CY28341-2 Universal Clock Chip for VIA™P4M/KT/KM400 DDR Systems Features Table 1. Frequency Selection Table FS(3:0) 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 • Supports VIA P4M/KM/KT/266/333/400 chipsets • Supports Pentium® 4, Athlon™ processors • Supports two DDR DIMMS • Supports three SDRAM DIMMS at 100 MHz • Provides: — two different programmable CPU clock pairs — six differential SDRAM DDR pairs — three low-skew/-jitter AGP clocks — seven low-skew/-jitter PCI clocks — one 48M output for USB — one programmable 24M or 48M for SIO • Dial-a-Frequency and Dial-a-dB features • Spread Spectrum for best electromagnetic interference (EMI) reduction • Watchdog feature for system recovery CPU 66.80 100.00 120.00 133.33 72.00 105.00 160.00 140.00 77.00 110.00 180.00 166.6 90.00 100.00 200.00 133.33 AGP 66.80 66.80 60.00 66.67 72.00 70.00 64.00 70.00 77.00 73.33 60.00 66.6 60.00 66.67 66.67 66.67 PCI 33.40 33.40 30.00 33.33 36.00 35.00 32.00 35.00 38.50 36.67 30.00 33.3 30.00 33.33 33.33 33.33 • SMBus-compatible for programmability • 56-pin SSOP and TSSOP packages Block Diagram Pin Configuration[1] VDDR XIN REF(0:1) XTAL XOUT REF0 FS0 FS2 VDDI SELP4_K7# CPUCS_T/C VDDC CPU(0:1)/CPU0D_T/C PLL1 VDDPCI PCI(3:6) FS3 FS1 PCI1 VDDAGP AGP(0:2) SDATA SCLK SMBus VDD48M 48M PLL2 /2 WDEN 24_48M SRESET# VDDD FBOUT WD SELSDR_DDR Buf_IN S2D 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 VTTPWRGD#/REF1 VDDR VSSC CPUT/CPUOD_T CPUC/CPUOD_C VDDC VDDI CPUCS_C CPUCS_T VSSI FBOUT BUF_IN DDRT0/SDRAM0 DDRC0/SDRAM1 DDRT1/SDRAM2 DDRC1/SDRAM3 VDDD VSSD DDRT2/SDRAM4 DDRC2/SDRAM5 DDRT3/SDRAM6 DDRC3/SDRAM7 VDDD VSSD DDRT4/SDRAM8 DDRC4/SDRAM9 DDRT5/SDRAM10 DDRC5/SDRAM11 56 pin SSOP DDRT(0:5)/SDRAM(0,2,4,6,8,10) DDRC(0:5)/SDRAM(1,3,5,7,9,11) CONVERT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 CY28341-2 PCI_F MULTSEL PCI2 PD# *FS0/REF0 VSSR XIN XOUT VDDAGP AGP0 *SELP4_K7/AGP1 AGP2 VSSAGP **FS1/PCI_F **SELSDR_DDR/PCI1 *MULTSEL/PCI2 VSSPCI PCI3 PCI4 VDDPCI PCI5 PCI6 VSS48M **FS3/48M **FS2/24_48M VDD48M VDD VSS IREF *PD#/SRESET# SCLK SDATA Note: 1. Pins marked with [*] have internal pull-up resistors. Pins marked with [**] have internal pull-down resistors. Cypress Semiconductor Corporation Document #: 38-07471 Rev. *D • 3901 North First Street • San Jose, CA 95134 • 408-943-2600 Revised March 11, 2005 CY28341-2 Pin Description[2] Pin Number Pin Name PWR I/O Pin Description I Oscillator Buffer Input. Connect to a crystal or to an external clock. VDD O Oscillator Buffer Output. Connect to a crystal. Do not connect when an external clock is applied at XIN. 3 XIN 4 XOUT 1 FS0/REF0 VDDR 56 VTTPWRGD# VDDR I If SELP4_K7 = 1, with a P4 processor set up as CPUT/C. At power-up, VTT_PWRGD# is an input. When this input transitions to a logic low, the FS (3:0) and MULTSEL are latched and all output clocks are enabled. After the first high to low transition on VTT_PWRGD#, this pin is ignored and will not effect the behavior of the device thereafter. When the VTT_PWRGD# feature is not used, please connect this signal to ground through a 10KΩ resistor. REF1 VDDR O If SELP4_K7 = 0, with an Athlon (K7) processor as CPU_OD(T:C). VTT_PWRGD# function is disabled, and the feature is ignored. This pin becomes REF1 and is a buffered copy of the signal applied at XIN. 44,42,38, 36,32,30 DDRT (0:5)/SDRAM (0,2,4,6,8,10) VDDD O These pins are programmable through strapping pin11, SELSDR_DDR#. If SELSDR_DDR#.= 0, these pins are configured for DDR clock outputs. They are “True” copies of signal applied at Pin45, BUF_IN. In this mode, VDDD must be 2.5VIf SelSDR_DDR#.= 1, these pins are configured for SDRAM(0,2,4,6,8,10) single ended clock outputs, copies of (and in phase with) signal applied at Pin45, BUF_IN. In this mode, VDDD must be 3.3V 43,41,37 35,31,29 DDRC (0:5)/SDRAM (1,3,5,7,9,11) VDDD O These pins are programmable through strapping pin11, SELSDR_DDR#. If SelSDR_DDR#.= 0, these pins are configured for DDR clock outputs. They are “Complementary” copies of signal applied at Pin45, BUF_IN. In this mode, VDDD must be 2.5VIf SelSDR_DDR#.= 1, these pins are configured for SDRAM(1,3,5,7,9,11) single ended clock outputs, copies of (and in phase with) signal applied at Pin45, BUF_IN. In this mode, VDDD must be 3.3V. 7 SELP4_K7 / AGP1 VDDAGP I/O Power-on Bidirectional Input/Output. At power-up, SELP4_K7 is the input. PU When the power supply voltage crosses the input threshold voltage, SELP4_K7 state is latched and this pin becomes AGP1 clock output. SELP4_K7 = 1, P4 mode. SELP4_K7 = 0, K7 mode. 12 MULTSEL/PCI2 VDDPCI 53 CPUT/CPUOD_T VDDC O 3.3V CPU Clock Outputs. This pin is programmable through strapping pin7, SELP4_K7. If SELP4_K7 = 1, this pin is configured as the CPUT Clock Output. If SELP4_K7 = 0, this pin is configured as the CPUOD_T Open Drain Clock Output. See Table 1 52 CPUC/CPUOD_C VDDC O 3.3V CPU Clock Outputs. This pin is programmable through strapping pin7, SELP4_K7. If SELP4_K7 = 1, this pin is configured as the CPUC Clock Output. If SELP4_K7 = 0, this pin is configured as the CPUOD_C Open Drain Clock Output. See Table 1 48,49 CPUCS_T/C I/O Power-on Bidirectional Input/Output. At power-up, FS0 is the input. When PU the power supply voltage crosses the input threshold voltage, FS0 state is latched and this pin becomes REF0, buffered copy of signal applied at XIN. (1-2 x strength, selectable by SMBus. Default value is 1 x strength.) I/O Power-on Bidirectional Input/Output. At power-up, MULTSEL is the input. PU When the power supply voltage crosses the input threshold voltage, MULTSEL state is latched and this pin becomes PCI2 clock output. MULTSEL = 0, Ioh is 4 x IREFMULTSEL = 1, Ioh is 6 x IREF VDDI O 2.5V CPU Clock Outputs for Chipset. See Table 1. 