DS32kHz temperature-compensated crystal oscillator (TCXO) with output

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DS32kHz temperature-compensated crystal oscillator (TCXO) with output

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DS32kHz 32.768kHz Temperature-Compensated Crystal Oscillator
DS32kHz temperature-compensated crystal oscillator (TCXO) with output frequency 32.768kHz. This device addresses applications requiring better timekeeping accuracy, used drive input most Dallas Semiconductor real-time clocks (RTCs), chipsets, other containing RTCs. This device available commercial (DS32kHz) industrial (DS32kHz-N) temperature versions.
FEATURES
Accurate Minutes/Year (-40°C +85°C) Accurate Minute/Year (0°C +40°C) Battery Backup Continuous Timekeeping VBAT Operating Voltage: 2.7V 5.5V with Grounded Operating Voltage: 4.5V 5.5V Operating Temperature Range: +70°C (Commercial) -40°C +85°C (Industrial) Calibration Required Low-Power Consumption Surface Mountable Using Package Recognized
APPLICATIONS
Receivers Telematics Network Timing Synchronization Servers, Routers, Hubs, Switches Automatic Power Meters
ORDERING INFORMATION
PART
DS32KHZ/DIP DS32KHZN/DIP DS32KHZS DS32KHZS# DS32KHZSN DS32KHZSN# DS32KHZ/WBGA DS32KHZN/WBGA
TEMP RANGE
PINPACKAGE
(0.300") (0.300") (0.300") (0.300")
MARK*
DS32KHZ DS32KHZ-N DS32KHZS DS32KHZS DS32KHZSN DS32KHZSN DS32KHZ DS32KHZ-N
#Denotes RoHS-compliant device that include lead that exempt under RoHS requirements. lead finish JESD97 category compatible with both lead-based lead-free soldering processes. anywhere mark denotes RoHS-compliant device. denotes industrial device.
CONFIGURATIONS
REV: 080607
DS32kHz
ABSOLUTE MAXIMUM RATINGS
Voltage Range Relative Ground.-3.0V +7.0V Operating Temperature Range (Noncondensing) Commercial:.0°C +70°C Industrial:.-40°C +85°C Storage Temperature Range.-40°C +85°C Soldering Temperature (BGA, SO).See Handling, Board Layout, Assembly section. Soldering Temperature, Leads (DIP).+260°C seconds (Note
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
RECOMMENDED OPERATING CONDITIONS
-40°C +85°C) (Note PARAMETER Power-Supply Voltage Battery Voltage SYMBOL VBAT CONDITIONS (Note (Notes 3.5, UNITS
ELECTRICAL CHARACTERISTICS
(Over operating range, unless otherwise specified.) (Note PARAMETER Active Supply Current Battery Input-Leakage Current High Output Voltage (VCC) Output Voltage High Output Voltage (VBAT) Battery Switch Voltage SYMBOL IBATLKG CONDITIONS VBAT 2.7V VBAT 3.5V (Notes -1.0mA (Note 2.1mA (Note -0.1mA (Note (Note VBAT UNITS
(VCC -40°C +85°C.) (Note PARAMETER Active Battery Current Battery Current During Temperature Measurement
Note Note Note Note Note Note Note
SYMBOL IBAT IBATCNV
CONDITIONS VBAT 3.3V (Notes VBAT 3.3V (Notes
UNITS
Limits -40°C guaranteed design production tested. voltages referenced ground. VBAT must greater than 3.5V when device used dual-supply operating modes. Typical values +25°C 5.0V VCC, VBAT, unless otherwise indicated. These parameters measured under output load conditions. This current active-mode current sourced from backup supply/battery. temperature conversion lasts 122ms (typ) occurs power-up then once every seconds.
DS32kHz
TIMING CHARACTERISTICS
(Over operating range, unless otherwise specified.) PARAMETER Output Frequency Frequency Stability Temperature Duty Cycle Cycle Time High/Low Time Rise Time Fall Time Oscillator Startup Time Frequency Stability Operating Voltage Crystal Aging (First Year)
Note Note Note
SYMBOL fOUT f/fO tW/t tCYC tH/tL tOSC f/fO
CONDITIONS
32.768
UNITS
+40°C -40°C +85°C +70°C (Note (Note (Note (Note (Note 5.0V VBAT 3.0V, (Notes (Notes
-2.0 -7.5 30.518 15.06 +2.5 ±1.0
+2.0 +7.5 seconds ppm/V
These parameters measured using 15pF load. Error measured from nominal supply voltage whichever supply powering device. After reflow.
Figure DS32kHz Output Waveform
DS32kHz
TYPICAL OPERATING CHARACTERISTICS
(VCC 3.3V, +25°C, unless otherwise noted.)
IBAT versus VBAT
SUPPLY CURRENT (uA) SUPPLY CURRENT (uA) VBAT 4.50
versus
4.75
5.00
5.25
5.50
15.0
IBAT VBAT output load
47pF
Frequency Deviation Versus Supply Voltage
12.5
SUPPLY CURRENT (uA) 10.0 Deviation
22pF
10pF
VBAT
Supply Voltage
DS32kHz
DESCRIPTION
NAME 3-12, remaining balls 6-11, 32kHz N.C. VBAT 32.768kHz Push-Pull Output Primary Power Supply Connection (Must grounded) Ground Nominal Supply Input. Used operate device when absent. FUNCTION
Figure Delta Time Frequency Temperature
Crystal +20ppm
Typical Crystal, Uncompensated
Delta Frequency (ppm) -100 -120 -140 -160 -180 -200
Crystal -20ppm
-100 Temperature (°C)
FUNCTIONAL DESCRIPTION
DS32kHz temperature-compensated crystal oscillator (TCXO) that outputs 32,768Hz square wave. While DS32kHz powered either supply input, device measures temperature every seconds adjusts output frequency. device requires four pins operation: VCC, GND, VBAT, 32kHz. (See Figure connection schemes.) Power applied through GND, while VBAT used maintain 32kHz output absence power. Once every seconds, DS32kHz measures temperature adjusts output frequency. output accurate ±2ppm min/yr) from +40°C ±7.5ppm min/year) from -40°C from +40°C +85°C.
