500MHZ, JITTER, LVPECL FREQUENCY SYNTHESIZER FEATURES Fully
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ICS8431-11
500MHZ, JITTER, LVPECL FREQUENCY SYNTHESIZER
FEATURES
Fully integrated Differential 3.3V LVPECL output Programmable loop divider generating variety output frequencies. Crystal oscillator interface Spread Spectrum Clocking (SSC) fixed 1/2% modulation environments requiring ultra LVTTL LVCMOS control inputs bypass modes supporting in-circuit testing on-chip functional block characterization 3.3V supply voltage lead SOIC 70°C ambient operating temperature Typical cycle-to-cyle jitter 2.6ps
GENERAL DESCRIPTION
ICS8431-11 general purpose clock frequency synthesizer member HiPerClockSHiPerClockSfamily High Performance Clock Solutions from ICS. operates frequency range 250MHz 500MHz. output frequency programmed using parallel interface, thru configuration logic. Spread spectrum clocking programmed control inputs SSC_CTL0 SSC_CTL1.
BLOCK DIAGRAM
XTAL1 XTAL2
ASSIGNMENT
SSC_CTL SSC_CTL TEST_I/O nP_LOAD VDDI XTAL2 XTAL1 VDDA VDDO FOUT nFOUT
PHASE DETECTOR
FOUT nFOUT
ICS8431-11
TEST_I/O M0:M8 Configuration Logic Control Logic
28-Lead SOIC Package View
nP_LOAD
SSC_CTL0 SSC_CTL1
Preliminary Information presented herein represents product prototyping pre-production. noted characteristics based initial product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves right change circuitry specifications without notice.
8431-11
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REV. FEBRUARY 2001
FUNCTIONAL DESCRIPTION
ICS8431-11 features fully integrated therefore requires external components setting loop bandwidth. 16MHz series-resonant fundamental crystal used input on-chip oscillator. output oscillator divided prior phase detector. With 16MHz crystal this provides 1MHz reference frequency. operates over range 500MHz. output loop divider also applied phase detector. phase detector loop filter force output frequency times reference frequency adjusting control voltage. Note that some values (either high low) will achieve lock. output scaled divider prior being sent LVPECL output buffer. divider provides output duty cycle. programmable features ICS8431-11 support four output operational modes programmable loop divider. four output operational modes spread spectrum clocking (SSC), non-spread spectrum clock test modes controlled SSC_CTL[1:0] pins. loop divider divider programmed using inputs through While nP_LOAD input held LOW, data present M0:M8 transparent M-divider. LOW-to-HIGH transition nP_LOAD, M0:M8 data latched into M-divider further changes M0:M8 inputs will seen M-divider until next transition nP_LOAD. relationship between frequency, crystal frequency loop counter/divider defined follows: fxtal count required values M0:M8 programming shown Table Programmable Frequency Function Table. frequency defined follows: fVCO FOUT fVCO fxtal ICS8431-11 equals Valid values which will achieve lock defined 500.
ICS8431-11
500MHZ, JITTER, LVPECL FREQUENCY SYNTHESIZER
8431-11
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REV. FEBRUARY 2001
ICS8431-11
500MHZ, JITTER, LVPECL FREQUENCY SYNTHESIZER
Type Input Input Input Power Input Output Power Power Output Power Unused Input Power Power Input Power Input Pulldown Pullup Pullup Description divider inputs. Data latched LOW-to-HIGH transistion nP_LOAD input. LVCMOS LVTTL pins interface levels. divider inputs. Data latched LOW-to-HIGH transistion nP_LOAD input. LVCMOS LVTTL pins interface levels. control pins. LVTTL LVCMOS interface levels. Ground core test output. Programmed input bypass mode. Power supply core test output. Ground output. These differential outputs main output drivers synthesizer. They compatible with terminated positive referenced LVPECL logic. Power supply output. connection. Pulldown Reset counter. Forces FOUT low. ground pin. power supply pin. ystal oscillator input. Power supply core. Pulldown divider latch enable input. LVTTL LVCMOS interface levels.
TABLE DESCRIPTIONS
Number Name M0-M6 M7-M8 CTL0, CTL1 TEST nFOUT, FOUT VDDO VDDA XTAL1, XTAL2 VDDI nP_LOAD
TABLE CHARACTERISTICS
Symbol Parameter XTAL1, XTAL2 SSC_CTL0, SSC_CTL1, M0:M8, nP_LOAD Test Conditions Minimum Typical Maximum Units
Input Capacitance
RPULLUP RPULLDOWN
Input Pullup Resistor Input Pulldown Resistor
8431-11
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ICS8431-11
500MHZ, JITTER, LVPECL FREQUENCY SYNTHESIZER
Outputs Operational Modes FOUT, TEST_I/O nFOUT fXTAL fXTAL bypass; Oscillator, oscillator, dividers test mode. NOTE 200MHz Hi-Z Default SSC; Modulation Factor Percent Bypass Mode, Test Input (1MHz Test 200MHz) 200MHz Hi-Z Modulation
TABLE CONTROL INPUT FUNCTION TABLE
Inputs SSC_CTL1 SSC_CTL0 TEST_I/O Source Internal External Disabled Enabled Disabled Disabled
NOTE Used house debug characterization.