14,15,17,18 PCI (3:6) VDDPCI O PCI Clock Outputs. Are synchronous to CPU clocks. See Table 1 10 FS1/PCI_F VDDPCI I/O Power-on Bidirectional Input/Output. At power-up, FS0 is the input. When PD the power supply voltage crosses the input threshold voltage, FS1 state is latched and this pin becomes PCI_F clock output. 20 FS3/48M VDD48M I/O Power-on Bidirectional Input/Output. At power-up, FS3 is the input. When PD the power supply voltage crosses the input threshold voltage, FS3 state is latched and this pin becomes 48M, a USB clock output. Note: 2. PU = internal pull-up. PD = internal pull-down. Typically = 250 kΩ (range 200 kΩ to 500 kΩ). Document #: 38-07471 Rev. *D Page 2 of 19 CY28341-2 Pin Description[2] (continued) Pin Number Pin Name PWR I/O Pin Description 11 SELSDR_DDR#/ PCI1 VDDPCI I/O Power-on Bidirectional Input/Output. At power-up, SELSDR_DDR is the PD input. When the power supply voltage crosses the input threshold voltage, SELSDR_DDR state is latched and this pin becomes PCI clock output. SelSDR_DDR#.= 0, DDR Mode. SelSDR_DDR#.= 1, SDR Mode. 21 FS2/24_48M VDD48M I/O Power-on Bidirectional Input/Output. At power-up, FS2 is the input. When PD the power supply voltage crosses the input threshold voltage, FS2 state is latched and this pin becomes 24_48M, a SIO programmable clock output. 6 AGP0 VDDAGP O AGP Clock Output. Is synchronous to CPU clocks. See Table 1 8 AGP2 VDDAGP O AGP Clock Output. Is synchronous to CPU clocks. See Table 1 25 IREF I Current reference programming input for CPU buffers. A precise resistor is attached to this pin, which is connected to the internal current reference. 28 SDATA 27 SCLK 26 PD#/SRESET# 45 BUF_IN If SelSDR_DDR#.= 0, 2.5V CMOS type input to the DDR differential buffers. If SelSDR_DDR#.= 1, 3.3V CMOS type input to the SDR buffer. 46 FBOUT If SelSDR_DDR#.= 0, 2.5V single ended SDRAM buffered output of the signal applied at BUF_IN. It is in phase with the DDRT(0:5) signals.If SelSDR_DDR#.= 1, 3.3V single ended SDRAM buffered output of the signal applied at BUF_IN. It is in phase with the SDRAM(0:11) signals 5 VDDAGP 3.3V power supply for AGP clocks 51 VDDC 3.3V power supply for CPUT/C clocks 16 VDDPCI 3.3V power supply for PCI clocks 55 VDDR 3.3V power supply for REF clock 50 VDDI 2.5V power supply for CPUCS_T/C clocks 22 VDD_48M 3.3V power supply for 48M 23 VDD 3.3V Common power supply 34,40 VDDD If SelSDR_DDR#.= 0, 2.5V power supply for DDR clocksIf SelSDR_DDR#.= 1, 3.3V power supply for SDR clocks. 9 VSSAGP Ground for AGP clocks 13 VSSPCI Ground for PCI clocks 54 VSSC Ground for CPUT/C clocks 33,39 VSSD Ground for DDR clocks 19 VSS_48M Ground for 48M clock 47 VSSI Ground for ICPUCS_T/C clocks 2 VSSR Ground for REF 24 VSS Common Ground Document #: 38-07471 Rev. *D I/O Serial Data Input. Conforms to the Phillips I2C specification of a Slave Receive/Transmit device. It is an input when receiving data. It is an open drain output when acknowledging or transmitting data. I Serial Clock Input. Conforms to the Philips I2C specification. I/O Power-down Input/System Reset Control Output. If Byte6 Bit7 = 0(default), PU this pin becomes a SRESET# open drain output. See system reset description. If Byte6Bit7 = 1, this pin becomes PD# input with an internal pull-up. When PD# is asserted low, the device enters power down mode. See power management function. Page 3 of 19 CY28341-2 Power Management Functions All clocks can be individually enabled or stopped via the two-wire control interface. All clocks are stopped in the low state. All clocks maintain a valid high period on transitions from running to stop and on transitions from stopped to running when the chip was not powered down. On power up, the VCOs will stabilize to the correct pulse widths within about 0.5 ms. Serial Data Interface To enhance the flexibility and function of the clock synthesizer, a two-signal serial interface is provided. Through the Serial Data Interface, various device functions such as individual clock output buffers, etc., can be individually enabled or disabled. The registers associated with the Serial Data Interface initializes to their default setting upon power-up, and therefore use of this interface is optional. Clock device register changes are normally made upon system initialization, if any are required. The interface can also be used during system operation for power management functions. Data Protocol The clock driver serial protocol accepts byte write, byte read, block write, and block read operation from the controller. For block write/read operation, the bytes must be accessed in sequential order from lowest to highest byte (most significant bit first) with the ability to stop after any complete byte has been transferred. For byte write and byte read operations, the system controller can access individual indexed bytes. The offset of the indexed byte is encoded in the command code, as described in Table 2. The block write and block read protocol is outlined in Table 3 while Table 4 outlines the corresponding byte write and byte read protocol.The slave receiver address is 11010010 (D2h). Table 2. Command Code Definition Bit 7 (6:0) Description 0 = Block read or block write operation. 1 = Byte read or byte write operation Byte offset for byte read or byte write operation. For block read or block write operations, these bits should be ‘0000000’ Table 3. Block Read and Block Write Protocol Block Write Protocol Bit 1 2:8 Description Start Slave address – 7 bits Block Read Protocol Bit 1 2:8 Description Start Slave address – 7 bits 9 Write 9 Write 10 Acknowledge from slave 10 Acknowledge from slave 11:18 19 20:27 28 29:36 37 38:45 Command Code – 8-bit ‘00000000’ stands for block operation 11:18 Command Code – 8-bit ‘00000000’ stands for block operation Acknowledge from slave 19 Acknowledge from slave Byte Count – 8 bits 20 Repeat start Acknowledge from slave Data byte 0 – 8 bits Acknowledge from slave Data byte 1 – 8 bits 46 Acknowledge from slave .... Data Byte N/Slave Acknowledge... .... Data Byte N – 8 bits .... Acknowledge from slave .... Stop Document #: 38-07471 Rev. *D 21:27 Slave address – 7 bits 28 Read 29 Acknowledge from slave 30:37 38 39:46 47 48:55 Byte count from slave – 8 bits Acknowledge Data byte from slave – 8 bits Acknowledge Data byte from slave – 8 bits 56 Acknowledge .... Data bytes from slave/Acknowledge .... Data byte N from slave – 8 bits .... Not Acknowledge .... Stop Page 4 of 19 CY28341-2 Table 4. Byte Read and Byte Write Protocol Byte Write Protocol Bit Byte Read Protocol Description 1 Bit Start 2:8 1 Slave address – 7 bits 9 2:8 Write 10 Acknowledge from slave 11:18 19 20:27 Command Code – 8-bit ‘1xxxxxxx’ stands for byte operationbit[6:0] of the command code represents the offset of the byte to be accessed Description Start Slave address – 7 bits 9 Write 10 Acknowledge from slave 11:18 Command Code – 8-bit ‘1xxxxxxx’ stands for byte operationbit[6:0] of the command code represents the offset of the byte to be accessed Acknowledge from slave 19 Acknowledge from slave Byte Count – 8 bits 20 Repeat start 28 Acknowledge from slave 29 stop 21:27 Slave address – 7 bits 28 Read 29 Acknowledge from slave 30:37 Data byte from slave – 8 bits 38 Not Acknowledge 39 stop Serial Control Registers Byte 0: Frequency Select Register Bit @Pup Pin# Name Reserved Description 7 0 6 H/W Setting 21 FS2 Reserved 5 H/W Setting 10 FS1 For Selecting Frequencies in Frequency Selection Table on page 1 4 H/W Setting 1 FS0 For Selecting Frequencies in Frequency Selection Table on page 1 3 0 2 H/W Setting 11 1 H/W Setting 20 FS3 For Selecting frequencies in Frequency Selection Table on page 1 0 H/W Setting 7 SELP4_K7 Only for reading the hardware setting of the CPU interface mode, status of SELP4_K7# strapping. For Selecting Frequencies in Frequency Selection Table on page 1 If this bit is programmed to “1”, it enables WRITE to bits (6:4,1) for selecting the frequency via software (SMBus) If this bit is programmed to a “0” it enable only READ of bits (6:4,1), which reflect the hardware setting of FS(0:3). SELSDR_DDR Only for reading the hardware setting of the SDRAM interface mode, status of SELSDR_DDR# strapping. Byte 1: CPU Clocks Register Bit 7 @Pup 0 6 1 Pin# MODE Name Description 0 = Down Spread. 1 = Center Spread. See Table 9 on page 9 SSCG 1 = Enable (default). 0 = Disable 5 1 SST1 Select spread bandwidth. See Table 9 on page 9 4 1 SST0 Select spread bandwidth. See Table 9 on page 9 3 1 48,49 CPUCS_T, CPUCS_C 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 2 1 53,52 CPUT/CPUOD_T CPUC/CPUOD_C 1 = Output enabled (running). 0 = Output disable. 1 1 53,52 CPUT/C In K7 mode, this bit is ignored.In P4 mode, 0 = when PD# asserted LOW, CPUT stops in a high state, CPUC stops in a low state. In P4 mode, 1 = when PD# asserted LOW, CPUT and CPUC stop in High-Z. 0 1 11 MULT0 Document #: 38-07471 Rev. *D Only for reading the hardware setting of the Pin11 MULT0 value. Page 5 of 19 CY28341-2 Byte 2: PCI Clock Register Bit @Pup Pin# Name Description 7 0 PCI_DRV PCI clock output drive strength 0 = Low strength, 1 = High strength 6 1 10 PCI_F 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 5 1 18 PCI6 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 4 1 17 PCI5 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 3 1 15 PCI4 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 2 1 14 PCI3 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 1 1 12 PCI2 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 0 1 11 PCI1 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. Byte 3: AGP/Peripheral Clocks Register Bit @Pup Pin# 7 0 21 Name Description 24_48M 0 = pin21 output is 24 MHz. Writing a '1' into this register asynchronously changes the frequency at pin21 to 48 MHz. 6 1 20 48MHz 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 5 1 21 24_48M 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 4 0 6,7,8 DASAG1 3 0 6,7,8 DASAG0 Programming these bits allow shifting skew of the AGP(0:2) signals relative to their default value. See Table 5. 2 1 8 AGP2 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 1 1 7 AGP1 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 0 1 6 AGP0 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. Table 5. Dial-a-Skew AGP(0:2) DASAG (1:0) AGP(0:2) Skew Shift 00 Default 01 –280 ps 10 +280 ps 11 +480 ps Byte 4: Peripheral Clocks Register Bit @Pup Pin# Name Description 7 1 20 48M 1 = Low strength, 0 = High strength 1 = strength x 1. 