Document
Integrated Circuit Systems, Inc.
ICS840051I
FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR
FEATURES
• 1 LVCMOS/LVTTL output, 15Ω output impedance • Crystal oscillator interface designed for 18pF parallel resonant crystals • Output frequency range: 70MHz - 170MHz • VCO range: 560MHz - 680MHz • RMS phase jitter at 155.52MHz (1.875MHz - 20MHz): 0.48ps (typical) • RMS phase noise at 155.52MHz Offset Noise Power 100Hz ............... -99.7 dBc/Hz 1KHz ................ -120 dBc/Hz 10KHz ................ -128 dBc/Hz 100KHz ................ -127 dBc/Hz • 3.3V or 2.5V operating supply • -40°C to 85°C ambient operating temperature • Lead-Free fully RoHS compliant
GENERAL DESCRIPTION
The ICS840051I is a Gigabit Ethernet Clock Generator and a member of the HiPerClocksTM HiPerClockS™ family of high performance devices from ICS. The ICS840051I can synthesize 10 Gigabit Ethernet, SONET, or Serial ATA reference clock frequencies with the appropriate choice of crystal and output divider. The ICS840051I has excellent phase jitter performance and is packaged in a small 8-pin TSSOP, making it ideal for use in systems with limited board space. www.DataSheet4U.com
ICS
FREQUENCY TABLE
Inputs Crystal Frequency (MHz) 20.141601 20.141601 19.53125 19.53125 19.44 19.44 18.75 18.75 FREQ_SEL 0 1 0 1 0 1 0 1 Output Frequency (MHz) 161.132812 80.566406 156.25 78.125 155.52 77.76 15 0 75
BLOCK DIAGRAM
OE Pullup FREQ_SEL Pulldown
PIN ASSIGNMENT
VDDA OE XTAL_OUT XTAL_IN Q0 1 2 3 4 8 7 6 5 VDD Q0 GND FREQ_SEL
XTAL_IN
OSC
XTAL_OUT
Phase Detector
VCO
560MHz-680MHz
0 ÷4 (default) 1 ÷8
ICS840051I
8-Lead TSSOP 4.40mm x 3.0mm x 0.925mm package body G Package Top View
÷32 (fixed)
840051AGI
www.icst.com/products/hiperclocks.html
1
REV. A JANUARY 14, 2005
Integrated Circuit Systems, Inc.
ICS840051I
FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR
Type Power Input Input Input Power Description
TABLE 1. PIN DESCRIPTIONS
Number 1 2 3, 4 5
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Name VDDA OE XTAL_OUT, XTAL_IN FREQ_SEL GND Q0 VDD
Analog supply pin. Output enable pin. When HIGH, Q0 output is enabled. When LOW, Pullup forces Q0 to HiZ state. LVCMOS/LVTTL interface levels. See Table 3A. Crystal oscillator interface. XTAL_IN is the input, XTAL_OUT is the output. Pulldown Frequency select pin. LVCMOS/LVTTL interface levels. See Table 3B. Power supply ground. Single-ended clock output. LVCMOS/LVTTL interface levels. 15Ω output impedance. Core supply pin.
6
7 8
Output Power
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol CIN CPD RPULLUP RPULLDOWN ROUT Parameter Input Capacitance Power Dissipation Capacitance Input Pullup Resistor Input Pulldown Resistor Output Impedance VDD, VDDA = 3.465V VDD, VDDA = 2.625V Test Conditions Minimum Typical 4 7 7 51 51 15 Maximum Units pF pF pF KΩ KΩ Ω
TABLE 3A. CONTROL FUNCTION TABLE
Control Input OE 0 1 Output Q0 Hi-Z Active
TABLE 3B. FREQ_SEL FUNCTION TABLE
Control Input FRE_SEL 0 1 N Divider ÷4 (default) ÷8
840051AGI
www.icst.com/products/hiperclocks.html
2
REV. A JANUARY 14, 2005
Integrated Circuit Systems, Inc.
ICS840051I
FEMTOCLOCKS™ CRYSTAL-TOLVCMOS/LVTTL CLOCK GENERATOR
4.6V -0.5V to VDD + 0.5 V -0.5V to VDD + 0.5V 101.7°C/W (0 mps) -65°C to 150°C NOTE: 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, VDD Inputs, VI Outputs, VO Package Thermal Impedance, θJA Storage Temperature, TSTG
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TABLE 4A. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDA = 3.3V±5%, TA = -40°C TO 85°C
Symbol VDD VDDA IDD IDDA Parameter Core Supply Voltage Analog Supply Voltage Power Supply Current Analog Supply Current Test Conditions Minimum 3.135 3.135 Typical 3.3 3.3 Maximum 3.465 3.465 60 10 Units V V mA mA
TABLE 4B. POWER SUPPLY DC CHARACTERISTICS, VDD = VDDA = 2.5V±5%, TA = -40°C TO 85°C
Symbol VDD VDDA IDD IDDA Parameter Core Supply Voltage Analog Supply Voltage Power Supply Current Analog Supply Current Test Conditions Minimum 2.375 2.375 Typical 2.5 2.5 Maximum 2.625 2.625 55 10 Units V V mA mA
TABLE 4C. LVCMOS/LVTTL DC CHARACTERISTICS, VDD = VDDA = 3.3V±5%, TA = -40°C TO 85°C
Symbol VIH VIL IIH IIL VOH Parameter Input High Voltage Input Low Voltage Input High Current Input Low Current FREQ_SEL OE FREQ_SEL OE VDD = VIN = 3.465V or 2.625V VDD = VIN = 3.465V or 2.625V VDD = 3.465V or 2.625V, VIN = 0V VDD = 3.465V or 2.625V, VIN = 0V VDD = 3.465V VDD = 2.625V -5 -150 2.6 1.8 0.5 Test Conditions Minimum 2 -0.3 Typical Maximum VDD + 0.3 0.8 150 5 Units V V µA µA µA µA V V V
Output High Voltage; NOTE 1
VOL Output Low Volt.