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datasheet 3.3 volt zero delay clock multiplier idt2308b idt? 3.3 volt zero delay clock multiplier 1 idt2308b rev b 030509 description the idt2308b is a high-speed phase-lock loop (pll) clock multiplier. it is designed to address high-speed clock distribution and multiplication applications. the zero delay is achieved by aligning the phase between the incoming clock and the output clock, operable within the range of 10 to 133 mhz. the idt2308b has two banks of four outputs each that are controlled via two select addresses. by proper selection of input addresses, both banks can be put in tri-state mode. in test mode, the pll is turned off, and the input clock directly drives the outputs for system testing purposes. in the absence of an input clock, the idt2308b enters power down, and the outputs are tri-stated. in this mode, the device will draw less than 25a. the idt2308b is available in six unique configurations for both prescaling and multiplicat ion of the input ref clock. (see available options table.) the pll is closed externally to provide more flexibility by allowing the user to control the delay between the input clock and the outputs. features ? phase-lock loop clock distribution for applications ranging from 10 mhz to 133 mhz operating frequency ? distributes one clock input to two banks of four outputs ? separate output enable for each output bank ? external feedback (fbk) pin is used to synchronize the outputs to the clock input ? output skew <200 ps ? low jitter <200 ps cycle-to-cycle ? 1x, 2x, 4x output options (see available options table) ? no external rc network required ? operates at 3.3 v v dd ? available in 16-pin soic and tssop packages ? available in commercial and industrial temperature ranges block diagram
idt2308b 3.3 volt zero delay clock multiplier clock multiplier idt? 3.3 volt zero delay clock multiplier 2 idt2308b rev b 030509 pin assignment applications ? sdram ? te l e c o m ? datacom ? pc motherboards/workstations ? critical path delay designs function table 1 select input decoding note 1 : h = high voltage level; l = low voltage level pin descriptions notes : 1. weak pull-down. 2. weak pull-down on all outputs. 3. weak pull-up on these inputs. s2 s1 clka clkb output source pll shut down l l tri-state tri-state pll y l h driven tri-state pll n h l driven driven ref y h h driven driven pll n pin number pin name pin description 1ref 1 input reference clock, 5 volt tolerant input 2 clka1 2 clock output for bank a 3 clka2 2 clock output for bank a 4 vdd 3.3 v supply 5 gnd ground 6 clkb1 2 clock output for bank b 7 clkb2 2 clock output for bank b 8s2 3 select input, bit 2 9s1 3 select input, bit 1 10 clkb3 2 clock output for bank b 11 clkb4 2 clock output for bank b 12 gnd ground 13 vdd 3.3 v supply 14 clka3 2 clock output for bank a 15 clka4 2 clock output for bank a 16 fbk pll feedback input
idt2308b 3.3 volt zero delay clock multiplier clock multiplier idt? 3.3 volt zero delay clock multiplier 3 idt2308b rev b 030509 available options for idt2308b note 1: output phase is indeterminant (0 or 180 from input clock). absolute maximum ratings 1 notes: 1. stresses above the ratings listed below can cause permanent damage to the idt2308b. these ratings, which are standard values for idt 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 extended periods can affect produc t reliability. electrical parameters are guaranteed only over the recommended operating temperature range. 2. the input and output negative- voltage ratings may be exceeded if the input and output clamp-current ratings are observed. 3. the maximum package power dissipation is calculated using a j unction temperature of 150c and a board trace length of 750 mils. device feedback from bank a frequency bank b frequency idt2308b-1 bank a or bank b reference reference idt2308b-1h bank a or bank b reference reference idt2308b-2 bank a reference reference/2 idt2308b-2 bank b 2 x reference reference idt2308b-2h bank a reference reference/2 idt2308b-2h bank b 2 x reference reference idt2308b-3 bank a 2 x reference reference or reference 1 idt2308b-3 bank b 4 x reference 2 x reference idt2308b-4 bank a or bank b 2 x reference 2 x reference idt2308b-5h bank a or bank b reference/2 reference/2 symbol rating max. unit v dd supply voltage range -0.5 v to +4.6 v v i 2 input voltage range (ref) -0.5 v to +5.5 v v i input voltage range (except ref) -0.5 to v dd + 0.5 v i ik (v i < 0) input clamp current -50 ma i ok (v o < 0 or v o > vdd) terminal voltage with respect to gnd (inputs v ih 2.5, v il 2.5) 50 ma i o (v o = 0 to vdd) continuous output current 50 ma v dd or gnd continuous current 100 ma t a = 55 c (in still air only) 3 maximum power dissipation 0.7 w t stg storage temperature range -65 to +150 c operating temperature commercial range 0 to +70 c operating temperature industrial range -40 to +85 c
idt2308b 3.3 volt zero delay clock multiplier clock multiplier idt? 3.3 volt zero delay clock multiplier 4 idt2308b rev b 030509 zero delay and skew control to close the feedback loop of the idt2308b, the fbk pin can be driven from any of the eight available output pins. the output driving the fbk pin will be drivin g a total load of 7 pf pl us any additional load that it drives. the relative loading of this output (with respect to the remaining outputs) can adjust the input-output delay. for applications requiring zero input-output delay, all outputs including the one providing feedback should be equally loaded. if input-output delay adjustments are requi red, use the output load difference chart to calculate loading differences between the feedback output and remaining outputs. ensure the outputs are loaded equally, for zero output-output skew.
