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W137

Bx Notebook System Frequency Synthesizer

Cypress Semiconductor 

W137

48-MHz and 24-MHz Clock Outputs (Lump Capacitance Test Load = 20 pF)

Parameter

Description

f

Frequency, Actual

Test Condition/Comments

Determined by PLL divider ratio (see n/m below)

fD

Deviation from 48 MHz

(48.008 – 48)/48

m/n

PLL Ratio

(14.31818 MHz x 57/17 = 48.008 MHz)

tR

Output Rise Edge Rate Measured from 0.4V to 2.4V

tF

Output Fall Edge Rate

Measured from 2.4V to 0.4V

tD

Duty Cycle

Measured on rising and falling edge at 1.5V

fST

Frequency Stabilization Assumes full supply voltage reached within 1 ms

from Power-up (cold start) from power-up. Short cycles exist prior to

frequency stabilization.

Zo

AC Output Impedance

Average value during switching transition. Used

for determining series termination value.

CPU = 66.6/100 MHz

Min. Typ. Max.

48.008

24.004

+167

57/17, 57/34

0.5

2

0.5

2

45

55

3

25

Unit

MHz

ppm

V/ns

V/ns

%

ms

Ω

Ordering Information

Ordering Code

Package

Name

W137

H

X

Package Type

28-pin SSOP (209 mils)

28-pin TSSOP (173 mils)

Intel is a registered trademark of Intel Corporation.

Document #: 38-00821

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