0= strength x 2 6 1 21 24_48M 1 = Low strength, 0 = High strength 1 = strength x 1. 0= strength x 2 5 0 6,7,8 DARAG1 4 0 6,7,8 DARAG0 Programming these bits allow modifying the frequency ratio of the AGP(2:0), PCI(6:1, F) clocks relative to the CPU clocks. See Table 6. 3 1 1 REF0 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 2 1 56 REF1 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 1 1 1 REF0 1 = Low strength, 0 = High strength 0 1 56 REF1 1 = Low strength, 0 = High strength (K7 Mode only) Table 6. Dial-A-Ratio AGP(0:2) DARAG (1:0) CU/AGP Ratio 00 Frequency Selection Default 01 2/1 10 2.5/1 11 3/1 Document #: 38-07471 Rev. *D Page 6 of 19 CY28341-2 Byte 5: SDR/DDR Clock Register Bit @Pup Pin# 45 Name Description 7 0 BUF_IN threshold voltage DDR Mode, BUF_IN threshold setting. 0 = 1.15V, 1 = 1.05VSDR Mode, BUF_IN threshold setting. 0 = 1.35V, 1 = 1.25V 6 1 5 1 29,30 DDRT/C5/SDRAM(10,11) 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 4 1 31,32 DDRT/C4/SDRAM(8,9) 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 3 1 35,36 DDRT/C3/SDRAM(6,7) 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 2 1 37,38 DDRT/C2/SDRAM(4,5) 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 1 1 41,42 DDRT/C1/SDRAM(2,3) 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 0 1 43,44 DDRT/C0/SDRAM(0,1) 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. 46 FBOUT 1 = Output enabled (running). 0 = Output disabled asynchronously in a low state. Byte 6: Watchdog Register Bit @Pup Pin# 7 0 6 26 Name Description SRESET# 1 = Pin 26 is the input pin as PD# signal. 0 = Pin 26 is the output pin as SRESET# signal. 0 Frequency Revert This bit allows setting the Revert Frequency once the system is rebooted due to Watchdog time out only.0 = selects frequency of existing H/W setting1 = selects frequency of the second to last S/W setting. (the software setting prior to the one that caused a system reboot). 5 0 WDTEST For IMI Test - WD-Test, ALWAYS program to '0' 4 0 WD Alarm This bit is set to “1” when the Watchdog times out. It is reset to “0” when the system clears the WD time stamps (WD3:0). 3 0 WD3 This bit allows the selection of the time stamp for the Watchdog timer. See Table 7 2 0 WD2 This bit allows the selection of the time stamp for the Watchdog timer. See Table 7 1 0 WD1 This bit allows the selection of the time stamp for the Watchdog timer. See Table 7 0 0 WD0 This bit allows the selection of the time stamp for the Watchdog timer. See Table 7 Table 7. Watchdog Time Stamp WD3 WD2 WD1 WD0 0 0 0 0 Off FUNCTION 0 0 0 1 1 second 0 0 1 0 2 seconds 0 0 1 1 3 seconds 0 1 0 0 4 seconds 0 1 0 1 5 seconds 0 1 1 0 6 seconds 0 1 1 1 7 seconds 1 0 0 0 8 seconds 1 0 0 1 9 seconds 1 0 1 0 10 seconds 1 0 1 1 11 seconds 1 1 0 0 12 seconds 1 1 0 1 13 seconds 1 1 1 0 14 seconds 1 1 1 1 15 seconds Byte 7: Dial-a-Frequency Control Register N Bit @Pup Pin# Document #: 38-07471 Rev. *D Name Description Page 7 of 19 CY28341-2 Byte 7: Dial-a-Frequency Control Register N 7 0 Reserved Reserved for device function test. 6 0 N6, MSB 5 0 N5 4 0 N4 3 0 N3 These bits are for programming the PLL’s internal N register. This access allows the user to modify the CPU frequency at very high resolution (accuracy). All other synchronous clocks (clocks that are generated from the same PLL, such as PCI) remain at their existing ratios relative to the CPU clock. 2 0 N2 1 0 N3 0 0 N0, LSB Byte 8: Silicon Signature Register (all bits are read-only) Bit @Pup Pin# Name Description 7 0 Revision_ID3 Revision ID bit [3] 6 0 Revision_ID2 Revision ID bit [2] 5 0 Revision_ID1 Revision ID bit [1] 4 1 Revision_ID0 Revision ID bit [0] 3 1 Vendor_ID3 Cypress's Vendor ID bit [3]. 2 0 Vendor_ID2 Cypress's Vendor ID bit [2]. 1 0 Vendor_ID1 Cypress's Vendor ID bit [1]. 0 0 Vendor_ID0 Cypress's Vendor ID bit [0]. Byte9: Dial-A-Frequency Control Register R Bit @Pup Pin# Name 7 0 6 0 R5, MSB 5 0 R4 4 0 R3 3 0 R2 2 0 R1 1 0 R0 0 0 DAF_ENB Description Reserved These bits are for programming the PLL’s internal R register. This access allows the user to modify the CPU frequency at very high resolution (accuracy). All other synchronous clocks (clocks that are generated from the same PLL, such as PCI) remain at their existing ratios relative to the CPU clock. R and N register mux selection. 0 = R and N values come from the ROM. 1 = data is load from DAF (SMBus) registers. Dial-a-Frequency Feature SMBus Dial-a-Frequency feature is available in this device via Byte7 and Byte9. P is a PLL constant that depends on the frequency selection prior to accessing the Dial-a-Frequency feature. Table 8. FS(4:0) XXXXX Document #: 38-07471 Rev. *D P 96016000 Page 8 of 19 CY28341-2 Spread Spectrum Clock Generation (SSCG) Spread Spectrum is enabled/disabled via SMBus register Byte 1, Bit 7. Table 9. Spread Spectrum Table Mode SST1 SST0 % Spread 0 0 0 +0.14, –1.23 0 0 1 +0, –1.00 0 1 0 +0, –0.60 0 1 1 +0, –0.52 1 0 0 +0.72, –0.71 1 0 1 +0.47, –0.49 1 1 0 +0.34, –0.33 1 1 1 +0.30, –0.28 Swing Select Functions Through Hardware MULTSEL Board Target Trace/Term Z Reference R, IREF = VDD/(3*Rr) Output Current VOH@Z 0 50 Ohm Rr = 221 1%, IREF = 5.00 mA IOH = 4* Iref 1.0V@50 1 50 Ohm Rr = 475 1%, IREF = 2.32 mA IOH = 6* Iref 0.7V@50 System Self Recovery Clock Management This feature is designed to allow the system designer to change frequency while the system is running and reboot the operation of the system in case of a hang up due to the frequency change. When the system sends an SMBus command requesting a frequency change through Byte 4 or through bytes 13 and 14, it must have previously sent a command to byte 12, for selecting which time out stamp the Watchdog must perform, otherwise the System Self Recovery feature will not be applicable. Consequently, this device will change frequency and then the Watchdog timer starts timing. Meanwhile, the system BIOS is running its operation with the new frequency. If this device receives a new SMBus command to clear the bits originally programmed in Byte 12, bits (3:0) (reprogram to 0000), Document #: 38-07471 Rev. *D before the Watchdog times out, then this device will keep operating in its normal condition with the new selected frequency. If the Watchdog times out the first time before the new SMBus reprograms Byte 12, bits (3:0) to (0000), then this device will send a low system reset pulse, on SRESET# (see byte12, bit7), and changes WD alarm (Byte12, Bit4) status to “1” then restarts the Watchdog timer again. If the Watchdog times out a second time, then this device will send another low pulse on SRESET#, will relatch original hardware strapping frequency (or second to last software selected frequency, see byte12, bit6) selection, set WD alarm bit (Byte12, bit4) to ‘1,’ then start WD timer again. The above-described sequence will keep repeating until the BIOS clears the SMBus byte12 bits (3:0). Once the BIOS sets Byte 12 bits (3:0) = 0000, then the Watchdog timer is turned off and the WD alarm bit (Byte 12, bit4) is reset to ‘0.’ Page 9 of 19 CY28341-2 S y s t e m r u n n in g w it h o r ig in a lly s e le c t e d f r e q u e n c y v ia h a r d w a r e s t r a p p in g . N o F r e q u e n c y w ill c h a n g e b u t S y s t e m S e lf R e c o v e r y n o t a p p lic a b le ( n o t im e s t a m p s e le c t e d a n d b y t e 1 2 , b it ( 3 : 0 ) is s t ill = "0 0 0 0 " R e c e iv e F r e q u e n c y C h a n g e R e q u e s t v ia S M B u s B y t e 4 o r V ia D ia la -fre q u e n c y ? Y e s C h a n g e to a n e w fre q u e n c y N o Is S M B u s B y te 9 , tim e o u t s t a m p e n a b le d - ( b y t e 1 2 , b it (3 :0 ) 0 0 0 0 )? 1 ) S e n d a n o th e r 3 m S lo w p u ls e o n S 2 ) R e la t c h o r ig in a l h a r d w a r e s t r a p p in f o r r e t u r n t o o r ig in a l f r e q u e n c y s e t t in g 3 ) S e t W D A la r m b it ( b y t e 1 2 , B it 4 ) t o 4 ) S ta r t W D tim e r Y e s R E S E T g s e le c tio n s . "1 " S t a r t in t e r n a l w a t c h d o g t im e r . Y e s W a t c h D o g t im e o u t ? 1 ) S e n d S R E S E T p u ls e 2 ) S e t W D b it ( b y t e 1 2 , b it 4 ) t o '1 ' 3 ) S t a r t W D t im e r Y e s W a t c h D o g t im e o u t ? N o N o S M B u s b y te 1 2 tim e o u t s t a m p d is a b le d ? N o S M B u s b y te 9 tim e o u t s t a m p d is a b le d , B y t e 1 2 , b it ( 3 : 0 ) = ( 0 0 0 0 ) ? N o Y e s Y e s T u r n o ff w a tc h d o g tim e r . K e e p n e w f r e q u e n c y s e t t in g . S e t W D b it ( b y t e 1 2 , b it 4 ) t o ''0 ' a la r m Figure 1. Watchdog Recovery Clock P4 Processor SELP4_K7# = 1 Power-down Assertion (P4 Mode) When PD# is sampled low by two consecutive rising edges of CPU# clock then all clock outputs except CPU clocks must be held low on their next high to low transition. CPU clocks must be held with the CPU clock pin driven high with a value of 2 x Iref, and CPU# undriven. Note that Figure 1 shows CPU = 133 MHz. This diagram and description are applicable for all valid CPU frequencies 66, 100, 133, 200 MHz. Due to the state of internal logic, stopping and holding the REF clock outputs in the LOW state may require more than one clock cycle to complete. Power-down Deassertion (P4 Mode) The power-up latency needs to less than 3 ms. PW RDW N# CPUT 133M Hz CPUT# 133M Hz PCI 33M Hz AG P 66M Hz USB 48M Hz R E F 1 4 .3 1 8 M H z DDRT 133M Hz DDRC 133M Hz SDRAM 133M Hz Figure 2. Power-down Assertion Timing Waveform (in P4 mode) Document #: 38-07471 Rev. *D Page 10 of 19 CY28341-2 < 1 .5 m s e c PW RDW N# CPU 133MHz CPU# 133MHz PCI 33MHz AG P 66MHz USB 48MHz R E F 1 4 .3 1 8 M H z DDRT 133MHz DDRC 133MHz SDRAM 133MHz Figure 3. Power-down Deassertion Timing Waveform (in P4 mode) AMD K7 processor SELP4_K7# = 0 Power-down Assertion (K7 Mode) When the PD# signal is asserted LOW, all clocks are disabled to a low level in an orderly fashion prior to removing power from the part. When PD# is asserted (forced) LOW, the device transitions to a shutdown (power-down) mode and all power supplies may then be removed. When PD# is sampled LOW by two consecutive rising edges of CPU clock, then all affected clocks are stopped in a LOW state as soon as possible. When in power-down (and before power is removed), all outputs are synchronously stopped in a LOW state (see Figure 3 below), all PLL’s are shut off, and the crystal oscillator is disabled. When the device is shut down, the I2C function is also disabled. PW RDW N# C P U O D _T 133M H z C P U C S _T 