r EM7604 copyright ? 2006, em microelectronic-marin sa 03/06 ? rev.a 1 www.emmicroelectronic.com low power crystal oscillator 32.768 khz description the 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 ot her external components are required. in order to achieve a high frequency accuracy, the matched crystals should have a 20ppm tolerance or tighter. very low power consumption, as low as 250na, is guaranteed over a very wide supply voltage and temperature ranges. offered in a small sot23-6 package, the EM7604 is a completely lead free product. applications ? general purpose clock generator for digital systems ? clock drivers for real time clocks ? timekeeping in network servers and computers ? electricity, gas and water metering ? portable field communication ? mobile phone ? solution for problems with embedded quartz oscillators pin assignment features ? very low power consumption: typ. 250na ? on chip integrated oscillation capacitor: c l =8pf ? matched low cost smd quartz available from micro crystal ? compatibility with crystals having high series resistance ? very tight frequency tolerance ? excellent oscillator stability: 0.2ppm/v ? wide supply voltage range: 1.2v to 5.5v ? operating temperature range: -40c to +125c ? small sot23-6 package ? 100% lead free, rohs ? compliant block diagram oscillator out oe vdd vss output control regulation 1 vss EM7604 2 3 oscout oscin 6 5 4 oe vdd out sot23 pin connection assignment 1 oscout oscillator output 2 vss negative supply voltage 3 oscin oscillator input 4 oe output enable 5 vdd positive supply voltage 6 out frequency output em microelectronic - marin sa
r EM7604 copyright ? 2006, em microelectronic-marin sa 03/06 ? rev.a 2 www.emmicroelectronic.com absolute maximum ratings parameter symbol conditions voltage at v dd to v ss v dd -0.3v to +6v minimun voltage v min v ss ? 0.3v maximun voltage v max v dd + 0.3v storage temperature range t stg -55c to +150c maximum soldering t smax 260c 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. 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 o peration 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. operating conditions parameter symbol min max unit supply voltage v dd 1.2 5.5 v operating temperature t a -40 +125 c electrical characteristics unless otherwise specified: v dd = 3.0v, v ss = 0v, t a =25c and r s = 60k ? parameter symbol conditions min typ max unit supply voltage range v dd 1.2 3.0 5.5 v current consumption i dd1 v dd = 5.0v, oe at v ss 300 550 na ( note1) v dd = 3.0v, oe at v ss 250 500 na v dd = 2.0v, oe at v ss 250 500 na v dd = 5.0v, oe at v ss top=-40 to +85c 750 1000 na v dd = 3.0v, oe at v ss top=-40 to +85c 650 900 na v dd = 2.0v, oe at v ss top=-40 to +85c 650 900 na oscillator input capacitance c in 16 pf output capacitance c out 16 pf start up voltage v startup t start < 3s 1.2 start up time t startup 0.4 0.8 s frequency stability against supply voltage variations f/f * v 1.5 v dd 5.5v 0.2 2 ppm/v input input voltage v il v ss 0.2 x v dd v v ih 0.8 x v dd v dd v output duty cycle 40 50 60 % output voltage v oh i oh = -1.0 ma, v dd = 5.0v v dd -0.4 v dd -0.1 v v ol i ol = 1.0 ma, v dd = 5.0v 0.14 0.4 v output rise and fall time t rf c l = 15pf 10% - 90% 70 100 ns note1: the current consumption when the out put clock is enabled (oe pin at v dd ) is a function of the load capacitance on the out pin, the output frequency f out = 32768hz and the supply voltage v dd . the additional consumption for a given load can be calculated from: i dd = c load x v dd x f o
r EM7604 copyright ? 2006, em microelectronic-marin sa 03/06 ? rev.a 3 www.emmicroelectronic.com timing waveforms 32768hz oe out 32768hz oe out oe out v ih v il t ckh t ckl t ckh t ckh t ckl t ckl frequency temperature characteristics with standard 32.768 khz crystal
r EM7604 copyright ? 2006, em microelectronic-marin sa 03/06 ? rev.a 4 www.emmicroelectronic.com package information: ordering information part number package type top marking delivery form EM7604v1sp6b+ sot23 ovxy 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 warranty for the use of its products, other than thos e expressly contained in the company's standard warranty which is detailed in em's general terms of sale located on the company's web site. em assumes no responsibility for any errors which may appear in this docum ent, reserves the right to change devices or specifications detailed herein at any time wit hout notice, and does not make any commitment to update the information contained herein. no licenses to patents or other intellectual pro perty of em are granted in connection with the sale of em products, expressly or b y implications. em's products are not authorized for use as components in life support devices or systems.
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