Clock Generator DIMM, Pentium Boards Preliminary Product Informat
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SC654
Clock Generator DIMM, Pentium Boards
Preliminary Product Information PRODUCT FEATURES
Individual clock stop controls power mobile applications reduction Designed meet Inteltm specifications Integrated crystal loading capacitors Supports Intel Pentium, Pentium Pro, Pentium Cyrix CPU's clocks (synchronous asynchronous) <250 skew CPU/SDRAM clocks <500 between clocks Ref. Clocks 14.31818 MHz, VDDC (IOAPIC) Separate VDDC CPUL (1:3) clock buffers IOAPIC Programmable registers jumperless frequency selection SSOP Package
PRODUCT DESCRIPTION
device high fanout reducing system clock generator that provides large quantity clocks needed support motherboard. Bi-directional pins provided maximize functionality device provide input control features required user flexibility.
FREQUENCY TABLE (MHz)
(Functionality with 14.31818 input) Frequency Select CPUs (1:6) BSEL BSEL 60.0 30.0 32.0. 66.8 33.4 32.0 25.0 32.0 27.5 32.0 37.5 32.0 68.7 34.4 32.0 83.3 41.7 32.0 Tri-state Tri-state Tri-state
BLOCK DIAGRAM CONNECTION DIAGRAM
Xout
IMISC654
REF/FS1
REF/FS1 XOUT PCI1 PCI2 PCI3 PCI4 PCI5 PCI6 PCI7/FS0 SDR12 SDR11 24M/BSEL 48M/FS2 IOAPIC CPUL1 CPUL2 VDDC CPUL3 SDR1 SDR2 VDDS SDR3 SDR4 SDR5 SDR6 VDDS SDR7 SDR8 CPUH1 CPUH2
PLL1
48M/FS2
BSEL
24M/BSEL IOAPIC VDDC CPUL (1:3) PLL2
FS(0:2) LATCH
CPUH(1:2) (1:12)
VDDS
SDATA SCLK
CONTROL LOGIC
32MHz BSEL
(1:6) PCI7/FS0
VDDS SDR10 SDR9 SDATA SCLK
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.2
4/15/97 Page
SC654
Clock Generator DIMM, Pentium Boards
Preliminary Product Information
DESCRIPTION
Name POWE TYPE OSC1 Description On-chip reference oscillator input pin. Requires either external parallel resonant crystal (nominally 14.318 MHz) externally generated reference signal. internal crystal loading capacitor. On-chip reference oscillator output pin. Drives external parallel resonant crystal. When externally generated reference signal used, this left unconnected. internal crystal loading capacitor. Clock output. frequency table specified. Power applied VddC Clock output. skew copy clock used drive SDRAM clock pins.
Xout
OSC1
CPUL[1:3] [1:12]
VDDC VDDS
BUF1 BUF2
CPUH(1:2) [1:6] 48M/FS2
BUF1 BUF1 BUF4 BUF3
REF/FS1
24M/BSEL
PCI7/FS0
1,6, 9,16,22, 27,33,39,
SDATA SCLK VDDC VDDS
Clock output. skew copy clock used drive SDRAM clock pins. Powered applied Clock output. frequency table specified. Power applied Pins. Bi-directional pin. During powerup sets bit. Afterwards, 48.0 output clock. internal pullup. Bi-directional pin. During powerup sets bit. Afterwards, 14.31818 reference output clock. internal pullup Bi-directional pin. During powerup sets mode (BSEL) bit. Afterwards, 24.0 reference output clock. Bi-directional during power logic level latched defines selection frequency table. FS0. After power acts clock output defined [1:6] pins. data input internal pullup. clock input pin. internal pullup. volt core, clock fixed clock power. volt clock power volt power SDRAM CPUH buffers Device ground
IOAPIC
VDDC
BUF4
This 14.31818 clock. output buffers supplied VDDC volts.
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.2
4/15/97 Page
SC654
Clock Generator DIMM, Pentium Boards
Preliminary Product Information
Selection Bi-directional Pins
Bi-directional pins used selecting different functions this device (see description, Page During power-up device, these pins input mode therefore, they considered input select pins. Internal these pins have large value pull-up each (100K), therefore, selection default. selection desired, then direct connection ground through resistor should implemented shown Fig.3. Please note selection resistor (10K) placed before Damping resistor (Rd) close devices pin.
Device Bi-directional Fig. load
2-WIRE CONTROL INTERFACE 2-wire control interface implements write only slave interface. device cannot read back. Sub-addressing supported, thus preceding bytes must sent order change control bytes. 2-wire control interface allows each clock output individually enabled disabled. During normal data transfer, SDATA signal only changes when SDCLK signal low, stable when SDCLK high. There exceptions this. high transition SDATA while SDCLK high used indicate start data transfer cycle. high transition SDATA while SDCLK high indicates data transfer cycle. Data always sent complete 8-bit bytes, after which acknowledge generated. first byte transfer cycle 7-bit address with Read/Write LSB. Data transferred first. device will respond writes bytes (max) data address generating acknowledge (low) signal SDATA wire following reception each byte. device will respond other control interface conditions. Previously control registers retained.