133M H z C P U O D _C 133M H z C P U C S _C 133M H z P C I 33M H z A G P 66M H z U S B 48M H z R E F 14.318M H z D D R T 133M H z D D R C 133M H z S D R A M 133M H z Figure 4. Power-down Assertion Timing Waveform (in K7 mode) Document #: 38-07471 Rev. *D Page 11 of 19 CY28341-2 Power-down Deassertion (K7 Mode) When deasserted PD# to HIGH level, all clocks are enabled and start running on the rising edge of the next full period in order to guarantee a glitch-free operation, no partial clock pulses. < 1 .5 m se c PW RDW N# CPU 133MHz CPU# 133MHz PCI 33MHz AGP 66MHz USB 48MHz R E F 1 4 .3 1 8 M H z DDRT 133MHz DDRC 133MHz SDRAM 133MHz Figure 5. Power-down Deassertion Timing Waveform (in K7 Mode) VID (0:3), SEL (0,1) VTT_PW RGD# PW RGD 0.2-0.3m S Delay VDD Clock Gen Clock State Clock Outputs Clock VCO State 0 W ait for VTT_GD# State 1 State 2 Off Off Sam ple Sels State 3 On (Note A) On Figure 6. VTT_PWGD# Timing Diagram (With Advanced PIII Processor SelP4_K7 = 1)[3] Note: 3. This time diagram shows that VTT_PWRGD# transits to a logic low in the first time at power-up. After the first high-to-low transition of VTT_PWRGD#, device is not affected, VTT_PWRGD# is ignored. Document #: 38-07471 Rev. *D Page 12 of 19 W RG D# ow CY28341-2 D e la y 0 .2 5 m S S2 =L VT TP S1 W a it f o r 1 .1 4 6 m s S a m p le In p u ts F S ( 3 :0 ) E n a b le O u tp u te s V D D A = 2 .0 V S0 S3 P o w e r O ff N o rm a l O p e r a tio n V D D 3 .3 = O f f Figure 7. Clock Generator Power-up/Run State Diagram (with P4 processor SELP4_K7#=1) Connection Circuit DDRT/C Signals For open-drain CPU output signals (with K7 processor SELP4_K7#=0) 150 Ohm CPUOD_T 47 Ohm VDDCPU(1.5V) VDDCPU(1.5V) 3.3V 60.4 Ohm 52 Ohm 5" 500 Ohm 680 pF 3.3V CPUOD_C 47 Ohm Measurement Point 52 Ohm 1" 500 Ohm 20 pF 301 Ohm 150 Ohm 52 Ohm 5" VDDCPU(1.5V) 52 Ohm 1" 500 Ohm 680 pF 60.4 Ohm 500 Ohm Measurement Point 20 pF VDDCPU(1.5V) Figure 8. K7 Load Termination 6” 6” Table 10.Signal Loading Table Clock Name REF (0:1), 48MHz (USB), 24_48MHz AGP(0:2), SDRAM (0:11) PCI_F(0:5) DDRT/C (0:5), FBOUT CPUT/C CPUOD_T/C CPUCS_T/C Document #: 38-07471 Rev. *D Figure 9. CS Load Termination Max Load (in pF) 20 30 30 For Differential CPU Output Signals (with P4 Processor SELP4_K7= 1) The following diagram shows lumped test load configurations for the differential Host Clock outputs. See Figure 10 See Figure 8 See Figure 9 Page 13 of 19 CY28341-2 CLK Measurement Point T PCB CPUT RtA1 RLA1 RtB1 R LB1 CLA RD MULTSEL CLK Measurement Point T PCB CPUT# RtA2 RLA2 RtB2 R LB2 CLB Rref Figure 10. P4 Load Termination Table 11.Lumped Test Load Configuration Component 0.7V Amplitude Value 1.0V Amplitude Value RtA1, RtA2 33Ω 0Ω RLA1, RLA2 49.9Ω ∞ TPCB 3” 50 ΩZ 3” 50 ΩZ RLB1, RLB2 ∞ 63Ω RD ∞ 470Ω RtB1, RtB2 0Ω 33Ω CLA, CLB 2 pF 2 pF Rref 475Ω w/mult0 = 1 221Ω w/mult0 = 0 Group Timing Relationships and Tolerances[4] Offset (ps) tCSAGP CPUCS to AGP tAP AGP to PCI 0ns Tolerance (ps) Conditions 750 500 CPUCS Leads 1,250 500 AGP Leads 10ns 20ns 30ns CPU CLOCK 66.6MHz CPU CLOCK 100MHz CPU CLOCK 133.3MHz tCSAGP AGP CLOCK 66.6MHz tAP PCI CLOCK 33.3MHz Note: 4. Ideally the probes should be placed on the pins. If there is a transmission line between the test point and the pin for one signal of the pair (e.g., CPU), the same length transmission line should be added to the other signal of the pair (e.g., AGP). Document #: 38-07471 Rev. *D Page 14 of 19 CY28341-2 Maximum Ratings[5] Storage Temperature: ................................ –65°C to + 150°C This device contains circuitry to protect the inputs against damage due to high static voltages or electric field. However, precautions should be take to avoid application of any voltage higher than the maximum rated voltages to this circuit. For proper operation, VIN and VOUT should be constrained to the range: Operating Temperature: .................................... 0°C to +70°C VSS < (VIN or VOUT) < VDD. Input Voltage Relative to VSS:.............................. VSS – 0.3V Input Voltage Relative to VDDQ or AVDD: ............. VDD + 0.3V Maximum ESD .............................................................2000V Unused inputs must always be tied to an appropriate logic voltage level (either VSS or VDD). Maximum Power Supply: ................................................5.5V DC Parameters (VDD = VDDPCI = VDDAGP = VDDR = VDD48M = VDDC = 3.3V±5%, VDDI = VDD = 2.5±5%, TA = 0°C TO +70°C) Parameter VIL1 VIH1 VIL2 VIH2 VOL IOL IOZ IDD3.3V IDD2.5V IPD IPUP IPDWN CIN COUT LPIN CXTAL Description Input Low Voltage Input High Voltage Input Low Voltage Input High Voltage Output Low Voltage for SRESET# Pull-down current for SRESET# Three-state leakage Current Dynamic Supply Current Dynamic Supply Current Power-down Supply current Internal Pull-up Device Current Internal Pull-down Device Current Input Pin Capacitance Output Pin Capacitance Pin Inductance Crystal Pin Capacitance Conditions Applicable to PD#, F S(0:4) Min. Typ. Max. 0.8 2.0 Applicable to SDATA and SCLK 1.0 2.2 0.4 24 IOL VOL = 0.4V 35 CPU frequency set at 133.3 MHz, Note 6 CPU frequency set at 133.3 MHz, Note 6 PD# = 0 Input @ VSS Input @ VDD Measured from the Xin or Xout to VSS 10 190 195 600 –25 10 5 6 7 45 150 175 95 27 36 Unit Vdc Vdc Vdc Vdc V mA µA mA mA µA µA µA pF pF pF pF AC Parameters Parameter Description XTAL TDC Xin Duty Cycle Xin Period TPERIOD Xin High Voltage VHIGH Xin Low Voltage VLOW Xin Rise and Fall Times TR/TF Xin Cycle to Cycle Jitter TCCJ Crystal Start-up Time TXS P4 Mode CPU at 0.7V TDC CPUT/C Duty Cycle CPUT/C Period TPERIOD 100 MHz Min. Max. 133 MHz Min. Max 200 MHz Min. Max. 45 69.84 0.7VDD 0 55 71.00 VDD .3VDD 10.0 500 30 45 69.84 0.7VDD 0 55 71.0 VDD .3VDD 10 500 30 45 69.84 0.7VDD 0 55 71.0 VDD .3VDD 10 500 30 45 9.85 55 10.2 45 7.35 55 7.65 45 4.85 55 5.1 Unit % ns V V ns ps ms Notes 7,14 7,14 12 15 13 8,11 10,12 % 7,8,9,15,16 ns 7,8,9,15,16 Notes: 5. Multiple Supplies: The voltage on any input or I/O pin cannot exceed the power pin during power-up. Power supply sequencing is NOT required. 