idt2308b 3.3 volt zero delay clock multiplier clock multiplier idt? 3.3 volt zero delay clock multiplier 5 idt2308b rev b 030509 operating conditions?commercial note 1 : applies to both ref and fbk. dc electrical characteristics?commercial symbol parameter conditions min. max. units v dd supply voltage 3 3.6 v t a operating temperature (ambient temperature) 0 70 c c l load capacitance below 100 mhz ? 30 pf load capacitance from 100 mhz to 133 mhz ? 15 pf c in input capacitance 1 ?7pf parameter symbol conditions min. typ. max. units input high voltage level v ih 2v input low voltage level v il 0.8 v input low current i il v in = 0v 50 a input high current i ih v in = v dd 100 a output high voltage v oh i oh = -8 ma (-1, -2, -3, -4) i oh = -12 ma (-1h, -2h, -5h) 2.4 v output low voltage v ol i ol = 8 ma (-1, -2, -3, -4) i ol = 12 ma (-1h, -2h, -5h) 0.4 v power down current i dd_pd ref = 0mhz (s2 = s1 = h) 12 a supply current i dd unloaded outputs select inputs at v dd or gnd 100 mhz clka (-1, -2, -3, -4) 45 ma 100 mhz clka (-1h, -2h, -5h) 70 66 mhz clka (-1, -2, -3, -4) 32 66 mhz clka (-1h, -2h, -5h) 50 33 mhz clka (-1, -2, -3, -4) 18 33 mhz clka (-1h, -2h, -5h) 30
idt2308b 3.3 volt zero delay clock multiplier clock multiplier idt? 3.3 volt zero delay clock multiplier 6 idt2308b rev b 030509 switching character istics?commercial note 1 : idt2308b-5h has maximum input frequency of 133.33 mhz and maximum output of 66.67 mhz. parameter symbol conditions min. typ. max. units output frequency t 1 30 pf load, all devices 10 100 mhz output frequency t 1 20 pf load, -1h, -2h, -5h devices 1 10 133.3 mhz output frequency t 1 15pf load, -1, -2, -3, -4 devices 10 133.3 mhz duty cycle = t2 t1 (-1, -2, -3, -4, -1h, -2h, -5h) measured at 1.4v, fout = 66.66mhz, 30pf load 40 50 60 % duty cycle = t2 t1 (-1, -2, -3, -4, -1h, -2h, -5h) measured at 1.4v, fout = 50mhz, 15pf load 45 50 55 % rise time (-1, -2, -3, -4) t 3 measured between 0.8v and 2v, 30pf load 2.2 ns rise time (-1, -2, -3, -4) t 3 measured between 0.8v and 2v, 15pf load 1.5 ns rise time (-1h, -2h, -5h) t 3 measured between 0.8v and 2v, 30pf load 1.5 ns fall time (-1, -2, -3, -4) t 4 measured between 0.8v and 2v, 30pf load 2.2 ns fall time (-1, -2, -3, -4) t 4 measured between 0.8v and 2v, 15pf load 1.5 ns fall time (-1h, -5h) t 4 measured between 0.8v and 2v, 30pf load 1.25 ns output to output skew on same bank (-1, -2, -3, -4) t 5 all outputs equally loaded 200 ps output to output skew (-1h, -2h, -5h) all outputs equally loaded 200 ps output bank a to output bank b (-1, -4, -2h, -5h) all outputs equally loaded 200 ps output bank a to output bank b skew (-2, -3) all outputs equally loaded 400 ps delay, ref rising edge to fbk rising edge t 6 measured at vdd/2 250 ps device to device skew t 7 measured at vdd/2 on the fbk pins of devices 700 ps output slew rate t 8 measured between 0.8v an d 2v on -1h, -2h, -5h device using test circuit 2 1v/ns cycle to cycle jitter (-1, -1h, -4, -5h) t j measured at 66.67 mhz, loaded outputs, 15pf load 200 ps measured at 66.67 mhz, loaded outputs, 30pf load 200 measured at 133.3 mhz, loaded outputs, 15pf load 100 cycle to cycle jitter (-2, -2h, -3) t j measured at 66.67 mhz, loaded outputs, 30pf load 400 ps measured at 66.67 mhz, loaded outputs, 15pf load 400 pll lock time t lock stable power supply, valid clocks presented on ref and fbk pins 1ms
