ICS951901 Integrated Circuit Systems, Inc. Programmable Frequency Generator & Integrated Buffers for Pentium III Processor Block Diagram 48MHz 24_48MHz /2 XTAL OSC PLL1 Spread Spectrum SDATA SCLK FS(3:0) PD# PCI_STOP# CPU_STOP# SDRAM_STOP# MODE AGP_SEL 0670B—07/15/04 Control Logic 2 CPU DIVDER Stop SDRAM DIVDER Stop PCI DIVDER Stop 3 13 5 REF(1:0) CPUCLK (2:0) SDRAM (12:0) PCICLK (4:0) PCICLK_F AGP DIVDER Config. Reg. VDDA *(AGPSEL)REF0 1 *(FS3)REF1 GND X1 X2 VDDPCI *(FS1)PCICLK_F *(FS2)PCICLK0 PCICLK1 PCICLK2 PCICLK3 PCICLK4 GND VDDAGP AGPCLK0 AGPCLK1 GND GND *(FS0)48MHz *(MODE)24_48MHz VDD48 SDATA SCLK 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 VDDL CPUCLK0 CPUCLK1 CPUCLK2 GND VDDSDR SDRAM0 SDRAM1 SDRAM2 GND SDRAM3 SDRAM4 SDRAM5 VDDSDR SDRAM6 SDRAM7 GND SDRAM8/PD# SDRAM9/SDRAM_STOP# GND SDRAM10/PCI_STOP# SDRAM11/CPU_STOP# SDRAM12 VDDSDR 48-Pin 300mil SSOP * These inputs have a 120K pull down to GND. 1 These are double strength. Functionality PLL2 X1 X2 Pin Configuration ICS951901 Recommended Application: Single chip clock solution for IA platform. Output Features: • 3 - CPU @ 2.5V • 13 - SDRAM @ 3.3V • 6 - PCI @3.3V, • 2 - AGP @ 3.3V • 1 - 48MHz, @3.3V fixed. • 1 - 24/48MHz, @3.3V selectable by I2C (Default is 24MHz) • 2 - REF @3.3V, 14.318MHz. Features: • Programmable ouput frequency. • Programmable ouput rise/fall time. • Programmable SDRAM and CPU skew. • Spread spectrum for EMI control typically by 7dB to 8dB, with programmable spread percentage. • Watchdog timer technology to reset system if over-clocking causes malfunction. • Uses external 14.318MHz crystal. • FS pins for frequency select Skew Specifications: • CPU - CPU: < 175ps • SDRAM - SDRAM < 250ps (except SDRAM12) • PCI - PCI: < 500ps • CPU (early) - PCI: 1-4ns (typ. 2ns) 2 AGP (1:0) Bit2 FS3 Bit7 FS2 Bit6 FS1 Bit5 FS0 Bit4 CPU MHz SDRAM MHz PCI MHz AGP1 SEL=1 AGP0 SEL=0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 66.67 66.67 66.67 75.00 83.31 90.00 95.00 100.00 100.00 100.00 105.00 112.00 117.99 124.09 133.34 133.34 66.67 100.00 133.34 75.00 83.31 90.00 95.00 66.67 100.00 133.34 105.00 112.00 117.99 124.09 100.00 133.34 33.33 33.33 33.33 37.50 33.32 30.00 31.67 33.33 33.33 33.33 35.00 33.60 35.40 31.02 33.33 33.33 66.67 66.67 66.67 75.00 66.64 60.00 63.33 66.67 66.67 66.67 70.00 67.20 70.80 62.05 66.67 66.67 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 ICS951901 Power Groups General Description Analog VDDA = X1, X2, Core, PLL VDD48 = 48MHz, 24MHz, fixed PLL Digital VDDPCI = PCICLK_F, PCICLK VDDSDR = SDRAM VDDAGP=AGP, REF The ICS951901 is a single chip clock solution for desktop designs using 630S chipsets. It provides all necessary clock signals for such a system. The ICS951901 belongs to ICS new generation of programmable system clock generators. It employs serial programming I2C interface as a vehicle for changing output functions, changing output frequency, configuring output strength, configuring output to output skew, changing spread spectrum amount, changing group divider ratio and dis/enabling individual clocks. This device also has ICS propriety 'Watchdog Timer' technology which will reset the frequency to a safe setting if the system becomes unstable from over clocking. MODE Pin Power Management Control Input M ODE Pin 21 Pin 27 Pin 28 Pin 30 Pin 31 0 SDRAM11 SDRAM10 SDRAM9 SDRAM8 1 CPU_STOP# PCI_STOP# SDRAM_STOP# PD# Pin Configuration PIN NUMBER 1, 7, 15, 22, 25, 35, 43 2 3 4, 14, 18, 19, 29, 32, 39, 44 5 6 8 9 13, 12, 11, 10 17, 16, 20 21 23 24 27 28 30 31 26 33, 34, 36, 37, 38, 40, 41, 42 45, 46, 47 48 PIN NAME TYPE VDD PWR AGPSEL REF0 FS3 REF1 IN OUT IN OUT DESCRIPTION 3.3V Power supply for SDRAM output buffers, PCI output buffers, reference output buffers and 48MHz output AGP frequency select pin. 14.318 MHz reference