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Integrated Circuit Systems, Inc.
ICS951412
System Clock Chip for ATI RS480 K8-based Systems
Recommended Application: ATI RS480 systems using AMD K8 processors Output Features: * 3 - 14.318 MHz REF clocks * 1 - USB_48MHz USB clock * 1 - HyperTransport 66 MHz clock seed * 1 - PCI 33 MHz clock seed * 2 - Pairs of AMD K8 clocks * 6 - Pairs of SRC/PCI Express* clocks * 2 - Pairs of ATIG (SRC/PCI Express) clocks Features: * 2 - Programmable Clock Request pins for SRC clocks * Spread Spectrum for EMI reduction * Outputs may be disabled via SMBus * External crystal load capacitors for maximum frequency accuracy
Pin Configuration
X1 X2 VDD48 USB_48MHz GND NC SCLK SDATA **FS2 **CLKREQA# **CLKREQB# SRCCLKT7 SRCCLKC7 VDDSRC GNDSRC SRCCLKT6 SRCCLKC6 SRCCLKT5 SRCCLKC5 GNDSRC VDDSRC SRCCLKT4 SRCCLKC4 SRCCLKT3 SRCCLKC3 GNDSRC ATIGCLKT1 ATIGCLKC1 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 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 VDDREF GND **FS0/REF0 **FS1/REF1 REF2 VDDPCI PCICLK0 GNDPCI VDDHTT HTTCLK0 GNDHTT CPUCLK8T0 CPUCLK8C0 VDDCPU GNDCPU CPUCLK8T1 CPUCLK8C1 VDDA GNDA IREF GNDSRC VDDSRC SRCCLKT0 SRCCLKC0 VDDATI GNDATI ATIGCLKT0 ATIGCLKC0
Note: Pins preceeded by '**' have a 120 Kohm Internal Pull Down resistor
56 Pin SSOP/TSSOP
Power Groups
Pin Number VDD 56 51 48 43 14, 21, 32,35 39 3 GND 55 49 46 42 15, 20, 26,31,36 38 5 Description Xtal, REF PCICLK output HTTCLK output CPU Outputs SRC outputs Analog, CPU PLL USB_48MHz output
Functionality
FS2 0 0 0 0 1 1 1 FS1 0 0 1 1 0 0 1 FS0 0 1 0 1 0 1 1 CPU MHz Hi-Z X 180.00 220.00 100.00 133.33 200.00 HTT MHz Hi-Z X/3 60.00 73.12 66.66 66.66 66.66 PCI MHz Hi-Z X/6 30.00 36.56 33.33 33.33 33.33
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*Other names and brands may be claimed as the property of others.
ICS951412
ICS951412
Pin Descriptions
PIN # 1 2 3 4 5 6 7 8 9 10 PIN NAME X1 X2 VDD48 USB_48MHz GND NC SCLK SDATA **FS2 **CLKREQA# PIN TYPE IN OUT PWR OUT PWR N/A IN I/O IN IN DESCRIPTION Crystal input, Nominally 14.318MHz. Crystal output, Nominally 14.318MHz Power pin for the 48MHz output.3.3V 48.00MHz USB clock Ground pin. No Connection. Clock pin of SMBus circuitry, 5V tolerant. Data pin for SMBus circuitry, 5V tolerant. Frequency select pin. Output enable for PCI Express (SRC) outputs. SMBus selects which outputs are controlled. 0 = enabled, 1 = tri-stated Output enable for PCI Express (SRC) outputs. SMBus selects which outputs are controlled. 0 = enabled, 1 = tri-stated True clock of differential SRC clock pair. Complement clock of differential SRC clock pair. Supply for SRC clocks, 3.3V nominal Ground pin for the SRC outputs True clock of differential SRC clock pair. Complement clock of differential SRC clock pair. True clock of differential SRC clock pair. Complement clock of differential SRC clock pair. Ground pin for the SRC outputs Supply for SRC clocks, 3.3V nominal True clock of differential SRC clock pair. Complement clock of differential SRC clock pair. True clock of differential SRC clock pair. Complement clock of differential SRC clock pair. Ground pin for the SRC outputs True clock of differential SRC clock pair. Complementary clock of differential SRC clock pair.
11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28
**CLKREQB# SRCCLKT7 SRCCLKC7 VDDSRC GNDSRC SRCCLKT6 SRCCLKC6 SRCCLKT5 SRCCLKC5 GNDSRC VDDSRC SRCCLKT4 SRCCLKC4 SRCCLKT3 SRCCLKC3 GNDSRC ATIGCLKT1 ATIGCLKC1
IN OUT OUT PWR PWR OUT OUT OUT OUT PWR PWR OUT OUT OUT OUT PWR OUT OUT
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Pin Descriptions (Continued)
PIN # 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 PIN NAME ATIGCLKC0 ATIGCLKT0 GNDATI VDDATI SRCCLKC0 SRCCLKT0 VDDSRC GNDSRC IREF GNDA VDDA CPUCLK8C1 CPUCLK8T1 GNDCPU VDDCPU CPUCLK8C0 CPUCLK8T0 GNDHTT HTTCLK0 VDDHTT GNDPCI PCICLK0 VDDPCI REF2 **FS1/REF1 **FS0/REF0 GND VDDREF Type OUT OUT PWR PWR OUT OUT PWR PWR OUT PWR PWR OUT OUT PWR PWR OUT OUT PWR OUT PWR PWR OUT PWR OUT I/O I/O PWR PWR Pin Description Complementary clock of differential SRC clock pair. True clock of differential SRC clock pair. Ground for ATI Gclocks, nominal 3.3V Power supply ATI Gclocks, nominal 3.3V Complement clock of differential SRC clock pair. True clock of differential SRC clock pair. Supply for SRC clocks, 3.3V nominal Ground pin for the SRC outputs This pin establishes the reference current for the differential current-mode output pairs. This pin requires a fixed precision resistor tied to ground in order to establish the appropriate current. 475 ohms is the standard value. Ground pin for the PLL core. 3.3V power for the PLL core. Complementary clock of differential 3.3V push-pull K8 pair. True clock of differential 3.3V push-pull K8 pair. Ground pin for the CPU outputs Supply for CPU clocks, 3.3V nominal Complementary clock of differential 3.3V push-pull K8 pair. True clock of differential 3.3V push-pull K8 pair. Ground pin for the HTT outputs 3.3V Hyper Transport output Supply for HTT clocks, nominal 3.3V. Ground pin for the PCI outputs PCI clock output. Power supply for PCI clocks, nominal 3.3V 14.318 MHz reference clock. Frequency select latch input pin / 14.318 MHz reference clock. Frequency select latch input pin / 14.318 MHz reference clock. Ground pin. Ref, XTAL power supply, nominal 3.3V
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ICS951412
General Description
The ICS951412 is a main clock synthesizer chip that provides all clocks required for ATI RS480-based systems. An SMBus interface allows full control of the device.
Block Diagram
REF(2:0)
X1 X2 XTAL OSC. FIXED PLL DIVIDER
USB_48MHz
PCICLK0 HTTCLK0 SRCCLK(7:3,0) MAIN PLL DIVIDERS ATIGCLK(1:0)
CPUCLK8(1:0)
FS(2:0) CLKREQA# CLKREQB# SEL75#/100 SDATA SCLK
CONTROL LOGIC
IREF
Skew Characteristics
Parameter Tsk_CPU_CPU Tsk_CPU_PCI Tsk_PCI_PCI Tsk_PCI33-HT66 Tsk_CPU_HT66 Tsk_CPU_HT66 Tsk_CPU_CPU Tsk_CPU_PCI Tsk_PCI_PCI Tsk_PCI33-HT66 Tsk_CPU_HT66 Tsk_CPU_HT66
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Description
Test Conditons
measured at x-ing of CPU, measured at x-ing of CPU, 1.5V of PCI clock measured between rising edge at 1.5V measured between rising edge at 1.5V measured between rising edge at 1.5V measured at x-ing of CPU, 1.5V of PCI clock measured at x-ing of CPU, measured at x-ing of CPU, 1.5V of PCI clock measured between rising edge at 1.5V measured between rising edge at 1.5V measured between rising edge at 1.5V measured at x-ing of CPU, 1.5V of PCI clock
Skew Window 250 2000 500 500 2000 500 200 200 200 200 200 200
Unit ps ps ps ps ps ps ps ps ps ps ps ps
time independent skew not dependent on V, T changes
time variant skew varies over V, T changes
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ICS951412
General SMBus serial interface information How to Write:
Controller (host) sends a start bit. Controller (host) sends the write address D2 (H) ICS clock will acknowledge Controller (host) sends the begining byte location = N ICS clock will acknowledge Controller (host) sends the data byte count = X ICS clock will acknowledge Controller (host) starts sending Byte N through Byte N + X -1 (see Note 2) * ICS clock will acknowledge each byte one at a time * Controller (host) sends a Stop bit * * * * * * * *
How to Read:
* * * * * * * * * * * * * * Controller (host) will send start bit. Controller (host) sends the write address D2 (H) ICS clock will acknowledge Controller (host) sends the begining byte location = N ICS clock will acknowledge Controller (host) will send a separate start bit. Controller (host) sends the read address D3 (H) ICS clock will acknowledge ICS clock will send the data byte count = X ICS clock sends Byte N + X -1 ICS clock sends Byte 0 through byte X (if X(H) was written to byte 8). Controller (host) will need to acknowledge each byte Controllor (host) will send a not acknowledge bit Controller (host) will send a stop bit
Index Block Write Operation
Controller (Host) starT bit T Slave Address D2(H) WR WRite Beginning Byte = N ACK Data Byte Count = X ACK Beginning Byte N ACK X Byte ICS (Slave/Receiver)
Index Block Read Operation
Controller (Host) T starT bit Slave Address D2(H) WR WRite Beginning Byte = N ACK RT Repeat starT Slave Address D3(H) RD ReaD ACK Data Byte Count = X ACK Beginning Byte N ACK X Byte ICS (Slave/Receiver)
ACK
ACK
Byte N + X - 1 ACK P stoP bit
Byte N + X - 1 N P
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Not acknowledge stoP bit
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ICS951412
Table1: CPU Frequency Selection Table CPU CPU FS3 CPU CPU CPU CPU SS_EN (B0:b3) FS2 FS1 FS0 (MHz) (B0:b4) 0 0 0 0 0 Hi-Z 0 0 0 0 1 X/6 0 0 0 1 0 180.00 0 0 0 1 1 220.00 0 0 1 0 0 100.00 0 0 1 0 1 133.33 0 0 1 1 0 166.67 0 0 1 1 1 200.00 0 1 0 0 0 186.00 0 1 0 0 1 214.00 0 1 0 1 0 190.00 0 1 0 1 1 210.00 0 1 1 0 0 102.00 0 1 1 0 1 136.00 0 1 1 1 0 170.00 0 1 1 1 1 204.00 1 0 0 0 0 169.58 1 0 0 0 1 229.43 1 0 0 1 0 179.55 1 0 0 1 1 219.45 1 0 1 0 0 99.75 1 0 1 0 1 133.00 1 0 1 1 0 166.25 1 0 1 1 1 199.50 1 1 0 0 0 185.54 1 1 0 0 1 106.73 1 1 0 1 0 189.53 1 1 0 1 1 209.48 1 1 1 0 0 101.75 1 1 1 0 1 135.66 1 1 1 1 0 169.58 1 1 1 1 1 203.49
HTT66 PCI33 (MHz) (MHz) Hi-Z X/12 60.00 73.33 66.67 66.67 66.67 66.67 62.00 71.33 63.33 70.00 68.00 68.00 68.00 68.00 56.53 76.48 59.85 73.15 66.50 66.50 66.50 66.50 61.85 71.16 63.18 69.83 67.83 67.83 67.83 67.83 Hi-Z X/24 30.00 36.67 33.33 33.33 33.33 33.33 31.00 35.67 31.67 35.00 34.00 34.00 34.00 34.00 28.26 38.24 29.93 36.58 33.25 33.25 33.25 33.25 30.92 35.58 31.59 34.91 33.92 33.91 33.92 33.92
Spread % None None None None None None None None None None None None None None None None -0.5% -0.5% -0.5% -0.5% -0.5% -0.5% -0.5% -0.5% -0.5% -0.5% -0.5% -0.5% -0.5% -0.5% -0.5% -0.5%
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ICS951412
Table2: SRC & ATIG Frequency Selection Table Byte 5 Bit4 Bit3 Bit2 Bit1 Bit0 SRC(7:3,0), Spread ATIG(1:0) SRC % SRC SRC SRC SRC (MHz) Spread FS3 FS2 FS1 FS0 Enable 0 0 0 0 0 0 100.00 0 0 0 0 0 1 100.00 0 0 0 0 1 0 100.00 0 0 0 0 1 1 100.00 0 0 0 1 0 0 101.00 0 0 0 1 0 1 101.00 0 0 0 1 1 0 101.00 0 0 0 1 1 1 101.00 0 0 1 0 0 0 102.00 0 0 1 0 0 1 102.00 0 0 1 0 1 0 102.00 0 0 1 0 1 1 102.00 0 0 1 1 0 0 104.00 0 0 1 1 0 1 104.00 0 0 1 1 1 0 104.00 0 0 1 1 1 1 104.00 -0.5% 1 0 0 0 0 99.75 -0.5% 1 0 0 0 1 99.75 -0.5% 1 0 0 1 0 99.75 -0.5% 1 0 0 1 1 99.75 -0.5% 1 0 1 0 0 100.74 -0.5% 1 0 1 0 1 100.74 -0.5% 1 0 1 1 0 100.74 -0.5% 1 0 1 1 1 100.74 -0.5% 1 1 0 0 0 101.74 -0.5% 1 1 0 0 1 101.74 -0.5% 1 1 0 1 0 101.74 -0.5% 1 1 0 1 1 101.74 -0.5% 1 1 1 0 0 103.74 -0.5% 1 1 1 0 1 103.74 -0.5% 1 1 1 1 0 103.74 -0.5% 1 1 1 1 1 103.74
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ICS951412
SMBus Table: Frequency Select Register Pin # Name Control Function Byte 0 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 FS Source CPU SS_EN Reserved CPU FS4 CPU FS3 CPU FS2 CPU FS1 CPU FS0
Type
0 Latched Inputs OFF Reserved
1 SMBus ON Reserved
PWD 0 0 X 0 0 Latched Latched Latched
Latched Input or SMBus RW Frequency Select CPU Spread Enable Reserved Freq Select Bit 4 Freq Select Bit 3 Freq Select Bit 2 Freq Select Bit 1 Freq Select Bit 0 RW RW RW RW RW RW RW
See Table 1: CPU Frequency Selection
Note: Byte 0 Bit 6, Byte 0 Bit 4 and Byte 5 Bit 4 must be set to '1' to fully enable spread. SMBus Table: Output Control Register Pin # Name Control Function Byte 1 PCICLK0 Output Enable 50 Bit 7 47 HTTCLK0 Output Enable Bit 6 USB_48MHz Output Enable 4 Bit 5 54 REF0 Output Enable Bit 4 REF1 Output Enable 53 Bit 3 REF2 Output Enable 52 Bit 2 45,44 CPUCLK8(0) Output Enable Bit 1 CPUCLK8(1) Output Enable 41,40 Bit 0 SMBus Table: CLKREQB# Output Control Register Byte 2 Pin # Name Control Function CLKREQB# Controls 12,13 REQBSRC7 Bit 7 SRC7 CLKREQB# Controls 16,17 REQBSRC6 Bit 6 SRC6 CLKREQB# Controls 18,19 REQBSRC5 Bit 5 SRC5 CLKREQB# Controls 22,23 REQBSRC4 Bit 4 SRC4 CLKREQB# Controls 24,25 REQBSRC3 Bit 3 SRC3 Reserved Reserved Bit 2 Reserved Reserved Bit 1 CLKREQB# Controls 34,33 REQBSRC0 Bit 0 SRC0
Type RW RW RW RW RW RW RW RW
0 Disable Disable Disable Disable Disable Disable Disable Disable
1 Enable Enable Enable Enable Enable Enable Enable Enable
PWD 1 1 1 1 1 1 1 1
Type RW RW RW RW RW RW RW RW
0 Does not control Does not control Does not control Does not control Does not control Reserved Reserved Does not control
1 Controls Controls Controls Controls Controls Reserved Reserved Controls
PWD 0 0 0 0 0 X X 0
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ICS951412
SMBus Table: SRCCLK(7:3,0), CLKREQA# Output Control Register Byte 3 Pin # Name Control Function Type 0 12,13 SRCCLK7 RW Disable Bit 7 Master Output control. RW 16,17 SRCCLK6 Disable Bit 6 Enables or disables 18,19 SRCCLK5 RW Disable Bit 5 output, regardless of 22,23 SRCCLK4 RW Disable Bit 4 CLKREQ# inputs. 24,25 SRCCLK3 RW Disable Bit 3 34,33 SRCCLK0 RW Disable Bit 2 Does not CLKREQA# Controls 24,25 RW REQASRC3 Bit 1 control SRC3 Does not CLKREQA# Controls 34,33 RW REQASRC0 Bit 0 control SRC0 SMBus Table: SRCCLK(3,0), ATIGCLK Output Control Register Pin # Name Control Function Type Byte 4 CLKREQA# Controls RW REQASRC7 12,13 Bit 7 SRC7 CLKREQA# Controls RW REQASRC6 16,17 Bit 6 SRC6 CLKREQA# Controls RW REQASRC5 18,19 Bit 5 SRC5 CLKREQA# Controls RW REQASRC4 22,23 Bit 4 SRC4 Output Enable 27,28 ATIGCLK1 RW Bit 3 These outputs cannot be controlled by CLKREQ# 30,29 ATIGCLK0 RW Bit 2 pins. Reserved Reserved RW Bit 1 USB_48Str 48MHz Strength Control RW 4 Bit 0
1 Enable Enable Enable Enable Enable Enable Controls Controls
PWD 1 1 1 1 1 1 0 0
0 Does not control Does not control Does not control Does not control Disabled Disabled Reserved 1X
1 Controls Controls Controls Controls Enabled Enabled Reserved 2X
PWD 0 0 0 0 1 1 0 0
Note: Do NOT simultaneously select CLKREQA# and CLKREQB# to control an SRC output. Behavior of the device is undefined under these conditions. SMBus Table: Output Drive and ATIG Frequency Control Register Pin # Name Control Function Type Byte 5 0 1 52 REF2Str REF2 Strength Control RW 1X 2X Bit 7 Reserved Reserved RW Reserved Reserved Bit 6 Reserved Reserved RW Reserved Reserved Bit 5 SRC SSEN SRC Spread Enable RW Bit 4 See Table 2: SRCFS3 Freq Select Bit 3 RW Bit 3 SRC Frequency SRCFS2 Freq Select Bit 2 RW Bit 2 Selection SRCFS1 Freq Select Bit 1 RW Bit 1 SRCFS0 Freq Select Bit 0 RW Bit 0
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PWD 0 0 0 0 0 0 0 0
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ICS951412
SMBus Table: Device ID Register Byte 6 Pin # Name DevID 7 Bit 7 DevID 6 Bit 6 DevID 5 Bit 5 DevID 4 Bit 4 DevID 3 Bit 3 DevID 2 Bit 2 DevID 1 Bit 1 DevID 0 Bit 0 SMBus Table: Vendor ID Register Pin # Name Byte 7 RID3 Bit 7 RID2 Bit 6 RID1 Bit 5 RID0 Bit 4 VID3 Bit 3 VID2 Bit 2 VID1 Bit 1 VID0 Bit 0 SMBus Table: Byte Count Register Pin # Name Byte 8 BC7 Bit 7 BC6 Bit 6 BC5 Bit 5 BC4 Bit 4 BC3 Bit 3 BC2 Bit 2 BC1 Bit 1 BC0 Bit 0 Bytes 9 to 21 are reserved
Control Function Device ID MSB Device ID 6 Device ID 5 Device ID4 Device ID3 Device ID2 Device ID1 Device ID LSB
Type R R R R R R R R
0 -
1 -
PWD 0 0 0 1 0 0 1 0
Control Function Revision ID
VENDOR ID (0001 = ICS)
Type R R R R R R R R
0 -
1 -
PWD X X X X 0 0 0 1
Control Function
Byte Count Programming b(7:0)
Type 0 1 RW RW RW Writing to this register RW will configure how many RW bytes will be read back, default is 9 bytes. RW RW RW
PWD 0 0 0 0 1 0 0 1
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ICS951412
Absolute Maximum Ratings
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 3.8V Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . GND -0.5 V to VDD +3.8 V Ambient Operating Temperature . . . . . . . . . . 0C to +70C Storage Temperature . . . . . . . . . . . . . . . . . . . . -65C to +150C ESD Protection . . . . . . . . . . . . . . . . . . . . . . . . Input ESD protection usung human body model > 1KV Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only and functional operation of the device at these or any other conditions above those listed in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.
Electrical Characteristics - Input/Supply/Common Output Parameters
TA = 0 - 70C; Supply Voltage VDD = 3.3 V +/-5% PARAMETER Input High Voltage Input Low Voltage Input High Current SYMBOL VIH VIL IIH IIL1 Input Low Current IIL2 Operating Current Input Frequency3 Pin Inductance1 Input Capacitance1 Clk Stabilization1,2 Modulation Frequency SMBus Voltage Low-level Output Voltage Current sinking at VOL = 0.4 V SCLK/SDATA Clock/Data Rise Time3 SCLK/SDATA Clock/Data Fall Time3
1 2
CONDITIONS 3.3 V +/-5% 3.3 V +/-5% VIN = VDD VIN = 0 V; Inputs with no pull-up resistors VIN = 0 V; Inputs with pull-up resistors all outputs driven VDD = 3.3 V Logic Inputs Output pin capacitance X1 & X2 pins From VDD Power-Up or de-assertion of PD# to 1st clock Triangular Modulation @ IPULLUP
MIN 2 VSS - 0.3 -5 -5 -200
TYP
MAX VDD + 0.3 0.8 5
UNITS NOTES V V uA uA uA 1 1 1 1 1
IDD3.3OP Fi Lpin CIN COUT CINX TSTAB VDD VOL IPULLUP TRI2C TFI2C
300 14.31818 7 5 6 5 3 30 2.7 4 33 5.5 0.4
mA MHz nH pF pF pF ms kHz V V mA ns ns
3 1 1 1 1 1,2 1 1 1 1 1 1
(Max VIL - 0.15) to (Min VIH + 0.15) (Min VIH + 0.15) to (Max VIL - 0.15)
1000 300
Guaranteed by design and characterization, not 100% tested in production. See timing diagrams for timing requirements. 3 Input frequency should be measured at the REFOUT pin and tuned to ideal 14.31818MHz to meet ppm frequency accuracy on PLL outputs.
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ICS951412
Electrical Characteristics - K8 Push Pull Differential Pair
TA = 0 - 70C; VDD = 3.3 V +/-5%; CL =AMD64 Processor Test Load PARAMETER Rising Edge Rate Falling Edge Rate Differential Voltage Change in VDIFF_DC Magnitude Common Mode Voltage Change in Common Mode Voltage Jitter, Cycle to cycle SYMBOL V/t V/t VDIFF VDIFF VCM VCM Measurement from differential wavefrom. Maximum difference of cycle time between 2 adjacent cycles. Measured at the AMD64 processor's test load. (single-ended measurement) CONDITIONS Measured at the AMD64 processor's test load. 0 V +/- 400 mV (differential measurement) MIN TYP MAX UNITS NOTES 2 2 0.4 -150 10 10 1.25 2.3 150 V/ns V/ns V mV V mV 1 1 1 1 1 1
1.05 1.25 1.45 -200 200
tjcyc-cyc
0
100 200
ps
1
Measured using the JIT2 software package with a Tek 7404 scope. TIE (Time Interval Error) measurement tja -1000 1000 Jitter, Accumulated technique: Sample resolution = 50 ps, Sample Duration = 10 s Measurement from differential dt3 Duty Cycle 45 53 wavefrom Average value during switching RON 35 55 Output Impedance transition. Used for determining series 15 termination value. Measurement from differential tsrc-skew 250 Group Skew wavefrom 1 Guaranteed by design and characterization, not 100% tested in production. 2 All accumulated jitter specifications are guaranteed assuming that REF is at 14.31818MHz 3 Spread Spectrum is off
1,2,3
% ps
1 1 1
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ICS951412
Electrical Characteristics - SRC 0.7V Current Mode Differential Pair
TA = 0 - 70C; VDD = 3.3 V +/-5%; CL =2pF, RS=33.2, RP=49.9, REF = 475 PARAMETER Current Source Output Impedance Voltage High Voltage Low Max Voltage Min Voltage SYMBOL Zo VHigh VLow Vovs Vuds CONDITIONS VO = Vx Statistical measurement on single ended signal using oscilloscope math function. Measurement on single ended signal using absolute value. MIN 3000 660 -150 -300 250 Variation of crossing over all edges see Tperiod min-max values 75.00 MHz nominal 75.00 MHz spread 100.00 MHz nominal 100.00 MHz spread 116.67 MHz nominal 116.67 MHz spread 133.33 MHz nominal 133.33 MHz spread @100.00MHz nominal/spread VOL = 0.175V, VOH = 0.525V VOH = 0.525V VOL = 0.175V 350 12 -300 8.5684 8.5684 9.9970 9.9970 13.3303 13.3303 7.4972 7.4972 9.8720 175 175 8.5714 550 140 850 mV 150 1150 mV mV mV ppm ns ns ns ns ns ns ns ns ns ps ps ps ps 1,3 1 1 1 1 1,2 2 2 2 2 2 2 2 2 1,2 1 1 1 1 TYP MAX UNITS NOTES 1 1,3
Crossing Voltage (abs) Vcross(abs) Crossing Voltage (var) Long Accuracy d-Vcross ppm
Average period
Tperiod
300 8.5744 8.6244 10.0000 10.0030 10.0530 13.3333 13.3363 13.3863 7.5002 7.5032 7.5532 700 700 125 125
Absolute min period Rise Time Fall Time Rise Time Variation Fall Time Variation Duty Cycle
Tabsmin tr tf d-tr d-tf dt3
30 30
Measurement from differential 45 55 % 1 wavefrom Measurement from differential tsrc-skew Group Skew 250 ps wavefrom Measurement from differential tjcyc-cyc Jitter, Cycle to cycle 100 ps 1 wavefrom 1 Guaranteed by design and characterization, not 100% tested in production. 2 All Long Term Accuracy and Clock Period specifications are guaranteed assuming that REF is at 14.31818MHz 3 IREF = VDD/(3xRR). For RR = 475 (1%), IREF = 2.32mA. IOH = 6 x IREF and VOH = 0.7V @ ZO=50.
