CY2278APAC-4L
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CY2278APAC-4L

Product Category: IC Chips
Manufacturer: CYPRESS
Description:
  datasheetCY2278APAC-4L Datasheet
Package: TSSOP48
Quantity: 9731 PCS
Lead Free Status / RoHS Status: Lead free / RoHS Compliant
Moisture Sensitivity Level(MSL): 3(168 Hours)
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Manufacturer: CYPRESS
Product Category: IC Chips
Features, Applications

Pentium/II Clock Synthesizer/Driver for Mobile PCs with Intel 82430TX and No SDRAM

Features

Mixed 2.5V and 3.3V operation Complete clock solution to meet requirements of mobile PentiumR and PentiumR II motherboards Seven CPU clock outputs (three at 3.3V, and four or 3.3V) with eight selectable clock frequencies. Ten 3.3V synchronous PCI clock outputs Two 3.3V USB/IR clocks at 48 MHz One Keyboard clock at 8 MHz One 2.5V IOAPIC clock at 14.318 MHz Two 3.3V Ref. clocks at 14.318 MHz Dedicated power management for portable systems Separate output enable pins for CPU, PCI, and USB/IR clock sets Free-running PCI and CPU clocks (see options) Factory-EPROM programmable output drive and slew rate for EMI customization Custom configuration with factory-EPROM programmable CPU, PCI, and USB/IR frequencies. Low skew and low jitter outputs Available in space-saving 48-pin TSSOP package voltage applied on pin 42. There are ten PCI clocks, running at one half the CPU clock frequency. Free-running PCI and CPU clocks are available as options shown in the selector guide. Additionally, the part outputs two 3.3V USB/IR clocks at 48 MHz, one Keyboard clock at 8 MHz, one 2.5V IOAPIC clock at 14.318 MHz, and two 3.3V reference clocks at 14.318 MHz. The CY2278 family contains several features for output flexibility and power control. The CPU, PCI, USB and IR clock frequencies are all factory EPROM-programmable. Three hardware select inputs support eight CPU clock frequencies from 20-75 MHz. Additionally, each of the CPU, PCI, and USB/IR clock sets can be turned on or off with a dedicated enable input pin for power management. The CY2278A outputs are designed for low EMI emissions. Controlled rise and fall times, unique output driver circuits and factory-EPROM programmable output drive and slew-rate enable optimal configurations for EMI control.


Clock Outputs CPU@3.3V CPU@2.5/3.3V PCI (CPU/2 MHz) USB/IR (48 MHz) KB (8 MHz) IOAPIC (14.318 MHz) Ref (14.318 MHz) CPU-PCI delay


The is a Clock Synthesizer/Driver chip for Pentium or Pentium II portable PCs designed with the 82430TX or similar core-logic chipsets. There are four options available as shown in the selector guide. The CY2278A outputs seven CPU clocks, three of which run at 3.3V and four run at either or 3.3V, depending on the


Intel and Pentium are registered trademarks of Intel Corporation.

REF1 REF0 VSS XIN XOUT PCICLK0_F PCICLK1_F VSS VDDQ3 PCICLK6 VSS CLK8MHz VDDQ3 USBCLK IRCLK VDDQ2 IOAPIC PWR_DWN VSS XCPUCLK0 XCPUCLK1 VDDCPU XCPUCLK2 XCPUCLK3_F VSS CPUCLK2 SEL0 VSS SEL1 VSS SEL2 CPU_RUN USB_RUN PCI_RUN AVDD VSS REF1 REF0 VSS XIN XOUT PCICLK0 PCICLK1 VSS VDDQ3 PCICLK6 VSS CLK8MHz VDDQ3 USBCLK IRCLK


VDDQ2 IOAPIC PWR_DWN VSS XCPUCLK0 XCPUCLK1 VDDCPU XCPUCLK2 XCPUCLK3 VSS CPUCLK2 SEL0 VSS SEL1 VSS SEL2 CPU_RUN USB_RUN PCI_RUN AVDD VSS