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.2
4/15/97 Page
SC654
Clock Generator DIMM, Pentium Boards
Preliminary Product Information SERIAL CONTROL REGISTERS
NOTE: Pin# column lists affected number where applicable. @Pup column gives state true power Bytes values shown only true power Following acknowledge Address Byte (D2), additional bytes must sent: "Command Code byte, "Byte Count" byte. Although data (bits) these bytes considered "don't care", they must sent will acknowledged.
After Command Code Count bytes have been acknowledged, below described sequence (Byte Byte Byte2, will valid acknowledged. Byte Clock Register enable, Stopped) @Pup Pin# Description BSEL (frequency Table Selection I2C) (frequency Table Selection I2C) (frequency Table Selection I2C) (frequency Table Selection I2C) enable frequency selection hardware (set software (set Reserved future Spread Spectrum function Tri-State Reserved testing function Test Mode Normal
Function Table Function Description Tri-State Test (BSEL=1) Test (BSEL=0) Normal Outputs Hi-Z Tclk/2 Tclk/2 table Hi-Z Tclk/4 Tclk/3 table
SDRAM
Hi-Z Tclk/2 Tclk/2
Hi-Z Tclk Tclk 14.318
IOAPIC Hi-Z Tclk Tclk 14.318
Notes: Tclk test clock over driven input during test mode.
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.2
4/15/97 Page
SC654
Clock Generator DIMM, Pentium Boards
Preliminary Product Information SERIAL CONTROL REGISTERS (Cont.) Byte CPU, SIO, Clock Register enable, Stopped) @Pup Pin# Description enable/Stopped enable/Stopped Reserved CPUH2 enable/Stopped CPUH1 enable/Stopped CPUL3 enable/Stopped CPUL2 enable/Stopped CPUL1 enable/Stopped
Byte Clock Register enable, Stopped) @Pup Pin# Description Reserved PCI7 enable/Stopped PCI6 enable/Stopped PCI5 enable/Stopped PCI4 enable/Stopped PCI3 enable/Stopped PCI2 enable/Stopped PCI1 enable/Stopped
Byte SDRAM Clock Register enable, Stopped @Pup Pin# Description SDRAM8 enable/Stopped SDRAM7 enable/Stopped SDRAM6 enable/Stopped SDRAM5 enable/Stopped SDRAM4 enable/Stopped SDRAM3 enable/Stopped SDRAM2 enable/Stopped SDRAM1 enable/Stopped
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.2
4/15/97 Page
SC654
Clock Generator DIMM, Pentium Boards
Preliminary Product Information SERIAL CONTROL REGISTERS (Cont.) Byte Additional SDRAM Clock Register enable, Stopped) @Pup Pin# Description Reserved Reserved Reserved Reserved SDRAM12 enable/Stopped SDRAM11 enable/Stopped SDRAM10 enable/Stopped SDRAM9 enable/Stopped
Byte Peripheral Control enable, Stopped) @Pup Pin# Description Reserved Reserved Reserved IOAPIC enable/Stopped Reserved Reserved Reserved REF1/FS1 enable/Stopped
Byte Reserved Register @Pup Pin# Description Reserved Reserved Reserved Reserved Reserved Reserved Reserved Reserved
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.2
4/15/97 Page
SC654
Clock Generator DIMM, Pentium Boards
Preliminary Product Information MAXIMUM RATINGS
Maximum Power Supply: Relative VSS: -0.3V VDD+0.3 Storage Temperature: Operating Temperature: Maximum Power Dissipation: ESD: 12Kv(inputs), (outputs) Note. pins must connected their required potentials avoid device damage This device contains circuitry protect inputs against damage high static voltages electric field; however, precautions should taken avoid application voltage higher than maximum rated voltages this circuit. proper operation, Vout should constrained range: VSS<(Vin Vout)<VDD Unused inputs must always tied appropriate logic voltage level (either VDD).
ELECTRICAL CHARACTERISTICS
Characteristic Input Voltage Input High Voltage Input Current Input High Current Tri-State leakage Current Static Supply Current Dynamic Supply Current Powered down Supply Current Input Capacitance Logic Gates Input Capacitance andXout pins Symbol Isdd Cioi, Cioo Units Conditions logic inputs logic inputs logic inputs logic inputs logic outputs 66.6 Mhz, clocks loaded 66.6 Mhz, clocks specified capacitance level logic input pins Reference Oscillator pins. Effective load crystal half this value.