idt2308b 3.3 volt zero delay clock multiplier clock multiplier idt? 3.3 volt zero delay clock multiplier 7 idt2308b rev b 030509 operating conditions?industrial note 1 : applies to both ref and fbk. dc electrical characteristics?industrial symbol parameter conditions min. max. units v dd supply voltage 3 3.6 v t a operating temperature (ambient temperature) -40 +85 c c l load capacitance below 100 mhz ? 30 pf load capacitance from 100 mhz to 133 mhz ? 15 pf c in input capacitance 1 ?7pf parameter symbol conditions min. typ. max. units input high voltage level v ih 2v input low voltage level v il 0.8 v input low current i il v in = 0v 50 a input high current i ih v in = v dd 100 a output high voltage v oh i oh = -8 ma (-1, -2, -3, -4) i oh = -12 ma (-1h, -2h, -5h) 2.4 v output low voltage v ol i ol = 8 ma (-1, -2, -3, -4) i ol = 12 ma (-1h, -2h, -5h) 0.4 v power down current i dd_pd ref = 0mhz (s2 = s1 = h) 25 a supply current i dd unloaded outputs select inputs at v dd or gnd 100 mhz clka (-1, -2, -3, -4) 45 ma 100 mhz clka (-1h, -2h, -5h) 70 66 mhz clka (-1, -2, -3, -4) 32 66 mhz clka (-1h, -2h, -5h) 50 33 mhz clka (-1, -2, -3, -4) 18 33 mhz clka (-1h, -2h, -5h) 30
idt2308b 3.3 volt zero delay clock multiplier clock multiplier idt? 3.3 volt zero delay clock multiplier 8 idt2308b rev b 030509 switching characteristics?industrial note 1 : idt2308b-5h has maximum input frequency of 133.33 mhz and maximum output of 66.67 mhz. parameter symbol conditions min. typ. max. units output frequency t 1 30 pf load, all devices 10 100 mhz output frequency t 1 20 pf load, -1h, -2h, -5h devices 1 10 133.3 mhz output frequency t 1 15pf load, -1, -2, -3, -4 devices 10 133.3 mhz duty cycle = t2 t1 (-1, -2, -3, -4, -1h, -2h, -5h) measured at 1.4v, fout = 66.66 mhz, 30 pf load 40 50 60 % duty cycle = t2 t1 (-1, -2, -3, -4, -1h, -2h, -5h) measured at 1.4v, fout = 50 mhz, 15 pf load 45 50 55 % rise time (-1, -2, -3, -4) t 3 measured between 0.8v and 2v, 30pf load 2.2 ns rise time (-1, -2, -3, -4) t 3 measured between 0.8v and 2v, 15pf load 1.5 ns rise time (-1h, -2h, -5h) t 3 measured between 0.8v and 2v, 30pf load 1.5 ns fall time (-1, -2, -3, -4) t 4 measured between 0.8v and 2v, 30pf load 2.2 ns fall time (-1, -2, -3, -4) t 4 measured between 0.8v and 2v, 15pf load 1.5 ns fall time (-1h, -5h) t 4 measured between 0.8v and 2v, 30pf load 1.25 ns output to output skew on same bank (-1, -2, -3, -4) t 5 all outputs equally loaded 200 ps output to output skew (-1h, -2h, -5h) all outputs equally loaded 200 ps output bank a to output bank b (-1, -4, -2h, -5h) all outputs equally loaded 200 ps output bank a to output bank b skew (-2, -3) all outputs equally loaded 400 ps delay, ref rising edge to fbk rising edge t 6 measured at vdd/2 250 ps device to device skew t 7 measured at vdd/2 on the fbk pins of devices 700 ps output slew rate t 8 measured between 0.8v an d 2v on -1h, -2h, -5h device using test circuit 2 1v/ns cycle to cycle jitter (-1, -1h, -4, -5h) t j measured at 66.67 mhz, loaded outputs, 15pf load 200 ps measured at 66.67 mhz, loaded outputs, 30pf load 200 measured at 133.3 mhz, loaded outputs, 15pf load 100 cycle to cycle jitter (-2, -2h, -3) t j measured at 66.67 mhz, loaded outputs, 30pf load 400 ps measured at 66.67 mhz, loaded outputs, 15pf load 400 pll lock time t lock stable power supply, valid clocks presented on ref and fbk pins 1ms
idt2308b 3.3 volt zero delay clock multiplier clock multiplier idt? 3.3 volt zero delay clock multiplier 9 idt2308b rev b 030509 switching waveforms
idt2308b 3.3 volt zero delay clock multiplier clock multiplier idt? 3.3 volt zero delay clock multiplier 10 idt2308b rev b 030509 typical duty cycle 1 and i dd trends 2 for idt2308b-1, 2, 3, and 4