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ICS951412
Electrical Characteristics - PCI33, HTT66 Clocks
TA = 0 - 70C; VDD=3.3V +/-5%; CL = 30 pF (unless otherwise specified) PARAMETER Long Accuracy PCI33 Clock period HTT66 Clock period Output High Voltage Output Low Voltage Output High Current Output Low Current Edge Rate Edge Rate Rise Time Fall Time Duty Cycle Skew Jitter, Cycle to cycle
1 2
SYMBOL ppm Tperiod Tperiod VOH VOL IOH IOL V/t V/t tr1 tf1 dt1 tsk1 tjcyc-cyc
CONDITIONS see Tperiod min-max values 33.33MHz output nominal 33.33MHz output spread 66.67MHz output nominal 66.67MHz output spread IOH = -1 mA IOL = 1 mA V OH @MIN = 1.0 V VOH@ MAX = 3.135 V VOL @ MIN = 1.95 V VOL @ MAX = 0.4 V Rising edge rate Falling edge rate VOL = 0.4 V, VOH = 2.4 V VOH = 2.4 V, VOL = 0.4 V VT = 1.5 V VT = 1.5 V VT = 1.5 V
MIN -300 29.9910 29.9910 14.9955 14.9955 2.4 -33 -50 47 58 1 1 0.5 0.5 45
TYP
MAX 300 30.0090 30.1598 15.0045 15.0799 0.55 -46 -80 64 91 4 4 2 2 55 500 180
UNITS NOTES ppm ns ns ns ns V V mA mA mA mA V/ns V/ns ns ns % ps ps 1,2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 1 1 1
Guaranteed by design and characterization, not 100% tested in production. All Long Term Accuracy and Clock Period specifications are guaranteed with the assumption that REF is at 14.31818MHz
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ICS951412
Electrical Characteristics - 48MHz, USB
TA = 0 - 70C; VDD = 3.3 V +/-5%; CL = 10-20 pF (unless otherwise specified) PARAMETER Long Accuracy Clock period Output High Voltage Output Low Voltage Output High Current Output Low Current Edge Rate Edge Rate Rise Time Fall Time Duty Cycle Jitter, Cycle to cycle
1 2
SYMBOL ppm Tperiod VOH VOL IOH IOL V/t V/t tr1 tf1 dt1 tjcyc-cyc
CONDITIONS see Tperiod min-max values 48.00MHz output nominal IOH = -1 mA IOL = 1 mA V OH @ MIN = 1.0 V VOH@ MAX = 3.135 V VOL @MIN = 1.95 V VOL @ MAX = 0.4 V Rising edge rate Falling edge rate VOL = 0.4 V, VOH = 2.4 V VOH = 2.4 V, VOL = 0.4 V VT = 1.5 V VT = 1.5 V
MIN -200 20.8257 2.4 -33 -50 47 58 1 1 1 1 45
TYP
MAX 200 20.8340 0.55 -46 -80 64 91 2 2
UNITS ppm ns V V mA mA mA mA V/ns V/ns ns ns % ps
Notes 1,2 2 1 1 1 1 1 1 1 1 1 1 1 1
1.43 1.33 48
2 2 55 180
Guaranteed by design and characterization, not 100% tested in production. All Long Term Accuracy and Clock Period specifications are guaranteed with the assumption that REF is at 14.31818MHz
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ICS951412
Electrical Characteristics - REF-14.318MHz
TA = 0 - 70C; VDD = 3.3 V +/-5%; CL = 10-20 pF (unless otherwise specified) PARAMETER Long Accuracy Clock period Output High Voltage Output Low Voltage Output High Current Output Low Current Edge Rate Edge Rate Rise Time Fall Time Skew Duty Cycle Jitter, Cycle to cycle
1 2
SYMBOL ppm Tperiod VOH VOL IOH IOL V/t V/t tr1 tf1 tsk1 dt1 tjcyc-cyc
CONDITIONS see Tperiod min-max values 14.318MHz output nominal IOH = -1 mA IOL = 1 mA V OH @MIN = 1.0 V V OH@MAX = 3.135 V V OL @MIN = 1.95 V V OL @MAX = 0.4 V Rising edge rate Falling edge rate VOL = 0.4 V, VOH = 2.4 V VOH = 2.4 V, VOL = 0.4 V VT = 1.5 V VT = 1.5 V VT = 1.5 V
MIN -300 69.8270 2.4
TYP
MAX 300 69.8550 0.4
UNITS NOTES ppm ns V V mA mA mA mA V/ns V/ns ns ns ps % ps 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1
-29 -45 39 49 1 1 1 1 45
-41 -71 54 77 4 4 2 2 500 55 700
Guaranteed by design and characterization, not 100% tested in production. All Long Term Accuracy and Clock Period specifications are guaranteed with the assumption that REF is at 14.31818MHz
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ICS951412
SRC Reference Clock Common Recommendations for Differential Routing Dimension or Value L1 length, Route as non -coupled 50 ohm trace. 0.5 max L2 length, Route as non -coupled 50 ohm trace. 0.2 max L3 length, Route as non -coupled 50 ohm trace. 0.2 max Rs 33 Rt 49.9 Down Device Differential Routing L4 length, Route as coupled microstrip 100 ohm differential trace. L4 length, Route as coup led stripline 100 ohm differential trace. Differential Routing to PCI Express Connector L4 length, Route as coupled microstrip 100 ohm differential trace. L4 length, Rout e as coupled stripline 100 ohm differential trace. Dimension or Value 2 min to 16 max 1.8 min to 14.4 max
Unit inch inch inch ohm ohm Unit inch inch
Figure 2, 3 2, 3 2, 3 2, 3 2, 3 Figure 2 2
