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DS32KHZ/DIP-DS32KHZ/DIP.-DS32KHZ/WBGA-DS32KHZN-DS32KHZ-N
32.768kHz Temperature-Compensated Crystal Oscillator
GENERAL DESCRIPTION The DS32kHz is a temperature-compensated crystal
oscillator (TCXO) with an output frequency of 32.768kHz. This device addresses applications
requiring better timekeeping accuracy and can 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 (DS32kHz) and industrial (DS32kHz-N) temperature versions.
APPLICATIONS GPS Receivers
Telematics Network Timing and Synchronization in Servers,
Routers, Hubs, and Switches Automatic Power Meters
PIN CONFIGURATIONS
FEATURES Accurate to ±4 Min/Yr (-40°C to +85°C) Accurate to ±1 Min/Yr (0°C to +40°C) Battery Backup for Continuous Timekeeping VBAT Operating Voltage: 2.7V to 5.5V with VCC Grounded VCC Operating Voltage: 4.5V to 5.5V Operating Temperature Range:
0°C to +70°C (Commercial) -40°C to +85°C (Industrial) No Calibration Required Low-Power Consumption Surface Mountable Using BGA Package UL Recognized
ORDERING INFORMATION
DS32kHz
32.768kHz Temperature-Compensated
DS32kHz
ABSOLUTE MAXIMUM RATINGS Voltage Range on Any Pin Relative to Ground -3.0V to +7.0V
Operating Temperature Range Commercial 0°C to +70°C
Industrial -40°C to +85°CStorage Temperature Range -40°C to +85°C
Soldering Temperature (BGA) See IPC/JEDEC J-STD-020A (2x max) (Note 1)Soldering Temperature, Leads (DIP) 260°C for 10 seconds (Notes 1, 2)
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 the absolute maximum rating conditions for extended periods may affect device.
RECOMMENDED DC OPERATING CONDITIONS (TA = -40°C to +85°C)
DC ELECTRICAL CHARACTERISTICS (Over the operating range, unless otherwise specified.)
Note 1: Post-solder cleaning with water-washing techniques is acceptable, provided that ultrasonic vibration is not used. Such cleaning can damage the crystal.
Note 2: Encapsulated DIP modules can be successfully processed through conventional wave-soldering techniques, as long as the temperature of the crystal contained inside does not exceed +150°C.
Note 3: VBAT must be no greater than 3.3V when the device is used in the dual-supply operating modes.
Note 4: Typical values are at +25°C and 5.0V VCC, 3.0 VBAT, unless otherwise indicated.
Note 5: These parameters are measured under no load conditions.
Note 6: This current is the active mode current sourced from the backup supply/battery.
Note 7: Battery current increases to 450µA (typ) for 122ms (typ) for every 64 seconds. DS32kHz
AC TIMING CHARACTERISTICS (Over the operating range, unless otherwise specified.)
Note 8: These parameters are measured using a 15pF load.
Note 9: Error is measured from the nominal supply voltage of whichever supply is powering the device.
Note 10: After reflow. DS32kHz
TYPICAL OPERATING CHARACTERISTICS (VCC = 3.3V, TA = +25°∞C, unless otherwise noted.)
DS32kHz
PIN DESCRIPTIONS
Figure 1. Delta Time and Frequency vs. Temperature
FUNCTIONAL DESCRIPTION The DS32kHz requires four pins for operation: VCC, GND, VBAT, and 32KHZ OUT. (See Figure 3 for connection schemes.) Power is applied through VCC and GND, while VBAT is used to maintain the 32kHz output in the absence
of power. The output is accurate to ±7.5ppm (±4 min/yr) from –40°C to +85°C and ±2ppm (±1 min/yr) from 0°C to +40°C. The DS32kHz is packaged in a small 36-pin SMD using ball grid array (BGA) technology
with dimensions 0.400" wide, 0.450" long, and 0.124" high. It also is 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.
DS32kHz
Figure 2. Block Diagram OPERATION The DS32kHz module contains a crystal and an IC. While powered, the DS32kHz peridocially measures the temperature and adjusts the crystal load to compensate. The DS32kHz is designed to operate in two modes. In the dual-supply mode, a comparator circuit, powered by VCC,
monitors the relationship between the VCC and VBAT input levels. When VCC drops below a certain level compared to VBAT, the device switches over to VBAT (Figure 3A). This mode uses VCC to conserve the battery connected to VBAT
while VCC is applied.
In the single-supply mode, VCC is grounded and the unit is powered by VBAT. Current consumption is less than that of VCC, because the comparator circuit is unpowered (Figure 3B). Figure 3A shows how the DS32kHz should be connected when using two power supplies. VCC should be between
4.5V and 5.5V and VBAT should be between 2.7V and 3.3V. Figure 3B shows how the DS32kHz can be used when only a single-supply system is available. VCC should be grounded and VBAT should then be held between 2.7V and
5.5V. The VBAT pin should be connected directly to a battery. Figure 3C shows a single supply mode where VCC is held at +5V. See the frequency stability versus operating voltage for information about frequency error versus
supply voltage.
Figure 3. Power-Supply Connections
