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CY28446
Clock Generator for Intel Calistoga Chipset
Features
* Compliant to Intel(R) CK410M * Selectable CPU frequencies * Low power differential CPU clock pairs * 100 MHz Low power differential SRC clocks * 96 MHz Low power differential DOT clock * 48 MHz USB clock * SRC clocks stoppable through OE# Table 1. Output Configuration Table CPU x2/x3 SRC x9/10 PCI x5 REF x1 DOT96 x1 48M x1 * 33 MHz PCI clocks * Buffered 14.318 MHz reference clock * Low-voltage frequency select input * I2C support with readback capabilities * Ideal Lexmark Spread Spectrum profile for maximum electromagnetic interference (EMI) reduction * 3.3V Power supply * 64 pin QFN package
Pin Configuration
FS_B/TEST_MODE VTTPWRGD#/PD FS_C/TEST_SEL PCIF0/ITP_EN USB_48/FS_A
DOTC_96
DOTT_96
VDD_PCI
VSS_PCI
VSS_PCI
VDD_48
OE1#
PCI0
PCI1
PCI2
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 VSS_48 SRCT0 SRCC0 OE0# SRCT1 SRCC1 OEA# SRCT2 SRCC2 VDD_SRC VSS_SRC OE3# SRCT3 SRCC3 OE6# PCI_STOP# 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 VDD_SRC SRCC5 SRCC6 SRCT5 SRCT6 SRCT8 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 VDD_SRC VSS_SRC SRCC10 SRCT10 CPUC2_ITP/SRCC7 CPUT2_ITP/SRCT7 VDD_PCI REF VSS_REF XIN XOUT VDD_REF SDATA SCLK CPU_STOP# CPUT0 CPUC0 VSS_CPU VDD_CPU CPUT1 CPUC1 VSS_SRC
CY28446
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 SRCC8 OEB# SRCC9 SRCT9
Rev 1.0, November 20, 2006
2200 Laurelwood Road, Santa Clara, CA 95054 Tel:(408) 855-0555 Fax:(408) 855-0550
PCI3
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www.SpectraLinear.com
CY28446
Table 2. Frequency Table FS_C MID 0 0 0 0 MID MID MID 1 1 1 FS_B 0 0 1 1 0 0 1 1 0 1 1 FS_A 1 1 1 0 0 0 0 1 x 0 1 Reserved Hi-Z REF/2 REF/2 100 Hi-Z REF/8 REF/8 33 Hi-Z REF/24 REF/24 14.318 Hi-Z REF REF 100 Hi-Z REF/8 REF/8 96 Hi-Z REF REF
48
CPU 100 133 166 200
SRC/SATA 100 100 100 100
PCIF/PCI 33 33 33 33
REF 14.318 14.318 14.318 14.318
LCD 100 100 100 100
DOT96 96 96 96 96
USB 48 48 48 48
Hi-Z REF REF
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Pin Description
Pin No. 1 Name VSS_48 Type GND Ground for outputs. O, DIF 100 MHz Differential serial reference clocks Description
2, 3, 5, 6, 8, SRC(0:3, 5:6, 8:10) 9, 13, 14, 18, [T/C] 19, 20, 21, 22, 23, 25, 26, 27, 28 4, 7, 12, 15, 24, 64 10, 17, 29, 11, 30, 33 16 31, 32 OE[0, 1, 3, 6, A, B]# VDD_SRC VSS_SRC PCI_STP#
I, PU 3.3V LVTTL input for enabling assigned SRC clock (active LOW) PWR 3.3V power supply for outputs. GND Ground for outputs. I, PU 3.3V LVTTL input for PCI_STP# Stops SRC and PCI clocks not set to free running in the SMBUS registers.
CPU2_ITPT/SRCT7, O, DIF Selectable differential CPU clock/100 MHz Differential serial reference clock. CPU2_ITPC/SRCC7 Selectable via Pin 53 PCIF0/ITP_EN O, DIF Differential CPU clock outputs. PWR 3.3V power supply for outputs. GND Ground for outputs. I, PU 3.3V LVTTL input for CPU_STP# active LOW. I I/O, OD SMBus-compatible SCLOCK. SMBus-compatible SDATA. VDD_CPU VSS_CPU CPU_STP# SCLK SDATA VDD_REF XOUT XIN VSS_REF REF VDD_PCI PCIF0/ITP_EN
34, 35, 38, 39 CPUT/C[0:1] 36 37 40 41 42 43 44 45 46 47 48, 54 53
PWR 3.3V power supply for outputs. O, SE 14.318 MHz crystal output. I 14.318 MHz crystal input. GND Ground for outputs. O,SE Fixed 14.318 MHz clock output. PWR 3.3V power supply for outputs. O, SE 33 MHz clock output I/O, PD 33 MHz clock output (not stoppable by PCI_STOP#)/3.3V LVTTL input for selecting pins 31/32 (CPU2_ITP[T/C]/SRC7[T/C]) (sampled on the VTT_PWRGD# assertion). 0 (default): SRC7[T/C] 1: CPU2_ITP[T/C] GND Ground for outputs. I, PD 3.3V LVTTL input. This pin is a level sensitive strobe used to latch the FS_A, FS_B, FS_C, and all I/O configuration pins,. After VTT_PWRGD# (active LOW) assertion, this pin becomes a real-time input for asserting power-down (active HIGH). I, PD 3.3V-tolerant input for CPU frequency selection/Selects test mode if pulled to VIMFS_C when VTT_PWRGD# is asserted LOW. Refer to DC Electrical Specifications table for VILFS_C,VIMFS_C,VIHFS_C specifications. I/O, PU Fixed 48 MHz clock output/3.3V-tolerant input for CPU frequency selection. Refer to DC Electrical Specifications table for Vil_FS and Vih_FS specifications. PWR 3.3V power supply for outputs. O, DIF Fixed 96 MHz clock output. I, PU 3.3V-tolerant input for CPU frequency selection Selects Ref/N or Tri-state when in test mode 0 = Tri-state, 1 = Ref/N Refer to DC Electrical Specifications table for Vil_FS and Vih_FS specifications.
