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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX3624A Datasheet

Precision Clock Generator

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MAX3624A pdf
19-5005; Rev 0; 10/09
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
Low-Jitter, Precision Clock Generator
with Four Outputs
General Description
The MAX3624A is a low-jitter, precision clock generator
optimized for networking applications. The device inte-
grates a crystal oscillator and a phase-locked loop
(PLL) clock multiplier to generate high-frequency clock
outputs for Ethernet, Fibre Channel, SONET/SDH, and
other networking applications.
Maxim’s proprietary PLL design features ultra-low jitter
(0.36psRMS) and excellent power-supply noise rejec-
tion, minimizing design risk for network equipment.
The MAX3624A has three LVPECL outputs and one
LVCMOS output. Selectable output dividers and a
selectable feedback divider allow a range of output
frequencies.
Applications
Ethernet Networking Equipment
Fibre Channel Storage Area Network
SONET/SDH Network
Pin Configuration and Typical Application Circuit appear at
end of data sheet.
IN_SEL
MR
Features
Crystal Oscillator Interface: 19.375MHz to 27MHz
CMOS Input: 19MHz to 40.5MHz
Output Frequencies
Ethernet: 62.5MHz, 125MHz, 156.25MHz,
312.5MHz
Fibre Channel: 106.25MHz, 159.375MHz,
212.5MHz, 318.5MHz
SONET/SDH: 77.76MHz, 155.52MHz, 311.04MHz
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
PIN-PACKAGE
MAX3624AETJ+
-40°C to +85°C
32 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Block Diagram
BYPASS
SELA[1:0]
REF_IN
27pF
X_IN
X_OUT
33pF
SELA[1:0]
SELB[1:0]
FB_SEL[1:0]
BYPASS
RESET LOGIC/POR
RESET
LVCMOS
0
CRYSTAL
OSCILLATOR
1
PFD
DIVIDERS:
M = 16, 24, 25, 32
NA = 1, 2, 3, 4, 5, 6, 8, 10, 12
NB = 1, 2, 3, 4, 5, 6, 8, 10, 12
0
620MHz TO 648MHz
FILTER
VCO
1
RESET
DIVIDER
M
MAX3624A
DIVIDER
NA
RESET
LVCMOS
BUFFER
LVPECL
BUFFER
RESET
DIVIDER
NB
LVPECL
BUFFER
LVPECL
BUFFER
QAC_OE
QA_C
QA_OE
QA
QA
QB1_OE
QB1
QB1
QB0_OE
QB0
QB0
FB_SEL[1:0]
SELB[1:0]
________________________________________________________________ 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 www.maxim-ic.com.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX3624A Datasheet

Precision Clock Generator

No Preview Available !

MAX3624A pdf
www.DataSheet4U.com
Low-Jitter, Precision Clock Generator
with Four Outputs
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Range VCC, VCCA,
VDDO_A, VCCO_A, VCCO_B ................................-0.3V to +4.0V
Voltage Range at REF_IN, IN_SEL,
FB_SEL[1:0], SELA[1:0], SELB[1:0],
QAC_OE, QA_OE, QB0_OE, QB1_OE,
MR, BYPASS ..........................................-0.3V to (VCC + 0.3V)
Voltage Range at X_IN ..........................................-0.3V to +1.2V
Voltage Range at GNDO_A...................................-0.3V to +0.3V
Voltage Range at X_OUT ............................-0.3V to (VCC - 0.6V)
Current into QA_C ...........................................................±50mA
Current into QA, QA, QB0, QB0, QB1, QB1 .....................-56mA
Continuous Power Dissipation (TA = +70°C)
32-Pin TQFN (derate 34.5mW/°C above +70°C) .......2759mW
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 = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = +3.3V, TA = +25°C, unless other-
wise noted.) (Notes 1, 2, and 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP
Power-Supply Current
ICC (Note 4)
82
CONTROL INPUT CHARACTERISTICS
(SELA[1:0], SELB[1:0], FB_SEL[1:0], IN_SEL, QAC_OE, QA_OE, QB1_OE, QB0_OE, MR, BYPASS Pins)
Input Capacitance
Input Pulldown Resistor
Input Logic Bias Resistor
CIN
RPULLDOWN Pins MR, FB_SEL[1:0]
RBIAS Pins SELA[1:0], SELB[1:0], QB0_OE
2
75
50
Input Pullup Resistor
RPULLUP
Pins QAC_OE, QA_OE, QB1_OE, IN_SEL,
BYPASS
75
LVPECL OUTPUT SPECIFICATIONS (QA, QA, QB0, QB0, QB1, QB1 Pins)
Output High Voltage
VOH
VCC -
1.18
VCC -
0.98
Output Low Voltage
VOL
VCC -
1.90
VCC -
1.7
Peak-to-Peak Output-Voltage
Swing (Single-Ended)
(Note 2)
0.6 0.72
Clock Output Rise/Fall Time
Output Duty-Cycle Distortion
20% to 80% (Note 2)
PLL enabled
PLL bypassed (Note 5)
200 350
48 50
45 50
LVCMOS/LVTTL INPUT SPECIFICATIONS
(SELA[1:0], SELB[1:0], FB_SEL[1:0], IN_SEL, QAC_OE, QA_OE, QB1_OE, QB0_OE, MR, BYPASS Pins)
Input-Voltage High
Input-Voltage Low
Input High Current
Input Low Current
VIH
VIL
IIH VIN = VCC
IIL VIN = 0V
2.0
-80
MAX
100
VCC -
0.83
VCC -
1.55
0.9
600
52
55
0.8
80
UNITS
mA
pF
k
k
k
V
V
VP-P
ps
%
V
V
μA
μA
2 _______________________________________________________________________________________


Part Number MAX3624A
Description Precision Clock Generator
Maker Maxim Integrated Products
Total Page 12 Pages
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