rtc real time clock oscillation circuit [s-35190a/s-35390a] 8pin tssop(3.0x4.4) 0.65mm pitch measurement conditions : 5.0v , 3.0v model :sp-t2a frequency :fo=32.768khz frequency tolerance :df/fo= +/-20x10 -6 load capacitance :cl=6.0pf equivalent series resistance :r1=50k ohm max max. drive level :dl=1x10 -6 w max recommended drive level :dl=0.1x10 -6 w typ features recommended soldering pattern 1. plastic mold package incorporated tubular type quartz crystal. 2. suitable for automatic and high density surface mounting. 3. excellent shock and heat resistance 4. real time clocks, timers, remark) ix : current through crystal portable applications,clock source for micro-computers model:sp-t2a 6.0pf with s35190a/S35390A at 25c the above mentioned value is only for your reference. the value is for the arbitrary samples and does not guarantee the product's characteristics. please review and check above parameters at customer's end. seiko instruments usa inc. 2990,west lomita blvd., torrance, ca 90505, u.s.a telephone :+1 310-517-7771 facsimile :+1 310-517-7792 email :crystals@siu-la.com seiko instruments gmbh siemensstrasse 9,d-63263 neu-lsenburg,germany telephone :+49-6102-297-0 facsimile :+49-6102-297-320 email :info@seiko-instruments.de seiko instruments inc. 1-8,nakase,mihama-ku,chiba-shi,chiba 261-8507,japan facsimile :+81-43-211-8030 e-mail :component@sii.co.jp seiko instruments inc. phone:+81-43-211-1207(direct) typ.tp=25c ( k = -3.510 -8 / c 2 ) control drive level & secure phase margin remarks frequency offset volume at specified vdd vdd +/-10% ( standard operating voltage range ) remarks typ.tp=25c ( k = -3.510 -8 / c 2 ) dl=ix 2 re < 1x10 -6 w,re=r1( 1 + co / cl ) 2 5 times larger than r 1max judgemental standard of oscillation stability vdd=5.0v time to reach 90% of output level -132 -137 13.5 0.32 variation : df / t ( x10 -6 ) -132 at -40c at +85c oscillation allowance : m ( times ) oscillation start up time : ts ( sec ) temperature characteristics of circuit variation : df / t ( x10 -6 ) 0.01 674 674 drive level : dl ( x10 -6 w ) negative resistance : | - rl | ( kohm ) built-in 0.0 -1.9 0.01 current control resistance : rd ( k ohm ) capacitance at drain : cd ( pf ) capacitance at gate : cg ( pf ) vdd=3.0v built-in 3 built-in 31-jan-07 key specifications vdd=5.0v vdd=3.0v matching accuracy : df / f ( x10 -6 ) voltage fluctuation : +/-df / v ( x10 -6 ) circuit characteristics ( at 25c ) remarks optimal capacity in response to cl ( cl = cd // cg + stray capacitance ) -137 vdd=3.0v -1.9 0.0 vdd=5.0v 13.5 0.33 built-in 3 cl= cgcd / (cg+cd)+cs vss rtc-ic xin xout vdd=1.3 to 5.5v ix 32.768khz rd cd cg rf=100mohm typ rd=100kohm typ cd=8pf typ rf unit:mm 1.3 1.3 1.3 4.2 1. 9 1. 9
rtc real time clock oscillation circuit [s-35190a/s-35390a] 8pin tssop(3.0x4.4) 0.65mm pitch measurement conditions : 5.0v , 3.0v test data seiko instruments inc. phone:+81-43-211-1207(direct) -0.2 0.0 0.2 0.4 0.6 0.8 1.0 -40 -20 0 20 40 time(x10 -6 sec) at vdd=3.0v,25c sub_vout(v) -0.2 0.0 0.2 0.4 0.6 0.8 1.0 -40 -20 0 20 40 time(x10 -6 sec) at vdd=5.0v, 25c sub_vout(v) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time(sec) at vdd=3.0v, 25c sub_vout(v) 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 time(sec) at vdd=5.0v, 25c bus_vout(v) s35190a/S35390A h l xin xout vss vdd sub_vout cg x'tal test circuit model : sp-t2a 6.0pf with s35190/s35390 h : 8 l : 4 xin : 3 xout : 2 int:1 recommended values x?tal : sp-t2a +/-20/6.0pf vdd=3.0v and 5.0v cg=3pf typ ta=-40 to 85c vdd vdd start up time of sub_vout model : sp-t2 6.0pf with s35190a/S35390A start up time of sub_vout model : sp-t2a 6.0pf with s35190a/S35390A output signal wave from the oscillator model : sp-t2a 6.0pf with s35190a/S35390A output signal wave from the oscillator model : sp-t2a 6.0pf with s35190a/S35390A -200 -150 -100 -50 0 -50 -25 0 25 50 75 100 temperature(c) at vdd=3.0 to 5.0v oscillating fr equency (x10 -6 ) temperature characteristics of oscillating frequency model : sp-t2 6.0pf with s35190a/S35390A
