STR710FZ1 datasheet(65/78 Pages) STMICROELECTRONICS

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STR71xF

Electrical parameters

65/78

4.3.10

USB characteristics

The USB interface is USB-IF certified (Full Speed).

Figure 37.

USB: data signal rise and fall time

Table 39.

USB startup time

Symbol

Parameter

Conditions

Max

Unit

tSTARTUP

USB transceiver startup time

µs

Table 40.

USB DC characteristics

Symbol

Parameter

Conditions

Min.(1)(2)

All the voltages are measured from the local ground potential.

It is important to be aware that the DP/DM pins are not 5 V tolerant. As a consequence, in case of a a

shortcut with Vbus (typ: 5.0V), the protection diodes of the DP/DM pins will be direct biased . This will not

damage the device if not more than 50 mA is sunk for longer than 24 hours but the reliability may be

affected.

Max.(1)(2) Unit

Input Levels

VDI

Differential Input Sensitivity

I(DP, DM)

0.2

VCM

Differential Common Mode

Range

Includes VDI range

0.8

2.5

VSE

Single Ended Receiver

Threshold

1.3

2.0

Output Levels

VOL

Static Output Level Low

RL of 1.5 kΩ to 3.6V

(3)

RL is the load connected on the USB drivers

0.3

VOH

Static Output Level High

RL of 15 kΩ to VSS

(3)

2.8

3.6

Table 41.

USB: Full speed driver electrical characteristics

Symbol

Parameter

Conditions

Min

Max

Unit

Rise time(1)

Measured from 10% to 90% of the data signal. For more detailed information, please refer to USB

Specification - Chapter 7 (version 2.0).

CL=50 pF

420

Fall Time1)

CL=50 pF

trfm

Rise/ Fall Time matching

tr/tf

110

VCRS

Output signal Crossover Voltage

1.3

2.0

Differential

Data Lines

VSS

Crossover

points

VCRS

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