6. All outputs loaded as per maximum capacitive load table. 7. This parameter is measured as an average over a 1-us duration, with a crystal center frequency of 14.31818 MHz. 8. All outputs loaded as per loading specified in theTable 11. 9. Probes are placed on the pins, and measurements are acquired at 1.5V for 3.3V signals and at 1.25V for 2.5V, and 50% point for differential signals. 10. Probes are placed on the pins, and measurements are acquired at 0.4V. 11. When Xin is driven from and external clock source (3.3V parameters apply). 12. When crystal meets minimum 40-ohm device series resistance specification. 13. Measured between 0.2VDD and.7VDD. 14. This is required for the duty cycle on the REF clock out to be as specified. The device will operate reliably with input duty cycles up to 30/70 but the REF clock duty cycle will not be within data sheet specifications. 15. Measured at VX, or where subtraction of CLK-CLK# crosses 0V. 16. See Figure 10 for 0.7V loading specification. Document #: 38-07471 Rev. *D Page 15 of 19 CY28341-2 AC Parameters (continued) 100 MHz 133 MHz Parameter Description Min. Max. Min. Max TR/TF CPUT/C Rise and Fall Times 175 700 175 700 Rise/Fall Matching 20% 20% Rise/Fall Time Variation 125 125 ∆ TR/TF CPUCS_T/C to CPUT/C Clock Skew 0 200 0 150 TSKEW TCCJ CPUT/C Cycle to Cycle Jitter –150 +150 –150 +150 Crossing Point Voltage at 0.7V Swing 280 430 280 430 VCROSS P4 Mode CPU at 1.0V TDC CPUT/C Duty Cycle 45 55 45 55 TPERIOD CPUT/C Period 9.85 10.2 7.35 7.65 CPUT/C Rise and Fall times 175 467 175 467 Differential TR/TF TSKEW CPUCS_T/C to CPUT/C Clock Skew 0 200 0 150 CPUT/C Cycle to Cycle Jitter –150 +150 –150 +150 TCCJ Crossing Point Voltage at 1V Swing 510 760 510 760 VCROSS SE-DeltaSlew Absolute Single-ended Rise/Fall 325 325 Waveform Symmetry K7 Mode TDC CPUOD_T/C Duty Cycle 45 55 45 55 TPERIOD CPUOD_T/C Period 9.98 10.5 7.5 8.0 CPUOD_T/C Low Time 2.8 1.67 TLOW CPUOD_T/C Fall Time 0.4 1.6 0.4 1.6 TF TSKEW CPUCS_T/C to CPUT/C Clock Skew 0 200 0 150 CPUOD_T/C Cycle-to-Cycle Jitter –150 +150 –150 +150 TCCJ Differential Voltage AC 0.4 Vp+0.6V 0.4 Vp+0.6V VD VX Differential Crossover Voltage 500 1100 500 1100 CHIPSET CLOCK TDC CPUCS_T/C Duty Cycle 45 55 45 55 CPUCS_T/C Period 10.0 10.5 15 15.5 TPERIOD TR / TF CPUCS_T/C Rise and Fall Times 0.4 1.6 0.4 1.6 Differential Voltage AC 0.4 Vp+.06V 0.4 Vp+.06V VD Differential Crossover Voltage 0.5*VDDI 0.5*VDDI 0.5*VD 0.5*VDDI VX –0.2 +0.2 +0.2 DI–0.2 AGP TDC AGP(0:2) Duty Cycle 45 55 45 55 AGP(0:2) Period 15 16 15 16 TPERIOD AGP(0:2) High Time 5.25 5.25 THIGH AGP(0:2) Low Time 5.05 5.05 TLOW AGP(0:2) Rise and Fall Times 0.4 1.6 0.4 1.6 TR / TF 200 MHz Min. Max. 175 700 20% 125 0 200 –200 +200 280 430 Unit Notes ps 24 24,26 ps 8,24,16 ps 8,18,15,16 ps 8,18,15,16 mV 16 45 4.85 175 55 5.1 467 % 8,9,15 nS 8,9,15 ps 7,14,27 0 –200 510 200 +200 760 325 0 ps mV ps 8,14,11 8,14,11 27 26 45 55 % 5 5.5 ns 2.8 ns 0.4 1.6 ns 0 200 0 –200 +200 ps 0.4 Vp+.06V V 500 1100 mV 8,9 8,9 8,9 8,13 8,14,11 8,9 23 23 45 55 % 10.0 10.5 ns 0.4 1.6 ns .4 Vp+.06V V 0.5*VD 0.5*VDDI V +0.2 DI–0.2 45 15 5.25 5.05 0.4 55 16 1.6 % ns ns ns ns 7,8,9 7,8,9 7,8,13 24 11 7,8,9 7,8,9 8,21 8,10 8,13 Notes: 17. Probes are placed on the pins, and measurements are acquired between 0.4V and 2.4V for 3.3V signals and between 0.4V and 2.0V for 2.5V signals, and between 20% and 80% for differential signals. 18. This measurement is applicable with Spread ON or spread OFF. 19. Probes are placed on the pins, and measurements are acquired at 2.4V for 3.3V signals and at 2.0V for 2.5V signals). 20. Time specified is measured from when all VDDs reach their respective supply rail (3.3V and 2.5V) till frequency output is stable and operating within specs. 21. The typical value of VX is expected to be 0.5*VDDD (or 0.5*VDDC for CPUCS signals) and will track the variations in the DC level of the same. 22. VD is the magnitude of the difference between the measured voltage level on a DDRT (and CPUCS_T) clock and the measured voltage level on its complementary DDRC (and CPUCS_C) one. 23. Measured at VX between the rising edge and the following falling edge of the signal. 24. Measured from VOL = 0.175V to VOH = 0.525V. 25. Measurement taken from differential waveform, from –0.35V to +0.35V. 26. Measurements taken from common mode waveforms, measure rise/fall time from 0.41V to 0.86V. Rise/fall time matching is defined as “the instantaneous difference between maximum clk rise (fall) and minimum clk# fall (rise) time, or minimum clk rise (fall) and maximum clk# fall (rise) time”. This parameter is designed for waveform symmetry. 