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78K0/KF2 uPD78F0547GC-8BT VT-200 uPD78F0547GC D-63263 uPD780547GC - Datasheet Archive
11-Apr-06 Evaluation of Subsystem Clock Oscillation Circuit [uPD78F0547GC-8BT] QFP(14x14) 0.65mm pitch Measurement conditions :
78K0/KF2 78K0/KF2 11-Apr-06 Evaluation of Subsystem Clock Oscillation Circuit [uPD78F0547GC-8BT uPD78F0547GC-8BT] QFP(14x14) 0.65mm pitch Measurement conditions : 5.0V , 3.3V Model Vdd=1.8 to 5.5V :VT-200 VT-200 IC Frequency :Fo=32.768kHz Frequency tolerance :dF/Fo= +/-20x10-6 Load capacitance :CL=12.5pF 0.1x10-6F REGC Equivalent series resistance :R1=50kohm max Max. Drive level :DL=x10-6W max Recommended drive level :DL=0.1x10-6W typ FEATURES Rf DIMENSIONS(VT-200 VT-200) 2.0 environmental characteristics. Portable applications (0.45) 0.2 3.Excellent shock resistance and 4.Real time clocks, Timers, Rd Ix 1.Compact tubular package 2.Photolithographic process Xout Xin 6.0max. 5.0min. 32.768kHz Cg Cd Vss Unit:mm CL= CgCd / (Cg+Cd)+Cs Remark) Ix : current through crystal MODEL:VT-200 VT-200 12.5pF with uPD78F0547GC uPD78F0547GC at 25°C Key specifications Current control resistance : Rd ( k ohm ) Capacitance at gate : Cg ( pF ) Capacitance at drain : Cd ( pF ) Vdd=3.3V 100 15 15 Remarks Vdd=5.0V 100 Control drive level & secure phase margin 18 Optimal capacity in response to CL ( CL = Cd // Cg + stray capacitance ) 15 Circuit characteristics ( at 25°C ) Matching Accuracy : df / f ( x10-6 ) Voltage Fluctuation : +/-df / V ( x10-6 ) Drive Level : DL ( x10-6W ) Negative resistance : | - RL | ( kohm ) Oscillation allowance : M ( times ) Voltage of oscillation start : Vstart (V ) Voltage of oscillation stop : Vstop (V ) Oscillation start up time : Ts ( sec ) Vdd=3.3V -0.3 1.3 0.31 271 5.4 1.53 1.50 1.03 Vdd=5.0V 0.9 1.2 0.51 391 7.8 1.53 1.50 0.76 Vdd=3.3V -136 -131 Vdd=5.0V Remarks -135 Typ.Tp=25°C ( K = -3.5×10-8 / °C2 ) -132 Typ.Tp=25°C ( K = -3.5×10-8 / °C2 ) Temperature characteristics of circuit -6 at -40°C Variation : df / T ( x10 ) at +85°C Variation : df / T ( x10-6 ) