Electrical characteristics

ST7GEME4

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4.8

Communication interface characteristics

Figure 7.

USB data signal rise and fall time

Table 23.

1.

RL is the load connected on the USB drivers. All the voltages are measured from the local ground

potential.

Parameter

Symbol

Conditions

Min.

Max.

Unit

Input Levels

Differential input sensitivity

VDI

I(D+, D-)

0.2

V

Differential common mode

range

VCM

Includes VDI range

0.8

2.5

V

Single ended receiver

threshold

VSE

1.3

2.0

V

Output levels

Static output low

VOL

RL of 1.5 k

Ω to 3.6 V

0.3

V

Static Output high

VOH

RL of 15 k

Ω to V

SS

2.8

3.6

V

USBVCC: voltage level

USBV

3.00

3.60

V

Table 24.

USB full speed electrical characteristics

Parameter

Symbol

Conditions

Min

Max

Unit

Driver characteristics:

Rise time

1.

Measured from 10% to 90% of the data signal. For more detailed informations, please refer to Chapter 7

(Electrical) of the USB specification (version 1.1).

420

ns

Fall time

CL = 50 pF(1)

420

ns

Rise/ fall time

matching

90

110

%

Output signal

crossover Voltage

VCRS

1.3

2.0

V

Differential

Data Lines

tf

tr

Crossover

points

VCRS