clock. Frequency select pin. 14.318 MHz reference clock. GND PWR Ground pin for 3V outputs. X1 X2 FS1 PCICLK_F FS2 PCICLK0 PCICLK (4:1) AGP (1:0) FS0 48MHz IN OUT IN OUT IN OUT OUT OUT IN OUT Crystal input,nominally 14.318MHz. Crystal output, nominally 14.318MHz. Frequency select pin. PCI clock output, not affected by PCI_STOP# Frequency select pin. PCI clock output. PCI clock outputs. AGP outputs defined as 2X PCI. These may not be stopped. Frequency select pin. 48MHz output clock Pin 27, 28, 30, & 31 function select pin 0=Desktop 1=Mobile mode Clock output for super I/O/USB default is 24MHz MODE IN 24_48MHz OUT SDATA SCLK I/O IN Data pin for I2C circuitry 5V tolerant SDRAM8 OUT Clock pin of I2C circuitry 5V tolerant Stops all PCICLKs besides the PCICLK_F clocks at logic 0 level, when input is low and MODE pin is in Mobile mode SDRAM clock output Stops all CPUCLKs clocks at logic 0 level, when input is low and MODE pin is in Mobile mode SDRAM clock output SDRAM clock output Stops all SDRAM clocks at logic 0 level, when input is low and MODE pin is in Mobile mode Asynchronous active low input pin used to power down the device into a low power state. The internal clocks are disabled and the VCO and the crystal are stopped. The latency of the power down will not be greater than 3ms SDRAM clock output SDRAM (12, 7:0) OUT SDRAM clock outputs CPUCLK (2:0) VDDL OUT PWR CPU clock outputs. Power pin for the CPUCLKs. 2.5V CPU_STOP# IN SDRAM11 OUT PCI_STOP# IN SDRAM10 SDRAM9 OUT OUT SDRAM_STOP# IN PD# IN 0670B—07/15/04 2 ICS951901 Serial Configuration Command Bitmap Byte0: Functionality and Frequency Select Register (default = 0) Bit Bit 2 Bit 7:4 Bit 3 Bit 1 Bit 0 Bit2 FS3 Bit7 FS2 Bit6 FS1 Bit5 FS0 Bit4 CPU MHz 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 66.67 66.67 66.67 75.00 83.31 90.00 95.00 100.00 100.00 100.00 105.00 112.00 117.99 124.09 133.34 133.34 75.00 75.00 75.00 83.31 83.32 90.00 90.00 95.00 95.00 105.00 105.00 112.00 117.99 124.09 129.99 140.00 Description SDRAM PCI MHz MHz AGP1 SEL=1 AGP0 SEL=0 66.67 100.00 133.34 75.00 83.31 90.00 95.00 66.67 100.00 133.34 105.00 112.00 117.99 124.09 100.00 133.34 100.00 112.50 150.00 111.07 166.65 60.00 120.00 63.33 126.66 70.00 140.00 84.00 88.49 93.07 97.49 105.00 66.67 66.67 66.67 75.00 66.64 60.00 63.33 66.67 66.67 66.67 70.00 67.20 70.80 62.05 66.67 66.67 75.00 64.29 64.29 66.64 62.49 60.00 60.00 63.33 63.33 70.00 70.00 67.20 70.80 62.05 64.99 70.00 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 33.33 33.33 33.33 37.50 33.32 30.00 31.67 33.33 33.33 33.33 35.00 33.60 35.40 31.02 33.33 33.33 37.50 32.14 32.14 33.32 31.25 30.00 30.00 31.67 31.67 35.00 35.00 33.60 35.40 31.02 32.50 35.00 Spread % ± ± ± ± ± ± ± ± 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% center spread center spread center spread center spread center spread center spread center spread center spread ± ± ± ± ± ± ± ± 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% center spread center spread center spread center spread center spread center spread center spread center spread ± ± ± ± ± ± ± ± 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% center spread center spread center spread center spread center spread center spread center spread center spread ± ± ± ± ± ± ± ± 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% 0.35% center spread center spread center spread center spread center spread center spread center spread center spread 0 - Frequency is selected by hardware select, Latched inputs 1 - Frequency is selected by Bit, 2 7:4 0 - Normal 1 - Spread Spectrum Enabled 0 - Running 1 - Tristate all outputs PWD 00000 Note1 0 1 0 Note1: Default at power-up will be for latched logic inputs to define frequency, as displayed by Bit 3. Note: PWD = Power-Up Default I2C is a trademark of