Delta Time (Min/Year)
DS32kHz Accuracy Band
DS32kHz DS32kHz packaged 36-pin ball grid array (BGA). also available 16-pin 0.300" 14-pin encapsulated (EDIP) module. additional board space required DS32kHz option driving negligible many applications (see Figure Therefore, adding DS32kHz designs future board revisions allows DS32kHz where applications require improved timekeeping accuracy.
Figure Block Diagram
Dallas Semiconductor DS32kHz
Temperature Measurement VBAT
Power Control
Power Switching Circuit
32.768kHz
OPERATION
DS32kHz module contains quartz tuning-fork crystal When power first applied, when device switches between supplies, DS32kHz measures temperature adjusts crystal load compensate frequency. power supply must remain valid level whenever temperature measurement made, including when first applied. While powered, DS32kHz measures temperature once every seconds adjusts crystal load. DS32kHz designed operate modes. dual-supply mode, comparator circuit, powered VCC, monitors relationship between VBAT input levels. When drops below certain level compared VBAT, device switches over VBAT (Figure 4A). This mode uses conserve battery connected VBAT while applied. single-supply mode, grounded unit powered VBAT. Current consumption less than VCC, because comparator circuit unpowered (Figure 4B). Figure shows DS32kHz should connected when using power supplies. should between 4.5V 5.5V, VBAT should between 2.7V 3.5V. Figure shows DS32kHz used when only single-supply system available. should grounded VBAT should then held between 2.7V 5.5V. VBAT should connected directly battery. Figure shows single-supply mode where held +5V. frequency stability operating voltage information about frequency error supply voltage.
DS32kHz
Figure Power-Supply Connections
4.5V 5.5V 2.7V 3.3V Vbat 32.768kHz 2.7V 5.5V Vbat 32.768kHz Vbat 4.5V 5.5V 32.768kHz
Figure illustrates standard 32.768kHz crystal DS32kHz should connected address interchangeable option. Using this connection scheme recommended layout provides solution, which requires hardware modifications. Only device should used time, both layouts should located very close together recommended layout used. DS32kHz IBAT currents specified with output loads. Many oscillator circuits quartz crystal resonator. Driving oscillator circuit with rail-to-rail output DS32kHz increase IBAT currents significantly increase current consumption well. Figure shows circuit that used reduce current consumption DS32kHz RTC. values vary depending used. However, values 1.0M 100pF recommended starting point. used shift input waveform proper level. recommended value 33k.
Figure DS32kHz Connections
32kHz 32.768
VBAT
DS32kHz
Xout
VBAT
board laid that either DS32kHz crystal
Figure DS32kHz Connections
100pF VBAT
VBAT
DS32kHz
DS32kHz
RELATED APPLICATION NOTES
www.maxim-ic.com/RTCapps find these application notes more.) Application Note Crystal Considerations with Dallas Real-Time Clocks Application Note 701: Using DS32kHz with Dallas RTCs
HANDLING, BOARD LAYOUT, ASSEMBLY
These packages contain quartz tuning-fork crystal. Pick-and-place equipment used, precautions should taken ensure that excessive shocks avoided. Ultrasonic cleaning should avoided prevent damage crystal. Avoid running signal traces under package, unless ground plane placed between package signal line. N.C. connect) pins must connected ground. package reflowed long peak temperature does exceed +225°C. Peak reflow temperature 220°C) duration should exceed seconds, total time above 200°C should exceed seconds seconds nominal). package, refer IPC/JEDEC J-STD-020 specification reflow profiles. Exposure reflow limited times maximum. package wave-soldered, provided that internal crystal exposed temperatures above +150°C. Moisture sensitive packages shipped from factory dry-packed. Handling instructions listed package label must followed prevent damage during reflow. Refer IPC/JEDEC J-STD-020 standard moisturesensitive device (MSD) classifications.
THERMAL INFORMATION
PACKAGE TYPE 16-pin (300 mils) 36-pin THETA-JA (°C/W) 43.9 THETA-JC (°C/W) 18.4
PACKAGE INFORMATION
(For latest package information,
PACKAGE TYPE 14-pin Encapsulated 16-pin (300 mils) 36-pin
DOCUMENT 56-G0001-002 56-G4009-001 56-G6023-001
Maxim/Dallas Semiconductor cannot assume responsibility circuitry other than circuitry entirely embodied Maxim/Dallas Semiconductor product. circuit patent licenses implied. Maxim/Dallas Semiconductor reserves right change circuitry specifications without notice time.
Maxim Integrated Products, Gabriel Drive, Sunnyvale, 94086 408-737-7600
2007 Maxim Integrated Products
Maxim logo registered trademark Maxim Integrated Products, Inc. Dallas logo registered trademark Dallas Semiconductor Corporation.

DS32kHz temperature-compensated crystal oscillator (TCXO) with output

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