idt2308b 3.3 volt zero delay clock multiplier clock multiplier idt? 3.3 volt zero delay clock multiplier 11 idt2308b rev b 030509 typical duty cycle 1 and i dd trends 2 for idt2308b- 1h, 2h, and 5h
idt2308b 3.3 volt zero delay clock multiplier clock multiplier idt? 3.3 volt zero delay clock multiplier 12 idt2308b rev b 030509 test circuits thermal characteristics 16tssop thermal characteristics 16soic parameter symbol conditions min. typ. max. units thermal resistance junction to ambient ja still air 78 c/w ja 1 m/s air flow 70 c/w ja 3 m/s air flow 68 c/w thermal resistance junction to case jc 37 c/w parameter symbol conditions min. typ. max. units thermal resistance junction to ambient ja still air 120 c/w ja 1 m/s air flow 115 c/w ja 3 m/s air flow 105 c/w thermal resistance junction to case jc 58 c/w
idt2308b 3.3 volt zero delay clock multiplier clock multiplier idt? 3.3 volt zero delay clock multiplier 13 idt2308b rev b 030509 package outline and package dimensions (16-pin soic, 150 mil. narrow body) package dimensions are kept current with jedec publication no. 95 index area 1 2 16 d e seating plane a1 a e - c - b .10 (.004) c c l h h x 45 millimeters inches symbol min max min max a 1.35 1.75 .0532 .0688 a1 0.10 0.25 .0040 .0098 b 0.330.51.013.020 c 0.19 0.25 .0075 .0098 d 9.80 10.00 .3859 .3937 e 3.80 4.00 .1497 .1574 e 1.27 basic 0.050 basic h 5.80 6.20 .2284 .2440 h 0.250.50.010.020 l 0.401.27.016.050 0 8 0 8
idt2308b 3.3 volt zero delay clock multiplier clock multiplier idt? 3.3 volt zero delay clock multiplier 14 idt2308b rev b 030509 package outline and package dimensions (16-pin tssop, 4.40 mm body, 0.65 mm pitch) package dimensions are kept current with jedec publication no. 95 ordering information part / order number shipping packaging package temperature 2308b-1dc tubes 16-pin soic 0 to +70 c 2308b-1dci tubes 16-pin soic -40 to +85 c 2308b-1dcg tubes 16-pin soic 0 to +70 c 2308b-1dcgi tubes 16-pin soic -40 to +85 c 2308b-1dc8 tape and reel 16-pin soic 0 to +70 c 2308b-1dci8 tape and reel 16-pin soic -40 to +85 c 2308b-1dcg8 tape and reel 16-pin soic 0 to +70 c 2308b-1dcgi8 tape and reel 16-pin soic -40 to +85 c 2308b-1hdc tubes 16-pin soic 0 to +70 c 2308b-1hdci tubes 16-pin soic -40 to +85 c 2308b-1hdcg tubes 16-pin soic 0 to +70 c 2308b-1hdcgi tubes 16-pin soic -40 to +85 c 2308b-1hdc8 tape and reel 16-pin soic 0 to +70 c 2308b-1hdci8 tape and reel 16-pin soic -40 to +85 c 2308b-1hdcg8 tape and reel 16-pin soic 0 to +70 c 2308b-1hdcgi8 tape and reel 16-pin soic -40 to +85 c index area 1 2 16 d e1 e seating plane a 1 a a 2 e - c - b aaa c c l millimeters inches symbol min max min max a--1.20--0.047 a1 0.05 0.15 0.002 0.006 a2 0.80 1.05 0.032 0.041 b 0.19 0.30 0.007 0.012 c 0.09 0.20 0.0035 0.008 d 4.90 5.1 0.193 0.201 e 6.40 basic 0.252 basic e1 4.30 4.50 0.169 0.177 e 0.65 basic 0.0256 basic l 0.45 0.75 0.018 0.030 0 8 0 8 aaa -- 0.10 -- 0.004
