CY2254A
Electrical Characteristics VDD = 3.135V − 3.6V, or 5.0V ±10%, TA = 0°C to +70°C (continued)
Parameter
Description
Test Conditions
Min. Max. Unit
Notes:
3. Electrical parameters are guaranteed with these operating conditions.
4. Guaranteed by design, not tested.
Switching Characteristics[5]
Parameter
Output
Name
Description
t1 = t1A ÷ t1B
Min. Max. Unit
t1
All
Output Duty Cycle[6]
45% 55%
[4]
t2
CPUCLK, PCICLK
Output Rising and Fall- Measured between 0.4 and 2.4V
ing Edge Rate
1
V/ns
[4]
t3
REF, KBDCLK, USBCLK
REF, KBDCLK, USBCLK
CPUCLK
Rise Time
Fall Time
Measured between 0.4 and 2.4V
Measured between 2.4 and 0.4V
4
ns
ns
ps
ps
ns
ps
ps
[4]
t4
4
[4]
t5
CPU-CPU Clock Skew Measured at 1.5V
250
250
4
[4]
t6
PCICLK
PCI-PCI Clock Skew
CPU-PCI Skew
Measured at 1.5V
[4]
t7
CPUCLK, PCICLK
Measured at 1.5V (−1 option)
Measured at 1.5V (−2 option)
1
500
200
[4]
t8
CPUCLK
Cycle-Cycle Clock Jitter CPU Clock Jitter
Switching Waveforms
Duty Cycle Timing
t
1B
t
1A
1.5V
1.5V
1.5V
All Outputs Rise/Fall Time
3.3V
0V
2.4V
2.4V
0.4V
OUTPUT
0.4V
t
2
t
3
t
2
t
4
Document #: 38-07203 Rev. *A
Page 4 of 8
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