Clock/Frequency Generator 440FX w/Pentium Systems FREQUENCY TABLE

The Datasheet Archive - 100 Million Datasheets from 7500 Manufacturers.

Clock/Frequency Generator 440FX w/Pentium Systems FREQUENCY TABLE

Datasheet Thumbnail

Top Searches for this datasheet

SC672A
Clock/Frequency Generator 440FX w/Pentium Systems
FREQUENCY TABLE
SSEL1 SEL0 Tristate 63.0 69.87 XIN/2 66.44 Tristate 31.5 34.94 XIN/4 33.22
Designed Intel spec. supporting next generation Intel processor Pentium-pro's with 2.5V clocking requirements with Intel 440FX chipset. host (CPU) clocks. IOAPIC multiprocessing. Power management Mobile applications. skew buffers skew buffers SSOP package minimum board space
Don't Care
CONNECTION DIAGRAM
REF1 REF0 XOUT PCI_en VDDq4 PCICLK0 PCICLK1 PCICLK2 PCICLK3 PCICLK4 PCICLK5 VDDq4 PCICLK6 PCICLK7 VDDq3 REF2 VDDq2 IOAPIC CPUCLK0 CPUCLK1 VDDq2 CPUCLK2 CPUCLK3 VDDq3 SVSS CPU_en PWR_DWN# SEL0 SEL1
BLOCK DIAGRAM
XOUT
REF(0:2) IOAPIC
SSEL1 SEL0
PLL1
VDDq2
CPUCLK(0:3)
PCICLK(0:7)
PCI_en CPU_en
PWR_DWN#
Power Manager
PLL2
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.7
12/18/97 Page
SC672A
Clock/Frequency Generator 440FX w/Pentium Systems
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. SEL(0:1) Standard frequency select inputs. They have internal pull-ups. CPUCLK(0:3) skew (<250 clock outputs host frequencies such CPU, Chipset, Cache. VDDq2 supply voltage these outputs. PCICLK(0:7) skew (<250pS) clock outputs frequencies. They synchronous CPUCLK's. REF(0:2) Buffered outputs reference 14.3 MHz. Power supply pins analog core circuitry. IOAPIC Buffered output 14.3 multiprocessor support. powered VDDq2. Frequency output USB. Frequency output super I/O. output frequency. VDDq4 Power supply pins 3.3V bus. VDDq3 Power supply pins 3.3V pins. VDDq2 Power supply pins 2.5V/3.3V pins. connection pins. PWR_DWN# Power down turn power whole chip down including VCOs crystal buffer. internal Pull-Up CPU_en Active signal stop clocks when low. high normal operation internal Pull-Up. PCI_en Active signal stop clocks, when low. high normal operation internal Pull-Up. System test mode. Increased clocks 4.75% system timing testing when low. Ground pins chip.
FUNCTION TABLE
SEL1 SEL0 Tristate Note1 Note1 Tristate Note1 Note1 REF(0:2) Tristate 14.318 14.318 IOAPIC Tristate 14.318 14.318 Tristate XIN/4 Tristate XIN/2 Tristate XIN/12
XIN/2 XIN/4 Note1: Frequency Table, Page
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.7
12/18/97 Page
SC672A
Clock/Frequency Generator 440FX w/Pentium Systems
POWER MANAGEMENT FUNCTIONS
IMISC672 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_en CPU_en high level. clocks transition between running stopped following latency table bellow. clocks stopped after complete period their state. CPU_en PCI_en PWR_DWN# CPUCLK Note2 Note2 PCICLK Note2 Note2 OTHER CLKs RUNNING RUNNING RUNNING RUNNING XTAL VCOs RUNNING RUNNING RUNNING RUNNING
Note2: Frequency Table, Page Signal CPU_en PCI_en PWR_DWN# Signal State (disabled) (enabled) (disabled) (enabled) (power off) (normal)
Pulse Width (count clocks)
Latency (count clocks)
Latency (count clocks)
MAXIMUM RATINGS
This device contains circuitry protect inputs Voltage Relative VSS: Voltage Relative VDD: Storage Temperature: Operating Temperature: Maximum Power Supply: -0.3V 0.3V 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).
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.7
12/18/97 Page
SC672A
Clock/Frequency Generator 440FX w/Pentium Systems
ELECTRICAL CHARACTERISTICS