idt2308b 3.3 volt zero delay clock multiplier clock multiplier idt? 3.3 volt zero delay clock multiplier 15 idt2308b rev b 030509 the idt2308b-1, -2, -3, and -4 are zero delay clock buffers with standard drive. the idt2308b-1h, -2h, and -5h are zero delay clock buffers with high drive. parts ordered with a ?g? after the tw o-letter package code are the pb-free configuration and are rohs compliant. while the information presented herein has been checked for both ac curacy and reliability, integrat ed device technology (idt) a ssumes no responsibility for either its use or for the infringement of any patents or other rights of third parties, which would result from its use. no other circuits, patents, or licenses are implied. this product is intended for us e in normal commercial applications. any ot her applications such as those requiring extended temperature range, high reliability, or other extraordinary environmental requirements are not recommended wi thout additional processing by idt. idt reserves the right to change any circuitry or specifications wi thout notice. idt does not authorize or warrant any idt product for use in life sup port devices or critical medical instruments. 2308b-1hpg tubes 16-pin tssop 0 to +70 c 2308b-1hpgi tubes 16-pin tssop -40 to +85 c 2308b-1hpgg tubes 16-pin tssop 0 to +70 c 2308b-1hpggi tubes 16-pin tssop -40 to +85 c 2308b-1hpg8 tape and reel 16-pin tssop 0 to +70 c 2308b-1hpgi8 tape and reel 16-pin tssop -40 to +85 c 2308b-1hpgg8 tape and reel 16-pin tssop 0 to +70 c 2308b-1hpggi8 tape and reel 16-pin tssop -40 to +85 c 2308b-2dc tubes 16-pin soic 0 to +70 c 2308b-2dci tubes 16-pin soic -40 to +85 c 2308b-2dcg tubes 16-pin soic 0 to +70 c 2308b-2dcgi tubes 16-pin soic -40 to +85 c 2308b-2dc8 tape and reel 16-pin soic 0 to +70 c 2308B-2DCI8 tape and reel 16-pin soic -40 to +85 c 2308b-2dcg8 tape and reel 16-pin soic 0 to +70 c 2308b-2dcgi8 tape and reel 16-pin soic -40 to +85 c 2308b-3dcg tubes 16-pin soic 0 to +70 c 2308b-3dcgi tubes 16-pin soic -40 to +85 c 2308b-3dcg8 tape and reel 16-pin soic 0 to +70 c 2308b-3dcgi8 tape and reel 16-pin soic -40 to +85 c 2308b-4dc tubes 16-pin soic 0 to +70 c 2308b-4dci tubes 16-pin soic -40 to +85 c 2308b-4dcg tubes 16-pin soic 0 to +70 c 2308b-4dcgi tubes 16-pin soic -40 to +85 c 2308b-4dc8 tape and reel 16-pin soic 0 to +70 c 2308b-4dci8 tape and reel 16-pin soic -40 to +85 c 2308b-4dcg8 tape and reel 16-pin soic 0 to +70 c 2308b-4dcgi8 tape and reel 16-pin soic -40 to +85 c 2308b-5hpg tubes 16-pin tssop 0 to +70 c 2308b-5hpgi tubes 16-pin tssop -40 to +85 c 2308b-5hpgg tubes 16-pin tssop 0 to +70 c 2308b-5hpggi tubes 16-pin tssop -40 to +85 c 2308b-5hpg8 tape and reel 16-pin tssop 0 to +70 c 2308b-5hpgi8 tape and reel 16-pin tssop -40 to +85 c 2308b-5hpgg8 tape and reel 16-pin tssop 0 to +70 c 2308b-5hpggi8 tape and reel 16-pin tssop -40 to +85 c part / order number shipping packaging package temperature
idt2308b 3.3 volt zero delay clock multiplier clock multiplier idt? 3.3 volt zero delay clock multiplier 16 idt2308b rev b 030509 revision history rev. originator date description of change 11/2008 11/2008 initial release. b d. larson 03/05/09 updated part ordering to include 2308b-3dcg and -3dcgi.
? 2006 integrated device technology, inc. all rights reserved. product specifications subject to change without notice. idt and the idt logo are trademarks of integrated device technology, inc. accelerated thinking is a service mark of integrated device technology, inc. all other brands, product names a nd marks are or may be trademarks or registered trademarks used to identify products or services of their respective owners. printed in usa corporate headquarters integrated device technology, inc. www.idt.com for sales 800-345-7015 408-284-8200 fax: 408-284-2775 for tech support www.idt.com/go/clockhelp innovate with idt and accelerate your future netw orks. contact: www.idt.com idt2308b 3.3 volt zero delay clock multiplier clock multiplier

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