cy29942 1:18 clock distribution buffer cypress semiconductor corporation ? 198 champion court ? san jose , ca 95134-1709 ? 408-943-2600 document number: 38-07284 rev. *h revised october 7, 2013 1:18 clock distribution buffer features operational range: up to 200 mhz lvcmos/lvttl clock input lvcmos-/lvttl-compatible logic input 18 clock outputs: drive up to 36 clock lines output-to-output skew: 110 ps (typical) output enable control supply voltage: 2.5 v or 3.3 v temperature range: comm ercial and industrial 32-pin tqfp package pin compatible with mpc942c functional description the cy29942 is a low voltage clock distribution buffer with an lvcmos or lvttl compatible clock input. the output enable control input is lvcmos/lvttl compatible. the eighteen outputs are 2.5 v or 3.3 v lvcmos or lvttl compatible, operate up to 200 mhz, and can drive 50 ?? series or parallel terminated transmission lines. for series terminated transmission lines, each output can drive one or two traces, giving the devices an effective fanout of 1:36. low output-to-output skews make the cy29942 an ideal clock distribution buffer for nested clock trees in the most demanding of synchronous systems. tclk oe vdd 18 q0-q17 logic block diagram
cy29942 document number: 38-07284 rev. *h page 2 of 10 pin configuration figure 1. 32-pin tqfp pinout cy29942 q0 q1 q2 vdd q3 q4 q5 vss q17 q16 q15 vss q14 q13 q12 vdd q6 q7 q8 vdd q9 q10 q11 vss vss vss tclk nc oe nc vdd vdd 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 9 10 11 12 13 14 15 16 32 31 30 29 28 27 26 25 pin descriptions pin name i/o description 3 tclk input external reference/test clock i nput. weak internal pull-down resistor. 5 oe input output enable. when high, all outputs are enabled. when set low, the outputs are at high impedance. weak internal pull-up resistor. 9, 10, 11, 13, 14, 15, 18, 19, 20, 22, 23, 24, 26, 27, 28, 30, 31, 32 q(17:0) output clock outputs 7, 8, 16, 21, 29 vdd 2.5 v or 3.3 v power supply 1, 2, 12, 17, 25 vss ground 4, 6 nc no connection
cy29942 document number: 38-07284 rev. *h page 3 of 10 absolute maximum ratings exceeding the maximum ratings may impair the useful life of the device. user guidelines are not tested. [1] maximum input volta ge relative to v ss : ............. v ss ? 0.3 v maximum input volta ge relative to v dd : ............. v dd + 0.3 v storage temperature: ................................. ?65 c to 150 c operating temperature: ............................... ?40 c to 85 c maximum esd protection .............................................. 2 kv maximum power supply: ............ ........... ........... ............ . 5.5 v maximum input current: ............................................ 20 ma this device contains circuitry to protect the inputs against damage due to high static voltages or electric field; however, precautions should be taken to av oid application of any voltage higher than the maximum rated volt ages to this circuit. for proper operation, i/o voltages should be constrained to the range: v ss < v i/o < v dd unused inputs must always be tied to an appropriate logic voltage level (either v ss or v dd ). dc electrical specifications v dd = 3.3 v 5% or 2.5 v 5% over the specified temperature range. parameter description conditions min typ max unit v il input low voltage v ss ?0.8v v ih input high voltage 2.0 ? v dd v i il input low current [2] ? ? ?200 a i ih input high current [2] ??200a v ol output low voltage [3] i ol = 20 ma ? ? 0.5 v v oh output high voltage [3] i oh = ?20 ma, v dd = 3.3 v 2.4 ? ? v i oh = ?16 ma, v dd = 2.5 v 2.0 ? ? v i ddq quiescent supply current oe = v ss ?57ma i dd dynamic supply current v dd = 3.3 v, outputs at 150 mhz, cl = 15 pf ? 285 ? ma v dd = 3.3 v, outputs at 200 mhz, cl = 15 pf ? 335 ? ma v dd = 2.5 v, outputs at 150 mhz, cl = 15 pf ? 200 ? ma v dd = 2.5 v, outputs at 200 mhz, cl = 15 pf ? 240 ? ma z out output impedance v dd = 3.3 v 8 12 16 ? v dd = 2.5 v 10 15 20 ? c in input capacitance ? 4 ? pf notes 1. the voltage on any input or i/o pin cannot exceed the power pin during power-up. 2. inputs have pull-up/pull-down resistors that effect input current. 3. driving series or parallel terminated 50 ? (or 50 ? to v dd /2) transmission lines.