Philips Corporation 0670B—07/15/04 3 ICS951901 Byte 2: PCI, Active/Inactive Register (1= enable, 0 = disable) Byte 1: CPU, Active/Inactive Register (1= enable, 0 = disable) BIT PIN# PWD Bit 7 - 1 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 47 46 45 - 1 1 1 1 1 1 1 BIT Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 DESCRIPTION Sel24_48 (1:24MHz, 0:48MHz) R e s e r ve d R e s e r ve d R e s e r ve d CPUCLK0 CPUCLK1 CPUCLK2 R e s e r ve d PIN# 33 34 36 37 38 40 41 42 PWD 1 1 1 1 1 1 1 1 BIT PIN# PWD Bit 7 1 Bit 6 21 1 Bit 5 20 1 Bit 4 26 1 Bit 3 27 1 Bit 2 28 1 Bit 1 30 1 Bit 0 31 1 DESCRIPTION SDRAM7 SDRAM6 SDRAM5 SDRAM4 SDRAM3 SDRAM2 SDRAM1 SDRAM0 Byte 5: AGP, Active/Inactive Register (1= enable, 0 = disable) BIT PIN# PWD Bit 7 X Bit 6 X Bit 5 X Bit 4 X Bit 3 3 1 Bit 2 2 1 Bit 1 17 1 Bit 0 16 1 PWD 1 1 1 1 1 1 1 1 DESCRIPTION R e s e r ve d R e s e r ve d PCICLK4 PCICLK3 PCICLK2 PCICLK1 PCICLK0 PCICLK_F Byte 4: SDRAM , Active/Inactive Register (1= enable, 0 = disable) Byte 3: SDRAM, Active/Inactive Register (1= enable, 0 = disable) BIT Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 PIN# 13 12 11 10 9 8 DESCRIPTION FS3 (Readback) FS2 (Readback) FS1 (Readback) FS0 (Readback) REF0 REF1 AGPCLK1 AGPCLK0 Notes: 1. Inactive means outputs are held LOW and are disabled from switching. 2. Latched Frequency Selects (FS#) will be inverted logic load of the input frequency select pin conditions. 0670B—07/15/04 4 DESCRIPTION R e s e r ve d 24_48MHz 48MHz SDRAM12 SDRAM11 SDRAM10 SDRAM9 SDRAM8 ICS951901 Byte 6: Control , Active/Inactive Register (1= enable, 0 = disable) BIT Bit7 PIN# 2,3 Bit6 45 Bit5 Bit4 Bit3 Bit2 Bit1 - Bit0 - PWD DESCRIPTION 0 REF strength 0=1X, 1=2X CPUCLK2 - Stop - Control 0 0 = C P U _ S TO P # w i l l c o n t r o l C P U C L K 2 , 1=CPUCLK2 is free running even if CPU_STOP# is low X AGPSEL (Readback) X MODE (Readback) X C P U _ S TO P # ( R e a d b a c k ) X P C I _ S TO P # ( R e a d b a c k ) X S D R A M _ S TO P # ( R e a d b a c k ) AGP Speed Toggle 0 0=AGPSEL (pin2) will be determined by latch input setting, 1=AGPSEL will be opposite of latch input setting Byte 8: Byte Count and Read Back Register (1= enable, 0 = disable) Byte 7: Vendor ID Register (1= enable, 0 = disable) BIT PIN# PWD Bit 7 0 Bit 6 0 Bit 5 1 Bit 4 0 Bit 3 1 Bit 2 0 Bit 1 0 Bit 0 1 DESCRIPTION Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved BIT PIN# PWD Bit 7 0 Bit 6 0 Bit 5 0 Bit 4 0 Bit 3 0 Bit 2 1 Bit 1 0 Bit 0 0 Byte 10: VCO Control Selection Bit & Watchdog Timer Control Register Byte 9: Watchdog Timer Count Register Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 PWD 0 0 0 1 0 0 0 0 DESCRIPTION Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Description The decimal representation of these 8 bits correspond to 290ms or 1ms the watchdog timer will wait before it goes to alarm mode and reset the frequency to the safe setting. Default at power up is 16X 290ms = 4.6 seconds. PWD 0 0 0 0 0 0 0 0 Description 0=Hw/B0 freq / 1=B11 & 12 freq WD Enable 0=disable / 1=enable WD Status 0=normal / 1=alarm WD Safe Frequency, Byte 0 bit 2 WD Safe Frequency, FS3 WD Safe Frequency, FS2 WD Safe Frequency, FS1 WD Safe Frequency, FS0 Note: FS values in bit [0:4] will correspond to Byte 0 FS values. Default safe frequency is same as 00000 entry in byte0. 