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  ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| pt0173(05/04) ver: 0 1 preliminary data sheet PT7V2727/3727 vcxo product features ? 3.3v/5.0v operating voltage ? uses an inexpensive external crystal ? on-chip vcxo with pull range of 240ppm ? vcxo tuning voltage from 0 to 3.3v ? 10ma output driver at cmos levels ? available in soic package ordering information ordering code package type operating range PT7V2727w 8-pin soic industrial pt7v3727w 8-pin soic industrial logic block diagram pin configuration pin description pin number 2727 3727 pin name type description 1, 8 1, 8 x1, x2 i crystal connection, connect to a pullable 27mhz crystal 2, 7 6 nc no connect, can be float or connected to v cc or gnd 3 3 v in i voltage input to vcxo 4 4, 7 gnd pwr ground 5 5 clkout o clock output 6 2 v cc pwr power supply + 3.3v/5.0v general description the PT7V2727/3727 are low-cost, high-performance 3.3v /5.0v vcxo, designed to replace expensive vcxo modules. the on-chip voltage causes clocks to vary by 120ppm. they use an inexpensive external pullable crystal at 27mhz to produce the same output frequency. applications z set-top box z xdsl 1 2 3 4 5 6 7 8 x1 vin gnd nc x2 nc vcc PT7V2727 soic 8 package clkout 1 2 3 4 5 6 7 8 x1 vin gnd vcc x2 gnd nc clkout pt7v3727 soic 8 package
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| pt0173(05/04) ver: 0 2 preliminary data sheet PT7V2727/3727 vcxo maximum ratings (above which the useful life may be impaired. for user guidelines, not tested.) dc electrical characteristics (unless otherwise specified, v cc = 3.3v, f o = 27mhz, v in = 1.65v, load = 15pf, t a = 25 o c) sym. parameter test condition pin min. typ. max. unit v cc supply voltage v cc 3.153 3.3 3.465 v i cc supply current oe = 3.3v, c l = 15pf v cc 5 ma i oh high-level output voltage v oh = v cc -0.5v clkout -11 -4 i ol low-level output voltage v ol = 0.5v clkout 4 12 ma r s * negative resistance v in = 0v x1, x2 -150 ? f input frequency x1, x2 20 27 30 mhz c l output capacitance clkout 15 30 pf * note: only reference for design. ac electrical characteristics (unless otherwise specified, f o = 27mhz, load = 15pf, t a = 25 o c) sym. parameter test condition pin min. typ. max. unit t r / t f rise / fall time 0.1v cc to 0.9v cc clkout 1.5 6 ns duty output clock duty cycle at v cc /2 clkout 45 50 55 % ? f output frequency pull range v in from 0v to v cc 120 ppm t j cycle to cycle jitter 50 ps linearity v in from 0.1 to 0.9v cc 10 % oscillator start time trigger at 0.9v cc 1.5 10 ms storage temperature??????..-55 o c to 125 o c ambient temperature?????.?.-40 o c to 85 o c supply voltage v cc ?????.? . ? -0.5v to 7v input voltage????????-0.5v to v cc +0.5v output current ????????????.10ma soldering lead temperature(10s)?????.260 o c note: stresses greater than those listed under maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability.
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| pt0173(05/04) ver: 0 3 preliminary data sheet PT7V2727/3727 vcxo recommended crystal specifications description crystal mode of oscillation fundamental frequency range 27.000mhz frequency tolerance 30ppm temperature plus aging stability 50ppm operating temperature -20oc to + 70oc c0/c1 240(max.) load capacitance(c l ) 18pf equivalent series resist ance(esr) 35ohms(max.)
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| pt0173(05/04) ver: 0 4 preliminary data sheet PT7V2727/3727 vcxo plastic 8-pin soic (w) package
||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| pt0173(05/04) ver: 0 5 preliminary data sheet PT7V2727/3727 vcxo notes pericom technology inc. email: support@pti.com.cn web site: www.pti.com.cn, www.pti-ic.com china : no. 20 building, 3/f, 481 guiping road, shanghai, 200233, china tel: (86)-21-6485 0576 fax: (86)-21-6485 2181 asia pacific : unit 1517, 15/f, chevalier commercial centre, 8 wang hoi rd, kowloon bay, hongkong tel: (852)-2243 3660 fax: (852)- 2243 3667 u.s.a. : 3545 north first street, san jose, california 95134, usa tel: (1)-408-435 0800 fax: (1)-408-435 1100 pericom technology incorporation reserves the right to make changes to its products or specifications at any time, without noti ce, in order to improve design or performance and to supply the best possible product. pericom technology does not assume any responsibility for use of any circu itry described other than the circuitry embodied in pericom technology product. the company makes no representations that circuitry described herein is free from patent infringement or other rights, of pericom technology incorporation.


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