UPD720122 datasheet(65/82 Pages) NEC

65 / 82 page

Data Sheet S16685EJ2V0DS

µPD720122

2.6.5

USB interface timing

Parameter

Symbol

Conditions

Min.

Max.

Unit

Full-speed source electrical characteristics

Rise time

TFR

CL = 50 pF,

RS = 36

Ω

420

Fall time

TFF

CL = 50 pF,

RS = 36

Ω

420

Differential rise and fall time matching

TFRFM

(TFR/TFF)

111.11

Full-speed data rate for hubs and devices

that are high-speed capable

TFDRATHS

Average bit rate

11.9940

12.0060

Mb/s

Frame interval

TFRAME

0.9995

1.0005

Consecutive frame interval jitter

TRFI

No clock adjustment

Source jitter total (including frequency

tolerance):

To next transition

For paired transitions

TDJ1

TDJ2

−3.5

−4.0

3.5

4.0

Source jitter for differential transition to SE0

transition

TFDEOP

−2

5ns

Receiver jitter:

To next transition

For paired transitions

TJR1

TJR2

−18.5

−9

18.5

Source SE0 interval of EOP

TFEOPT

160

175

Receiver SE0 interval of EOP

TFEOPR

Width of SE0 interval during differential

transition

TFST

High-speed source electrical characteristics

Rise time (10% to 90%)

THSR

500

Fall time (10% to 90%)

THSF

500

Driver waveform requirements

See Figure 2-6

High-speed data rate

THSDRAT

479.760

480.240

Mb/s

Microframe interval

THSFRAM

124.9375

125.0625

µs

Consecutive microframe interval difference

THSRFI

4 high-speed

Bit times

Data source jitter

See Figure 2-6.

Receiver jitter tolerance

See Figure 2-4.

UPD720122 Datasheet(PDF) 65 Page - NEC

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