DS76KHZ MAXIM | Alldatasheet
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Technical content
FEATURES
/elevenoclock Accurate to ±7.5 ppm (-40°C to +85°C) /elevenoclock Accurate to ±2 ppm (0°C to 40°C) /elevenoclock Battery back up for continuous output /elevenoclock VBAT operating voltage 2.7 to 5.5 volts (with VCC grounded) /elevenoclock VCC operating voltage 4.5 to 5.5 volts /elevenoclock Operating temperature range: COM: 0°C to 70°C IND: -40°C to +85°C /elevenoclock No calibration required /elevenoclock Low power consumption /elevenoclock Surface mountable VCC: C2, C3, D2, D3 VBAT: A4, A5, B4, B5 76KHz: C4, C5, D4, D5 GND: All Remaining Balls PIN ASSIGNMENT
DESCRIPTION
The DS76KHz is a temperature-compensated crystal oscillator (TCXO) with an output frequency of 76.8 kHz. This device is available in commercial and industrial temperature versions, DS76KHz and DS76KHz-N respectively. The DS76KHz requires four pins for operation: V CC, GND, VBAT and 76KHz OUT. See Figures 1, 2 and 3 for connection schemes. Power is applied via VCC and GND, while VBAT is used to maintain the 76KHz output in the absence of power. The output is accurate to ±7.5 ppm from -40 °C to +85 °C and ±2 ppm from 0°C to 40°C. The DS76KHz is packaged in a small 36-pin SMD, utilizing Ball Grid Array (BGA) technology, with dimensions 0.400 inches wide, 0.450 inches long, and 0.180 inches high. The recommended land pattern layout is shown on page 5. 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 accuracy. DS76KHz 76.8 kHz TCXO PRELIMINARY www.dalsemi.com AB D C DS76KHz 36-Pin SMD (TOP VIEW)
ABSOLUTE MAXIMUM RATINGS* Voltage on Any Pin Relative to Ground -3.0V to +7.0V Operating Temperature 0 °C to 70°C - Commercial -40°C to +85°C - Industrial Storage Temperature -40 °C to +85°C Soldering Temperature +260 °C for 10 seconds (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. The Dallas Semiconductor DS76KHz is built to the highest quality standards and manufactured for long term reliability. All Dallas Semiconductor devices are made using the same quality materials and manufacturing methods. However, the DS76KHz is not exposed to environmental stresses, such as burn-in, that some industrial applications require. For specific reliability information on this product, please contact the factory in Dallas at (972) 371-4448. RECOMMENDED DC OPERATING CONDITIONS (-40°C to +85°C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Power Supply Voltage V CC 4.5 5.0 5.5 V 1 Battery Voltage V BAT 2.7 3.0 3.3, 5.5 V 1, 7 DC ELECTRICAL CHARACTERISTICS (VCC =4.5V to 5.5V; -40°C to +85°C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Active Supply Current I CC 150 180 µA 2, 8 Active Battery Current (VCC =0V, VBAT =3.3V) IBAT 14 µA 3, 8 High Output Voltage IOH=-1.0 mA) VOH 2.4 V 6 Low Output Voltage (IOL =2.1 mA) VOL 0.4 V 6 Battery Switch Voltage V SW VBAT V AC TIMING CHARACTERISTICS (VCC =4.5V to 5.5V; -40°C to +85°C) PARAMETER SYMBOL MIN TYP MAX UNITS NOTES Output Frequency f OUT 76.8 kHz Frequency Stability vs Temp (0°C to 40°C) (-40°C to +85°C) ∆f/fO ±2.0 ±7.5 ±7.5 PPM Frequency Stability vs Operating Voltage ∆f/V ±1.0 ppm/V Duty Cycle T W/T 45 50 55 % Cycle Time t CYC 13.021 µs 4 High/Low Time t H/tL 6.31 µs 4 Rise Time t R 325 ns 4 Fall Time t F 75 ns 4 Oscillator Start-Up Time t OSC 150 ms 4
NOTES: 1. All voltages are referenced to ground. 2. Typical values are at +25°C and nominal supplies. 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. DS76KHz-N is tested over the industrial temperature range to meet the specifications above. 6. These parameters are measured with VCC on under nominal operating conditions. operation, typically 1PPM/Volt above or below 3.0V. 8. These parameters are measured under no load conditions. The difference between ICC and IBAT is due to power switching circuitry. 9. Typical crystal aging is ±1 ppm/yr after reflow. 76KHz OUTPUT WAVEFORM MECHANICAL DIMENSIONS
RECOMMENDED LAND PATTERN LAYOUT (36-Pin BGA)