Dimension or Value 0.25 to 14 max 0.225 min to 12.6 max
Unit inch inch
Figure 3 3
L1 Rs L1'
L2 L4 L2' Rs Rt Rt PCI Ex REF_CLK Test Load L4'
Fig.1
HSCL Output Buffer
L3'
L3
L1 Rs L1'
L2 L4 L2' Rs Rt Rt PCI Ex Board Down Device REF_CLK Input L4'
Fig.2
HSCL Output Buffer
L3'
L3
L1 Rs L1'
L2 L4 L4' L2' Rs Rt Rt PCI Ex Add In Board REF_CLK Input
Fig.3
HSCL Output Buffer
L3'
L3
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ICS951412
Shared Pin Operation Input/Output Pins
The I/O pins designated by (input/output) on the ICS951412 serve as dual signal functions to the device. During initial power-up, they act as input pins. The logic level (voltage) that is present on these pins at this time is read and stored into a 5-bit internal data latch. At the end of PowerOn reset, (see AC characteristics for timing values), the device changes the mode of operations for these pins to an output function. In this mode the pins produce the specified buffered clocks to external loads. To program (load) the internal configuration register for these pins, a resistor is connected to either the VDD (logic 1) power supply or the GND (logic 0) voltage potential. A 10 Kilohm (10K) resistor is used to provide both the solid CMOS programming voltage needed during the power-up programming period and to provide an insignificant load on the output clock during the subsequent operating period. Figure 1 shows a means of implementing this function when a switch or 2 pin header is used. With no jumper is installed the pin will be pulled high. With the jumper in place the pin will be pulled low. If programmability is not necessary, than only a single resistor is necessary. The programming resistors should be located close to the series termination resistor to minimize the current loop area. It is more important to locate the series termination resistor close to the driver than the programming resistor.
Programming Header Via to Gnd Device Pad
Via to VDD 2K W
8.2K W Clock trace to load Series Term. Res.
Fig. 1
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ICS951412
N
c
56-Lead, 300 mil Body, 25 mil, SSOP SYMBOL
L
INDEX AREA
E1
E
12 D h x 45
A A1 b c D E E1 e h L N a VARIATIONS N
In Millimeters COMMON DIMENSIONS MIN MAX 2.41 2.80 0.20 0.40 0.20 0.34 0.13 0.25 SEE VARIATIONS 10.03 10.68 7.40 7.60 0.635 BASIC 0.38 0.64 0.50 1.02 SEE VARIATIONS 0 8
In Inches COMMON DIMENSIONS MIN MAX .095 .110 .008 .016 .008 .0135 .005 .010 SEE VARIATIONS .395 .420 .291 .299 0.025 BASIC .015 .025 .020 .040 SEE VARIATIONS 0 8
A A1
D mm. MIN 18.31 MAX 18.55 MIN .720
D (inch) MAX .730
-Ce
b SEATING PLANE .10 (.004) C
56
Reference Doc.: JEDEC Publication 95, MO-118
10-0034
Ordering Information
ICS951412yFLFT
Example:
ICS XXXX y F - LF T
Designation for tape and reel packaging Annealed Lead Free (optional) Package Type F = SSOP
Revision Designator (will not correlate with datasheet revision)
Device Type (consists of 3 or 4 digit numbers) Prefix ICS, AV = Standard Device
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ICS951412
N
c
L
INDEX AREA
E1
E
12 D
a
A2 A1
A
56-Lead 6.10 mm. Body, 0.50 mm. Pitch TSSOP (240 mil) (20 mil) In Millimeters In Inches SYMBOL COMMON DIMENSIONS COMMON DIMENSIONS MIN MAX MIN MAX A -1.20 -.047 A1 0.05 0.15 .002 .006 A2 0.80 1.05 .032 .041 b 0.17 0.27 .007 .011 c 0.09 0.20 .0035 .008 SEE VARIATIONS SEE VARIATIONS D 8.10 BASIC 0.319 BASIC E E1 6.00 6.20 .236 .244 0.50 BASIC 0.020 BASIC e L 0.45 0.75 .018 .030 SEE VARIATIONS SEE VARIATIONS N a 0 8 0 8 aaa -0.10 -.004 VARIATIONS
-Ce
b SEATING PLANE
N 56
10-0039
D mm. MIN 13.90 MAX 14.10 MIN .547
D (inch) MAX .555
Reference Doc.: JEDEC Publication 95, MO-153
aaa C
Ordering Information
ICS951412yGLFT
Example:
ICS XXXX y G - LF T
Designation for tape and reel packaging Annealed Lead Free (optional) Package Type G = TSSOP
Revision Designator (will not correlate with datasheet revision)
Device Type (consists of 3 or 4 digit numbers) Prefix ICS, AV = Standard Device
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ICS951412
Revision History
Rev. J K Issue Date Description 1. 4/21/2005 2. 1. 4/29/2005 2. Updated the Electrical Characteristics for HTT. Updated Ordering Information from "Lead Free" to "Annealed Lead Free". Updated the Electrical Characteristics for REF and USB. Updated Pin Description. Pins 10,11. Page # 14,19-20 2,15,16
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