Clock Generator Pentium Notebook Designs. Supports Intel chipset.
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SC651
Clock Generator Pentium Notebook Designs.
Supports Intel chipset. Supports Pentium CPUs. Supports Synchronous DRAM requirements. host (CPU/AGP) clocks SDRAM clocks. Optional common mixed supply mode (Vdd Vddq3 Vddq4 Vddq2 3.3V) (Vdd Vddq3 Vddq4 3.3V, Vddq2 2.5V) skew buffers skew buffers Supports Power Management function. SSOP package minimum board space
FREQUENCY TABLE
60.0 66.6 30.0 33.3
CONNECTION DIAGRAM
REF1 REF0 Xout Vddq4 PCICLK_F PCICLK1 REF2 Vddq2 IOAPIC PWR_DWN# CPUCLK0 CPUCLK1 Vddq2 CPUCLK2 CPUCLK3 SDRAM0 SDRAM1 Vddq3 SDRAM2 SDRAM3 SDRAM4 SDRAM5 Vddq3 CPU_STOP# PCI_STOP#
BLOCK DIAGRAM
Buffers Xout Vddq2 IOAPIC Buffer
Vddq3
PCICLK2 PCICLK3 REF0,1,2 PCICLK4 PCICLK5 Vddq4 PCICLK6 SDRAM0~5 PCICLK1~6 Vddq4 48MHZ 24MHZ PCICLK_F
Vddq2 Buffers Vddq3 Buffers Buffers CPUCLK0~3
CPU_STOP#
Vddq3
PWR_DWN#
PLL1
PCI_STOP# Buffer Buffer 48MHZ PLL2 Buffer 24MHZ
Vddq4
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.3
1/23/97 Page
SC651
Clock Generator Pentium Notebook Designs.
DESCRIPTION
Xin, Xout These pins form on-chip reference oscillator when connected terminals external parallel resonant crystal (nominally 14.318 MHz). also serve input externally generated reference signal. Standard frequency select input. internal pull-up. CPUCLK(0:3) skew (<250 clock outputs host frequencies such CPU, Chipset, Cache. Vddq2 supply voltage these outputs. When CPU_STOP# becomes low, clocks stop SDRAM(0:5) Synchronous DRAM DIMs clocks. They powered Vddq3. When CPU_STOP# becomes low, SDRAM (0:5) clocks stop PCICLK(1:6) skew (<250pS) clock outputs frequencies. These buffers voltage level controlled Vddq3. When PCI_STOP# becomes low, clocks stop PCICLK_F clock output that does stop until power down mode. synchronous with other clocks. REF(0:2) Buffered outputs on-chip reference. These outputs have 60mA switching current 3.3V. IOAPIC Buffered output 14.3MHZ multiprocessor support. powered Vddq2.
48MHz Frequency output USB. 24MHz Frequency output super I/O. CPU_STOP# Active signal stop clocks when low. high normal operation internal pull-up. PCI_STOP# Active signal stop clocks, except PCICLK_F, when low. high normal operation internal pull-up. PWR_DWN# Power down turn power whole chip down including VCOs PCICLK_F output pin. internal pull-up Ground pins chip. Power supply pins analog circuit core logic. Vddq3 Power supply pins 3.3V pins. Vddq2 Power supply pins 2.5V/3.3V pins. Vddq4 Power supply 3.3V fixed clock pins. connection pins.
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.3
1/23/97 Page
SC651
Clock Generator Pentium Notebook Designs.
POWER MANAGEMENT FUNCTIONS
IMISC651 clocks disabled according following table order reduce power consumption. clocks stopped state. clocks maintain valid high period transitions from running stopped. high transitions PWR_DWN#, external circuitry should allow VCOs stabilize prior releasing PCI_STOP# CPU_STOP# high level. clocks transition between running stopped waiting positive edge PCICLK_F followed negative edge clock interest, after which high levels output either enabled disabled.
