1 ps9738 05/27/04 pi6c48535-11 block diagram features ? maximum operation frequency: 500mhz ? 4 pair of differential lvpecl outputs ? selectable clk and crystal inputs ? clk accepts lvcmos, lvttl input level ? output skew: 30ps (maximum) ? part-to-part skew: 150ps (maximum) ? propagation delay: 1.5ns (maximum) ? 3.3v power supply ? pin-to-pin compatible to ics8535-11 ? operating temperature: -40 o c to 85 o c ? packaging (pb-free & green available ) : - 20-pin tssop (l) 3.3v low skew 1-to-4 crystal/lvcmos to lvpecl fanout buffer description the pi6c48535-11 is a high-performance low-skew lvpecl fanout buffer. pi6c48535-11 features selectable of single-ended clock or crystal inputs and translates to four lvpecl outputs. the clk input accepts lvcmos or lvttl signals. the outputs are synchronized with input clock during asynchronous assertion /deassertion of clk_en pin. pi6c48535-11 is ideal for crystal or lvcmos/lvttl to lvpecl translation. typical clock transla - tion and distribution applications are data-communications and telecommunications. pin diagram q 0 n q 0 v c c q 1 n q 1 q 2 n q 2 v c c q 3 n q 3 v ee clk_en clk_sel clk nc xtal 1 xtal 2 nc nc v cc 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 clk_en clk xtal1 xtal2 clk_sel q 0 n q 0 q 1 n q 1 q 2 n q 2 q 3 n q 3 0 1 d le q
pi6c48535-11 3.3v low skew 1-to-4 crystal/lvcmos to lvpecl fanout buffer 2 ps9738 05/27/04 pin description name pin # type description v ee 1 p connect to negative power supply clk_en 2 i_pu synchronizing clock enable. when high, clock outputs follow clock input. when low, q x outputs are forced low, n q x outputs are forced high. lvcmos/lvttl level with 50k? pull up. clk_sel 3 i_pd clock select input. when high, selects clk 1 input. when low, selects clk 0 input. lvcmos/lvttl level with 50k? pull down. clk 4 i_pd lvcmos / lvttl clock input xtal1, xtal2 6, 7 crystal input and output nc 5, 8, 9 no internal connection. v cc 10, 13, 18 p connect to 3.3v q 3 , n q 3 11, 12 o differential output pair, lvpecl interface level. q 2 , nq2 14, 15 o differential output pair, lvpecl interface level. q 1 , n q 1 16, 17 o differential output pair, lvpecl interface level. q 0 , n q 0 19, 20 o differential output pair, lvpecl interface level. notes: 1. i = input, o = output, p = power supply connection, i_pd = input with pull down, i_pu = input with pull up pin characteristics symbol parameter conditions min. typ. max. units c in input capacitance 4 pf r_pullup input pullup resistance 50 k? r_pulldown input pulldown resistance 50 k? control input function table inputs outputs clk_en clk_sel selected source q 0 :q 3 n q 0 : n q 3 0 0 clk diasbled: low diasbled: high 0 1 xtal1, xtal2 disabled: low disabled: high 1 0 clk enabled enabled 1 1 xtal1, xtal2 enabled enabled notes: 1. after clk_en switches, the clock outputs are disabled or enabled following a rising and falling input clock edge as show below .
pi6c48535-11 3.3v low skew 1-to-4 crystal/lvcmos to lvpecl fanout buffer 3 ps9738 05/27/04 figure 1. clk_en timing diagram clock input function table inputs outputs clk q 0 :q 3 n q 0 : n q 3 0 low high 1 high low disabled enable d disabled enable d clk clk_en nq0:nq3 q0:q3 absolute maximum ratings symbol parameter conditions min. typ. max. units v cc supply voltage referenced to gnd 4.6 v v in input voltage referenced to gnd -0.5 v cc +0.5v v out output voltage referenced to gnd -0.5 v cc +0.5v t stg storage temperature -65 150 o c notes: 1. stresses above those listed under absolute maximum ratings may cause permanent damage to the device. these ratings are stress speci- fcations only and correct functional operation of the device at these or any other conditions above those listed in the operational sections of the specifcations is not implied. exposure to absolute maximum rating conditions for extended periods may affect product reliability. operating conditions symbol parameter conditions min. typ. max. units v cc power supply voltage 3.0 3.3 3.6 v t a ambient temperature -40 85 o c i ee power supply current 60 ma
pi6c48535-11 3.3v low skew 1-to-4 crystal/lvcmos to lvpecl fanout buffer 4 ps9738 05/27/04 lvcmos/lvttl dc characteristics ( t a = -40 o c to 85 o c, v cc = 3.0v to 3.6v unless otherwise stated below.) symbol parameter conditions min typ max units v ih input high voltage 2 v cc +0.3 v v il input low voltage -0.3 0.8 i ih input high current clk, clk_sel v in = v cc = 3.6v 150 a clk_en v in = v cc = 3.6v 5 i il input low current clk, clk_sel v in = 0v, v cc = 3.6v -5 clk_en v in = 0v, v cc = 3.6v -150 lvpecl dc characteristics (t a = -40 o c to 85 o c, v cc = 3.0v to 3.6v unless otherwise stated below.) symbol parameter conditions min. typ. max. units v oh output high voltage (1) v cc -1.4 v cc -0.9 v v ol output low voltage (1) v cc -2.0 v cc -1.7 v swing peak-to-peak output voltage swing 0.6 1.0 notes: 1. outputs terminated with 50 to v cc -2.0v crystal characteristics parameter min. typ. max. units mode of oscillation fundamental frequency range 14 25 mhz equivalent series resistance (esr) 70 shunt capacitance 7 pf ac characteristics (t a = -40 o c to 85 o c, v cc = 3.0v to 3.6v) symbol parameter conditions min. typ. max. units f max output frequency 500 mhz t pd propagation delay (1) 1.0 1.5 ns tsk(o) output-to-output skew (2) 30 ps tsk(pp) part-to-part skew (3) 150 t r /t f output rise/fall time 20% - 80% 100 400 odc output duty cycle 48 52 % osc crystal tolerance 1000 ppm notes: 1. measured from the v cc /2 of the input to the differential output crossing point 2. defned as skew between outputs at the same supply voltage and with equal load condition. measured at the outputs differential crossing point. 3. defned as skew between outputs on different parts operating at the same supply voltage and with equal load condition. measured at the out - puts differential crossing point. 4. all parameters are measured at 500mhz unless noted otherwise
pi6c48535-11 3.3v low skew 1-to-4 crystal/lvcmos to lvpecl fanout buffer 5 ps9738 05/27/04 pericom semiconductor corporation ? 1-800-435-2336 ? www.pericom.com packaging mechanical: 20-pin tssop (l) ordering information ordering code package code package description PI6C48535-11LE l pb-free & green 20-pin 173-mil wide tssop notes: 1. thermal characteristics can be found on the company web site at www .pericom.com/packaging/ 2. number of transistors = tbd .252 .260 .047 1.20 .002 .006 seating plane .0256 bsc .018 .030 .004 .008 .238 .269 1 20 .169 .177 x.xx x.xx denotes controlling dimensions in millimeters 0.05 0.15 6.1 6.7 0.45 0.75 0.09 0.20 4.3 4.5 6.4 6.6 0.65 0.19 0.30 .007 .012 max
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