49, 50, 51, 52 PCI[0:3]
55, 59 56
VSS_PCI VTT_PWRGD#/PD
57
FS_C/TEST_SEL
58 60 61,62 63
USB_48/FS_A VDD_48 DOT_96[T/C] FS_B/TEST_MODE
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CY28446
Frequency Select Pins (FS_A, FS_B, and FS_C)
Apply the appropriate logic levels to FSA, FSB, and FSC before CK-PWRGD assertion to achieve host clock frequency selection. When the clock chip sampled HIGH on CK-PWRGD and indicates that VTT voltage is stable then FSA, FSB, and FSC input values are sampled. This process employs a one-shot functionality and once the CK-PWRGD sampled a valid HIGH, all other FSA, FSB, FSC and CK-PWRGD transitions are ignored except in test mode optional. Clock device register changes are made at system initialization if required. The interface cannot 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 operations from the controller. For block write/read operation, access the bytes in sequential order from lowest to highest byte (most significant bit first) with the ability to stop after complete byte has been transferred. For byte write and byte read operations, the system controller accesses individually indexed bytes. The offset of the indexed byte is encoded in the command code, as described in Table 3. The block write and block read protocol is outlined in Table 4 while Table 5 outlines the corresponding byte write and byte read protocol. The slave receiver address is 11010010 (D2h).
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 are individually enabled or disabled. The registers associated with the Serial Data Interface initialize to their default setting at power-up, making this interface Table 3. 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 4. Block Read and Block Write Protocol Block Write Protocol Bit 1 8:2 9 10 18:11 19 27:20 28 36:29 37 45:38 46 .... .... .... .... Start Slave address-7 bits Write Acknowledge from slave Command Code-8 bits Acknowledge from slave Byte Count-8 bits (Skip this step if I2C_EN bit set) Acknowledge from slave Data byte 1-8 bits Acknowledge from slave Data byte 2-8 bits Acknowledge from slave Data Byte/Slave Acknowledges Data Byte N-8 bits Acknowledge from slave Stop Description Bit 1 8:2 9 10 18:11 19 20 27:21 28 29 37:30 38 46:39 47 55:48 56 .... .... .... .... Start Slave address-7 bits Write Acknowledge from slave Command Code-8 bits Acknowledge from slave Repeat start Slave address-7 bits Read = 1 Acknowledge from slave Byte Count from slave-8 bits Acknowledge Data byte 1 from slave-8 bits Acknowledge Data byte 2 from slave-8 bits Acknowledge Data bytes from slave/Acknowledge Data Byte N from slave-8 bits NOT Acknowledge Stop Block Read Protocol Description
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Table 5. Byte Read and Byte Write Protocol Byte Write Protocol Bit 1 8:2 9 10 18:11 19 27:20 28 29 Start Slave address-7 bits Write Acknowledge from slave Command Code-8 bits Acknowledge from slave Data byte-8 bits Acknowledge from slave Stop Description Bit 1 8:2 9 10 18:11 19 20 27:21 28 29 37:30 38 39 Start Slave address-7 bits Write Acknowledge from slave Command Code-8 bits Acknowledge from slave Repeated start Slave address-7 bits Read Acknowledge from slave Data from slave-8 bits NOT Acknowledge Stop Byte Read Protocol Description
Control Registers
Byte 0: Control Register 0 Bit 7 6 5 4 3 2 1 0 @Pup 1 1 1 1 1 1 1 1 Name Description CPU2_ITP[T/C]/SRC7[T/C] CPU2_ITP[T/C]/SRC[T/C]7 Output Enable 0 = Disable (Tri-state), 1 = Enable SRC[T/C]6 SRC[T/C]6 Output Enable 0 = Disable (Tri-state), 1 = Enable SRC[T/C]5 SRC[T/C]5 Output Enable 0 = Disable (Tri-state), 1 = Enable Reserved Reserved SRC[T/C]3 SRC[T/C]3 Output Enable 0 = Disable (Tri-state), 1 = Enable SRC[T/C]2 SRC[T/C]2 Output Enable 0 = Disable (Tri-state), 1 = Enable SRC[T/C]1 SRC[T/C]1 Output Enable 0 = Disable (Tri-state), 1 = Enable SRC[T/C]0 SRC[T/C]0 Output Enable 0 = Disable (Tri-state), 1 = Enable
Byte 1: Control Register 1 Bit 7 6 5 4 3 2 1 @Pup 1 1 1 1 1 1 1 Name PCIF0 DOT_96[T/C] USB_48 REF Reserved CPU[T/C]1 CPU[T/C]0 PCIF0 Output Enable 0 = Disable, 1 = Enable DOT_96 MHz Output Enable 0 = Disable (Tri-state), 1 = Enable USB_48 Output Enable 0 = Disable, 1 = Enable REF Output Enable 0 = Disable, 1 = Enable Reserved CPU[T/C]1 Output Enable 0 = Disable (Tri-state), 1 = Enable CPU[T/C]0 Output Enable 0 = Disable (Tri-state), 1 = Enable Description
