DS32kHz kHz TCXO
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- Beverley Copeland
- 5 years ago
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1 FEATURES Accurate to 4 Min/Yr (-40 C to +85 C) Accurate to 1 Min/Yr (0 C to 40 C) Battery back up for continuous time keeping V BAT operating voltage 2.7V to 5.5V with V CC grounded V CC operating voltage 4.5V to 5.5V Operating temperature range: COM: 0 C to 70 C IND: -40 C to +85 C No calibration required Low power consumption Surface mountable using BGA package V CC : C2, C3, D2, D3 V BAT : A4, A5, B4, B5 32kHz:C4, C5, D4, D5 GND: All Remaining Balls ORDERING INFORMATION Part Number Package Temp. Range DS32KHZ/BGA 36-pin BGA Commercial DS32KHZN/BGA 36-pin BGA Industrial DS32KHZ/DIP 14-pin DIP Commercial DS32KHZN/DIP 14-pin DIP Industrial PIN ASSIGNMENT kHz TCXO A B C D 36-Pin SMD (Top View) DESCRIPTION The is a temperature compensated crystal oscillator (TCXO) with an output frequency of kHz. This device addresses applications requiring better timekeeping accuracy and may be used to drive the X1 input of most Dallas Semiconductor real-time clocks (RTCs), chipsets and other ICs containing RTCs. This device is available in commercial and industrial temperature versions, and -N respectively. The requires four pins for operation: V CC, GND, V BAT, and 32kHz OUT. See Figures 1, 2, and 3 for connection schemes. Power is applied via V CC and GND, while V BAT is used to maintain the 32kHz output in the absence of power. The output is accurate to 7.5 ppm ( 4 min/yr) from -40 C to +85 C and 2 ppm ( 1 min/yr) from 0 C to 40 C GND V BAT Pin DIP Module (300-mil) V CC 32kHz OUT GND GND 1 of
2 The is packaged in a small 36-pin SMD, utilizing ball grid array (BGA) technology, with dimensions inches wide, inches long, and inches high. Also available in a 14-pin DIP module. The additional board space required is negligible in most applications and therefore the recommended land pattern layout should be implemented on all new designs and future board revisions to satisfy applications requiring better timekeeping accuracy. DELTA TIME AND FREQUEY vs. TEMPERATURE DELTA TIME (MIN/YR) BLOCK DIAGRAM OPERATION The module contains a crystal and an IC. While powered, the peridocially measures the temperature and adjusts the crystal load to compensate. The is designed to operate in two modes. In the two supply mode, a comparitor circuit, powered by V CC, monitors the relationship between the V CC and V BAT input levels. When V CC drops below a certain level compared to V BAT, the device switches over to V BAT. See Figure 1.0. In the single supply mode, V CC is grounded, and the unit is powered by V BAT. Current consumption is less than that of V CC, because the supply monitory and switching circuitry is unpowered. See Figure of 8
3 POWER SUPPLY CONNECTIONS Figure 1.0 shows how the should be connected when using two power supplies. V CC should be between 4.5 and 5.5 volts while V BAT should be between 2.7 and 3.3 volts. Figure 2.0 shows how the can be used when only a single supply system is available. V CC should be grounded and V BAT should then be held between 2.7 and 5.5 volts. The V BAT pin should be connected directly to a battery using no external components. CONNECTIONS Figure 3.0 R1 1M C1 100pF Figure 4.0 Figure 3.0 illustrates how a standard kHz crystal and the should be connected to address the interchangeable option. Using this connection scheme and the recommended layout provides a solution, which requires no hardware modifications. Only one device should be used at a time and both layouts should be located very close together if the recommended layout is not used. 3 of 8
4 The DS32KHz I CC and I BAT currents are specified with no output loads. Many RTC oscillator circuits are designed to be used with a quartz crystal or resonator. Driving the oscillator circuit with the rail-to-rail output of the may increase the I CC and I BAT currents significantly, and increase the current consumption of the RTC as well. Figure 4 shows one recommended circuit that can be used to reduce the current consumption of a and an RTC. The values of R1 and C1 will vary depending on the RTC used. However, values of 1.0M and 100pF are recommended as a starting point. RELATED APPLICATION NOTES: Application Note 58 Crystal Considerations with Dallas Real-Time Clocks Application Note 701 Using the with Dallas RTCs RECOMMENDED DC OPERATING CONDITIONS (-40 C to +85 C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Power Supply Voltage V CC V Battery Voltage V BAT , 5.5 V 1 DC ELECTRICAL CHARACTERISTICS (Over the Operating Range) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Active Supply Current I CC A 2, 5 Active Battery Current (V CC =0V, V BAT =3.3V) I BAT 1 4 A 2,3,5 High Output Voltage (V CC ) (I OH =-1.0mA) V OH 2.4 V Low Output Voltage (I OL =2.1mA) V OL 0.4 V Battery Switch Voltage V SW V BAT V High Output Voltage (V BAT ) (I OH =-0.1mA) V OH 2.4 V 4 of 8