CPU_STOP#
PCI_STOP#
PWR_DWN#
CPUCLK 66/60 66/60
PCICLK 33/30 33/30
OTHER CLKs RUNNING RUNNING RUNNING RUNNING
XTAL VCOs RUNNING RUNNING RUNNING RUNNING
POWER MANAGEMENT TIMING
PCICLK_F
PCI_STOP#
PCICLK(0:5)
CPU_STOP#
CPUCLK(0:3)
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.3
1/23/97 Page
SC651
Clock Generator Pentium Notebook Designs.
MAXIMUM RATINGS
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).
Voltage Relative VSS: Voltage Relative VDD: Storage Temperature: Ambient Temperature: Maximum Power Supply:
-0.3V 0.3V
ELECTRICAL CHARACTERISTICS
Characteristic Input Voltage Input High Voltage Input Current Input High Current Output Current Output High Current Output Current Output High Current Tri-State leakage Current Dynamic Supply Current Static Supply Current Short Circuit Current Symbo IOL1 IOH1 IOL2 IOH2 Units 66.6 Mhz, Load PWR_DWN# output time seconds VOL1 1.6V CPU, SDRAM, PCI, IOAPIC REF0 clocks) VOH1 1.0V CPU, SDRAM, PCI, IOAPIC REF0 clocks) VOL2 1.9V 48Mhz, Mhz, REF2 REF1 clocks) VOH2 1.0V 48Mhz, Mhz, REF2 REF1 clocks) Conditions
VDDq2 VDDq3 3.3V +5%, Contact IBIS models. INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571 Rev.1.3 1/23/97 Page
SC651
Clock Generator Pentium Notebook Designs.
SWITCHING CHARACTERISTICS
Characteristic Output Rise (0.4V 2.0V) Fall (2.0V-0.4V) time Output Duty Cycle CPU/SDRAM Offset Skew (CPU-CPU), (PCIPCI), (SDRAM-SDRAM) Skew (CPU-SDRAM) Period Cycles, Jitter Absolute, Overshoot/Undershoot Beyond Power Rails Ring Back Exclusion Symbol tTLH, tTHL tOFF tSKEW1 Units Conditions Load outputs Measured 1.5V Load Measured 1.5V Load Measured 1.5V
tSKEW2 tjab Vover
+250
Load Measured 1.5V ohms source inch load note1
VRBE
VDDq2 VDDq3 3.3V +5%, note Ring Back must enter this range.
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.3
1/23/97 Page
SC651
Clock Generator Pentium Notebook Designs.
LAYOUT RECOMMENDATION
plane plane
VCC1
IMISC65
10µF
VCC2
10µF
This only layout recommendation best performance lower EMI. designer choose differnent approach C10, C11and (all 0.1µf) should always used placed close their pins.
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.3
1/23/97 Page
SC651
Clock Generator Pentium Notebook Designs.
PACKAGE DRAWING DIMENSIONS
SSOP OUTLINE DIMENSIONS
INCHES SYMBOL
MILLIMETERS 0.110 0.016 0.092 0.0135 0.010 0.630 0.299 2.41 0.20 2.24 0.203 0.127 15.75 7.42 2.59 0.31 2.29 0.254 15.88 7.52 0.635 0.410 0.016 0.040 0.100 10.16 0.25 0.61 2.16 10.31 0.33 0.81 2.36 10.41 0.41 1.02 2.54 2.79 0.41 2.34 0.343 0.254 16.00 7.59
0.095 0.008 0.088 0.008 0.005 0.620 0.292
0.102 0.012 0.090 0.010 0.625 0.296 0.025
0.400 0.10 0.024 0.085
0.406 0.013 0.032 0.093
ORDERING INFORMATION
Part Number IMISC651EYB Note:
Marking:
Package Type SSOP
Production Flow Commercial,
ordering part number formed combination device number, device revision, package style, screening shown below.
Example: SC651EYB Date Code,
IMISC651EYB Flow Commercial, Package SSOP Revision Device Number
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.3
1/23/97 Page
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