0670B—07/15/04 5 ICS951901 Byte 12: VCO Frequency Control Register Byte 11: VCO Frequency Control Register Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 PWD X X X X X X X X Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Description VCO Divider Bit0 REF Divider Bit6 REF Divider Bit5 REF Divider Bit4 REF Divider Bit3 REF Divider Bit2 REF Divider Bit1 REF Divider Bit0 Notes: 1. PWD = Power on Default Byte 13: Spread Sectrum Control Register PWD X X X X X X X X Description VCO Divider Bit8 VCO Divider Bit7 VCO Divider Bit6 VCO Divider Bit5 VCO Divider Bit4 VCO Divider Bit3 VCO Divider Bit2 VCO Divider Bit1 Note: The decimal representation of these 9 bits (Byte 12 bit [7:0] & Byte 11 bit [7] ) + 8 is equal to the VCO divider value. For example if VCO divider value of 36 is desired, user need to program 36 - 8 = 28, namely, 0, 00011100 into byte 12 bit & byte 11 bit 7. Note: The decimal representation of these 7 bits (Byte 11 [6:0]) + 2 is equal to the REF divider value . Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 PWD X X X X X X X X Byte 14: Description Spread Spectrum Bit7 Spread Spectrum Bit6 Spread Spectrum Bit5 Spread Spectrum Bit4 Spread Spectrum Bit3 Spread Spectrum Bit2 Spread Spectrum Bit1 Spread Spectrum Bit0 Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Spread Sectrum Control Register PWD X X X X X X X X Description Reserved Reserved Reserved Spread Spectrum Bit12 Spread Spectrum Bit11 Spread Spectrum Bit10 Spread Spectrum Bi 9 Spread Spectrum Bit8 Note: Please utilize software utility provided by ICS Application Engineering to configure spread spectrum. Incorrect spread percentage may cause system failure. Note: Please utilize software utility provided by ICS Application Engineering to configure spread spectrum. Incorrect spread percentage may cause system failure. Byte 15: Output Skew Control Byte 16: Output Skew Control Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 PWD 1 0 0 1 1 1 1 0 Description Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 SDRAM 12 Skew Control SDRAM (11:0) Skew Control CPUCLK2 Skew Control CPUCLK (1:0) Skew Control 0670B—07/15/04 6 PWD X X X X X X X X Description Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved ICS951901 Byte 18: Output Rise/Fall Time Select Register Byte 17: Output Rise/Fall Time Select Register Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 PWD Description 1 PCI (3:0) Slew Rate Control 0 1 PCI_F Slew Rate Control 0 1 CPUCLK2 Slew Rate Control 0 0 Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 CPUCLK1 Slew rate Control Byte 19: Output Rise/Fall Time Select Register Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 PWD 1 0 1 0 1 0 1 0 PWD 1 0 1 0 1 0 1 0 Description SDRAM12: Slew Rate Control AGPCLK1: Slew Rate Control AGPCLK0: Slew Rate Control PCICLK4: Slew Rate Control Byte 20: Output Rise/Fall Time Select Register Description Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 48MHz: Slew Rate Control 24_48MHz: Slew Rate Control REF1: Slew Rate Control REF0: Slew Rate Control SDRAM (11:0): Slew Rate Control PWD 0 0 0 0 0 0 0 Description Reserved Reserved Reserved Reserved Reserved Reserved CPUCLK0 Slew Rate Control VCO Programming Constrains VCO Frequency ...................... 150MHz to 500MHz VCO Divider Range ................ 8 to 519 REF Divider Range ................. 2 to 129 Phase Detector Stability .......... 0.3536 to 1.4142 Useful Formula VCO Frequency = 14.31818 x VCO/REF divider value Phase Detector Stabiliy = 14.038 x (VCO divider value)-0.5 To program the VCO frequency for over-clocking. 0. Before trying to program our clock manually, consider using ICS provided software utilities for easy programming. 1. Select the frequency you want to over-clock from with the desire gear ratio (i.e. CPU:SDRAM:3V66:PCI ratio) by writing to byte 0, or using initial hardware power up frequency. 2. Write 0001, 1001 (19H) to byte 8 for readback of 21 bytes (byte 0-20). 3. Read back byte 11-20 and copy values in these registers. 4. Re-initialize the write sequence. 5. Write a '1' to byte 9 bit 7 and write to byte 11 & 12 with the desired VCO & REF divider values. 