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CY28446
Byte 1: Control Register 1 Bit 0 @Pup 0 Name Description CPU PLL Spread Enable PLL1 (CPU PLL) Spread Spectrum Enable 0 = Spread off 1 = Spread on (-0.5% spread spectrum on CPU/SRC/PCI clocks)
Byte 2: Control Register 2 Bit 7 6 5 4 3 2 1 0 @Pup 1 1 1 1 1 1 1 1 Name Reserved Reserved PCI3 PCI2 PCI1 PCI0 Reserved Reserved Reserved set to 1 Reserved set to 1 PCI3 Output Enable 0 = Disable, 1 = Enable PCI2 Output Enable 0 = Disable, 1 = Enable PCI1Output Enable 0 = Disable, 1 = Enable PCI0 Output Enable 0 = Disable, 1 = Enable Reserved set to 1 Reserved set to 1 Description
Byte 3: Control Register 3 Bit 7 6 5 4 3 2 1 0 @Pup 0 0 0 0 0 0 0 0 Name SRC7 Reserved SRC5 Reserved Reserved SRC2 Reserved Reserved Description Allow control of SRC[T/C]7 with assertion of OEB# 0 = Free running, 1 = Stopped with OEB# Reserved set to 0 Allow control of SRC[T/C]5 with assertion of OEB# 0 = Free running, 1 = Stopped with OEB# Reserved set to 0 Reserved set to 0 Allow control of SRC[T/C]2 with assertion of OEB# 0 = Free running, 1 = Stopped with OEB# Reserved set to 0 Reserved set to 0
Byte 4: Control Register 4 Bit 7 6 5 4 3 2 1 0 @Pup 1 0 0 1 0 1 1 1 Name Reserved DOT96[T/C] Reserved Reserved PCIF0 CPU[T/C]2 CPU[T/C]1 CPU[T/C]0 Reserved set to 1 DOT PWRDWN Drive Mode 0 = Driven in PWRDWN, 1 = Tri-state Reserved set to 0 Reserved set to 1 Allow control of PCIF0 with assertion of SW and HW PCI_STP# 0 = Free running, 1 = Stopped with PCI_STP# Allow control of CPU[T/C]2 with assertion of CPU_STP# 0 = Free running, 1 = Stopped with CPU_STP# Allow control of CPU[T/C]1 with assertion of CPU_STP# 0 = Free running, 1 = Stopped with CPU_STP# Allow control of CPU[T/C]0 with assertion of CPU_STP# 0 = Free running, 1 = Stopped with CPU_STP# Description
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CY28446
Byte 5: Control Register 5 Bit 7 6 @Pup 0 0 Name Reserved CPU[T/C]2 Reserved set to 0 CPU[T/C]2 Stop Drive Mode 0 = Driven when CPU_STP# asserted, 1 = Tri-state when CPU_STP# asserted CPU[T/C]1 Stop Drive Mode 0 = Driven when CPU_STP# asserted, 1 = Tri-state when CPU_STP# asserted CPU[T/C]0 Stop Drive Mode 0 = Driven when CPU_STP# asserted, 1 = Tri-state when CPU_STP# asserted SRC[T/C] PWRDWN Drive Mode 0 = Driven when PD asserted, 1 = Tri-state when PD asserted CPU[T/C]2 PWRDWN Drive Mode 0 = Driven when PD asserted, 1 = Tri-state when PD asserted CPU[T/C]1 PWRDWN Drive Mode 0 = Driven when PD asserted, 1 = Tri-state when PD asserted CPU[T/C]0 PWRDWN Drive Mode 0 = Driven when PD asserted, 1 = Tri-state when PD asserted Description
5
0
CPU[T/C]1
4
0
CPU[T/C]0
3 2 1 0
0 0 0 0
SRC[T/C] CPU[T/C]2 CPU[T/C]1 CPU[T/C]0
Byte 6: Control Register 6 Bit 7 6 5 4 3 @Pup 0 0 1 0 1 Name REF/N or Tri-state Select REF/N or Tri-state Select 1 = REF/N, 0 = Tri-state Test Mode Reserved REF Test Mode Control 1 = Ref/N or Tristate, 0 = Normal Operation Reserved set to 1 REF Output Drive Strength 0 = Low, 1 = High Description
SW PCI_STP Function PCI and PCIF clock outputs except those set 0 = SW PCI_STP assert, 1 = SW PCI_STP deassert When this bit is set to 0, all STOPPABLE PCI and PCIF outputs are to free running stopped in a synchronous manner with no short pulses. When this bit is set to 1, all STOPPED PCI and PCIF outputs resumes in a synchronous manner with no short pulses. FS_C FS_B FS_A FSC Reflects the value of the FS_C pin sampled on power-up 0 = FSC was low during VTT_PWRGD# assertion FSB Reflects the value of the FS_B pin sampled on power-up 0 = FSB was low during VTT_PWRGD# assertion FSA Reflects the value of the FS_A pin sampled on power-up 0 = FSA was low during VTT_PWRGD# assertion
2 1 0
HW HW HW
Byte 7: Vendor ID Bit 7 6 5 4 3 2 1 0 @Pup 0 0 1 1 1 0 0 0 Name Revision Code Bit 3 Revision Code Bit 2 Revision Code Bit 1 Revision Code Bit 0 Vendor ID Bit 3 Vendor ID Bit 2 Vendor ID Bit 1 Vendor ID Bit 0 Revision Code Bit 3 Revision Code Bit 2 Revision Code Bit 1 Revision Code Bit 0 Vendor ID Bit 3 Vendor ID Bit 2 Vendor ID Bit 1 Vendor ID Bit 0 Description