cy29942 document number: 38-07284 rev. *h page 4 of 10 ac electrical specifications v dd = 3.3 v 5% or 2.5 v 5% over the specified temperature range [4] parameter description conditions min typ max unit fmax input frequency ? ? 200 mhz tpd ttl_clk to q delay [5, 6] v dd = 3.3 v 1.8 3.3 3.8 ns v dd = 2.5 v 2.3 3.8 4.4 ns dc output duty cycle [5, 6, 7] measured at v dd /2 45 ? 55 % tsk(0) output-to-output skew [5, 6] ? 110 200 ps tskew(pp) part-to-part skew [8] v dd = 3.3 v ? ? 1.0 ns v dd = 2.5 v ? ? 1.3 ns tskew(pp) part-to-part skew [9] ? ? 600 ps tr/tf output clocks rise/fall time [5, 6] 0.8 v to 2.0 v, v dd = 3.3 v; 0.5 v to 1.8 v, v dd = 2.5 v 0.2 ? 1.1 ns notes 4. parameters are guaranteed by design and characterization. not 100% tested in production. all parameters specified with loaded outputs. 5. outputs driving 50 ? transmission lines. 6. see figure 2 . 7. 50% input duty cycle. 8. across temperature and voltage ranges, includes output skew. 9. for a specific temperature and voltage, includes output skew.
cy29942 document number: 38-07284 rev. *h page 5 of 10 figure 2. lvcmos_clk cy29942 test reference for v cc = 3.3 v and v cc = 2.5 v figure 3. lvcmos propagation delay (tpd) test reference figure 4. output duty cycle (dc) figure 5. output-to-output skew tsk(0) pulse generator z = 50 ohm zo = 50 ohm vtt zo = 50 ohm vtt r t = 50 ohm r t = 50 ohm cy29942 dut t pd lvcmos_clk q vcc gnd vcc /2 vcc gnd vcc /2 vcc gnd vcc /2 t p t0 dc = tp / t0 x 100% t sk(0) vcc gnd vcc /2 vcc gnd vcc /2
cy29942 document number: 38-07284 rev. *h page 6 of 10 ordering code definitions ordering information part number package type production flow cy29942ai 32-pin tqfp industrial,?40 c to 85 c cy29942ait 32-pin tqfp ? tape and reel industrial, ?40 c to 85 c pb-free cy29942axi 32-pin tqfp industrial, ?40 c to 85 c cy29942axit 32-pin tqfp ? tape and reel industrial, ?40 c to 85 c CY29942AXC 32-pin tqfp commercial, 0 c to 70 c CY29942AXCt 32-pin tqfp ? tape and reel commercial, 0 c to 70 c x = blank or t blank = tube; t = tape and reel temperature range: x = c or i c = commercial; i = industrial x = pb-free indicator package type: a = 32-pin tqfp package 29942 = base part number company code: cy = cypress 29942 cy a x x t
cy29942 document number: 38-07284 rev. *h page 7 of 10 package drawing and dimensions figure 6. 32-pin tqfp (7 7 1.4 mm) a3214 package outline, 51-85088 51-85088 *e
cy29942 document number: 38-07284 rev. *h page 8 of 10 acronyms document conventions units of measure acronym description lvcmos low voltage complementary metal oxide semiconductor lvttl low voltage transistor-transistor logic oe output enable pll phase-locked loop tqfp thin quad flat pack symbol unit of measure c degree celsius kv kilovolt mhz megahertz a microampere ma milliampere ms millisecond mw milliwatt ns nanosecond ? ohm % percent pf picofarad ps picosecond vvolt
cy29942 document number: 38-07284 rev. *h page 9 of 10 document history page document title: cy29942, 1:18 clock distribution buffer document number: 38-07284 revision ecn orig. of change submission date description of change ** 111095 brk 02/07/02 new data sheet. *a 116777 hwt 08/14/02 added a commercial temp. range in the ordering information *b 122876 rbi 12/21/02 add power up requirements to maximum rating information. *c 334117 rgl see ecn added lead-free devices added typical value for output-output skew *d 2761988 kvm 09/10/09 ordering inform ation table: fixed typo and removed obsolete cy29942act. changed lead-free to pb-free. *e 2899304 bash/cxq 03/25/2010 removed cy29942ac part from ordering information. updated package diagram. *f 3034172 cxq 09/21/2010 changed spec title. updated format of ?features?, changed wording in ?functional description?. removed note 1, added info into table 1 directly. removed reference to multiple supplies, power supply sequencing from absolute maximum ratings. removed reference to v ddc from ac/dc electrical specs tables. added condition oe = v ss for i ddq in dc electrical specs table. fixed formatting in ac/dc electrical specs tables. changed t skew to t sk(o) to match figure 6. added ordering code definitions . added acronyms and units of measure sections. minor edits. *g 3548252 puru 03/12/2012 changed lqfp to tqfp throughout document. *h 4149208 cinm 10/07/2013 updated package drawing and dimensions : spec 51-85088 ? changed revision from *d to *e. updated in new template. completing sunset review.
