2002/04/10 ( 1 / 4 ) nju6379 1.8v operation 3rd. over tone quartz crystal oscillator general description the nju6379 series is a c-mos ic for 3rd. over tone quartz crystal oscillator that consists of an oscillation amplifier and 3-state output buffer, and can oscillate at 1.8v very low voltage. the nju6379 has ability to oscillate from 60 to 70mhz. the oscillation amplifier is realized very low stand-by current using nand circuit. the 3-state output buffer is c-mos compatible. features operating voltage 1.8 to 2.8v maximum oscillation frequency (see line-up table) low operating current high fan-out i oh /i ol = 4ma @2.5v oscillation stop and output stand-by function 3-state output buffer oscillation capacitors cg and cg on-chip package outline thin-chip c-mos technology line-up table starting point:chip center unit[um] chip size:0.7x0.75mm thin-chip thickness:200 20um pad size:90x90um block diagram type no. recommended oscillation frequency range output frequency cg/cd nju6379 60 to 70 mhz f 0 8.5/9pf no pad name x y 1 cont -178 231 2 xt -178 77 3 xt -178 -77 4v ss -178 -231 5f out 206 -231 8v dd 206 231 product s p ecification nju6379c-d thin-chip cont xt v ss f out xt v dd package outline pad location coordinates cont xt xt cg cd rf buffer state 3 ? out f dd v ss v
2002/04/10 ( 2 / 4 ) nju6379 treminal description symbol function cont oscillation and 3-state output buffer control cont f out h or open output frequency f 0 l oscillation stop and high impedance output xt xt quartz crystal connecting terminals v ss v ss =0v f out frequency output v dd v dd =2.5v note1) refer to the line-up table. absolute maximum ratings (ta=25 c) parameter symbol rating unit supply voltage v dd -0.5 to +7.0 v input voltage v in v ss -0.5 to v dd +0.5 v output voltage v o -0.5 to v dd +0.5 v input current i in 10 ma output current i o 25 ma operating temperature range topr -40 to +85 c storage temperature range tstg -55 to +125 c note2) if the supply voltage(v dd ) is less than 7.0v, the input voltage must not over the v dd level though 7.0v is limit specified. note3) decupling capacitor should be connected between v dd and v ss due to the stabilized operation for the circuit.
2002/04/10 ( 3 / 4 ) nju6379 electrical characteristics (ta=25 c) parameter symbol conditions min typ max unit operating voltage v dd 1.8 2.8 v (v dd =2.5v,ta=25 c) parameter symbol conditions min typ max unit operating current i dd fosc=70mhz,c l =15pf 8 oscillation stopping current i stb cont =v ss , no load 2 5 ua stand-by current ist cont =xt=v ss , no load note4) 1 ua v ih 2 2.5 v input voltage v il 0 0.5 v i oh v oh =2.25v 4 ma output current i ol v ol =0.25v 4 ma cont =0.8v dd 7.5 12.0 ua input current i in cont =0.2v dd 1.2 2.0 ua 3-state off leakage current i oz cont =v ss , f out = v dd or v ss 0.1 ua feedback resistance rf xt=v dd 4.2 k ? internal capacitor cg/cd f osc =70mhz 8.5/9 pf maximum oscillation frequency f max 70 mhz output signal symmetry sym c l =15pf, @v dd /2 45 50 55 % output signal rise time tr c l =15pf,10%~90% 3 6 ns output signal fall time tf c l =15pf,90%~10% 3 6 ns output disable time t plz c l =15pf,r up =10k ? 200 ns output enable time t pzl c l =15pf,r up =10k ? 200 ns note4) excluding input current on cont terminal.
2002/04/10 ( 4 / 4 ) nju6379 measurment circuits (1)output signal symmetry(c l =15pf) (2)output signal rise/fall time(c l =15pf) (3)output disable/enable time(c l =15pf,r up =10k ? ) [caution] the specifications on this data book are only given for information , without any guarantee as regards either mistakes or omissions. the application circuits in this data book are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights. c l =15pf pulse generato r 1000pf 50 ? v dd v ss xt f out l 1/2v dd h c l =15pf pulse generato r 1000 p f 50 ? v dd v ss xt f out tr tf 90% 10% 50% r up =10k ? c l =15pf pulse generato r 50 ? v dd v ss xt f out cont t plz t pzl 0.2v dd v ol 0.8v dd v oh f out cont
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