MAX3622CUE+T

MAX3622CUE+T Datasheet

MAX3622

Part	Datasheet
MAX3622CUE+T	MAX3622CUE+T (pdf)

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MAX3622 Low-Jitter, Precision Clock Generator with Two Outputs The MAX3622 is a low-jitter precision clock generator optimized for networking applications. The device integrates a crystal oscillator and a phase-locked loop PLL clock multiplier to generate high-frequency clock outputs for Ethernet and other networking applications. Maxim’s proprietary PLL design features ultra-low jitter 0.36psRMS and excellent power-supply noise rejection, minimizing design risk for network equipment. The MAX3622 has one LVPECL output and one LVCMOS output. It is available in a 16-pin TSSOP package and operates over the 0°C to +70°C temperature range. Ethernet Networking Equipment Typical Application Circuit and Pin Configuration appear at end of data sheet. Crystal Oscillator Interface 25MHz Typical Output Frequencies 125MHz and 156.25MHz Low Jitter 0.14psRMS 1.875MHz to 20MHz 0.36psRMS 12kHz to 20MHz Excellent Power-Supply Noise Rejection No External Loop Filter Capacitor Required Ordering Information PART TEMP RANGE MAX3622CUE+ 0°C to +70°C +Denotes a lead-free package. PINPACKAGE 16 TSSOP PKG CODE U16-2 Block Diagram 27pF X_IN 25MHz X_OUT 33pF MAX3622 RESET LOGIC/POR RESET CRYSTAL OSCILLATOR 625MHz FILTER RESET ÷ 25 ÷5 RESET LVCMOS BUFFER RESET ÷4 LVPECL BUFFER QAC_OE QA_C QB_OE QB Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at MAX3622 Low-Jitter, Precision Clock Generator with Two Outputs ABSOLUTE MAXIMUM RATINGS Supply Voltage Range VCC, VCCA, VDDO_A, VCCO_B to +4.0V Voltage Range at QAC_OE, QB_OE, RES1, RES2 to VCC + 0.3V Voltage Range at X_IN Pin to +1.2V Voltage Range at to +0.3V Voltage Range at X_OUT Pin ......................-0.3V to VCC - 0.6V Current into QA_C Current into QB, Continuous Power Dissipation TA = +70°C 16-Pin TSSOP derate 11.1mW/°C above +70°C .......889mW Operating Junction Temperature Range ...........-55°C to +150°C Storage Temperature Range .............................-65°C to +160°C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS VCC = +3.0V to +3.6V, TA = 0°C to +70°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C, unless otherwise noted. Notes 1, 2 PARAMETER CONDITIONS Power-Supply Current Note 3 CONTROL INPUT CHARACTERISTICS QAC_OE, QB_OE PINS Input Capacitance Input Logic Bias Resistor RBIAS LVPECL OUTPUT SPECIFICATIONS QB, QB PINS Output High Voltage Output Low Voltage Peak-to-Peak Output-Voltage Swing Single-Ended Output Rise/Fall Time 20% to 80% Output Duty-Cycle Distortion LVCMOS/LVTTL INPUT SPECIFICATIONS QAC_OE, QB_OE PINS Input-Voltage High Input-Voltage Low Input High Current VIN = VCC Input Low Current VIN = 0V LVCMOS OUTPUT SPECIFICATIONS QA_C PIN Output High Voltage Output Low Voltage Output Rise/Fall Time VOH QA_C sourcing 12mA VOL QA_C sinking 12mA Note 4 Output Duty-Cycle Distortion Note 4 Output Impedance

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MAX3622

Low-Jitter, Precision Clock Generator with Two Outputs

The MAX3622 is a low-jitter precision clock generator optimized for networking applications. The device integrates a crystal oscillator and a phase-locked loop PLL clock multiplier to generate high-frequency clock outputs for Ethernet and other networking applications. Maxim’s proprietary PLL design features ultra-low jitter 0.36psRMS and excellent power-supply noise rejection, minimizing design risk for network equipment. The MAX3622 has one LVPECL output and one LVCMOS output. It is available in a 16-pin TSSOP package and operates over the 0°C to +70°C temperature range.

Ethernet Networking Equipment

Typical Application Circuit and Pin Configuration appear at end of data sheet.

Crystal Oscillator Interface 25MHz Typical

Output Frequencies 125MHz and 156.25MHz

Low Jitter 0.14psRMS 1.875MHz to 20MHz 0.36psRMS 12kHz to 20MHz

Excellent Power-Supply Noise Rejection

No External Loop Filter Capacitor Required
Ordering Information

PART

TEMP RANGE

MAX3622CUE+ 0°C to +70°C +Denotes a lead-free package.

PINPACKAGE
16 TSSOP

PKG CODE

U16-2

Block Diagram
27pF

X_IN 25MHz

X_OUT 33pF

MAX3622

RESET LOGIC/POR

RESET

CRYSTAL OSCILLATOR
625MHz

FILTER

RESET
÷ 25
÷5 RESET

LVCMOS BUFFER

RESET ÷4

LVPECL BUFFER

QAC_OE QA_C

QB_OE QB

Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at

MAX3622

Low-Jitter, Precision Clock Generator with Two Outputs

ABSOLUTE MAXIMUM RATINGS

Supply Voltage Range VCC, VCCA, VDDO_A, VCCO_B to +4.0V

Voltage Range at QAC_OE, QB_OE, RES1, RES2 to VCC + 0.3V

Voltage Range at X_IN Pin to +1.2V Voltage Range at to +0.3V Voltage Range at X_OUT Pin ......................-0.3V to VCC - 0.6V

Current into QA_C Current into QB, Continuous Power Dissipation TA = +70°C
16-Pin TSSOP derate 11.1mW/°C above +70°C .......889mW Operating Junction Temperature Range ...........-55°C to +150°C Storage Temperature Range .............................-65°C to +160°C

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

ELECTRICAL CHARACTERISTICS

VCC = +3.0V to +3.6V, TA = 0°C to +70°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C, unless otherwise noted. Notes 1, 2

PARAMETER

CONDITIONS

Power-Supply Current

Note 3

CONTROL INPUT CHARACTERISTICS QAC_OE, QB_OE PINS

Input Capacitance

Input Logic Bias Resistor

RBIAS

LVPECL OUTPUT SPECIFICATIONS QB, QB PINS

Output High Voltage

Output Low Voltage

Peak-to-Peak Output-Voltage Swing Single-Ended

Output Rise/Fall Time
20% to 80%

Output Duty-Cycle Distortion

LVCMOS/LVTTL INPUT SPECIFICATIONS QAC_OE, QB_OE PINS

Input-Voltage High

Input-Voltage Low

Input High Current

VIN = VCC

Input Low Current

VIN = 0V

LVCMOS OUTPUT SPECIFICATIONS QA_C PIN

Output High Voltage Output Low Voltage Output Rise/Fall Time

VOH QA_C sourcing 12mA VOL QA_C sinking 12mA

Note 4

Output Duty-Cycle Distortion

Note 4

Output Impedance

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Datasheet ID: MAX3622CUE+T 647306