REF1 REF0 VSS XIN XOUT PCICLK0_F PCICLK1_F VSS VDDQ3 PCICLK6 VSS CLK8MHz VDDQ3 USBCLK IRCLK VDDQ2 IOAPIC PWR_DWN VSS XCPUCLK0 XCPUCLK1 VDDCPU XCPUCLK2 XCPUCLK3 VSS CPUCLK2 SEL0 VSS SEL1 VSS SEL2 CPU_RUN USB_RUN PCI_RUN AVDD VSS REF1 REF0 VSS XIN XOUT PCICLK0_F PCICLK1_F VSS VDDQ3 PCICLK6 VSS CLK8MHz VDDQ3 USBCLK IRCLK


VDDQ2 IOAPIC PWR_DWN VSS XCPUCLK0 XCPUCLK1 VDDCPU XCPUCLK2 XCPUCLK3 VSS CPUCLK2 SEL0 VSS SEL1 VSS SEL2 CPU_RUN USB_RUN PCI_RUN AVDD VSS


Name VDDQ3 VDDQ2 VDDCPU AVDD VSS XTALIN SEL1 SEL0 PCI_RUN USB_RUN CPU_RUN PWR_DWN PCICLK_F[0:1] CLK8MHZ IOAPIC REF[0:1] USBCLK/IRCLK


Description 3.3V Digital voltage supply IOAPIC Digital voltage supply, 2.5V CPU Digital voltage supply, or 3.3V Analog voltage supply, 3.3V Ground Reference crystal input Reference crystal feedback CPU clock frequency select input, bit 2 CPU clock frequency select input, bit 1 CPU clock frequency select input, bit 0 Control input, stops all PCI clocks except PCICLK_F when driven LOW Control input, stops all USB/IR clocks when driven LOW Control input, stops all CPU clocks except XCPUCLK_F when driven LOW Power down input, shuts down device when driven LOW or 3.3V CPU clock outputs or 3.3V CPU clock output, free-running on CY2278A-1L only. This output is not free-running on the -3L, -4L configurations. 3.3V CPU clock output PCI clock outputs, free-running -3L, -4L only. This output is not free-running on the -2L configuration 8-MHz Keyboard clock output IOAPIC clock output Reference clock outputs, 14.318 MHz. REF0 has high drive USB or IR clock outputs, 48 MHz


Note: 3. For best accuracy, use a parallel-resonant crystal, CLOAD = 18 pF.

Search Part number : "CY227" Included word is 15
Part Number Manufacturer Package Quantity Description
CY2273APVC-1 CY SSOP48 3262
CY22797FC CYPRESS TSOP 78
CY2273APVC-1(CS4968AM) Cypress SSOP-48 5560
CY227GAPVC-21T O-NEW SOP 1310
CY2275APVC-12 CYPRESS SSOP-48 3485
CY2276APVC-12 CY SSOP56 118
CY2276APVC-21T CY SOT-220 42485
CY2277APAC-1 CY TQFP100 465
CY2277APAC-1M CYPRESS TSSOP48 3413
CY2277APAC-7M CY TSSOP48 154
CY2277APVC-1 CY SOP 162
CY2277APVC-3T CYPRESS SOP 3416
CY2277APVC-6 CY SOP48 895
CY2277APVXC-1T SPECTRALINEA SSOP48 3060
CY2277VPVC-3 CY SOP48 435
CY2278APAC-4L RELATED PRODUCT PICTURE
left
  • CY2273APVC-1
  • CY22797FC
  • CY2273APVC-1(CS4968AM)
  • CY227GAPVC-21T
  • CY2275APVC-12
  • CY2276APVC-12
  • CY2276APVC-21T
  • CY2277APAC-1
  • CY2277APAC-1M
  • CY2277APAC-7M
  • CY2277APVC-1
  • CY2277APVC-3T
  • CY2277APVC-6
  • CY2277APVXC-1T
  • CY2277VPVC-3
right
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