datasheet low cost 54 mhz 3.3 volt vcxo mk3754 idt? / ics? low cost 54 mhz 3.3 volt vcxo 1 mk3754 rev h 072805 description the mk3754d and mk3754b are drop-in replacements for the mk3754s device. compared to these earlier devices the mk3754d and mk3754b offer a wider operating frequency range and improved power supply noise rejection. the mk3754 is ics? lowest cost, low jitter, high performance 3.3 volt vcxo and pll clock synthesizer designed to replace expensive 54 mhz vcxos. the on-chip voltage controlled crys tal oscillator accepts a 0 to 3.3 v input voltage to vary the output clocks by 100 ppm. using ics? patented vcxo and analog/digital phase-locked loop (pll) techniques, the device uses an inexpensive external 13.5 mhz pullable crystal input to produce a 54 mhz output clock. the mk3754d exhibits a moderate vcxo gain of 120 ppm/v typical, when used with a high quality external pullable quartz crystal. the mk3754b offers a higher vcxo gain of 150 ppm/v. the higher intrinsic vcxo gain of the mk3754b may help compensate for the reduced pullability of a low quality crysta l used in some applications. however, higher vcxo gain may also increase clock output phase noise. the frequency of the on-chip vcxo is adjusted by an external control voltage input into pin vin. because vin is a high impedance input, it can be driven directly from an pwm rc integrator circuit. frequency output increases with vin voltage input. the usab le range of vin is 0 to 3 v. features ? mk3754d and mk3754b are drop-in upgrades to the earlier mk3754s device ? packaged in 8-pin soic ? available in pb (lead) free package ? operating voltage of 3.3 v ? uses an inexpensive 13.500 mhz external crystal ? on-chip vcxo (patented) with pull range of 200 ppm (minimum) ? vcxo turning voltage of 0 to 3.3v ? 12 ma output drive ca pability at ttl levels ? advanced, low power, sub-micron cmos process mk3754d is recommended for new designs. block diagram 54 mhz x1 x2 voltage controlled crystal oscillator vin 13.5 mhz pullable crystal pll/clock synthesis circuitry vdd gnd
mk3754 low cost 54 mhz 3.3 volt vcxo vcxo and multiplier idt? / ics? low cost 54 mhz 3.3 volt vcxo 2 mk3754 rev h 072805 pin assignment pin descriptions x1 vdd vin gnd gnd clk vdd x2 1 2 3 4 8 7 6 5 mk3754s mk3754b mk3754d 8 pin (150 mil) soic pin number pin name pin type pin description 1 xi input crystal connection. connect to the external pullable crystal. 2 vdd power connect to +3.3 v (0.01uf decoupling capacitor recommended). 3 vin input voltage input to vcxo -- 0 to 3.3 v analog input which controls the oscillation frequency of the vcxo. 4 gnd power connect to ground. 5 vdd power connect to +3.3 v (0.01uf decoupling capacitor recommended). 6 clk output 54 mhz clock output. 7 gnd power connect to ground. 8 x2 input crystal connection. connect to the external pullable crystal.
mk3754 low cost 54 mhz 3.3 volt vcxo vcxo and multiplier idt? / ics? low cost 54 mhz 3.3 volt vcxo 3 mk3754 rev h 072805 external component selection the mk3754 requires a minimum number of external components for proper operation. decoupling capacitor a decoupling capacitor of 0.01 f must be connected between vdd (pin 2) and gnd (pin 4), as close to these pins as possible. for optimum device performance, the decoupling capacitor should be mounted on the component side of the pcb. avoid the use of vias in the decoupling circuit. series termination resistor when the pcb trace between the clock output (clk, pin 5) and the load is over 1 inch, series termination should be used. to series terminate a 50 ? trace (a commonly used trace impedance) place a 33 ? resistor in series with the clock line, as close to the clock output pin as possible. the nominal impedance of the clock output is 20 ? . quartz crystal the mk3754 vcxo function consists of the external crystal and the integrated vcxo oscilla tor circuit. to assure the best system performance (frequency pull range) and reliability, a crystal de vice with th e recommended parameters (shown below) must be used, and the layout guidelines discussed in the following section shown must be followed. the frequency of oscilla tion of a quartz crystal is determined by its ?cut? and by the load capacitors connected to it. the mk3754 incorporates on-chip variable load capacitors that ?pull? (change) the frequency of the crystal. the crystal specified for use with the mk3754 is designed to have zero frequency error when the total of on-chip + stray capacitance is 14 pf. recommended crystal parameters: initial accuracy at 25 c 20 ppm temperature stability 30 ppm aging 20 ppm load capacitance 14 pf shunt capacitance, c0 7 pf max c0/c1 ratio 250 max equivalent series resistance 35 ? max the external crystal must be connected as close to the chip as possible and should be on the same side of the pcb as the mk3754. there should be no via?s between the crystal pins and the x1 and x2 device pins. there should be no signal traces underneath or close to the crystal. crystal tuning load capacitors the crystal traces should include pads for small fixed capacitors, one between x1 and ground, and another between x2 and ground. stuffing of these capacitors on the pcb is optional. the need for these capacitors is determined at system prototype evaluation, and is influenced by the particular crystal used (manufacture and frequency) and by pcb layout. the typical required capacitor value is 1 to 4 pf. the procedure for determining the value of these capacitors can be found in application note man05.
