LPC2921 datasheet(66/83 Pages) NXP

66 / 83 page

LPC2921_23_25_1

Preliminary data sheet

Rev. 01 — 15 June 2009

66 of 83

NXP Semiconductors

LPC2921/2923/2925

ARM9 microcontroller with CAN, LIN, and USB

9.2 USB interface

[1]

Characterized but not implemented as production test. Guaranteed by design.

Table 34.

Dynamic characteristics: USB pins (full-speed)

CL = 50 pF; Rpu = 1.5 kΩ on D+ to VDD(3V3), unless otherwise speciﬁed.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

rise time

10 % to 90 %

8.5

13.8

fall time

10 % to 90 %

7.7

13.7

tFRFM

differential rise and fall time

matching

tr/tf

109

VCRS

output signal crossover voltage

1.3

2.0

tFEOPT

source SE0 interval of EOP

see Figure 23

160

175

tFDEOP

source jitter for differential transition

to SE0 transition

see Figure 23

−2

tJR1

receiver jitter to next transition

−18.5

+18.5

tJR2

receiver jitter for paired transitions

10 % to 90 %

−9

tEOPR1

EOP width at receiver

must reject as

EOP; see

Figure 23

[1] 40

--ns

tEOPR2

EOP width at receiver

must accept as

EOP; see

Figure 23

[1] 82

--ns

Fig 23. Differential data-to-EOP transition skew and EOP width

002aab561

TPERIOD

differential

data lines

crossover point

source EOP width: tFEOPT

receiver EOP width: tEOPR1, tEOPR2

crossover point

extended

differential data to

SE0/EOP skew

× TPERIOD + tFDEOP

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