W137 Datasheet, PDF (8/10 Pages) Cypress Semiconductor – Bx Notebook System Frequency Synthesizer

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)
f_D
Deviation from 48 MHz
(48.008 – 48)/48
m/n
PLL Ratio
(14.31818 MHz x 57/17 = 48.008 MHz)
t_R
Output Rise Edge Rate Measured from 0.4V to 2.4V
t_F
Output Fall Edge Rate
Measured from 2.4V to 0.4V
t_D
Duty Cycle
Measured on rising and falling edge at 1.5V
f_ST
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.
Z_o
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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