參數(shù)資料
型號(hào)： CY28346OCT
廠商： CYPRESS SEMICONDUCTOR CORP
元件分類： XO, clock
英文描述： CONN BNC PLUG CRIMP RG-59,62
中文描述： 200 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO56
封裝： SSOP-56
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 179K
代理商： CY28346OCT
CY28346
Document #: 38-07331 Rev. *B
Page 9 of 20
Special Functions
PCI_F and IOAPIC Clock Outputs
The PCIF clock outputs are intended to be used, if required,
for systems IOAPIC clock functionality. Any two of the PCI_F
clock outputs can be used as IOAPIC 33 Mhz clock outputs.
They are 3.3V outputs will be divided down via a simple
resistive voltage divider to meet specific system IOAPIC clock
voltage requirements. In the event that these clocks are not
required, they can be used as general PCI clocks or disabled
via the assertion of the PCI_STP# pin.
3V66_1/VCH Clock Output
The 3V66_1/VCH pin has a dual functionality that is selectable
via SMBus.
Configured as DRCG (66M), SMBus Byte0, Bit 5 =
“
0
”
The default condition for this pin is to power-up in a 66M
operation. In 66M operation this output is SSCG-capable and
when spreading is turned on, this clock will be modulated.
Configured as VCH (48M), SMBus Byte0, Bit 5 =
“
1
”
In this mode, output is configured as a 48-Mhz non-spread
spectrum output that is phase-aligned with other 48M outputs
(USB and DOT) to within 1 ns pin-to-pin skew. The switching
of 3V66_1/VCH into VCH mode occurs at system power-on.
When the SMBus Bit 5 of Byte 0 is programmed from a
“
0
”
to
a
“
1,
”
the 3V66_1/VCH output may glitch while transitioning to
48M output mode.
CPU_STP# Clarification
The CPU_STP# signal is an active LOW input used to
synchronously stop and start the CPU output clocks while the
rest of the clock generator continues to function.
CPU_STP#
–
Assertion
When CPU_STP# pin is asserted, all CPUT/C outputs that are
set with the SMBus configuration to be stoppable via assertion
of CPU_STP# will be stopped after being sampled by two
falling CPUT/C clock edges. The final state of the stopped
CPU signals is CPUT = HIGH and CPU0C = LOW. There is no
change to the output drive current values during the stopped
state. The CPUT is driven HIGH with a current value equal to
(Mult 0
“
select
”
)
×
(Iref), and the CPUC signal will not be
driven. Due to external pull-down circuitry CPUC will be LOW
during this stopped state.
CPU_STP# Deassertion
The deassertion of the CPU_STP# signal will cause all
CPUT/C outputs that were stopped to resume normal
operation in a synchronous manner (meaning that no short or
stretched clock pulses will be produces when the clock
resumes). The maximum latency from the deassertion to
active outputs is no more than two CPUC clock cycles.
Three-state Control of CPU Clocks Clarification
During CPU_STP# and PD# modes, CPU clock outputs may
be set to driven or undriven (tri-state) by setting the corre-
sponding SMBus entry in Bit6 of Byte0 and Bit6 of Byte1.
PCI(0:6)
PCI_F(0:2)
Tpci
3V66(0:5)
Figure 8. Unbuffered Mode
–
3V66(0:5) to PCI (0:6) and PCI_F(0:2) Phase Relationship
CPU_STP#
CPUT
CPUC
CPUT
CPUC
Figure 9. CPU_STP# Assertion Waveform
相關(guān)PDF資料
PDF描述
CY28346ZC Clock Synthesizer with Differential CPU Outputs
CY28346ZCT Clock Synthesizer with Differential CPU Outputs
CY28347 HDC-HA-48-SVL1/29 RoHS Compliant: Yes
CY28347ZC Universal Single-chip Clock Solution for VIA P4M266/KM266 DDR Systems
CY28347ZCT Universal Single-chip Clock Solution for VIA P4M266/KM266 DDR Systems
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
CY28346OXC 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 NB clk for Intel 830M & 845 chipsets RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
CY28346OXCT 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 NB clk for Intel 830M & 845 chipsets RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
CY28346ZC 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 NB clk for Intel 830M & 845 chipsets RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
CY28346ZC-2 制造商:Rochester Electronics LLC 功能描述:FTG FOR INTEL 830M AND 845 CHIPSETS (CK-408) - Bulk
CY28346ZC-2T 制造商:CYPRESS 制造商全稱:Cypress Semiconductor 功能描述:Clock Synthesizer with Differential CPU Outputs
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*