LPC47M14X datasheet(179/205 Pages) SMSC

179 / 205 page

SMSC DS – LPC47M14X

Page 179

Rev. 03/19/2001

PARAMETER

SYM

CONDITIONS

(NOTES 1, 2, 3)

MIN

MAX

UNIT

Differential Rise/Fall Time

Matching

TRFM

(TR/TF)

Note 9

111.11

Drive Output Impedance

ZDRV

Steady State Drive

Ω

DRIVER CHARACTERISTICS (Low-Speed)

Transition Time:

Rise Time

Fall Time

Note 4,5 and FIGURE 10

FIGURE 12

300

Differential Rise/Fall Time

Matching

TRFM

(TR/TF)

Note 9

125

DATA TRANSFER TIMINGS

Full Speed Data Rate

TDRATE

Notes 8, 10, & 12

11.9700

12.0300

Mbs

Frame Interval

TFRAME

Note 8

0.9995

1.0005

Clock Period

TPERIOD

Note 10

Source

Jitter

Total

(including

frequency

tolerance):

To next Transition

For Paired Transitions

TDJ1

TDJ2

Note 6, 7, & 9

FIGURE 14

-3.5

-4.0

3.5

4.0

Source

Jitter

for

Differential Transition to

SEO Transition

TDEOP

Note 7 and FIGURE 15

-2

Receiver Jitter:

To next Transition

For Paired Transitions

TJR1

TJR2

Note 7 and FIGURE 16

-18.5

-9

18.5

9.0

Source SEO interval of

EOP

TEOPT

Note 7 and FIGURE 15

160

175

Receiver SEO interval of

EOP

TEOPR

Note 7 and FIGURE 15

Width of SEO interval

during

differential

transition

TFST

Note 11

Note 1: All voltages are measured from the local ground potential, unless otherwise specified.

Note 2: All timing use a capacitive load (CL) to ground of 50pF, unless otherwise specified.

Note 3: Full speed timings have a 1.5K

Ω pull-up to a voltage of 3.0V - 3.6V on the D+ data line.

Note 4: Measured from 10% to 90% of the data signals.

Note 5: The rising and falling edges should be smoothly transitioning (monotonic).

Note 6: Timing differences between the differential data signals.

Note 7: Measured at crossover point of differential data signals.

Note 8: For a more detailed description of the Data Signaling Rate and the Frame Interval see sections 7.1.11 and

7.1.12 in the USB Spec 1.1.

Note 9: Excluding the first transition from the idle state.

Note 10: The accuracy of the host controller’s data rate must be known and controlled to better than

±0.05%

Note 11: During differential signal transitions both PD+ and PD- may temporarily be less that

VIH(min). This period can be up to 14ns.

Note 12: The data-rate tolerance for host, hub, and full-speed functions is

±0.25%

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