Ultra Low Current KX Series Crystal Oscillator 2.5 x 2.0mm KX251 CMOS 32.768kHz 2.5 x 2.0mm Ceramic SMD Package: (Scale: none; Dimensions are in mm) Product Features Recommended Land Pattern: • AT Cut 32.768 kHz XO • CMOS compatible logic levels • Ultra low active current (< 10µA) • Very tight temperature stability • Designed for standard reflow and washing techniques • Pb-free and RoHS/Green compliant CREATED USING CADSTD LITE FREEWARE FROM WWW.CADSTD.COM. NON-COMMERCIAL USE ONLY. Product Description Pin Functions: The KX251 Series real time clock oscillator achieves superb stability over a broad range of operating conditions. It utilizes Pericom proprietary technology to achieve ultra low current less than 10µA. The output clock signal is compatible with LVCMOS/LVTTL logic levels. The device, available on tape and reel, is contained in a 2.5 x 2.0mm surface-mount ceramic package. Pin Function 1 OE Function 2 Ground 3 Clock Output 4 V DD Part Ordering Information: CREATED USING CADSTD LITE FREEWARE FROM WWW.CADSTD.COM. NON-COMMERCIAL USE ONLY. Applications KX 251 V • Real-Time Clock Oscillator where low current and tight stability are needed A Voltage: 1=+3.3V 2=+2.5V 3=+1.8V B=+3.0V I S 032.768000 B C D Stability and Temp Range: Stability Temp Range A = +/-20 ppm -20/+70°C B = +/-25 ppm -20/+70°C C = +/-50 ppm -20/+70°C D = +/-25 ppm -40/+85°C E = +/-50 ppm -40/+85°C F = +/-20 ppm 0/+70°C G = +/-25 ppm 0/+70°C H = +/-25 ppm 0/+85°C I = +/-25 ppm -20/+85°C Z = Reference Design Internal #: Frequency: 0~9 FFF.FFFFFF kHz, “3 digits/decimal/6 digits” format Following the above format, Saronix-eCera part numbers will be assigned upon confirmation of exact customer requirements. SaRonix-eCera™ is a Pericom® Semiconductor company 14-0033 • US: +1-408-435-0800 TW: +886-3-4518888 • www.saronix-ecera.com All specifications are subject to change without notice. KX251 REV C 8/27/2014 1 CMOS 32.768kHz KX251 Ultra Low Current KX Series Crystal Oscillator 2.5 x 2.0mm Electrical Performance Parameter Min. Typ. Output Frequency Max. Units 32.768 Supply Voltage Notes kHz +1.71 +1.8 +1.89 V +2.25 +2.5 +2.75 V +2.85 +3.0 +3.15 V +3.0 +3.3 +3.6 V 10 15 µA At 15pF load Supply Current, Output Enabled See part ordering options Supply Current, Standby Mode 0.5 µA Output Hi-Z Frequency Stability ±50 ppm See part ordering options, and note 1 +85 C 0.1 V DD V Operating Temperature Range -40 Output Logic 0, VOL Output Logic 1, VOH 0.9 V DD V Output Load Duty Cycle 15 pF See Note 2 55 % measured 50% of V DD 50 ns measured 20/80% of V DD 10 ms 45 Rise and Fall Time See part ordering options 35 Start-up time Notes: 1. Stability includes all combinations of operating temperature, load changes, rated input (supply) voltage changes, initial calibration tolerance (25°C), aging (1 year at 25°C average effective ambient temperature), shock and vibration. 2. For specifications othere than those listed, please contact sales. Output Enable / Disable Function Parameter Min. Input Voltage (pin 1), Output Enable Typ. Max. Units 0.7 V DD Input Voltage (pin 1), Output Disable (low power standby) 0.3 V DD Internal Pullup Resistance 100 Notes V or open V Output is Hi-Z kΩ Output Disable Delay 100 ns Output Enable Delay 10 ms Absolute Maximum Ratings Parameter Min. Storage Temperature -55 For the latest product information visit: For test circuit go to: Typ. Max. Units +125 °C Notes http://www.pericom.com/products/timing/oscillators/KX251/ http://www.pericom.com/pdf/sre/tc_hcmos2.pdf For soldering reflow profile and reliability test ratings go to: http://www.pericom.com/pdf/sre/reflow.pdf For tape and reel information go to: http://www.pericom.com/pdf/sre/tr_2520_xo.pdf SaRonix-eCera™ is a Pericom® Semiconductor company 14-0033 • US: +1-408-435-0800 TW: +886-3-4518888 • www.saronix-ecera.com All specifications are subject to change without notice. KX251 REV C 8/27/2014 2