CY2277A
Switching Characteristics (-1M, -7M, -12M)[9, 10, 11]
Parameter
Output
Description
Output Duty Cycle[12]
Test Conditions
t1 = t1A y t1B
Min. Typ. Max.
Unit
t1
CPUCLK
SDRAM
USBCLK
REF [0,1]
IOAPIC
45
50
55
%
t1
t2
PCI
Output Duty Cycle[12]
t1 = t1A y t1B
45
50
55
%
CPUCLK, CPU and IOAPIC Clock
Between 0.4V and 2.0V, VDDCPU = 2.5V 0.60
4.0
V/ns
IOAPIC
PCI
Rising and Falling Edge CPU clocks at 66.66 MHz
Rate
t2
t2
t2
t2
PCI Clock Rising and
Falling Edge Rate
Between 0.4V and 2.0V, VDDCPU = 2.5V 0.65
4.0
4.0
4.0
2.0
V/ns
V/ns
V/ns
V/ns
USBCLK, USB, REF0 Clock Rising Between 0.4V and 2.4V
and Falling Edge Rate
0.65
0.70
0.5
REF0
SDRAM
SDRAM Rising and
Falling Edge Rate
Between 0.4V and 2.4V
SDRAM clocks at 66.66 MHz
REF1
REF1 Rising and Falling Between 0.4V and 2.4V
Edge Rate
t3
t3
t4
t4
t5
t5
t5
CPUCLK
USBCLK
CPUCLK
USBCLK
CPUCLK
PCICLK
SDRAM
CPU Clock Rise Time
USB Clock Rise Time
CPU Clock Fall Time
USB Clock Fall Time
CPU-CPU Clock Skew
PCI-PCI Clock Skew
Between 0.4V and 2.0V, VDDCPU = 2.5V 0.4
Between 0.4V and 2.0V
2.4
2.5
ns
ns
ns
ns
ps
ps
ps
Between 2.0V and 0.4V, VDDCPU = 2.5V 0.4
Between 2.0V and 0.4V
2.4
2.5
Measured at 1.25V, VDDCPU = 2.5V
Measured at 1.5V
100
2.0
250
400
300
SDRAM-SDRAM Clock
Skew
Measured at 1.5V
t6
t6
t7
CPUCLK, CPU-PCI Clock Skew
PCICLK -1M, -12M
Measured at 1.25V for 2.5V clocks, and
at 1.5V for 3.3V clocks
1.0
6.0
750
600
ns
ps
ps
CPUCLK, CPU-PCI Clock Skew
PCICLK -7M
Measured at 1.25V for 2.5V clocks, and
at 1.5V for 3.3V clocks
CPUCLK, CPU-SDRAM Clock
Measured at 1.25V for 2.5V clocks, and
at 1.5V for 3.3V clocks, VDDCPU = 2.5V
SDRAM
CPUCLK
SDRAM
PCICLK
Skew
t8
t8
t8
t8
Cycle-Cycle Clock Jitter Measured at 1.25V for 2.5V clocks
Cycle-Cycle Clock Jitter Measured at 1.5V
525
600
400
900
ps
ps
ps
ps
Cycle-Cycle Clock Jitter Measured at 1.5V
USBCLK, Cycle-Cycle Clock Jitter Measured at 1.5V
IOCLK
t9
CPUCLK, Power-up Time
PCICLK,
SDRAM
CPU, PCI, and SDRAM clock stabili-
zation from power-up
3
ms
t10
CPU, PCI, Frequency Slew Rate
SDRAM
Rate of change of frequency
2
MHz/
ms
Rev 1.0,November 25, 2006
Page 10 of 18
SPECTRALINEAR [ SPECTRALINEAR INC ]