document number: 38-07284 rev. *h revised october 7, 2013 page 10 of 10 all products and company names mentioned in this document may be the trademarks of their respective holders. cy29942 ? cypress semiconductor corporation, 2002-2013. the information contained herein is subject to change without notice. cypress s emiconductor corporation assumes no responsibility for the use of any circuitry other than circuitry embodied in a cypress product. nor does it convey or imply any license under patent or other rights. cypress products are not warranted nor intended to be used for medical, life support, life saving, critical control or safety applications, unless pursuant to an express written agreement wi th cypress. furthermore, cypress does not authorize its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. the inclusion of cypress products in life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies cypress against all charges. any source code (software and/or firmware) is owned by cypress semiconductor corporation (cypress) and is protected by and subj ect to worldwide patent protection (united states and foreign), united states copyright laws and internatio nal treaty provisions. cypress hereby grants to licensee a personal, non-exclusive, non-transferable license to copy, use, modify, create derivative works of, and compile the cypress source code and derivative works for the sole purpose of creating custom software and or firmware in su pport of licensee product to be used only in conjunction with a cypress integrated circuit as specified in the applicable agreement. any reproduction, modification, translation, compilation, or repre sentation of this source code except as specified above is prohibited without the express written permission of cypress. disclaimer: cypress makes no warranty of any kind, express or implied, with regard to this material, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. cypress reserves the right to make changes without further notice to t he materials described herein. cypress does not assume any liability arising out of the application or use of any product or circuit described herein. cypress does not authori ze its products for use as critical components in life-support systems where a malfunction or failure may reasonably be expected to result in significant injury to the user. the inclusion of cypress? prod uct in a life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies cypress against all charges. use may be limited by and subject to the applicable cypress software license agreement. sales, solutions, and legal information worldwide sales and design support cypress maintains a worldwide network of offices, solution center s, manufacturer?s representatives, and distributors. to find t he office closest to you, visit us at cypress locations . products automotive cypress.co m/go/automotive clocks & buffers cypress.com/go/clocks interface cypress. com/go/interface lighting & power control cypress.com/go/powerpsoc cypress.com/go/plc memory cypress.com/go/memory psoc cypress.com/go/psoc touch sensing cyp ress.com/go/touch usb controllers cypress.com/go/usb wireless/rf cypress.com/go/wireless psoc ? solutions psoc.cypress.com/solutions psoc 1 | psoc 3 | psoc 4 | psoc 5lp cypress developer community community | forums | blogs | video | training technical support cypress.com/go/support
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