6. Write to byte 13 to 20 with the values you copy from step 3. This maintains the output spread, skew and slew rate. 7. The above procedure is only needed when changing the VCO for the 1st pass. If VCO frequency needed to be changed again, user only needs to write to byte 11 and 12 unless the system is to reboot. 0670B—07/15/04 7 ICS951901 Absolute Maximum Ratings Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . Ambient Operating Temperature . . . . . . . . . . Case Temperature . . . . . . . . . . . . . . . . . . . . . . Storage Temperature . . . . . . . . . . . . . . . . . . . . 5.5 V GND –0.5 V to VDD +0.5 V 0°C to +70°C 115°C –65°C to +150°C 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 - 70°C; Supply Volt age VDD = 3.3 V +/-5%VDDL = 2.5 V +/-5% (unless otherwise stated) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS 2 VDD + 0.3 V Input High Voltage VIH VSS - 0.3 Input Low Voltage VIL Supply Current Power Down Input frequency 1 Input Capacitance IDD PD Fi CL=30 pF, CPU @ 66, 100 MHz CIN Logic Inputs CINX X1 & X2 pins Transition Time Ttrans To 1st crossing of target Freq. Settling Time 1 Clk Stabilization TS From 1st crossing to 1% target Freq. TSTAB From VDD= 3.3 V to 1% target Freq. TCPU-PCI TCPU-SDRAM CPUVT= 1.5 V PCI VT=1.25V CPUVT= 1.5 V SDRAM VT=1.25 Skew Skew 1 VDD = 3.3 V; Guaranteed by design, not 100% tested in production. 0670B—07/15/04 8 12 390 300 14.32 27 0.8 V 400 600 16 mA MHz 5 pF 45 pF mA 3 3 ms 1 1.9 4 ns -500 -300 0 ps ICS951901 Electrical Characteristics - CPU TA = 0 - 70°C; VDDL = 2.5 V +/-5%; VDDL = 2.5 V +/-5%; CL = 10-20 pF (unless otherwise specified) PARAMETER Rise Time1 Fall Time1 SYMBOL RDSP2B RDSN2B VOH2B VOL2B I OH2B I OL2B t r2B t f2B Duty Cycle1 1 Output Impedance Output Impedance1 Output High Voltage Output Low Voltage Output High Current Output Low Current CONDITIONS VO = VDD*(0.5) VO = VDD*(0.5) I OH = -12.0 mA I OL = 12 mA VOH = 1.7 V VOL = 0.7 V VOL = 0.4 V, VOH = 2.0 V VOH = 2.0 V, V OL = 0.4 V MIN 10 10 2 TYP MAX UNITS 20 20 V 0.4 V -19 mA mA 1.6 ns 1.6 ns 19 0.4 0.4 1.2 1.1 45 46.9 55 % dt2B VT = 1.25 V 0:1 tsk2B VT = 1.25 V 43 175 ps 0:2 tsk2B VT = 1.25 V 142 375 ps VT = 1.25 V, CPU=66 MHz 177 250 ps Skew window Skew window 1 Jitter, Cycle-to-cycle t jcyc-cyc 1 Guaranteed by design, not 100% tested in production. Electrical Characteristics - 24-48MHz TA = 0 - 70°C; VDD = 3.3 V +/-5%;VDDL = 2.5 V +/-5%; CL = 10-20 pF (unless otherwise specified) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Impedance RDSP5B 1 VO = VDD*(0.5) 20 60 Output Impedance Output High Voltage Output Low Voltage Output High Current Output Low Current Rise Time1 RDSN5B1 VOH15 VOL5 I OH5 I OL5 VO = VDD*(0.5) I OH = -14 mA I OL = 6.0 mA VOH = 2.0 V VOL = 0.8 V 20 2.4 60 t r5 VOL = 0.4 V, V OH = 2.4 V 0.4 t f5 dt5 VOH = 2.4 V, VOL = 0.4 V VT = 1.5 V VT = 1.5 V 0.4 45 1 Fall Time 1 Duty Cycle Jitter t cycle to cycle 0.4 -20 V V mA mA 1.45 4 ns 1.5 52.5 210 4 55 500 ns % ps 10 1 Guaranteed by design, not 100% tested in production. 0670B—07/15/04 9 ICS951901 Electrical Characteristics - PCI TA = 0 - 70°C; VDD = 3.3 V +/-5%; VDDL = 2.5 V +/-5%; CL = 10-30 pF (unless otherwise specified) PARAMETER SYMBOL Output Impedance RDSP1B1 RDSN1B1 Output Impedance Output High Voltage Output Low Voltage Output High Current Output Low Current Rise Time1 1 Fall Time 1 Duty Cycle Skew window1 Jitter, Cycle-to-cycle1 CONDITIONS MIN TYP MAX UNITS VO = VDD*(0.5) 12 55 VO = VDD*(0.5) I OH = -1 mA I OL = 1 mA VOH @ MIN = 1.0 V VOL @ MIN = 1.95 V 12 2.4 55 t r1 VOL = 0.4 V, VOH = 2.4 V 0.5 t f1 dt1 VOH = 2.4 V, V OL = 0.4 V VT = 1.5 V 0.5 45 t sk1 VT = 1.5 V VT = 1.5 V VOH1 VOL1 I OH1 I OL1 t jcyc-cyc1 0.55 -29 V V mA mA 2.3 2.5 ns 2.3 51.2 2.5 55 ns % 108 500 ps 353 500 ps 29 1 Guaranteed by design, not 100% tested in production. Electrical Characteristics - SDRAM TA = 0 - 70°C; VDD = 3.3 V +/-5%;VDDL = 2.5 V +/-5%; CL = 20-30 pF (unless