Characteristic Input Voltage Input High Voltage Input Current Input High Current Output Voltage Output High Voltage Tri-State leakage Current Dynamic Supply Current Static Supply Current Symbol Units Conditions
Outputs (see switching spec) Outputs (see switching spec)
Short Circuit Current
66.6 MHZ, Load 66.6 MHZ, Load CPU_en PCI_en output time seconds
VDDq2 VDDq3 VDDq4 3.3V+5%,
SWITCHING CHARACTERISTICS
Characteristic Output Duty Cycle CPUCLK(0:3) High Time CPUCLK(0:3) Time CPUCLK(0:3) High Time CPUCLK(0:3) Time Offset Buffer Skew Buffer Outputs Period Adjacent Cycles Jitter Aboslute, Overshoot/Undershoot Beyond Power Rails Ring Back Exclusion Symbol tHKH tHKL tHKH tHKL tOFF tSKEW tjab Vover VRBE +250 Units Conditions note 66.6 MHZ, Measured 2.0V 66.6 MHZ, Measured 0.4V MHZ, Measured 2.0V MHZ, Measured 0.4V Note Note (long term jitter measured over minute period) ohms source inch load Note
VDDq3 VDDq4 3.3V ±5%, VDDq2 2.375V 2.9V,
Note CPUCLK(0:3) measured 1.25 other signals measured 1.5V. Note Ring Back must enter this range. INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571 Rev.1.7 12/18/97 Page
SC672A
Clock/Frequency Generator 440FX w/Pentium Systems
TYPE TB4L BUFFER CHARACTERISTICS CPUCLK(0:3) IOAPIC
Characteristic Pull-Up Current Pull-Up Current Pull-Down Current Pull-Down Current Rise/Fall Time Between Rise/Fall Time Between Symbol IOHmin IOHmax IOLmin IOLmax TRFmax Units Conditions Vout 1.25 Vout Vddq2 0.5V Vout Vout Load Load
VDDq3 VDDq4 3.3V ±5%, VDDq2 2.375V 2.9V,
TYPE TB5L BUFFER CHARACTERISTICS REF(1:2) 48/24
Characteristic Pull-Up Current Pull-Up Current Pull-Down Current Pull-Down Current Rise/Fall Time Between Rise/Fall Time Between Symbol IOHmin IOHmax IOLmin IOLmax TRFmin TRFmax Units Conditions Vout Vout Vdd-0.5V Vout Vout Load Load
VDDq3 VDDq4 3.3V ±5%, VDDQ2 2.375V 2.9V,
TYPE TB4L BUFFER CHARACTERISTICS REF0
Characteristic Pull-Up Current Pull-Up Current Pull-Down Current Pull-Down Current Rise/Fall Time Between Rise/Fall Time Between Symbol IOHmin IOHmax IOLmin IOLmax TRFmin TRFmax Units Conditions Vout Vout Vdd-0.5V Vout Vout Load Load
VDDq3 VDDq4 3.3V ±5%, VDDq2 2.375V 2.9V,
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.7
12/18/97 Page
SC672A
Clock/Frequency Generator 440FX w/Pentium Systems
LAYOUT RECOMMENDATION
Island plane plane
VCC1
IMISC672
10µF
VCC2
10µF
This only layout recommendation best performance lower EMI. designer choose different approach C10, (all 0.1µf) should always used placed close their pins.
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.7
12/18/97 Page
SC672A
Clock/Frequency Generator 440FX w/Pentium Systems
PACKAGE DRAWING DIMENSIONS SSOP OUTLINE DIMENSIONS
INCHES SYMBOL
MILLIMETERS 0.110 0.016 0.092 0.0135 0.010 0.630 0.299 0.410 0.016 0.040 0.100 2.41 0.20 2.24 0.203 0.127 15.75 7.42 10.16 0.25 0.61 2.16 2.59 0.31 2.29 0.254 15.88 7.52 0.635 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 0.400 0.10 0.024 0.085
0.102 0.012 0.090 0.010 0.625 0.296 0.025 0.406 0.013 0.032 0.093
ORDERING INFORMATION
Part Number IMISC672AYB Note:
Marking:
Package Type SSOP
Production Flow Commercial,
ordering part number formed combination device number, device revision, package style, screening shown below.
Example: SC672AYB Date Code,
IMISC672AYB Flow Commercial, Package SSOP Revision Device Number
INTERNATIONAL MICROCIRCUITS, INC. COCHES MILPITAS, 95035. TEL: 408-263-6300. 408-263-6571
Rev.1.7
12/18/97 Page

Clock/Frequency Generator 440FX w/Pentium Systems FREQUENCY TABLE

Top Searches for this datasheet

Other recent searches