CY2254A
Electrical Characteristics
V
DD
= 3.135V
−
3.6V, or 5.0V
±10%,
T
A
= 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
t
1
t
2[4]
t
3[4]
t
4[4]
t
5[4]
t
6[4]
t
7[4]
t
8[4]
All
CPUCLK, PCICLK
REF, KBDCLK, USBCLK
REF, KBDCLK, USBCLK
CPUCLK
PCICLK
CPUCLK, PCICLK
Output
Name
Output Duty Cycle
[6]
Output Rising and Fall-
ing Edge Rate
Rise Time
Fall Time
CPU-CPU Clock Skew
PCI-PCI Clock Skew
CPU-PCI Skew
Description
t
1
= t
1A
÷
t
1B
Measured between 0.4 and 2.4V
Measured between 0.4 and 2.4V
Measured between 2.4 and 0.4V
Measured at 1.5V
Measured at 1.5V
Measured at 1.5V (−1 option)
Measured at 1.5V (−2 option)
CPUCLK
Cycle-Cycle Clock Jitter CPU Clock Jitter
1
Min.
45%
1
4
4
250
250
4
500
200
Max.
55%
V/ns
ns
ns
ps
ps
ns
ps
ps
Unit
Switching Waveforms
Duty Cycle Timing
t
1B
t
1A
1.5V
1.5V
1.5V
All Outputs Rise/Fall Time
2.4V
0.4V
t
2
t
3
2.4V
0.4V
t
2
t
4
3.3V
0V
OUTPUT
Document #: 38-07203 Rev. *A
Page 4 of 8
CYPRESS [ CYPRESS SEMICONDUCTOR ]