otherwise specified) PARAMETER SYMBOL Output Impedance RDSP3B1 RDSN3B1 Output Impedance Output High Voltage Output Low Voltage Output High Current Output Low Current Rise Time1 1 Fall Time 1 Duty Cycle Skew window1(0:11) 1( 0:12) Skew window 1 Jitter, Cycle-to-cycle VOH3 VOL3 I OH3 I OL3 CONDITIONS MIN TYP MAX UNITS VO = VDD*(0.5) 10 24 VO = VDD*(0.5) I OH = -18 mA I OL = 9.4 mA VOH = 2.0 V VOL = 0.8V 10 2.4 24 0.4 -46 V V mA mA tr3 VOL = 0.4 V, VOH = 2.4 V 0.8 1.6 ns tf3 dt3 VOH = 2.4 V, VOL = 0.4 V VT = 1.5 V 0.8 48.5 1.6 55 ns % t sk3 VT = 1.5 V 192 250 ps t sk3 VT = 1.5 V 290 500 ps VT = 1.5 V, CPU=66,100,133 MHz 173 250 ps t jcyc-cyc3 1 Guaranteed by design, not 100% tested in production. 0670B—07/15/04 10 45 ICS951901 Electrical Characteristics - AGP TA = 0 - 70°C; VDD=3.3V +/-5%; CL = 20 pF (unless otherwise specified) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output Impedance RDSP4B 1 VO=VDD*(0.5) 12 55 Output Impedance Output High Voltage Output Low Voltage Output High Current Output Low Current Rise Time1 RDSN4B1 VOH4B VOL4B I OH4B IOL4B VO=VDD*(0.5) I OH = -18 mA I OL = 18 mA VOH = 2.0 V VOL = 0.8 V 12 2 55 19 t r4B VOL = 0.4 V, V OH = 2.4 V 0.5 t f4B dt4B VOH = 2.4 V, VOL = 0.4 V VT = 1.5 V VT = 1.5 V VT = 1.5 V 0.5 45 1 Fall Time 1 Duty Cycle Skew window1 Jitter Cyc-Cyc tsk 1 tjcyc-cyc 1 0.4 -19 V V mA mA 1.5 2 ns 1.6 52.3 55.5 239 2 55 175 500 ns % ps ps 1 Guaranteed by design, not 100% tested in production. Electrical Characteristics - REF TA = 0 - 70°C; VDD = 3.3 V +/-5%;VDDL = 2.5 V +/-5%; CL = 20 pF (unless otherwise stated) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Output High Voltage V OH5 I OH = -12 mA 2.4 V Output Low Voltage V OL5 IOL = 9 mA 0.4 V Output High Current I OH5 VOH = 2.0 V -22 mA Output Low Current I OL5 VOL = 0.8 V 16 mA 1 Rise Time tr5 VOL = 0.4 V, VOH = 2.4 V 1.8 4 ns Fall Time1 tf5 VOH = 2.4 V, VOL = 0.4 V 1.9 4 ns Duty Cycle1 dt5 V T = 50% 45 54.5 55 % 1 Guaranteed by design, not 100% tested in production. 0670B—07/15/04 11 ICS951901 General I2C serial interface information for the ICS951901 How to Write: How to Read: • • • • • • • • • • • • • • • Controller (host) sends a start bit. Controller (host) sends the write address D2 (H) ICS clock will acknowledge Controller (host) sends a dummy command code ICS clock will acknowledge Controller (host) sends a dummy byte count ICS clock will acknowledge Controller (host) starts sending Byte 0 through Byte 28 (see Note 2) • ICS clock will acknowledge each byte one at a time • Controller (host) sends a Stop bit Controller (host) will send start bit. Controller (host) sends the read address D3 (H) ICS clock will acknowledge ICS clock will send the byte count Controller (host) acknowledges ICS clock sends Byte 0 through byte 6 (default) ICS clock sends Byte 0 through byte X (if X(H) was written to byte 6). • Controller (host) will need to acknowledge each byte • Controller (host) will send a stop bit How to Write: Controller (Host) Start Bit Address D2(H) How to Read: Controller (Host) Start Bit Address D3(H) ICS (Slave/Receiver) ICS (Slave/Receiver) ACK Byte Count ACK Dummy Command Code ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK If 7H has been written to B6 ACK Dummy Byte Count Byte 0 Byte 0 Byte 1 Byte 1 Byte 2 Byte 2 Byte 3 Byte 3 Byte 4 Byte 4 Byte 5 Byte 5 Byte 6 Byte 6 ACK Byte 7 Byte 18 ACK If 1AH has been written to B6 ACK If 1BH has been written to B6 ACK If 1CH has been written to B6 ACK Stop Bit Byte 19 ACK Byte 20 ACK Stop Bit *See notes on the following page. 0670B—07/15/04 12 Byte18 Byte 19 Byte 20 ICS951901 Brief I2C registers description for ICS951901 Programmable System Frequency Generator Register Name Functionality & Frequency Select Register Byte Description PWD Default 2 0 Output frequency, hardware / I C frequency select, spread spectrum & output enable control register. See individual byte description Active / inactive output control registers/latch inputs read back. See individual byte description Output Control Registers 1-6 Vendor ID & Revision ID Registers 7 Byte Count Read Back Register 8 Watchdog Timer Count Register 9 Writing to this register will configure the number of seconds for the watchdog timer to reset. 