mk3754 low cost 54 mhz 3.3 volt vcxo vcxo and multiplier idt? / ics? low cost 54 mhz 3.3 volt vcxo 4 mk3754 rev h 072805 absolute maximum ratings stresses above the ratings listed below can cause perm anent damage to the mk3754. these ratings, which are standard values for ics commercially rated parts, are stress ratings only. functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for exte nded periods can affect product reliability. electrical parameters are guaranteed only over the recommended operating temperature range. recommended operation conditions item rating supply voltage, vdd 7v all inputs and outputs -0.5v to vdd+0.5v ambient operating temperature 0 to +70 c storage temperature -65 to +150 c soldering temperature 260 c parameter min. typ. max. units ambient operating temperature 0 ? +70 c power supply voltage (measured in respect to gnd) +3.15 +3.45 v reference crystal parameters refer to page 3
mk3754 low cost 54 mhz 3.3 volt vcxo vcxo and multiplier idt? / ics? low cost 54 mhz 3.3 volt vcxo 5 mk3754 rev h 072805 dc electrical characteristics vdd=3.3 v 5% , ambient temperature 0 to +70 c, unless stated otherwise ac electrical characteristics vdd = 3.3 v 5% , ambient temperature 0 to +70 c, unless stated otherwise note 1: external crystal device must conform with pullable crystal specifications listed on page 3. parameter symbol conditions min. typ. max. units operating voltage vdd 3.15 3.45 v output high voltage v oh i oh = -12 ma 2.4 v output low voltage v ol i ol = 12 ma 0.4 v output high voltage (cmos level) v oh i oh = -4 ma vdd-0.4 v operating supply current idd no load 9 ma short circuit current i os 50 ma vin, vcxo control voltage v ia 03.3v parameter symbol conditions min. typ. max. units crystal pullability mk3754d and mk3754b f p 0v< vin < 3.3 v, note 1 + 115 ppm mk3754s f p 0v< vin < 3.3 v, note 1 + 100 ppm vcxo gain mk3754d vin = vdd/2 + 1 v, note 1 120 ppm/v mk3754b vin = vdd/2 + 1 v, note 1 150 ppm/v mk3754s vin = vdd/2 + 1 v, note 1 100 ppm/v output rise time t or 0.8 to 2.0 v, c l =15 pf 1.5 ns output fall time t of 2.0 to 0.8 v, c l =15 pf 1.5 ns output clock duty cycle t d measured at 1.4 v, c l =15 pf 45 50 55 % maximum output jitter, short term t j c l =15 pf 100 ps
mk3754 low cost 54 mhz 3.3 volt vcxo vcxo and multiplier idt? / ics? low cost 54 mhz 3.3 volt vcxo 6 mk3754 rev h 072805 package outline and package dimensions (8-pin soic, 150 mil. narrow body) package dimensions are kept current with jedec publication no. 95 ordering information parts that are ordered with a "lf" su ffix to the part number are the pb-fr ee configuration and are rohs compliant. note 1: mk3754d and mk3754dlf are recommended for ne w designs. call factory fo r information on mk3754s. while the information presented herein has been checked for both a ccuracy and reliability, integrat ed circuit systems (ics) ass umes no responsibility for either its use or for the infringement of an y patents or other rights of third parties, which would result f rom its use. no other circuits, patents, or licenses are im plied. this product is intended for use in normal commercial applications. any other applications such as those requiring extended temperature range, high reliab ility, or other extraordinary environmental requirements are not recommended without additional processing by ics. ics reserves th e right to change any circuitr y or specifications without noti ce. ics does not authorize or warrant any ics product for use in life support devices or critical medical instruments. part/order number (note 1) marking shipping packaging package temperature mk3754d mk3754d tubes 8-pin soic 0 to +70 c mk3754dtr mk3754d tape and reel 8-pin soic 0 to +70 c mk3754dlf 3754dlf tubes 8-pin soic 0 to +70 c mk3754dlftr 3754dlf tape and reel 8-pin soic 0 to +70 c mk3754b mk3754b tubes 8-pin soic 0 to +70 c mk3754btr mk3754b tape and reel 8-pin soic 0 to +70 c mk3754blf 3754blf tubes 8-pin soic 0 to +70 c MK3754BLFTR 3754blf tape and reel 8-pin soic 0 to +70 c mk3754s mk3754s tubes 8-pin soic 0 to +70 c mk3754str mk3754s tape and reel 8-pin soic 0 to +70 c mk3754slf 3754slf tubes 8-pin soic 0 to +70 c mk3754slftr 3754slf tape and reel 8-pin soic 0 to +70 c d eh c h x 45 0 b e q a pin 1 index area *for reference only. controlling dimensions in mm. millimeters inches* symbol min max min max a 1.35 1.75 0.0532 0.0688 a1 1.10 0.25 0.0040 0.0098 b 0.33 0.51 0.013 0.020 c 0.19 0.25 0.0075 0.0098 d 4.80 5.00 .1890 .1968 e 3.80 4.00 0.1497 0.1574 e 1.27 basic 0.050 basic h 5.80 6.20 0.2284 0.2440 h 0.25 0.50 0.010 0.020 l 0.40 1.27 0.016 0.050 a0 8 0 8
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