5 ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground Operating Temperature Storage Temperature Soldering Temperature -3.0V to +7.0V 0 C to 70 C (Commercial) -40 C to +85 C (Industrial) -40 C to +85 C See J-STD-020A specification (2 times max.) This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. AC TIMING CHARACTERISTICS (Over the Operating Range) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Output Frequency f OUT khz Frequency Stability vs Temp (0 C to 40 C) f/f O ppm (-40 C to +85 C) -7.5 Duty Cycle T W /T % Cycle Time t CYC s 4 High/Low Time t H /t L s 4 Rise Time t R 200 ns 4 Fall Time t F 60 ns 4 Oscillator Start-Up Time t OSC 150 ms 4 Frequency Stability vs Operating Voltage (3.3V Nom) f/ V 1.0 ppm/ V Crystal Aging f/f O 1.0 ppm/yr 6 NOTES: 1. V BAT must be no greater than 3.3v when the device is used in the two supply operating modes. 2. Typical values are at +25 C and SV V CC unless otherwise indicated. 3. This current is the active mode current sourced from the backup supply/battery. 4. These parameters are measured using a 15 pf load. 5. These parameters are measured under no load conditions. 6. After reflow. 5 of 8
6 32kHZ OUTPUT WAVEFORM MECHANICAL DIMENSIONS 0 6 of 8
7 RECOMMENDED LAND PATTERN LAYOUT (36-Pin BGA) 32 7 of 8
8 14-PIN DIP MODULE NOTE: PINS 2, 3 ARE MISSING BY DESIGN. PKG 14-PIN DIP DIM MIN MAX A IN B IN C IN D IN E IN F IN G IN H IN J IN K IN of 8
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Rev ; 5/7 1MHz to 13MHz Spread-Spectrum General Description The is a spread-spectrum clock modulator IC that reduces EMI in high-clock, frequency-based, digital electronic equipment. Using an integrated
DS1135L 3V 3-in-1 High-Speed Silicon Delay Line
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RFPT Specifications. SMD Low Acceleration Sensitivity TCXO / TCVCXO. Product description. Applications
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CARDINAL COMPONENTS, INC. The Cardinal Cappuccino Crystal Oscillator CMOS TCXO 10MHz - 250MHz
SERIES CJTA The Cardinal Cappuccino Crystal Oscillator CMOS TCXO 10MHz - 250MHz Features 3.3V supply voltage- configurable 10MHz to 250MHz CMOS outputsconfigurable Better than 2Hz tuning resolution Low
Low Phase Noise, LVPECL VCXO (for 150MHz to 160MHz Fundamental Crystals) FEATURES. * Internal 60KΩ pull-up resistor
0.952mm VDD QB PL586-55/-58 FEATURES DIE CONFIGURATION Advanced non multiplier VCXO Design for High Performance Crystal Oscillators Input/Output Range: 150MHz to 160MHz Phase Noise Optimized for 155.52MHz:
TLE4916-1K. Datasheet. Sense & Control. Low Power Automotive Hall Switch. Rev.1.0,
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VTC4 series Voltage Controlled Temperature Compensated Crystal Oscillator
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VC-801 CMOS Crystal Oscillator Previous Vectron Model VCC4
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SEMICONDUCTOR FAC1509 TECHNICAL DATA. 2A 150KHZ PWM Buck DC/DC Converter. General Description. Features. Applications. Package Types DIP8 SOP8
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TOP VIEW WDS1 WDS2. Maxim Integrated Products 1
9-3896; Rev ; /06 System Monitoring Oscillator with General Description The replace ceramic resonators, crystals, and supervisory functions for microcontrollers in 3.3V and 5V applications. The provide
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PT7C4502 PLL Clock Multiplier
Features Low cost frequency multiplier Zero ppm multiplication error Input crystal frequency of 5-30 MHz Input clock frequency of 4-50 MHz Output clock frequencies up to 180 MHz Period jitter 50ps (100~180MHz)
DS1270W 3.3V 16Mb Nonvolatile SRAM
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