=3.3 VDDC 2.5V
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.2
4/15/97 Page
SC654
Clock Generator DIMM, Pentium Boards
Preliminary Product Information
TIMING CHARACTERISTICS
Parameters
Skew SDRAM SDRAM Skew SDRAM Skew Skew Offset Output Duty Cycle Cycle Cycle Jitter Long Term Jitter
Symbol
Tskw1 Tskw2 Tskw3 Tskw4 Toff Tdty Tccj
Units
Conditions
Load, Measured 1.25V Load, Measured 1.5V CPU: Load, Measured 1.25V SDRAM: Load, Measured 1.5V Load, Measured 1.5V CPU: Load, Measured 1.25V PCI: Load, Measured 1.5V CPU, IOAPIC: Load, Meas. 1.25V PCI, SDRAM, REF, 48MHz, 24MHz Load, Measured 1.5V
=3.3V VDDC 2.5V BUF1 (CPU clocks) Characteristic
pull-up Current Pull-Down Current Rise/Fall times Clock High Time Clock Time
Symbol
Units
Conditions
VOHmin 1.0V, VOHmax VOLmin 1.2v, VOLmax 0.3V Load, Measured 0.4V 2.0V Load, Measured Load, Measured 0.4V
VDD3 =3.3V VDDC 2.5V BUF2 (REF SDRAM clocks) Characteristic
Pull-Up Current Pull-Down Current Rise/Fall times Clock High Time Clock Time
Symbol
Units
Conditions
VOHmin 1.0V, VOHmax VOLmin 1.2v, VOLmax 0.3V Load, Measured 0.4V 2.0V Load, Measured Load, Measured 0.4V
=3.3V VDDC 2.5V
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.2
4/15/97 Page
SC654
Clock Generator DIMM, Pentium Boards
Preliminary Product Information
BUF3 (PCI clocks) Characteristic
Pull-Up Current Pull-Down Current Rise/Fall times Clock High Time Clock Time
Symbol
Units
Conditions
VOHmin 1.0V, VOHmax VOLmin 1.2v, VOLmax 0.3V Load, Measured 0.4V 2.0V Load, Measured Load, Measured 0.4V
=3.3V VDDC 2.5V BUF4 (IOAPIC fixed clocks) Characteristic
Pull-Up Current Pull-Down Current Rise/Fall times Clock High Time Clock Time
Symbol
Units
Conditions
VOHmin 1.0V, VOHmax VOLmin 1.2v, VOLmax 0.3V Load, Measured 0.4V 2.0V Load, Measured Load, Measured 0.4V
=3.3V VDDC 2.5V+/-
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.2
4/15/97 Page
SC654
Clock Generator DIMM, Pentium Boards
Preliminary Product Information
CRYSTAL REFERENCE OSCILLATOR PARAMETERS
Characteristic Frequency Tolerance Symbol VBIAS 12.00 0.3Vdd 14.31818 Vdd/2 16.00 +/-100 0.7Vdd Ohms Units Conditions Calibration note Stability +60C) note Aging (first year 25C) note Parallel Resonant Capacitance Xout pins
Mode Capacitance Bias Voltage Startup time Load Capacitance Effective Series resonant resistance
note
Power Dissipation 0.10 note Shunt Capacitance maximum accuracy, total circuit loading capacitance should equal This loading capacitance effective capacitance across crystal pins includes device capacitance (CP) parallel with circuit traces, clock generator onboard discrete load capacitors. Typical trace capacitance, traces less than inch with internal capacitance total parasitic capacitance would this instance capacitor added both legs (pins) crystal would bring total load recommended each leg) Note recommended mandatory chooses crystal that meets these specifications.
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.2
4/15/97 Page
SC654
Clock Generator DIMM, Pentium Boards
Preliminary Product Information
PACKAGE DRAWING DIMENSIONS SSOP OUTLINE DIMENSIONS
INCHES SYMBOL
MILLIMETERS 0.110 0.016 0.095 0.013 0.010 0.637 0.299 0.20 2.16 0.20 0.15 7.39 0.30 2.29 0.25 0.20 15.88 7.49 0.64 0.420 0.040 10.03 0.64 10.36 0.76 10.67 1.02 2.79 0.41 2.41 0.33 0.25 16.18 7.59
0.008 0.085 0.008 0.006 0.291
0.012 0.090 0.010 0.008 0.625 0.295 0.025
0.395 0.025
0.408 0.030
ORDERING INFORMATION
Part Number IMISG654AYB Note: Package Type SSOP Production Flow Commercial,
ordering part number formed combination device number, device revision, package style, screening.
Note: Purchase components International Microcircuits, Inc. sublicensed Associated Companies conveys license under Philips Patent Rights these components system, provided that system conforms Standard Specification defined Philips.
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.2
4/15/97 Page
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