參數(shù)資料
型號(hào): CY2277APVC-3
廠商: CYPRESS SEMICONDUCTOR CORP
元件分類: XO, clock
英文描述: LJT 37C 37#16 SKT RECP
中文描述: 66.67 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48
封裝: SSOP-48
文件頁(yè)數(shù): 11/19頁(yè)
文件大小: 206K
代理商: CY2277APVC-3
CY2277A
Document #: 38-07332 Rev. *A
Page 11 of 19
Switching Characteristics (-12)
[9, 10, 11]
Parameter
Output
t
1
All Clocks
t
2
CPUCLK,
IOAPIC
Description
Test Conditions
Min.
45
1.0
1.0
Typ.
50
Max.
55
4.0
4.0
Unit
%
V/ns
Output Duty Cycle
[12]
CPU and IOAPIC Clock
Rising and Falling Edge
Rate
PCI Clock Rising and
Falling Edge Rate
REF0 Clock Rising and
Falling Edge Rate
SDRAM Rising and Fall-
ing Edge Rate
REF1, USB and IO Rising
and Falling Edge Rate
t
1
= t
1A
÷
t
1B
Between 0.6V and 1.8V, V
DDCPU
= 2.5V
Between 0.4V and 2.4V, V
DDCPU
= 3.3V
CPU clocks at 66.6 MHz
Between 0.4V and 2.4V, V
DDCPU
= 3.3V
t
2
PCI
1.0
4.0
V/ns
t
2
REF0
Between 0.8V and 2.4V, V
DDCPU
= 3.3V
1.0
4.0
V/ns
t
2
SDRAM
Between 0.5V and 2.0V
SDRAM clocks at 66.6 MHz
Between 0.4V and 2.4V
1.5
4.0
V/ns
t
2
REF1
USBCLK
IOCLK
CPUCLK
0.5
2.0
V/ns
t
3
CPU Clock Rise Time
Between 0.4V and 2.0V, V
DDCPU
= 2.5V
Between 0.4V and 2.4V, V
DDCPU
= 3.3V
Between 0.4V and 2.4V
0.4
0.4
1.0
2.0
2.0
4.0
ns
t
3
USBCLK,
IOCLK
CPUCLK
USB Clock and I/O Clock
Rise Time
CPU Clock Fall Time
ns
t
4
Between 2.0V and 0.4V, V
DDCPU
= 2.5V
Between 2.4V and 0.4V, V
DDCPU
= 3.3V
Between 2.4V and 0.4V
0.4
0.4
1.0
2.0
2.0
4.0
ns
t
4
USBCLK,
IOCLK
CPUCLK
CPUCLK,
PCICLK
CPUCLK,
SDRAM
CPUCLK
USB Clock and I/O Clock
Fall Time
CPU-CPU Clock Skew
CPU-PCI Clock Skew
(-12)
CPU-SDRAM Clock
Skew
Cycle-Cycle Clock Jitter
ns
t
5
t
6
Measured at 1.25V, V
DDCPU
= 2.5V
Measured at 1.25V for 2.5V clocks, and
at 1.5V for 3.3V clocks
Measured at 1.25V for 2.5V clocks, and
at 1.5V for 3.3V clocks, V
DDCPU
= 2.5V
Measured at 1.25V for 2.5V clocks and
at 1.5V for 3.3V clocks
Measured at 1.5V
CPU, PCI, and SDRAM clock stabiliza-
tion from power-up
100
250
4.0
ps
ns
1.0
t
7
500
ps
t
8
250
ps
t
8
t
9
PCICLK
CPUCLK,
PCICLK,
SDRAM
CPU, PCI,
SDRAM
Cycle-Cycle Clock Jitter
Power-up Time
500
3
ps
ms
t
10
Frequency Slew Rate
Rate of change of frequency
2
MHz/
ms
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