CY24239 Cypress Semiconductor, CY24239 Datasheet - Page 11

• Manufacturer Part Number: CY24239
• Description: Spread Spectrum Frequency Timing Generator
• Manufacturer: Cypress Semiconductor

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PCI Clock Outputs, PCI0:5 (Lump Capacitance Test Load = 30 pF)
IOAPIC0 and IOAPIC_F Clock Outputs (Lump Capacitance Test Load = 20 pF)
REF0:1 Clock Outputs (Lump Capacitance Test Load = 20 pF)
Document #: 38-07038 Rev. **
Parameter
t
t
t
t
t
t
t
t
t
f
Z
f
t
t
t
f
Z
f
t
t
t
f
Z
Parameter
Parameter
P
H
L
R
F
D
JC
SK
O
ST
R
F
D
ST
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
CPU to PCI Clock 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
Output Rise Edge Rate
Output Fall Edge Rate
Duty Cycle
Frequency Stabilization from
Power-up (cold start)
AC Output Impedance
Description
Description
Description
Duration of clock cycle above 2.4V
Duration of clock cycle below 0.4V
Measured from 0.4V to 2.4V
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.
edge at 1.5V. CPU leads PCI output.
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.
Measured on rising edge at 1.5V
Measured from 2.4V to 0.4V
Measured on rising edge at 1.5V
Covers all CPU/PCI outputs. Measured on rising
Frequency generated by crystal oscillator
Measured from 0.4V to 2.0V
Measured from 2.0V to 0.4V
Measured on rising and falling edge at 1.25V
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.
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
45
45
Min.
1
1
1.5
30
12
12
45
1
1
14.318
14.318
Typ.
Typ.
Typ.
15
25
15
CY24239
Max.
Max.
Max.
250
500
Page 11 of 15
1.5
55
55
55
4
4
4
3
4
4
2
2
3
Unit
MHz
V/ns
V/ns
Unit
MHz
V/ns
V/ns
V/ns
V/ns
Unit
ms
ms
ms
ns
ns
ns
ps
ps
ns
%
%
%