TABLE PROGRAMMABLE FREQUENCY FUNCTION TABLE (NOTE
Frequency (MHz) Count
NOTE Assumes 16MHz crystal.
8431-11
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ICS8431-11
500MHZ, JITTER, LVPECL FREQUENCY SYNTHESIZER
4.6V -0.5V 0.5V -0.5V VDDO 0.5V 70°C -65°C 150°C
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Inputs Outputs Ambient Operating Temperature Storage Temperature
Stresses beyond those listed under Absolute Maximum Ratings cause permanent damage device. These ratings stress specifications only functional operation product these condition conditions beyond those listed Characteristics Characteristics implied. Exposure absolute maximum rating conditions extended periods affect product reliability.
TABLE POWER SUPPLY CHARACTERISTICS, VDDA VDDO 3.3V±5%, 70°C
Symbol VDDO VDDA VDDI Parameter Output Power Supply Voltage Output Power Supply Voltage Analog Power Supply Voltage Input Power Supply Voltage Test Conditions Minimum 3.135 3.135 3.135 3.135 Typical Maximum 3.465 3.465 3.465 3.465 Units
TABLE LVCMOS LVTTL CHARACTERISTICS, VDDA VDDO 3.3V±5%, 70°C
Symbol Parameter M0:M8, SSC_CTL0, Input High Voltage SSC_CTL1, TEST_I/O, nP_LOAD M0:M8, SSC_CTL0, Input Voltage SSC_CTL1, TEST_I/O, nP_LOAD SSC_CTL0, SSC_CTL1, TEST_IO Input High Current M0:M6, nP_LOAD, SSC_CTL0, SSC_CTL1, TEST_IO Input Current M0:M6, nP_LOAD, Test Conditions 3.135V 3.465V 3.135V 3.465V 3.465V 3.465V 3.465V, 3.465V, -150 Minimum Typical Maximum 3.765 Units
-0.3
TABLE LVPECL CHARACTERISTICS, VDDA VDDO 3.3V±5%, 70°C
Symbol VSWING Parameter Output High Voltage; NOTE Output Voltage; NOTE Peak-to-Peak Output Voltage Swing Output High Current Test Conditions VDDI VDDO 3.3V VDDI VDDO 3.3V Minimum Typical Maximum Units
Output Current NOTE These values VDDO equal 3.3V. Output levels will vary with VDDO. NOTE Output terminated with VDDO
8431-11
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ICS8431-11
500MHZ, JITTER, LVPECL FREQUENCY SYNTHESIZER
Test Conditions Minimum -100 year @25°C Type Maximum Units
TABLE CRYSTAL CHARACTERISTICS
Parameter ystal Mode Oscillation Frequenc Frequency Tolerance Frequency Stability Drive Level Equivalent Series Resistance (ESR) Shunt Capacitiance Load Capacitiance Series Inductance Operating Temperature Range Aging Fundamental
TABLE CHARACTERISTICS, VDDA VDDO 3.3V±5%, 70°C
Symbol tPERIOD tjit Fxtal tLOCK oscTOL Parameter Output Period; NOTE Peak Jitter (Shor Cycle); NOTE Output Duty Cycle; NOTE Output Rise Time Output Fall Time Crystal Input Range Modulation Frequency Modulation Factor Lock Time Input Pulse Width Setup Time Hold Time nP_LOAD SSC_CTLx nP_LOAD SSC_CTLx nP_LOAD 33.33 Test Conditions FOUT Minimum Typical Maximum Units
Crystal Oscillator Tolerance
NOTE Spread spectrum clocking enabled.
8431-11
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REV. FEBRUARY 2001
ICS8431-11
500MHZ, JITTER, LVPECL FREQUENCY SYNTHESIZER
PACKAGE OUTLINE SUFFIX
SEATING PLANE
(.004)
TABLE PACKAGE DIMENSIONS
Millimeters SYMBOL -0.10 2.05 0.33 0.18 17.70 7.40 2.65 -2.55 0.51 0.32 18.40 7.60 1.27 BASIC 10.00 0.25 0.40 10.65 0.75 1.27 -.0040 .081 .013 .007 .697 .291 .104 -.100 .020 .013 .724 .299 Inches
.050 BASIC .394 .010 .016 .419 .029 .050
REFERENCE DOCUMENT: JEDEC PUBLICATION MS-013, MO-119
8431-11
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REV. FEBRUARY 2001
ICS8431-11
500MHZ, JITTER, LVPECL FREQUENCY SYNTHESIZER
Marking ICS8431AM-11 ICS8431AM-11 Package Lead SOIC Lead SOIC Tape Reel Count Tube 1000 Temperature 70°C 70°C
TABLE ORDERING INFORMATION
Part/Order Number ICS8431AM-11 ICS8431AM-11T
While information presented herein been checked both accuracy reliability, Integrated Circuit Systems, Incorporated (ICS) assumes responsibility either infringement patents other rights third parties, which would result from use. other circuits, patents, licenses implied. This product intended normal commercial applications. other applications such those requiring extended temperature range, high reliability, other extraordinary environmental requirements recommended without additional processing ICS. reserves right change circuitry specifications without notice. does authorize warrant product life support devices critical medical instruments. 8431-11
www.icst.com
REV. FEBRUARY 2001
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