TUSB1310

SLLSE16C – DECEMBER 2009 – REVISED AUGUST 2010

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5.2.2

Oscillator

If an external clock source is used, XI should be tied to the clock source and XO should be left floating.

Table 5-1. Oscillator Specification

PARAMETER

CONDITION

MIN

TYP

MAX

UNIT

Frequency tolerance

Operational temperature

±50

ppm

Frequency stability

1 year aging

±50

ppm

Rise / Fall time

20% - 80%

6

ns

(1) (2)

0.8

ps

(2) (3)

25

ps

50

ps

(1)

Sigma value assuming Gaussian distribution

(2)

After application of JTF

(3)

(4)

Absolute phase jitter (p-p)

5.2.3

Crystal

Either a 20-MHz, 25-MHz, 30-MHz, or 40-MHz crystal can be selected. A parallel, 20-pF load crystal

should be used if a crystal source is used.

Table 5-2. Oscillator Specification

PARAMETER

CONDITION

MIN

TYP

MAX

UNIT

Frequency tolerance

Operational temperature

±50

ppm

Frequency stability

1 year aging

±50

ppm

Load capacitance

12

20

24

pF

28

DESIGN GUIDELINES

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