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Byte 8: Control Register 7 Bit 7 6 5 4 3 2 1 0 @Pup 0 1 1 1 0 0 0 0 Name Reserved SRC[T/C]10 SRC[T/C]9 SRC[T/C]8 Reserved SRC10 SRC9 SRC8 Reserved set to 0 SRC[T/C]10 Output Enable 0 = Disable (Tri-state), 1 = Enable SRC[T/C]9 Output Enable 0 = Disable (Tri-state), 1 = Enable SRC[T/C]8 Output Enable 0 = Disable (Tri-state), 1 = Enable Reserved set to 0 Allow control of SRC[T/C]10 with assertion of OEA# 0 = Free running, 1 = Stopped with OEA# Allow control of SRC[T/C]9 with assertion of OEB# 0 = Free running, 1 = Stopped with OEB# Allow control of SRC[T/C]8 with assertion of OEA# 0 = Free running, 1 = Stopped with OEA# Description
Byte 9: Control Register 8 Bit 7 6 5 4 3 2 1 0
.
@Pup 0 0 0 0 0 1 1 1
Name PCI3 PCI2 PCI1 PCI0 PCIF0 Reserved Reserved Reserved 33-MHz Output drive strength 0 = Low, 1 = High 33-MHz Output drive strength 0 = Low, 1 = High 33-MHz Output drive strength 0 = Low, 1 = High 33-MHz Output drive strength 0 = Low, 1 = High 33-MHz Output drive strength 0 = Low, 1 = High Reserved set to 1 Reserved set to 1 Reserved set to 1
Description
Crystal Recommendations
Frequency (Fund) 14.31818 MHz Cut AT Loading Load Cap Parallel 20 pF Drive (max.) 0.1 mW . Shunt Cap (max.) 5 pF Motional (max.) 0.016 pF Tolerance (max.) 35 ppm Stability (max.) 30 ppm Aging (max.) 5 ppm
The CY28446 requires a Parallel Resonance Crystal. Substituting a series resonance crystal causes the CY28446 to operate at the wrong frequency and violate the ppm specification. For most applications there is a 300-ppm frequency shift between series and parallel crystals due to incorrect loading
Crystal Loading
Crystal loading plays a critical role in achieving low ppm performance. To realize low ppm performance, use the total capacitance the crystal sees to calculate the appropriate capacitive loading (CL). Figure 1 shows a typical crystal configuration using the two trim capacitors. It is important that the trim capacitors are in series with the crystal. It is not true that load capacitors are in parallel with the crystal and are approximately equal to the load capacitance of the crystal.
Figure 1. Crystal Capacitive Clarification
Calculating Load Capacitors
In addition to the standard external trim capacitors, consider the trace capacitance and pin capacitance to calculate the crystal loading correctly. Again, the capacitance on each side Page 8 of 19
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CY28446
is in series with the crystal. The total capacitance on both side is twice the specified crystal load capacitance (CL). Trim capacitors are calculated to provide equal capacitive loading on both sides.
Clock Chip
CL....................................................Crystal load capacitance CLe......................................... Actual loading seen by crystal using standard value trim capacitors Ce..................................................... External trim capacitors Cs .............................................. Stray capacitance (terraced)
Ci1
Ci2 Pin 3 to 6p
Ci ...........................................................Internal capacitance (lead frame, bond wires etc.) OE# Description
Cs1
X1
X2
Cs2 Trace 2.8 pF
XTAL Ce1
Ce2
Trim 33 pF
The OE# signals are active LOW inputs used for clean enabling and disabling selected SRC outputs. The outputs controlled by OE[A,B]# are determined by the settings in register byte 3 and byte 8. OE[0,1,3,6]# controls SRC[0,1,3,6], respectively. The OE# signal is a debounced signal and its state must remain unchanged during two consecutive rising edges of SRCC to be recognized as a valid assertion or deassertion. (The assertion and deassertion of this signal is absolutely asynchronous.) OE# Assertion (OE# -> LOW) All differential stopped outputs resume normal operation in a glitch-free manner. The maximum latency from the assertion to active outputs is between 2 and 6 SRC clock periods (2 clocks are shown) with all SRC outputs resuming simultaneously. All stopped SRC outputs must be driven HIGH within 10 ns of OE# deassertion to a voltage er than 200 mV. OE# Deassertion (OE# -> HIGH) The impact of deasserting the OE# pins is that all SRC outputs that are set in the control registers to stoppable via deassertion of OE# are stopped after their next transition. The final state of all stopped SRC clocks is Low/low.