10H 10 Bit [6:0] Watchdog enable, watchdog status and programmable 'safe' frequency' can be configured in this register. 000,0000 Watchdog Control Registers Byte 11 bit[7:4] is ICS vendor id 1001. Other bits in this register designate device revision ID of this part. Writing to this register will configure byte count and how many byte will be read back. Do not write 00H to this byte. This bit select whether the output frequency is control by hardware/byte 0 configurations or byte 11&12 programming. VCO Control Selection Bit 10 Bit [7] VCO Frequency Control Registers 11-12 These registers control the dividers ratio into the phase detector and thus control the VCO output frequency. Spread Spectrum Control Registers 13-14 These registers control the spread percentage amount. Group Skews Control Registers 15-16 Increment or decrement the group skew amount as compared to the initial skew. Output Rise/Fall Time Select Registers 17-20 These registers will control the output rise and fall time. See individual byte description 08H 0 Depended on hardware/byte 0 configuration Depended on hardware/byte 0 configuration See individual byte description See individual byte description Notes: 1. 2. 3. 4. 5. 6. 7. The ICS clock generator is a slave/receiver, I2C component. It can read back the data stored in the latches for verification. Readback will support standard SMBUS controller protocol. The number of bytes to readback is defined by writing to byte 8. When writing to byte 11 - 12, and byte 13 - 14, they must be written as a set. If for example, only byte 14 is written but not 15, neither byte 14 or 15 will load into the receiver. The data transfer rate supported by this clock generator is 100K bits/sec or less (standard mode) The input is operating at 3.3V logic levels. The data byte format is 8 bit bytes. To simplify the clock generator I2C interface, the protocol is set to use only Block-Writes from the controller. The bytes must be accessed in sequential order from lowest to highest byte with the ability to stop after any complete byte has been transferred. The Command code and Byte count shown above must be sent, but the data is ignored for those two bytes. The data is loaded until a Stop sequence is issued. At power-on, all registers are set to a default condition, as shown. 0670B—07/15/04 13 ICS951901 Shared Pin Operation Input/Output Pins 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. The I/O pins designated by (input/output) on the ICS951901 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. Via to VDD Programming Header 2K Via to Gnd Device Pad 8.2K Clock trace to load Series Term. Res. Fig. 1 0670B—07/15/04 14 ICS951901 CPU_STOP# Timing Diagram CPU_STOP# is an asychronous input to the clock synthesizer. It is used to turn off the CPU clocks for low power operation. CPU_STOP# is synchronized by the ICS94209. The minimum that the CPU clock is enabled (CPU_STOP# high pulse) is 100 CPU clocks. All other clocks will continue to run while the CPU clocks are disabled. The CPU clocks will always be stopped in a low state and start in such a manner that guarantees the high pulse width is a full pulse. CPU clock on latency is less than 4 CPU clocks and CPU clock off latency is less than 4 CPU clocks. Notes: 1. All timing is referenced to the internal CPU clock. 