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| CY2254A Datasheet, PDF (4/7 Pages) Cypress Semiconductor – Pentium Processor Compatible Clock Synthesizer/Driver | |||
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CY2254A
Electrical Characteristics VDD = 3.135V 3.6V, or 5.0V r10%, TA = 0qC to +70qC (continued)
Parameter
Description
Test Conditions
Note:
3. Electrical parameters are guaranteed with these operating conditions.
4. Guaranteed by design, not tested.
Min. Max. Unit
Switching Characteristics[5]
Parameter
Output
t1
All
t2[4]
CPUCLK, PCICLK
t3[4]
REF, KBDCLK, USBCLK
t4[4]
REF, KBDCLK, USBCLK
t5[4]
CPUCLK
t6[4]
PCICLK
t7[4]
CPUCLK, PCICLK
t8[4]
CPUCLK
Switching Waveforms
Duty Cycle Timing
Name
Output Duty Cycle[6]
Output Rising and
Falling Edge Rate
Description
t1 = t1A y t1B
Measured between 0.4 and 2.4V
Rise Time
Measured between 0.4 and 2.4V
Fall Time
Measured between 2.4 and 0.4V
CPU-CPU Clock Skew Measured at 1.5V
PCI-PCI Clock Skew Measured at 1.5V
CPU-PCI Skew
Measured at 1.5V (1 option)
Measured at 1.5V (2 option)
Cycle-Cycle Clock Jitter CPU Clock Jitter
Min. Max. Unit
45% 55%
1
V/ns
4 ns
4 ns
250 ps
250 ps
1
4 ns
500 ps
200 ps
1.5V
t1B
t1A
1.5V
1.5V
All Outputs Rise/Fall Time
OUTPUT
2.4V
0.4V
t2
t3
2.4V
0.4V
t2
t4
3.3V
0V
Rev 1.0, November 25, 2006
Page 4 of 7
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