CY2277APAC-12M
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CY2277APAC-12M

Product Category: IC Chips
Manufacturer: CY
Description:
  datasheetCY2277APAC-12M Datasheet
Package: TSSOP48
Quantity: 154 PCS
Lead Free Status / RoHS Status: Lead free / RoHS Compliant
Moisture Sensitivity Level(MSL): 3(168 Hours)
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Manufacturer: CY
Product Category: IC Chips
Features, Applications

Pentium/II, 6x86, K6 Clock Synthesizer/Driver for Desktop/ Mobile PCs with Intel 82430TX and 2 DIMMs or 3 SO-DIMMs

Features

Mixed 2.5V and 3.3V operation Complete clock solution to meet requirements of Pentium, Pentium II, or K6 motherboards Four CPU clocks Up to eight 3.3V SDRAM clocks Seven 3.3V synchronous PCI clocks, one free running Two 3.3V USB/IO clocks or 24 MHz, selectable by serial interface One 2.5V IOAPIC clock at 14.318 MHz Two 3.3V Ref. clocks at 14.318 MHz Factory-EPROM programmable CPU, PCI, and USB/IO clock frequencies for custom configuration Factory-EPROM programmable output drive and slew rate for EMI customization MODE Enable pin for CPU_STOP and PCI_STOP SMBus serial configuration interface Available in space-saving 48-pin SSOP and TSSOP packages. The CY2277A has power-down, CPU stop and PCI stop pins for power management control. The CPU stop and PCI stop are controlled by the MODE pin. They are multiplexed with SDRAM clock outputs, and are selected when the MODE pin is driven LOW. Additionally, these inputs are synchronized on-chip, enabling glitch-free transitions. When the CPU_STOP input is asserted, the CPU outputs are driven LOW. When the PCI_STOP input is asserted, the PCI outputs (except the free-running PCI clock) are driven LOW. Finally, when the PWR_DWN pin is asserted, the reference oscillator and PLLs are shut down, and all outputs are driven LOW. The CY2277A outputs are designed for low EMI emission. 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 (60, 66.6 MHz) CPU (33.3, 66.6 MHz) CPU (SMBus selectable) PCI (CPU/2) SDRAM USB/IO or 24 MHz) IOAPIC (14.318 MHz) Ref (14.318 MHz) CPU-PCI delay


The is a Clock Synthesizer/Driver for Pentium, Pentium II, 6X86, and K6 portable PCs designed with the IntelR 82430TX or similar chipsets. There are three available options as shown in the selector guide The CY2277A outputs four CPU clocks or 3.3V with up to nine selectable frequencies. There are up to eight 3.3V SDRAM clocks and seven PCI clocks, running at one half the CPU clock frequency. One of the PCI clocks is free-running. Additionally, the part outputs two 3.3V USB/IO clocks at 48 MHz or 24 MHz, one 2.5V IOAPIC clock at 14.318 MHz, and two 3.3V reference clocks at 14.318 MHz. The CPU, PCI, USB, and IO clock frequencies are factory-EPROM programmable for easy customization with fast turnaround times.


REF1 REF0 VSS XTALIN CPUCLK[0-3] XTALOUT MODE VDDQ3 VDDCPU PCICLK_F PCICLK0 SDRAM[0-5] VSS VDDQ3 PCICLK5 VSS SEL PCI[0-5] SDATA SCLK PCICLK_F VDDQ3 USBCLK/IOCLK[0:1] USBCLK/IOCLK VSS AVDD PWR_SEL VDDQ2 IOAPIC PWR_DWN VSS CPUCLK0 CPUCLK1 VDDCPU CPUCLK2 CPUCLK3 VSS SDRAM2 SDRAM3 VSS SDRAM6/CPU_STOP SDRAM7/PCI_STOP AVDD


SYS PLL /2 Delay STOP LOGIC SERIAL INTERFACE CONTROL LOGIC Divide and Mux Logic

Name VDDQ3 VDDQ2 VDDCPU AVDD VSS XTALIN[2] XTALOUT[2] MODE SEL SDATA SCLK PWR_DWN PWR_SEL CPUCLK[0:3] PCICLK[0:5] PCICLK_F IOAPIC REF[0:1] USBCLK/IOCLK Pins Description 3.3V Digital voltage supply IOAPIC Digital voltage supply, 2.5V CPU Digital voltage supply, or 3.3V Analog voltage supply Reference crystal input Reference crystal feedback Mode select input, enables power management features Select input to enable 66.66 MHz or 60 MHz CPU clock (See Function tables.) SMBus serial data input for serial configuration port SMBus serial clock input for serial configuration port Active low control input to put osc., PLLs, and outputs in power down state Power select input, indicates whether VDDCPU or 3.3V HIGH 3.3V, LOW=2.5V (internal pull-up to VDD) SDRAM clock output. Also, active LOW control input to stop PCI clocks, enabled when MODE is LOW SDRAM clock output. Also, active LOW control input to stop CPU clocks, enabled when MODE is LOW SDRAM clock outputs, have same frequency as CPU clocks CPU clock outputs PCI clock outputs PCI clock output, free-running IOAPIC clock output Reference clock outputs, 14.318 MHz. REF0 drives 45 pF load USB or IO clock outputs, frequency selected by serial word


Note: 2. For best accuracy, use a parallel-resonant crystal, CLOAD = 18 pF.

Clock Output CPUCLK, SDRAM CPUCLK, SDRAM USBCLK[4] IOCLK Target Frequency (MHz) Actual Frequency (MHz) PPM


Matched impedances on both rising and falling edges on the output drivers Output impedance: 25 (typical) measured at 1.5V


Notes: 3. On power-up, the default frequency on these outputs is 48 MHz. 4. Meets Intel USB clock requirements.

Search Part number : "CY227" Included word is 15
Part Number Manufacturer Package Quantity Description
CY2278APAC-4L CYPRESS TSSOP48 9731
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
CY2277APAC-12M RELATED PRODUCT PICTURE
left
  • CY2278APAC-4L
  • 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
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