Figure 2. Crystal Loading Example Use the following formulas to calculate the trim capacitor values for Ce1 and Ce2. Load Capacitance (each side) Ce = 2 * CL - (Cs + Ci) Total Capacitance (as seen by the crystal) CLe
=
1 1 ( Ce1 + Cs1 + Ci1
+
1 Ce2 + Cs2 + Ci2
)
OE#
SRCT(free running) SRCC(free running) SRCT(stoppable) SRCT(stoppable)
Figure 3. OE# Deassertion/Assertion Waveform
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PD (Power down) Clarification The CKPWRGD/PWRDWN# pin is a dual-function pin. During initial power-up, the pin functions as CKPWRGD. Once CKPWRGD has been sampled HIGH by the clock chip, the pin assumes PD# functionality. The PD# pin is an asynchronous active LOW input used to shut off all clocks cleanly before shutting off power to the device. This signal is synchronized internal to the device before powering down the clock synthesizer. PD# is also an asynchronous input for powering up the system. When PD# is asserted LOW, all clocks need to be driven to a LOW value and held before turning off the VCOs and the crystal oscillator. PD (Power down) Assertion When PD is sampled HIGH by two consecutive rising edges of CPUC, all single-ended outputs will be held LOW on their next HIGH-to-LOW transition and differential clocks must held HIGH or tri-stated (depending on the state of the control register drive mode bit) on the next diff clock# HIGH-to-LOW transition within 4 clock periods. When the SMBus PD drive mode bit corresponding to the differential (CPU, SRC, and DOT) clock output of interest is programmed to `0', the clock output are held with "Diff clock" pin driven HIGH and "Diff clock#" driven LOW. If the control register PD drive mode bit
PD C P U T , 133M H z C P U C , 133M H z S R C T 100M H z S R C C 100M H z U S B , 48M H z D O T 96T D O T 96C
corresponding to the output of interest is programmed to "1", then both the "Diff clock" and the "Diff clock#" are LOW. Figure 4 shows CPUT = 133 MHz and PD drive mode = `1' for all differential outputs. This diagram and description is applicable to valid CPU frequencies 100, 133, 166 and 200 MHz. If PD mode has the initial power-on state, PD must be asserted HIGH in less than 10 s after asserting Vtt_PwrGd#. The 96_100_SSC follows the DOT waveform selected for 96 MHz and the SRC waveform in 100 MHz mode. PD Deassertion The power-up latency is less than 1.8 ms. This is the time from the deassertion of the PD pin or the ramping of the power supply until the time that stable clocks are output from the clock chip. All differential outputs stopped in a three-state condition resulting from power-down will be driven HIGH in less than 300 s of PD deassertion to a voltage greater than 200 mV. After the clock chip's internal PLL is powered up and locked, all outputs will be enabled within a few clock cycles of each other. Figure 5 is an example showing the relationship of clocks coming up. It should be noted that 96_100_SSC will follow the DOT waveform is selected for 96 MHz and the SRC waveform when in 100-MHz mode.
P C I, 3 3 M H z REF
Figure 4. Power down Assertion Timing Waveform
T stable <1.8 ms
PD C P U T, 133M H z C P U C , 133M H z S R C T 100M H z S R C C 100M H z U S B , 48M H z D O T96T D O T96C P C I, 33M H z REF
Tdrive_PW R D N # <300 , >200 mV
Figure 5. Power-down Deassertion Timing Waveform
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CPU_STP# Assertion The CPU_STP# signal is an active LOW input used for synchronous stopping and starting the CPU output clocks while the rest of the clock generator continues to function. When the CPU_STP# pin is asserted, all CPU outputs that are set with the SMBus configuration to be stoppable via assertion of CPU_STP# will be stopped within two to six CPU clock periods after being sampled by two rising edges of the internal CPUC clock. The final state of all stopped CPU clocks is High/Low when driven, Low/Low when tri-stated CPU_STP# Deassertion The deassertion of the CPU_STP# signal will cause all CPU outputs that were stopped to resume normal operation in a synchronous manner, synchronous manner meaning that no short or stretched clock pulses will be produce when the clock resumes. The maximum latency from the deassertion to active outputs is no more than two CPU clock cycles.
CPU_STP# CPUT CPUC CPUT Internal CPUC Internal
Tdrive_CPU_STP#,10 ns > 200 mV
Figure 6. CPU_STP# Deassertion Waveform
1.8 ms CPU_STOP# PD CPUT(Free Running CPUC(Free Running CPUT(Stoppable) CPUC(Stoppable)
DOT96T DOT96C
Figure 7. CPU_STP#= Driven, CPU_PD = Driven, DOT_PD = Driven
CPU_STP#
CPUT
CPUC
Figure 8. CPU_STP# Assertion Waveform
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PCI_STP# Assertion The PCI_STP# signal is an active LOW input used for synchronous stopping and starting the PCI outputs while the rest of the clock generator continues to function. The set-up time for capturing PCI_STP# going LOW is 10 ns (tSU). (See Figure 10.) The PCIF clocks will not be affected by this pin if their corresponding control bit in the SMBus register is set to allow them to be free running.
CPU_STOP# PD CPUT(Free Running) CPUC(Free Running) CPUT(Stoppable) CPUC(Stoppable)
PCI_STP# Deassertion The deassertion of the PCI_STP# signal will cause all PCI and stoppable PCIF clocks to resume running in a synchronous manner within two PCI clock periods after PCI_STP# transitions to a high level.
