EM MICROELECTRONIC - MARIN SA EM7604 Low Power Crystal Oscillator Circuit 32.768 kHz Description Features EM7604 is an advanced low power CMOS circuit intended to be used together with a 32.768 kHz tuning fork crystal as a low frequency clock oscillator. Except the crystal, no other external components are required. The device combines excellent oscillator stability with very low power consumption. It is guaranteed over a very wide supply voltage and temperature range. In order to achieve a high frequency accuracy, the matched crystals should have a ± 20ppm tolerance or tighter. The output frequency is synchronized with signal on input Clock Enable CLKEN. The frequency output CLKOUT is enabled by connecting Clock Enable pin CLKEN to VDD. Connecting CLKEN to Vss, disables the frequency and the output CLKOUT is at Low State. Offered in a small SOT23-6 package, the EM7604 is a completely lead free product. Very low power consumption: typ. 300nA Wide supply voltage range: 1.2V to 5.5V Operating temperature range: -10°C to +85°C. On chip integrated oscillation capacitors: CL = 8pF Very tight frequency tolerance Excellent oscillator stability: 0.2 ppm/V Synchronised output after Enable/Disable Compatibility with crystals having high series resistance Small SOT23-6 package 100% lead free, RoHS - compliant Typical Applications General purpose clock generator for digital systems Clock drivers for Real Time Clocks Timekeeping in network servers and computers Data logger Electricity, gas and water metering Portable field communication Mobile phone Solution for problems with embedded quartz oscillators Pin Connection Top View Block Diagram VDD SOT23 OSCOUT 1 6 CLKOUT VSS 2 5 VDD OSCIN 3 4 CLKEN REGULATION OSCILLATOR CLKEN Pin Connection Assignment 1 OSCOUT Oscillator Output 2 VSS Negative Supply Voltage 3 OSCIN Oscillator Input 4 CLKEN Output Enable 5 VDD Positive Supply Voltage 6 CLKOUT Frequency Output Copyright 2013, EM Microelectronic-Marin SA 7604-DS.doc, Version 2.0, 17-Dec-13 OUTPUT CONTROL CLKOUT VSS 1 www.emmicroelectronic.com 420005-A01, 2.0 EM7604 Absolute Maximum Ratings Parameter Voltage at VDD to VSS Minimum voltage Maximum voltage Storage temperature range Maximum soldering Handling Procedures This device has built-in protection against high static voltages or electric fields; however, anti-static precautions must be taken as for any other CMOS component. Unless otherwise specified, proper operation can only occur when all terminal voltages are kept within the voltage range. Unused inputs must always be tied to a defined logic voltage level. Symbol Conditions VDD -0.3V to +6V VMIN VSS – 0.3V VMAX VDD + 0.3V TSTG -55°C to +150°C TSmax 260°C x 20s Stresses above these listed maximum ratings may cause permanent damages to the device. Exposure beyond specified operating conditions may affect device reliability or cause malfunction. Operating Conditions Parameter Supply voltage Operating temperature Quartz serial resistance Symbol VDD TA RS Min 1.2 -10 Max 5.5 +85 110 Unit V °C kΩ Min Typ Max Unit 1.2 3.0 300 250 750 5.5 550 500 1000 V nA nA nA 650 900 nA 0.4 ± 0.2 0.8 ±2 kHz V sec ppm/V 70 70 50 VSS + 0.4 100 100 60 V V ns ns % 0.2 x VDD VDD V V Electrical Characteristics VDD = 3.0 V; VSS = 0 V; TA = 25 °C; RS = 60 kΩ; unless otherwise specified. Parameter Symbol Conditions Supply Supply voltage range Mean current consumption (Note 1) Oscillator Output frequency Starting voltage Start-up time Voltage coefficient Output driver CLKOUT Output voltage high Output voltage low Output rise time Output fall time Duty cycle Output Enable CLKEN Input voltage low Input voltage high VDD IDD VDD = 5.0V, CLKEN at VSS VDD = 3.0V, CLKEN at VSS VDD = 5.0V, CLKEN at VSS, TA = -10 to +85 °C VDD = 3.0V, CLKEN at VSS TA = -10 to +85 °C fO VST TST f/fO* VDD 32.768 1.5 V ≤ VDD ≤ 5.5 V VOH VOL tr tf IOH = -1.0 mA IOL = 1.0 mA CL = 15 pF, 10% to 90% VDD CL = 15 pF, 10% to 90% VDD Within 3 seconds 1.2 VDD - 0.4 40 VIL VIH VSS 0.8 x VDD Note 1: The current consumption when the output clock is enabled (CLKEN pin at VDD) is a function of the load capacitance on the CLKOUT pin, the output frequency fOUT = 32768Hz and the supply voltage VDD. The additional consumption for a given load can be calculated from: ΔIDD = CLOAD x VDD x fOUT. Copyright 2013, EM Microelectronic-Marin SA 7604-DS.doc, Version 2.0, 17-Dec-13 2 www.emmicroelectronic.com 420005-A01, 2.0 EM7604 Timing Waveforms 32768Hz CLKEN CLKOUT tCKH tCKL 32768Hz CLKEN CLKOUT tCKH tCKL = 0 VIH CLKEN VIL CLKOUT tCKL tCKH Application Note Using EM7604 with disturbed Supply Voltage on VDD If the power supply of the EM7604 (VDD) is disturbed, the circuit must be protected against VDD fast transients. As the oscillator has a very low power consumption, the clock generation is sensitive to fast supply changes and clock pulses could be lost. If in the application, positive or negative VDD fast slopes may occur, an RC low pass filter in the VDD supply connection of the EM7604 must be used, according to the following figure: Typical Application Schematic R + C VDD_EXT VDD XI VDD EM7604 Crystal µC XO (Application) CLKOUT CLKEN GPIO VSS VSS VSS = 0V The RC filter is composed of a capacitor (C) and resistor (R) implemented per example by a 1k resistor and a 10µF capacitor. The resistor and the capacitor can be adapted if needed. Copyright 2013, EM Microelectronic-Marin SA 7604-DS.doc, Version 2.0, 17-Dec-13 3 www.emmicroelectronic.com 420005-A01, 2.0 EM7604 Package Information: Ordering Information Part Number EM7604V00SP6B+ Version Package Type Top Side Marking V00 SOT23-6 OVXY Delivery Form Tape & Reel Contact EM Microelectronic for availability in chip form or in other packages. XY characters of the Top marking are used for the lot traceability. EM Microelectronic-Marin SA (“EM”) makes no warranties for the use of EM products, other than those expressly contained in EM's applicable General Terms of Sale, located at http://www.emmicroelectronic.com. EM assumes no responsibility for any errors which may have crept into this document, reserves the right to change devices or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. No licenses to patents or other intellectual property rights of EM are granted in connection with the sale of EM products, neither expressly nor implicitly. In respect of the intended use of EM products by customer, customer is solely responsible for observing existing patents and other intellectual property rights of third parties and for obtaining, as the case may be, the necessary licenses. Important note: The use of EM products as components in medical devices and/or medical applications, including but not limited to, safety and life supporting systems, where malfunction of such EM products might result in damage to and/or injury or death of persons is expressly prohibited, as EM products are neither destined nor qualified for use as components in such medical devices and/or medical applications. The prohibited use of EM products in such medical devices and/or medical applications is exclusively at the risk of the customer Copyright 2013, EM Microelectronic-Marin SA 7604-DS.doc, Version 2.0, 17-Dec-13 4 www.emmicroelectronic.com 420005-A01, 2.0