rtc real time clock oscillation circuit [s-35190a/s-35390a] 8pin tssop(3.0x4.4) 0.65mm pitch measurement conditions : 5.0v , 3.0v test data : temperature characteristics seiko instruments inc. phone:+81-43-211-1207(direct) 0.0 0.3 0.5 0.8 1.0 1.3 1.5 1.8 2.0 -60 -40 -20 0 20 40 60 80 100 temperature(c) at vdd=3.0v oscillating sub_vout(vp-p) 0.0 0.3 0.5 0.8 1.0 1.3 1.5 1.8 2.0 -60 -40 -20 0 20 40 60 80 100 temperature(c) at vdd=5.0v oscillating sub_vout(vp-p) 0.0 0.3 0.5 0.8 1.0 1.3 1.5 1.8 2.0 -60 -40 -20 0 20 40 60 80 100 temperature(c) at vdd=3.0v voltare of vstart, vstop (v) vstart(v) vstop(v) 0.0 0.3 0.5 0.8 1.0 1.3 1.5 1.8 2.0 -60 -40 -20 0 20 40 60 80 100 temperature(c) at vdd=5.0v voltage of vstart, vstop(v) vstart(v) vstop(v) temperature characteristics of oscillating voltage model : sp-t2a 6.0pf with s35190a/S35390A temperature characteristics of oscillating voltage model : sp-t2a 6.0pf with s35190a/S35390A temperature characteristics of vstart, vstop model : sp-t2a 6.0pf with s35190a/S35390A temperature characteristics of vstart, vstop model : sp-t2a 6.0pf with s35190a/S35390A 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 -60 -40 -20 0 20 40 60 80 100 temperature(c) at vdd=3.0v start up time of sub_vout (sec) temperature characteristics of start up time model : sp-t2a 6.0pf with s35190a/S35390A 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 -60 -40 -20 0 20 40 60 80 100 temperature(c) at vdd=5.0v start up time of sub_vout (sec) temperature characteristics of start up time model : sp-t2a 6.0pf with s35190a/S35390A
rtc real time clock oscillation circuit [s-35190a/s-35390a] 8pin tssop(3.0x4.4) 0.65mm pitch measurement conditions : 5.0v , 3.0v referential components layout(see figure 1 ) figure 1 referential components layou t notes board design when using a crystal resonator, place the resonator and its load capacitors as close as possible to sub_in and sub_out pins. other signal lines should be routed away from the resonator circuit to prevent induction from interfering with correct oscillation (see figure 2). a void signal a signal b figure 2 example of incorrect board design seiko instruments inc. phone:+81-43-211-1207(direct) sub_in sub_ou t cg vss vdd:8(h) vss:4 (l) x1:3 (sub_in) x2:2 (sub_out) int:1(1hz_out) sp-t2a 6.0pf 1 2 3 4 8 7 6 5 s35190/s35390 top view c
rtc real time clock oscillation circuit [s-35190a/s-35390a] 8pin tssop(3.0x4.4) 0.65mm pitch measurement conditions : 5.0v , 3.0v [evaluation sample : sp-t2a 6.0pf at 25c] sample no. cl( pf ) fo( hz ) fr( hz ) r1( kohm ) co( pf ) c1( ff ) q( k ) 1 6.0 32768.34 32763.01 31.6 0.94 2.258 68.1 2 6.0 32768.29 32762.96 33.0 0.94 2.258 65.2 3 6.0 32768.28 32762.95 31.5 0.93 2.255 68.4 [ic test data : ic samples cg=3pf at 25c] vdd( v ) ic samples fosc( hz ) df / f( x10 -6 ) dl(x10 -6 w) | -rl |( kohm ) vstart( v ) ts(sec) #15_typ 32768.23 -1.85 0.01 674 0.55 0.32 #17_hhd 32768.24 -1.55 0.01 724 0.63 0.30 #19_hld 32768.11 -5.45 0.01 724 0.66 0.30 #21_lhd 32768.33 1.19 0.01 674 0.38 0.33 #23_lld 32768.21 -2.45 0.01 794 0.64 0.39 #15_typ 32768.23 -1.85 0.01 674 0.55 0.33 #17_hhd 32768.24 -1.55 0.01 724 0.63 0.32 #19_hld 32768.11 -5.45 0.01 724 0.66 0.30 #21_lhd 32768.33 1.19 0.01 674 0.38 0.34 #23_lld 32768.21 -2.45 0.01 794 0.64 0.43 remark ( see figure 3 ) fo : load resonance frequency fr : resonance frequency fo = fr { c1/ ( 2( co + cl )) + 1 } ( hz ) r1 : motional resistance c1 : motional capacitance co : shunt capacitance cl : load capacitance figure 3 equivalent circuit of crystal unit, and cl remark ( see figure 4) approximate formula of the load capacitance of the circuit cl. cl = cgcd / (cg + cd) + cs (pf) where cs (=2 to 4pf) stands for stray capacitance of the circuit. cos : x1_x2 stray capacitance cgs : x1_vss stray capacitance cds : x2_vss stray capacitance figure 4 stray capacitance cos,cgs,cds of the circuit resonator circuit constants will differ depending on the resonator element, stray capacitance in its interconnecting circuit, and other factors. suitable constants should be determined in consultation with the resonator element manufacturer. seiko instruments inc. phone:+81-43-211-1207(direct) 5.0 3.3 sp-t2a 6.0pf l 1 c 1 r 1 c 0 cl crystal unit cos cgs cds x1(sub_in) x2(sub_out) vss
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