1.8mS
DOT96T DOT96C
Figure 9. CPU_STP# = Tri-state, CPU_PD = Tri-state, DOT_PD = Tri-state
Tsu
PCI_STP# PCI_F
PCI SRC 100MHz
Figure 10. PCI_STP# Assertion Waveform
Tdrive_SRC
Tsu
PCI_STP# PCI_F
PCI SRC 100MHz
Figure 11. PCI_STP# Deassertion Waveform
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FS_A, FS_B,FS_C VTT_PW RGD# PW RGD_VRM
VDD Clock Gen Clock State State 0
0.2-0.3mS Delay State 1
W ait for VTT_PW RGD#
Sample Sels State 2 State 3
Device is not affected, VTT_PW RGD# is ignored
Clock Outputs
Off
On
Clock VCO
Off
On
Figure 12. VTT_PWRGD# Timing Diagram
S1
S2 VTT_PWRGD# = Low
Delay >0.25mS
VDD_A = 2.0V
Sample Inputs straps
Wait for <1.8ms S0 S3 VDD_A = off
Power Off
Normal Operation
VTT_PWRGD# = toggle
Enable Outputs
Figure 13. Clock Generator Power-up/Run State Diagram
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Absolute Maximum Conditions
Parameter VDD VDD_A VIN TS TA TJ OJC OJA ESDHBM UL-94 MSL Description Core Supply Voltage Analog Supply Voltage Input Voltage Temperature, Storage Temperature, Operating Ambient Temperature, Junction Dissipation, Junction to Case Dissipation, Junction to Ambient ESD Protection (Human Body Model) Flammability Rating Moisture Sensitivity Level Relative to VSS Non-functional Functional Functional Mil-STD-883E Method 1012.1 JEDEC (JESD 51) MIL-STD-883, Method 3015 At 1/8 in. Condition Min. -0.5 -0.5 -0.5 -65 0 - - - 2000 V-0 1 Max. 4.6 4.6 150 85 150 20 60 - Unit V V C C C C/W C/W V
VDD + 0.5 VDC
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.
DC Electrical Specifications
Parameter All VDDs VILI2C VIHI2C VIL_FS VIH_FS VILFS_C VIMFS_C VIHFS_C VIL VIH IIL IIH VOL VOH IOZ IOZL CIN COUT LIN VXIH VXIL IDD3.3V IPD3.3V IPD3.3V Description 3.3V Operating Voltage Input Low Voltage Input High Voltage FS_[A,B] Input Low Voltage FS_[A,B] Input High Voltage FS_C Input Low Voltage FS_C Input Middle Voltage FS_C Input High Voltage 3.3V Input Low Voltage 3.3V Input High Voltage Input Low Leakage Current Input High Leakage Current 3.3V Output Low Voltage 3.3V Output High Voltage High-impedance Output Current High-impedance Output Current Input Pin Capacitance Output Pin Capacitance Pin Inductance Xin High Voltage Xin Low Voltage Dynamic Supply Current Power-down Supply Current Power-down Supply Current At max. load and freq. per Figure 15 PD asserted, Outputs Driven PD asserted, Outputs Tri-state Except internal pull-up resistors, 0 < VIN < VDD Except internal pull-down resistors, 0 < VIN < VDD IOL = 1 mA IOH = -1 mA Single-ended output Differnetial output Typical Typical 3.3 5% SDATA, SCLK SDATA, SCLK Condition Min. 3.135 - 2.2 VSS - 0.3 0.7 VSS - 0.3 0.7 2.0 VSS - 0.3 2.0 -5 - - 2.4 -10 -100 3 3 - 0.7VDD 0 - - - Max. 3.465 1.0 - 0.35 VDD + 0.5 0.35 1.7 VDD + 0.5 0.8 VDD + 0.3 5 5 0.4 - 10 100 5 6 7 VDD 0.3VDD 250 70 5 Unit V V V V V V V V V V A A V V A A pF pF nH V V mA mA mA
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CY28446
AC Electrical Specifications
Parameter Crystal TDC XIN Duty Cycle The device will operate reliably with input duty cycles up to 30/70 but the REF clock duty cycle will not be within specification When XIN is driven from an external clock source Measured between 0.3VDD and 0.7VDD As an average over 1- s duration Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX 47.5 52.5 % Description Condition Min. Max. Unit
TPERIOD TR/TF TCCJ LACC CPU at 0.7V TDC TPERIOD TPERIOD TPERIOD TPERIOD TPERIODSS TPERIODSS TPERIODSS TPERIODSS TPERIODAbs TPERIODAbs TPERIODAbs TPERIODAbs
XIN Period XIN Rise and Fall Times XIN Cycle to Cycle Jitter Long-term Accuracy CPUT and CPUC Duty Cycle 100-MHz CPUT and CPUC Period 133-MHz CPUT and CPUC Period 166-MHz CPUT and CPUC Period 200-MHz CPUT and CPUC Period
69.841 - - - 45 9.997001 7.497751 5.998201 4.998500 9.997001 7.497751 5.998201 4.998500 9.912001 7.412751 5.913201 4.913500 9.912001 7.412751 5.913201 4.913500 - - - - 155 - - -
