W230H Cypress Semiconductor Corp., W230H Datasheet - Page 10

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

DC Electrical Characteristics:
AC Electrical Characteristics
T
AC clock parameters are tested and guaranteed over stated operating conditions using the stated lump capacitive load at the
clock output; Spread Spectrum is disabled.
CPU Clock Outputs (CPUT0, CPUC0, CPUT_CS)
Notes:
Document #: 38-07224 Rev. *A
5.
6.
7.
8.
Crystal Oscillator
V
C
C
Pin Capacitance/Inductance
C
C
L
Parameter
t
t
t
t
f
Z
A
R
F
D
JC
ST
Parameter
IN
o
TH
LOAD
IN,X1
IN
OUT
= 0°C to +70°C, V
X1 input threshold voltage (typical) is V
The W230 contains an internal crystal load capacitor between pin X1 and ground and another between pin X2 and ground. Total load placed on crystal is 14 pF;
this includes typical stray capacitance of short PCB traces to crystal.
X1 input capacitance is applicable when driving X1 with an external clock source (X2 is left unconnected).
Refer to Figure 5 for K7 operation clock driver test circuit.
Output Rise Edge Rate
Output Fall Edge Rate
Duty Cycle
Jitter, Cycle to Cycle
Frequency Stabilization
from Power-up (cold
start)
AC Output Impedance
X1 Input Threshold Voltage
Load Capacitance, Imposed on
External Crystal
X1 Input Capacitance
Input Pin Capacitance
Output Pin Capacitance
Input Pin Inductance
Description
DDQ3
= 3.3V±5%, f
Description
[6]
DD
/2.
[7]
T
Measured at 50% point
Assumes full supply voltage reached
within 1 ms from power-up. Short
cycles exist prior to frequency
stabilization.
V
XTL
A
O
= 0°C to +70°C, V
[5]
= V
Test Condition/Comments
= 14.31818 MHz
X
[8]
Except X1 and X2
V
Pin X2 unconnected
DDQ3
DDQ3
Test Condition
= 3.3V
= 3.3V±5% (continued)
Min. Typ. Max.
CPU = 100 MHz
250
1.0
1.0
50
50
Min.
3
Typ.
1.65
14
28
Min.
CPU = 133 MHz
Typ. Max.
250
1.0
1.0
Max.
50
50
3
5
6
7
Page 10 of 15
W230
Unit
nH
pF
pF
pF
pF
V
V/ns
V/ns
Unit
ms
ps
%