1 commercial temperature range idt2305nzt 2.5v clock buffer january 2011 2011 integrated device technology, inc. dsc 7020/4 c commercial temperature range the idt logo is a registered trademark of integrated device technology, inc. features: ? clock distribution ? 10mhz to 133mhz operating frequency ? distributes one clock input to one bank of five outputs ? output skew < 250ps ? no external rc network required ? operates at 2.5v v dd ? available in soic package functional block diagram idt2305nzt 2.5v clock buffer 8 clk1 clk2 clk3 clk4 control logic ref 1 clkout 3 2 5 7 description: the idt2305nzt is a high-speed clock buffer, designed to address high-speed clock distribution applications. idt2305nzt accepts one reference input, and drives out five low skew clocks.
2 commercial temperature range idt2305nzt 2.5v clock buffer ref clk1 2 3 4 8 7 6 5 1 clk2 gnd clkout clk4 v dd clk3 pin configuration soic top view symbol rating max. unit v dd supply voltage range ?0.5 to +4.6 v v i (2) input voltage range (ref) ?0.5 to +5.5 v v i input voltage range ?0.5 to v (except ref) v dd +0.5 i ik (v i < 0) input clamp current ?50 ma i o (v o = 0 to v dd ) continuous output current 50 ma v dd or gnd continuous current 100 ma t a = 55c maximum power dissipation 0.7 w (in still air) (3) t stg storage temperature range ?65 to +150 c operating commercial temperature 0 to +70 c temperature range notes: 1. weak pull down. 2. weak pull down on all outputs. pin description absolute maximum ratings (1) applications: ? sdram ? telecom ? datacom ? pc motherboards/workstations ? critical path delay designs pin name pin number type functional description ref (1) 1 in input reference clock, 3.3v tolerant input clk2 (2) 2 out output clock clk1 (2) 3 out output clock gnd 4 gnd ground clk3 (2) 5 out output clock v dd 6 pwr 2.5v supply clk4 (2) 7 out output clock clkout (2) 8 out output clock notes: 1. stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect reliability. 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 junction temperature of 150c and a board trace length of 750 mils.
3 commercial temperature range idt2305nzt 2.5v clock buffer symbol parameter min. max. unit v dd supply voltage 2.3 2.7 v t a operating temperature (ambient temperature) 0 +70 c c l load capacitance 10mhz - 133mhz ? 15 pf c in input capacitance ? 7 pf operating conditions dc electrical characteristics symbol parameter conditions min. max. unit v il input low voltage level ? 0.7 v v ih input high voltage level 1.7 ? v i il input low current v in = 0v ? 50 a i ih input high current v in = v dd ? 100 a v ol output low voltage standard drive, i ol = 8ma ? 0.3 v v oh output high voltage standard drive, i oh = -8ma 2 ? v i dd_pd power down current ref = 0mhz ? 12 a i dd supply current unloaded outputs at 66.66mhz ? 32 ma switching characteristics (1,2) symbol parameter conditions min. typ. max. unit t 1 output frequency 15pf load 10 ? 133 mhz duty cycle = t 2 t 1 measured at v dd /2, f out = 66.66mhz 40 50 60 % t 3 rise time measured between 0.7v and 1.7v ? ? 2.5 ns t 4 fall time measured between 0.7v and 1.7v ? ? 2.5 ns t 5 output to output skew all outputs equally loaded ? ? 250 ps t 6 delay, ref rising edge to clkout rising edge measured at v dd /2 ? 0 8.7 ns t 7 device-to-device skew measured at v dd /2 on the clkout pins of devices ? 0 700 ps notes: 1. ref input has a threshold voltage of v dd /2. 2. all parameters specified with loaded outputs.
4 commercial temperature range idt2305nzt 2.5v clock buffer v dd outputs v dd gnd gnd 0.1 f 0.1 f c load clk out test circuit for all parameters test circuit output v dd /2 v dd /2 t5 output ref v dd/ 2 t6 output clk out device 1 t7 clk out device 2 v dd/ 2 v dd /2 v dd /2 v dd /2 v dd /2 t2 t1 v dd /2 1.7v 0.7v t3 t4 0.7v 2.5v 0v 1.7v output all outputs rise/fall time input to output propagation delay device to device skew output to output skew duty cycle timing switching waveforms
5 commercial temperature range idt2305nzt 2.5v clock buffer ordering information corporate headquarters for sales: for tech support: 6024 silver creek valley road 800-345-7015 or 408-284-8200 www.idt.com/go/clockhelp san jose, ca 95138 fax: 408-284-2775 www.idt.com part / order number shipping packaging package temperature 2305NZT-1DCG tubes 8-pin soic 0 to +70 c 2305NZT-1DCG8 tape and reel 8-pin soic 0 to +70 c "g" after the two-letter package code denotes pb free configuration, rohs complaint.
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