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Part: ICS843021AG
Category:
Timing Circuits
-> Clock Generators
Description: Femtoclocks CRYSTAL-TO-<<<>>>3.3V Lvpecl Clock Generator.<<<>>>the ICS843021 is a Fibre Channel Clock Generator<<<>>>and a Member of The Hiperclockstm Family of High<<<>>>performance Devices From Ics. The ICS843021<<<>>>uses a 25MHz Crystal to Synthesize 125MHz. The<<<>>>ICS843021 Has Excellent Phase Jitter Performance,<<<>>>over The 12KHz 20MHz Integration Range. The ICS843021 Is<<<>>>packaged in a Small 8-pin Tssop, Making it Ideal For Use In<<<>>>systems With Limited Board Space.<<<>>>FEATURES<<<>>> 1 Differential 3.3V Lvpecl Output<<<>>> Crystal Oscillator Interface Designed For 25MHz,<<<>>>18pF Parallel Resonant Crystal<<<>>> Output Frequency: 125MHz<<<>>> RMS Phase Jitter @ 125MHz, Using a 25MHz Crystal<<<>>>(12KHz - 20MHz): 1.04ps (typical)<<<>>> RMS Phase Noise at 125MHz (design Target)<<<>>>phase Noise:<<<>>>offset Noise Power<<<>>>100Hz ............... -91.3 DBc/Hz<<<>>>1KHz ..............-115.5 DBc/Hz<<<>>>10KHz ..............-130.0 DBc/Hz<<<>>>100KHz ..............-130.9 Dbc/hz
Company: Integrated Circuit System
Datasheet: Download ICS843021AG datasheet File size : 392 kB
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Datasheet text preview:
PRELIMINARY
Integrated Circuit Systems, Inc.
ICS843021
FEMTOCLOCKSTM CRYSTAL-TO3.3V LVPECL CLOCK GENERATOR
FEATURES
· 1 differential 3.3V LVPECL output · Crystal oscillator interface designed for 25MHz, 18pF parallel resonant crystal · Output frequency: 125MHz · RMS phase jitter @ 125MHz, using a 25MHz crystal (12KHz - 20MHz): 1.04ps (typical) · RMS phase noise at 125MHz (design target) Phase noise: Offset Noise Power 100Hz ...... -91.3 dBc/Hz 1KHz ..... -115.5 dBc/Hz 10KHz ..... -130.0 dBc/Hz 100KHz ..... -130.9 dBc/Hz · 3.3V operating supply · 0°C to 70°C ambient operating temperature · Industrial temperature information available upon request
GENERAL DESCRIPTION
The ICS843021 is a Fibre Channel Clock Generator and a member of the HiPerClocksTM family of high H iPer Cl ockSTM perfor mance devices from ICS. The ICS843021 uses a 25MHz crystal to synthesize 125MHz. The ICS843021 has excellent phase jitter performance, over the 12KHz 20MHz integration range. The ICS843021 is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space.
ICS
BLOCK DIAGRAM
PIN ASSIGNMENT
VCCA VEE X TA L 2 X TA L 1 1 2 3 4 8 7 6 5 VC C Q0 nQ0 nc
X TA L 1
OSC
X TA L 2
Output Divider
nQ0 Q0
ICS843021
8-Lead TSSOP 4.40mm x 3.0mm x 0.925mm package body G Package Top View
The Preliminary Information presented herein represents a product in prototyping or pre-production. The noted characteristics are based on initial product characterization. Integrated Circuit Systems, Incorporated (ICS) reserves the right to change any circuitry or specifications without notice. 843021AG www.icst.com/products/hiperclocks.html REV. A MARCH 22, 2004
1
PRELIMINARY
Integrated Circuit Systems, Inc.
ICS843021
FEMTOCLOCKSTM CRYSTAL-TO3.3V LVPECL CLOCK GENERATOR
Type Power Power Input Description Analog supply pin. Negative supply pin. Crystal oscillator interface. XTAL1 is the input, XTAL2 is the output. No connect. Differential clock outputs. LVPECL interface levels. Core supply pin.
TABLE 1. PIN DESCRIPTIONS
Number 1 2 3, 4 5 6, 7 8 Name VCCA V EE XTAL2, XTAL1 nc nQ0, Q0 VCC
Unused Output Power
TABLE 2. PIN CHARACTERISTICS
Symbol CIN Parameter Input Capacitance Test Conditions Minimum Typical 4 Maximum Units pF
843021AG
www.icst.com/products/hiperclocks.html
2
REV. A MARCH 22, 2004
PRELIMINARY
Integrated Circuit Systems, Inc.
ICS843021
FEMTOCLOCKSTM CRYSTAL-TO3.3V LVPECL CLOCK GENERATOR
4.6V -0.5V to VCC + 0.5V 50mA 100mA 101.7°C/W (0 lfpm) -65°C to 150°C N OT E : Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only. Functional operation of product at these conditions or any conditions beyond those listed in the DC Characteristics or AC Characteristics is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VCC Inputs, VI Outputs, IO Continuous Current Surge Current Package Thermal Impedance, JA Storage Temperature, TSTG
TABLE 3A. POWER SUPPLY DC CHARACTERISTICS, VCC = 3.3V±5%, TA=0°C TO 70°C
Symbol VCC VCCA I EE Parameter Core Supply Voltage Analog Supply Voltage Power Supply Current Test Conditions Minimum 3.135 3.135 Typical 3.3 3.3 TBD Maximum 3.465 3.465 Units V V mA
TABLE 3B. LVPECL DC CHARACTERISTICS, VCC = 3.3V±5%, TA=0°C TO 70°C
Symbol VOH VOL VSWING Parameter Output High Voltage; NOTE 1 Output Low Voltage; NOTE 1 Peak-to-Peak Output Voltage Swing Test Conditions Minimum VCC - 1.4 VCC - 2.0 0.6 Typical Maximum VCC - 0.9 VCC - 1.7 1.0 Units V V V
NOTE 1: Outputs terminated with 50 to VCC - 2V.
TABLE 4. CRYSTAL CHARACTERISTICS
Parameter Mode of Oscillation Frequency Equivalent Series Resistance (ESR) Shunt Capacitance Test Conditions Minimum Typical Fundamental 25 50 7 MHz pF Maximum Units
TABLE 5. AC CHARACTERISTICS, VCC = 3.3V±5%, TA=0°C TO 70°C
Symbol fOUT Parameter Output Frequency RMS Phase Jitter; NOTE 1 Output Rise/Fall Time 125MHz 20% to 80% Test Conditions Minimum Typical 125 1.04 400 50 Maximum Units MHz ps ps %
tjit(Ø)
tR / tF
odc Output Duty Cycle NOTE 1: Please refer to the Phase Noise Plot.
843021AG
www.icst.com/products/hiperclocks.html
3
REV. A MARCH 22, 2004
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