Clock Generator DIMM, 2.5V Pentium® Design FREQUENCY TABLE (MHz)
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SC661
Clock Generator DIMM, 2.5V Pentium® Design
FREQUENCY TABLE (MHz)
Pro, tristate 66.6 test tristate a.32 27.5 37.5 33.3 test
Supports Pentium Pentium Cyrix CPU's.
Pentium
host clocks additional SDRAM support. Optional common mixed supply mode VDDRM VDDCPU VDDIO 3.3V VDDRM VDDCPU 3.3V, VDDIO 2.5V VDDRM 3.3V, VDDCPU VDDIO 2.5V 3.3V, VDDRM VDDCPU VDDIO 2.5V
a.32 Asynchronous PCI.
skew SDRM* buffers skew buffers Buffer output impedance ohms package minimum board space easy layout
BLOCK DIAGRAM
CONNECTION DIAGRAM
XOUT IOAPIC
VDDIO VDDCPU
PLL1
CPU(1:4) SDRM(1:4)
VDDRM
SDRM(5:8) SDRM(9:12) PCI(1:8) 48MHz 24MHz
VDDIO REF1 XOUT SEL2 SEL1 SEL0
VDDRM SDRM8 SDRM7 SDRM6 SDRM5 SDRM4 SDRM3 SDRM2 SDRM1 VDDRM
PLL2
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.7
5/19/98 Page
SC661
Clock Generator DIMM, 2.5V Pentium® Design
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 which case Xout must kept unconnected. Standard frequency select inputs. These inputs have internal pull-ups(> 100K CPU(1:4) skew (<250 clock outputs host frequencies such CPU, Chipset, Cache, etc. CPU1CPU4 voltage level controlled VDDCPU. SDRM(1:12) skew (<250 clock outputs SDRAM. Voltage level controlled VDDRM. IOAPIC Buffered output clock crystal. Voltage level controlled VDDIO. PCI(1:8) skew (<250pS) clock outputs frequencies. These buffers voltage level controlled VDD. Buffered output on-chip reference. 48MHz Frequency output USB. 24MHz Frequency output Floppy Drive. Circuit ground. Positive power supply. VDDCPU 3.3V/2.5V logic level control CPU(1:4) outputs. Voltage cannot greater than VDD. VDDRM 3.3V logic level control SDRM(1:12) outputs. Voltage cannot greater than VDD. VDDIO 3.3V/2.5V logic level control IOAPIC output. Voltage cannot greater than VDD.
MAXIMUM RATINGS
This device contains circuitry protect inputs against damage high static voltages electric Voltage Relative VSS: Voltage Relative VDD: Storage Temperature: Operating Temperature: Maximum Power Supply: -0.3V 0.3V 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).
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.7
5/19/98 Page
SC661
Clock Generator DIMM, 2.5V Pentium® Design
ELECTRICAL CHARACTERISTICS
Characteristic Input Voltage Input High Voltage Input Low, High Current with Pull- Pull-down Output Voltage Output High Voltage Tri-State leakage Current Dynamic Supply Current Static Supply Current Short Circuit Current Symbol IIL, (PD) Units Conditions S0-S2 Inputs Outputs Outputs Outputs 66.6 MHz, 33.3 Clocks Unloaded. output time seconds
VDDCPU VDDRM 3.3V+5%,
TB4-M BUFFER SWITCHING CHARACTERISTICS (ALL OUTPUTS)
Characteristic Output Rise (0.4V 2.0V) Fall (2.0V-0.4V) time Output Duty Cycle Offset Buffer Skew CPU, SDRAM Buffer Outputs Period Cycles, Jitter Absolute, Symbol tTLH, tTHL tOFF tSKEW Units Conditions Load CPU, SDRAM outputs Measured 1.5V Load Measured 1.5V Load Measured 1.5V
tjab
+250
(Long term jitter measured over minute period)
VDDCPU VDDRM 3.3V+5%,
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.7
5/19/98 Page
SC661
Clock Generator DIMM, 2.5V Pentium® Design
LAYOUT SUGGESTION
(10µf) plane island plane
IMISC661
(10µf)
(10µf)
This only layout suggestion best performance lower EMI. designer choose differnent approach such using traces instead islands (dashed areas). Also, designer choose less than three beads. Regardless which layout implemented, Bypass caps C10, (all should always used placed close their pins possible.
NOTES
POWER SUPPLY BYPASS CAPS (O.1UF) MUST POSITIONED CLOSE POSSIBLE PINS EFFECTIVE. BYPASS CAPS MUST LEAKAGE SUCH MULTILAYER CERAMIC MATERIAL WHICH ALSO RESULTS LOWER IMPEDANCE HIGH FREQUENCY. FERRITE BEAD
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.7
5/19/98 Page
SC661
Clock Generator DIMM, 2.5V Pentium® Design
PACKAGE DRAWING DIMENSIONS OUTLINE DIMENSIONS
INCHES SYMBOL 0.026 0.009 0.00 0.077 0.537 0.390 0.084 .006 0.079 0.547 0.394 0.307 .0256 0.031 0.037 0.65 0.015 0.22 0.093 .010 0.083 0.557 0.398 0.00 1.95 13.65 9.90 MILLIMETERS 2.13 0.15 2.00 13.90 10.00 7.80 0.65 0.80 0.95 0.38 2.35 0.25 2.10 14.15 10.10
ORDERING INFORMATION
Part Number IMISC661BAB Note:
Marking:
Package Type
Production Flow Commercial,
ordering part number formed combination device number, device revision, package style, screening shown below.
Example: SC661BAB Date Code,
IMISC661BAB Flow Commercial, Package Revision Device Number
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.7
5/19/98 Page
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