71.0 10.0 500 300 55 10.00300 7.502251 6.001801 5.001500 10.05327 7.539950 6.031960 5.026634 10.08800 7.587251 6.086801 5.086500 10.13827 7.624950 6.116960 5.111634 100 125 300 150 700 20 125 125 850 - 550
ns ns ps ppm % ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ps ps ppm ps ps % ps ps mV mV mV
100-MHz CPUT and CPUC Period, SSC Measured at crossing point VOX 133-MHz CPUT and CPUC Period, SSC Measured at crossing point VOX 166-MHz CPUT and CPUC Period, SSC Measured at crossing point VOX 200-MHz CPUT and CPUC Period, SSC Measured at crossing point VOX 100-MHz CPUT and CPUC Absolute period 133-MHz CPUT and CPUC Absolute period 166-MHz CPUT and CPUC Absolute period 200-MHz CPUT and CPUC Absolute period Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured from VOL = 0.175 to VOH = 0.525V Determined as a fraction of 2*(TR - TF)/(TR + TF)
TPERIODSSAbs 100-MHz CPUT and CPUC Absolute period, SSC TPERIODSSAbs 133-MHz CPUT and CPUC Absolute period, SSC TPERIODSSAbs 166-MHz CPUT and CPUC Absolute period, SSC TPERIODSSAbs 200-MHz CPUT and CPUC Absolute period, SSC TCCJ TCCJ2 LACC TSKEW2 TR/TF TRFM TR TF VHIGH VLOW VOX CPUT/C Cycle to Cycle Jitter CPU2_ITP Cycle to Cycle Jitter Long-term Accuracy CPU2_ITP to CPU0 Clock Skew CPUT and CPUC Rise and Fall Time Rise/Fall Matching Rise Time Variation Fall Time Variation Voltage High Voltage Low Crossing Point Voltage at 0.7V Swing
Math averages Figure 15 Math averages Figure 15
660 -150 180
Rev 1.0, November 20, 2006
Page 15 of 19
CY28446
AC Electrical Specifications (continued)
Parameter VOVS VUDS VRB SRC at 0.7V TDC TPERIOD TPERIODSS TPERIODAbs SRCT and SRCC Duty Cycle 100-MHz SRCT and SRCC Period 100-MHz SRCT and SRCC Absolute Period Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured from VOL = 0.175 to VOH = 0.525V Determined as a fraction of 2*(TR - TF)/(TR + TF) 45 9.997001 9.997001 9.872001 9.872001 - - - 165 - - - Math averages Figure 15 Math averages Figure 15 660 -150 180 - -0.3 See Figure 15. Measure SE Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured at crossing point VOX Measured from VOL = 0.175 to VOH = 0.525V Determined as a fraction of 2*(TR - TF)/(TR + TF) - 45 10.41354 10.16354 - - 155 - - - Math averages Figure 15 Math averages Figure 15 660 -150 180 - -0.3 55 10.00300 10.05327 10.12800 10.17827 370 125 300 700 20 125 125 850 - 550 VHIGH + 0.3 - 0.2 55 10.41979 10.66979 250 300 700 20 125 125 850 - 550 VHIGH + 0.3 - % ns ns ns ns ps ps ppm ps % ps ps mV mV mV V V V % ns ns ps ppm ps % ps ps mV mV mV V V Description Maximum Overshoot Voltage Minimum Undershoot Voltage Ring Back Voltage See Figure 15. Measure SE Condition Min. - -0.3 - Max. VHIGH + 0.3 - 0.2 Unit V V V
100-MHz SRCT and SRCC Period, SSC Measured at crossing point VOX
TPERIODSSAbs 100-MHz SRCT and SRCC Absolute Period, SSC TSKEW TCCJ LACC TR/TF TRFM TR TF VHIGH VLOW VOX VOVS VUDS VRB DOT96 at 0.7V TDC TPERIOD TPERIODAbs TCCJ LACC TR/TF TRFM TR TF VHIGH VLOW VOX VOVS VUDS DOT96T and DOT96C Duty Cycle DOT96T and DOT96C Period DOT96T/C Cycle to Cycle Jitter DOT96T/C Long Term Accuracy DOT96T and DOT96C Rise and Fall Time Rise/Fall Matching Rise Time Variation Fall Time Variation Voltage High Voltage Low Crossing Point Voltage at 0.7V Swing Maximum Overshoot Voltage Minimum Undershoot Voltage Any SRCT/C to SRCT/C Clock Skew SRCT/C Cycle to Cycle Jitter SRCT/C Long Term Accuracy SRCT and SRCC Rise and Fall Time Rise/Fall Matching Rise TimeVariation Fall Time Variation Voltage High Voltage Low Crossing Point Voltage at 0.7V Swing Maximum Overshoot Voltage Minimum Undershoot Voltage Ring Back Voltage
DOT96T and DOT96C Absolute Period Measured at crossing point VOX
Rev 1.0, November 20, 2006
Page 16 of 19
CY28446
AC Electrical Specifications (continued)
