1 pi6c48535-01b rev a 09/25/2012 pi6c48535-01b block diagram features ? maximum operation frequency: 500 mhz ? 4 pair of differential lvpecl outputs ? selectable clk 0 and clk 1 inputs ? clk 0 , clk 1 accept lvcmos, lvttl input level ? output skew: 40ps (typical) ? propagation delay: 1.5ns (typical) ? 3.3v power supply ? additive jitter of 0.03ps (typical) ? operating t emperature: -40 o c to 85 o c ? packaging (pb-free & green available): 20-pin tssop (l) 3.3v low skew 1-to-4 lvttl/lvcmos to lvpecl fanout buffer description the pi6c48535-01b is a high-performance low-skew l vpecl fanout b uffer. p i6c48535-01b f eatures t wo s electable s ingle-ended clock inputs and translates to four l vpecl outputs. the clk 0 and clk 1 inputs accept l vcmos or l vttl signals. the outputs are synchronized with input cloc k during asynchronous assertion/ deassertion of clk_en pin. pi6c48535-01b is ideal for single- ended l vttl/lvcmos to l vpecl translations. t ypical clock translation and distribution appli cations are data-communications and telecommunications. pin confguration clk_en clk 0 clk 1 clk_sel q 3 n q 3 q 1 n q 1 q 2 n q 2 q 0 n q 0 0 1 d le q v ee clk_en clk_sel clk 0 nc clk 1 nc nc nc v cc q 0 nq 0 v cc q 1 nq 1 q 2 nq 2 v cc q 3 nq 3 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 12-0258
pi6c48535-01b 3.3v low skew 1-to-4 lvttl/lvcmos to lvpecl fanout buffer 2 pi6c48535-01b rev a 09/25/2012 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, qx outputs are forced low, nqx 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 0 4 i_pd lvcmos / lvttl clock input clk 1 6 i_pd lvcmos / lvttl clock input nc 5, 7, 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 , n q 2 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 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 0 diasbled: low diasbled: high 0 1 clk 1 disabled: low disabled: high 1 0 clk 0 enabled enabled 1 1 clk 1 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. 12-0258
pi6c48535-01b 3.3v low skew 1-to-4 lvttl/lvcmos to lvpecl fanout buffer 3 pi6c48535-01b rev a 09/25/2012 figure 1. clk_en timing diagram clock input function table inputs outputs clk 0 or clk 1 q 0 :q 3 n q 0 : n q 3 0 low high 1 high low disabled enabled clk 0 clk 1 clk_en nq0:nq3 q0:q3 disabled enabled 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 v oltage 3.0 3.3 3.6 v t a ambient t emperature -40 85 o c i dd power supply current all outputs unloaded 130 ma 12-0258
pi6c48535-01b 3.3v low skew 1-to-4 lvttl/lvcmos to lvpecl fanout buffer 4 pi6c48535-01b rev a 09/25/2012 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 1.5 ns t sk(o) output-to-output skew 40 ps t r /t f output rise/fall time 20% - 80% 150 odc output duty cycle 48 52 % j add additive jitter 30 fs notes: 1. all parameters are measured with cmos input of 266mhz unless stated otherwise lvpecl dc characteristics symbol parameter conditions min. typ. max. units v oh output high v oltage v cc = 3.3v 2.1 2.6 v v ol output low v oltage v cc = 3.3v 1.3 1.8 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 clk 0 , clk 1 , clk_en, clk_sel 2 v cc +0.3 v v il input low voltage clk 0 , clk 1 -0.3 0.8 v clk_en, clk_sel -0.3 0.8 v i ih input high current clk0, clk1, clk_sel v in = v cc = 3.6v 150 ua clk_en v in = v cc = 3.6v 15 ua i il input low current clk 0 , clk 1 , clk_sel v in = 0v, v cc = 3.6v -10 ua clk_en v in = 0v, v cc = 3.6v -150 ua 12-0258
pi6c48535-01b 3.3v low skew 1-to-4 lvttl/lvcmos to lvpecl fanout buffer 5 pi6c48535-01b rev a 09/25/2012 confguration test load board termination for lvpecl v 100 150 z = 50 l = 0 ~ 10in 150 device o z = 50 o cc tla tla 12-0258
pi6c48535-01b 3.3v low skew 1-to-4 lvttl/lvcmos to lvpecl fanout buffer 6 pi6c48535-01b rev a 09/25/2012 pericom semiconductor corporation ? 1-800-435-2336 ? www .pericom.com packaging mechanical: 20-pin tssop (l) ordering information ordering code package code package description PI6C48535-01BLIE l pb-free & green 20-pin 173-mil wide tssop notes: ? thermal characteristics can be found on the company web site at www.pericom.com/packaging/ ? e = pb-free & green ? x sufx = tape/reel .252 .260 .047 1.20 .002 .006 seating plane .0256 bsc .018 .030 .004 .008 .238 .269 1 20 .169 .177 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 12-0258
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