W230H Cypress Semiconductor Corp., W230H Datasheet - Page 11

• Manufacturer Part Number: W230H
• Description: Frequency Timing Generators For PC And Server Motherboards
• Manufacturer: Cypress Semiconductor Corp.

PCI Clock Outputs, PCI0:5 (Lump Capacitance Test Load = 30 pF
REF0:1 Clock Outputs (Lump Capacitance Test Load = 20 pF)
48-MHz Clock Output (Lump Capacitance Test Load = 20 pF)
Document #: 38-07224 Rev. *A
Parameter
t
t
t
t
t
t
t
t
f
Z
f
t
t
t
f
Z
f
f
m/n
t
t
t
f
Z
Parameter
Parameter
P
H
L
R
F
D
JC
SK
ST
R
F
D
ST
D
R
F
D
ST
o
o
o
Period
High Time
Low Time
Output Rise Edge Rate
Output Fall Edge Rate
Duty Cycle
Jitter, Cycle-to-Cycle
Output Skew
Frequency Stabilization
from Power-up (cold
start)
AC Output Impedance
Frequency, Actual
Output Rise Edge Rate
Output Fall Edge Rate
Duty Cycle
Frequency Stabilization from
Power-up (cold start)
AC Output Impedance
Frequency, Actual
Deviation from 48 MHz
PLL Ratio
Output Rise Edge Rate
Output Fall Edge Rate
Duty Cycle
Frequency Stabilization
from Power-up (cold start)
AC Output Impedance
Description
Description
Description
Measured on rising edge at 1.5V
Duration of clock cycle above 2.4V
Duration of clock cycle below 0.4V
Measured from 0.4V to 2.4V
Measured from 2.4V to 0.4V
Measured on rising and falling edge at 1.5V
Measured on rising edge at 1.5V. Maximum
difference of cycle time between two adjacent cycles.
Measured on rising 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.
Determined by PLL divider ratio (see m/n below)
(48.008 – 48)/48
(14.31818 MHz x 57/17 = 48.008 MHz)
Measured from 0.4V to 2.4V
Measured from 2.4V to 0.4V
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 fre-
quency stabilization.
Average value during switching transition. Used
for determining series termination value.
Frequency generated by crystal oscillator
Measured from 0.4V to 2.4V
Measured from 2.4V to 0.4V
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.
Test Condition/Comments
Test Condition/Comments
Test Condition/Comments
Min.
Min.
0.5
0.5
0.5
0.5
45
45
Min.
30
12
12
45
1
1
14.318
48.008
57/17
+167
Typ.
Typ.
Typ.
40
40
30
Max.
Max.
Max.
250
500
Page 11 of 15
55
55
55
4
4
3
2
2
3
2
2
3
W230
MHz
V/ns
V/ns
Unit
MHz
V/ns
V/ns
Unit
ppm
V/ns
V/ns
Unit
ms
ms
ms
%
ns
ns
ns
ps
ps
%
%