Parameter VRB TDC TPERIOD TPERIODSS TPERIODAbs THIGH TLOW TR/TF TSKEW TCCJ LACC 48_M at 3.3V TDC TPERIOD TPERIODAbs THIGH TLOW TR/TF TCCJ LACC REF at 3.3V TDC TPERIOD TPERIODAbs TR/TF TSKEW TCCJ LACC TSTABLE TSS TSH REF Duty Cycle REF Period REF Absolute Period REF Rising and Falling Edge Rate REF Clock to REF Clock REF Cycle to Cycle Jitter Long Term Accuracy Clock Stabilization from Power-up Stopclock Set-up Time Stopclock Hold Time Measurement at 1.5V Measurement at 1.5V Measurement at 1.5V Measured between 0.8V and 2.0V Measurement at 1.5V Measurement at 1.5V Measurement at 1.5V 45 69.8203 68.82033 1.0 - - - - 10.0 0 55 69.8622 70.86224 4.0 500 1000 300 1.8 - - % ns ns V/ns ps ps ppm ms ns ns Duty Cycle Period Absolute Period 48_M High time 48_M Low time Rising and Falling Edge Rate Cycle to Cycle Jitter 48M Long Term Accuracy Measurement at 1.5V Measurement at 1.5V Measurement at 1.5V Measurement at 2.4V Measurement at 0.4V Measured between 0.8V and 2.0V Measurement at 1.5V Measured at crossing point VOX 45 20.83125 20.48125 8.09 7.694 1.0 - - 55 20.83542 21.18542 11.3 11.3 4.0 350 300 % ns ns ns ns V/ns ps ppm PCI/PCIF at 3.3V PCI Duty Cycle Spread Disabled PCIF/PCI Period Spread Disabled PCIF/PCI Period PCIF and PCI high time PCIF and PCI low time PCIF/PCI rising and falling Edge Rate Any PCI clock to Any PCI clock Skew PCIF and PCI Cycle to Cycle Jitter PCIF/PCI Long Term Accuracy Measurement at 1.5V Measurement at 1.5V Measurement at 1.5V Measurement at 2.4V Measurement at 0.4V Measured between 0.8V and 2.0V Measurement at 1.5V Measurement at 1.5V Measured at crossing point VOX 45 29.99100 29.9910 29.49100 29.49100 12.0 12.0 1.0 - - - 55 30.00900 30.15980 30.50900 30.65980 - - 4.0 500 500 300 % ns ns ns ns ns ns V/ns ps ps ppm Description Ring Back Voltage Condition See Figure 15. Measure SE Min. - Max. 0.2 Unit V
Spread Enabled PCIF/PCI Period, SSC Measurement at 1.5V
TPERIODSSAbs Spread Enabled PCIF/PCI Period, SSC Measurement at 1.5V
ENABLE/DISABLE and SET-UP
Rev 1.0, November 20, 2006
Page 17 of 19
CY28446
Test and Measurement Set-up
For PCI Single-ended Signals and Reference The following diagram shows the test load configuration of single-ended PCI, USB output signals.
5 pF
Figure 14. Single-ended PCI, USB Load Configuration The following diagram shows the test load configuration for the differential CPU and SRC outputs.
CPUT SR CT D O T96T
L1
L2
TPC B
M easurem ent point 2 pF
100 ohm D ifferential C PU C SRC C DTO 96C L1 L2 M easurem ent point
TPCB
2 pF
Figure 15. 0.7V Differential Load Configuration
3 .3 V s ig n a ls
T DC
-
3 .3 V
2 .0 V
1 .5 V
0 .8 V 0V
TR
TF
Figure 16. Single-ended Output Signals (for AC Parameters Measurement)
Rev 1.0, November 20, 2006
Page 18 of 19
CY28446
Ordering Information
Part Number Lead-free Package Type Product Flow
CY28446LFXC CY28446LFXCT
64-pin QFN 64-pin QFN--Tape and Reel
Commercial, 0 to 70 C Commercial, 0 to 70 C
Package Diagram
64-Lead QFN 9 x 9 mm (Punch Version) LF64A
DIMENSIONS IN MM[INCHES] MIN. MAX. REFERENCE JEDEC MO-220 WEIGHT: 0.2 GRAMS
A
8.90[0.350] 9.10[0.358]
0.08[0.003] 1.00[0.039] MAX. 0.05[0.002] MAX.
C
8.70[0.342] 8.80[0.346] N
0.80[0.031] MAX. 0.20[0.008] REF.
0.18[0.007] 0.28[0.011] PIN1 ID 0.20[0.008] R. N 1 2 0.45[0.018]
1 0.80 DIA. 2 3
E-PAD
8.70[0.342] 8.80[0.346] 8.90[0.350] 9.10[0.358]
(PAD SIZE VARY BY DEVICE TYPE)
0.30[0.012] 0.50[0.020]
0-12 0.50[0.020]
0.24[0.009] 0.60[0.024] 7.45[0.293] 7.55[0.297] SEATING PLANE
(4X)
TOP VIEW
C
SIDE VIEW
BOTTOM VIEW
While SLI has reviewed all information herein for accuracy and reliability, Spectra Linear Inc. assumes no responsibility for the use of any circuitry or for the infringement of any patents or other rights of third parties which would result from each use. This product is intended for use in normal commercial applications and is not warranted nor is it intended for use in life support, critical medical instruments, or any other application requiring extended temperature range, high reliability, or any other extraordinary environmental requirements unless pursuant to additional processing by Spectra Linear Inc., and expressed written agreement by Spectra Linear Inc. Spectra Linear Inc. reserves the right to change any circuitry or specification without notice.
Rev 1.0, November 20, 2006
Page 19 of 19

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