27. Measured in absolute voltage, i.e., single-ended measurement. Document #: 38-07471 Rev. *D Page 16 of 19 CY28341-2 AC Parameters (continued) Parameter TSKEW TCCJ PCI TDC TPERIOD THIGH TLOW TR / TF TSKEW TCCJ 48 MHz TDC TPERIOD TR / TF TCCJ 24 MHz TDC TPERIOD TR / TF TCCJ REF TDC TPERIOD TR / TF TCCJ Description Any AGP to Any AGP Clock Skew AGP(0:2) Cycle-to-Cycle Jitter PCI(_F,1:6) Duty Cycle PCI(_F,1:6) Period PCI(_F,1:6) High Time PCI(_F,1:6) Low Time PCI(_F,1:6) Rise and Fall Times Any PCI to Any PCI Clock Skew PCI(_F,1:6) Cycle-to-Cycle Jitter 100 MHz Min. Max. 250 500 133 MHz Min. Max 250 500 200 MHz Min. Max. 250 500 45 30.0 12.0 12.0 0.5 45 30.0 12.0 12.0 0.5 45 30.0 12.0 12.0 0.5 55 2.5 500 500 55 2.5 500 500 55 2.5 500 500 Unit Notes ps 8,14 ps 8,9,14 % ns ns ns ns ps ps 7,8,9 7,8,9 8,21 8,10 8,13 8,14 8,9,14 48-MHz Duty Cycle 48-MHz Period 48-MHz Rise and Fall Times 48-MHz Cycle-to-Cycle Jitter 45 20.8299 1.0 55 20.8333 4.0 500 45 55 45 55 20.8299 20.8333 20.8299 20.8333 1.0 4.0 1.0 4.0 500 500 % ns ns ps 7,8,9 7,8,9 8,13 8,9,14 24-MHz Duty Cycle 24-MHz Period 24-MHz Rise and Fall Times 24-MHz Cycle-to-Cycle Jitter 45 41.660 1.0 55 41.667 4.0 500 45 41.660 1.0 55 41.667 4.0 500 45 41.660 1.0 55 41.667 4.0 500 % ns ns ps 7,8,9 7,8,9 8,13 8,9,14 REF Duty Cycle REF Period REF Rise and Fall Times REF Cycle-to-Cycle Jitter 45 69.8413 1.0 55 71.0 4.0 1000 45 69.8413 1.0 55 71.0 4.0 1000 45 69.8413 1.0 55 71.0 4.0 1000 % ns ns ps 7,8,9 7,8,9 8,13 8,9,14 VX Crossing Point Voltage of DDRT/C VD Differential Voltage Swing TDC TPERIOD TR / TF TSKEW TCCJ THPJ TDELAY TSKEW TSTABLE DDRT/C(0:5) Duty Cycle DDRT/C(0:5) Period DDRT/C(0:5) Rise/Fall Slew Rate DDRT/C to any DDRT/C Clock Skew DDRT/C(0:5) Cycle-to-Cycle Jitter DDRT/C(0:5) Half-period Jitter BUF_IN to Any DDRT/C Delay FBOUT to Any DDRT/C Skew All-Clock Stabilization from Power-up 0.5*VDDD 0.5*VDDD 0.5*VDD 0.5*VDD 0.5*VDD 0.5*VDD V 15 –0.2 +0.2 D–0.2 D+0.2 D–0.2 D+0.2 0.7 VDDD + 0.7 VDDD + 0.7 VDDD + V 23 0.6 0.6 0.6 45 55 45 55 45 55 % 11 9.85 10.2 14.85 15.3 9.85 10.2 ns 11 1 3 1 3 1 3 V/ns 13 100 100 100 ps 8,14,11 ±75 ±75 ±75 ps 8,14,11 ±100 ±100 ±100 ps 8,14,11 1 4 1 4 1 4 ns 8,9 100 100 100 ps 8,9 3 3 3 ms 22 DDR Ordering Information Part Number CY28341OC–2 CY28341OC–2T CY28341ZC–2 CY28341ZC–2T Lead-free CY28341OXC–2 CY28341OXC–2T Package Type 56-pin Shrunk Small Outline package (SSOP) 56-pin Shrunk Small Outline package (SSOP)–Tape and Reel 56-pin Thin Shrunk Small Outline package (TSSOP) 56-pin Thin Shrunk Small Outline package (TSSOP)–Tape and Reel Product Flow Commercial, 0° to 70°C Commercial, 0° to 70°C Commercial, 0° to 70°C Commercial, 0° to 70°C 56-pin Shrunk Small Outline package (SSOP) 56-pin Shrunk Small Outline package (SSOP)–Tape and Reel Commercial, 0° to 70°C Commercial, 0° to 70°C Document #: 38-07471 Rev. *D Page 17 of 19 CY28341-2 Package Drawing and Dimensions 56-Lead Thin Shrunk Small Outline Package, Type II (6 mm x 12 mm) Z56 0.249[0.009] 28 1 DIMENSIONS IN MM[INCHES] MIN. MAX. REFERENCE JEDEC MO-153 7.950[0.313] 8.255[0.325] PACKAGE WEIGHT 0.42gms 5.994[0.236] 6.198[0.244] PART # Z5624 STANDARD PKG. ZZ5624 LEAD FREE PKG. 29 56 13.894[0.547] 14.097[0.555] 1.100[0.043] MAX. GAUGE PLANE 0.25[0.010] 0.20[0.008] 0.851[0.033] 0.950[0.037] 0.500[0.020] BSC 0.170[0.006] 0.279[0.011] 0.051[0.002] 0.152[0.006] 0°-8° SEATING PLANE 0.508[0.020] 0.762[0.030] 0.100[0.003] 0.200[0.008] 51-85060-*C 56-Lead Shrunk Small Outline Package O56 51-85062-*C 2 Purchase of I C components from Cypress or one of its sublicensed Associated Companies conveys a license under the Philips I2C Patent Rights to use these components in an I2C system, provided that the system conforms to the I2C Standard Specification as defined by Philips. VIA is a trademark of VIA Technologies, Inc. Pentium 4 is a registered trademark of Intel Corporation. Athlon is a trademark of AMD Corporation, Inc. Dial-a-Frequency is a registered trademark, and Dial-a-Skew, Dial-a-dB, and Dial-a-Ratio are trademarks, of Cypress Semiconductor. All product and company names mentioned in this document are the trademarks of their respective holders. Document #: 38-07471 Rev. *D Page 18 of 19 © Cypress Semiconductor Corporation, 2005. The information contained herein is subject to change without notice. Cypress Semiconductor Corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a Cypress product. Nor does it convey or imply any license under patent or other rights. Cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement with Cypress. Furthermore, Cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. The inclusion of Cypress products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges. CY28341-2 Document History Page Document Title: CY28341-2 Universal Clock Chip for VIA™P4M/KT/KM400 DDR Systems Document Number: 38-07471 REV. ECN NO. Issue Date Orig. of Change Description of Change ** 118589 09/18/02 RGL New Data Sheet *A 122938 12/19/02 RBI Add power up requirements to maximum ratings information *B 124914 04/23/03 RGL Fixed pin 1 and pin 2 in Pin Description table Added KT400 feature to Features section Corrected Figure 8 (K7 Load Termination) diagram Simplified title *C 127161 06/10/03 RGL Fixed Spread Spectrum table *D 333216 See ECN RGL Added Lead-free for SSOP device Document #: 38-07471 Rev. *D Page 19 of 19