 0 to +70°C, V

DD = 4.0 to 5.25V unless otherwise specified)

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

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

Note 3: Not tested in production, guaranteed by design.

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

to the USBVCC pin.

Figure 55. USB: Data Signal Rise and Fall Time

Table 17. 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

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

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

Note 1,CL=50 pF

Note 1, CL=600 pF

300

Fall Time

Note 1, CL=50 pF

Note 1, CL=600 pF

300

Rise/ Fall Time matching

trfm

tr/tf

120

Output signal Crossover

Voltage

VCRS

1.3

2.0

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