W215B Datasheet, PDF (10/14 Pages) Cypress Semiconductor – Uses external 14.318-MHz crystal

PRELIMINARY
W215B
I/O APIC Clock Output (Test Load: R = 33Ω; C = 22 pF)
Parameter
Description
f
Frequency, Actual
t_R
Output Rise Edge Rate
t_F
Output Fall Edge Rate
t_D
Duty Cycle
f_ST
Frequency Stabilization
from Power-up (cold start)
Z_o
AC Output Impedance
Test Condition/Comments
Frequency generated by crystal oscillator
Measured on rising and falling edge at 1.5V
Assumes full supply voltage reached within
1 ms from power-up. Short cycles exist prior to
frequency stabilization.
Average value during switching transition.
Used for determining series termination value.
CPU = 100 MHz
Min. Typ. Max.
14.31818
1
4
1
4
45
50
55
1.5
15
Unit
MHz
V/ns
V/ns
%
ms
Ω
REF0 Clock Output (Test Load: R = 33Ω; C = 22 pF)
Parameter
Description
Test Condition/Comments
f
Frequency, Actual
Frequency generated by crystal oscillator
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 from Assumes full supply voltage reached within 1 ms
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 = 100 MHz
Min. Typ. Max.
14.318
1
4
1
4
45 50 55
1.5
Unit
MHz
V/ns
V/ns
%
ms
16
Ω
REF1 Clock Output (Lump Capacitance Test Load = 20 pF)
Parameter
Description
Test Condition/Comments
f
Frequency, Actual
Frequency generated by crystal oscillator
t_R
Output Rise Edge Rate
t_F
Output Fall Edge Rate
t_D
Duty Cycle
Measured on rising and falling edge at 1.5V
f_ST
Frequency Stabilization from Assumes full supply voltage reached within 1 ms
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 = 100 MHz
Min. Typ. Max.
14.318
0.5
2
0.5
2
45
55
1.5
Unit
MHz
V/ns
V/ns
%
ms
25
Ω
Document #: 38-07222 Rev. *A*
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