2. CPU_STOP# is an asynchronous input and metastable conditions may exist. This signal is synchronized to the CPU clocks inside the ICS94209. 3. All other clocks continue to run undisturbed. (including SDRAM outputs). 0670B—07/15/04 15 ICS951901 PCI_STOP# Timing Diagram PCI_STOP# is an asynchronous input to the ICS94209. It is used to turn off the PCICLK clocks for low power operation. PCI_STOP# is synchronized by the ICS94209 internally. The minimum that the PCICLK clocks are enabled (PCI_STOP# high pulse) is at least 10 PCICLK clocks. PCICLK clocks are stopped in a low state and started with a full high pulse width guaranteed. PCICLK clock on latency cycles are only one rising PCICLK clock off latency is one PCICLK clock. Notes: 1. All timing is referenced to the Internal CPUCLK (defined as inside the ICS94209 device.) 2. PCI_STOP# is an asynchronous input, and metastable conditions may exist. This signal is required to be synchronized inside the ICS94209. 3. All other clocks continue to run undisturbed. 4. CPU_STOP# is shown in a high (true) state. 0670B—07/15/04 16 ICS951901 SDRAM_STOP# Timing Diagram SDRAM_STOP# is an asychronous input to the clock synthesizer. It is used to stop SDRAM clocks for low power operation. SDRAM_STOP# is synchronized to complete it's current cycle, by the ICS94209. All other clocks will continue to run while the SDRAM clocks are disabled. The SDRAM clocks will always be stopped in a low state and start in such a manner that guarantees the high pulse width is a full pulse. Notes: 1. All timing is referenced to the internal CPU clock. 2. SDRAM is an asynchronous input and metastable conditions may exist. This signal is synchronized to the SDRAM clocks inside the ICS94209. 3. All other clocks continue to run undisturbed. 0670B—07/15/04 17 ICS951901 PD# Timing Diagram The power down selection is used to put the part into a very low power state without turning off the power to the part. PD# is an asynchronous active low input. This signal needs to be synchronized internal to the device prior to powering down the clock synthesizer. Internal clocks are not running after the device is put in power down. When PD# is active low all clocks need to be driven to a low value and held prior to turning off the VCOs and crystal. The power up latency needs to be less than 3 mS. The power down latency should be as short as possible but conforming to the sequence requirements shown below. PCI_STOP# and CPU_STOP# are considered to be don't cares during the power down operations. The REF and 48MHz clocks are expected to be stopped in the LOW state as soon as possible. Due to the state of the internal logic, stopping and holding the REF clock outputs in the LOW state may require more than one clock cycle to complete. Notes: 1. All timing is referenced to the Internal CPUCLK (defined as inside the ICS94209 device). 2. As shown, the outputs Stop Low on the next falling edge after PD# goes low. 3. PD# is an asynchronous input and metastable conditions may exist. This signal is synchronized inside this part. 4. The shaded sections on the VCO and the Crystal signals indicate an active clock. 5. Diagrams shown with respect to 133MHz. Similar operation when CPU is 100MHz. 0670B—07/15/04 18 ICS951901 c N SYMBOL L E1 INDEX AREA A A1 b c D E E1 e h L N α E 1 2 h x 45° D 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 N -Ce SEATING PLANE b .10 (.004) C 48 VARIATIONS D mm. MIN MAX 15.75 16.00 D (inch) MIN .620 Reference Doc.: JEDEC Publication 95, MO-118 10-0034 300 mil SSOP Package Ordering Information ICS951901yFLF-T Example: ICS XXXXXX y F LF- T Designation for tape and reel packaging Lead Free (Optional) Package Type F = SSOP Revision Designator (will not correlate with datasheet revision) Device Type Prefix ICS = Standard Device 0670B—07/15/04 19 MAX .630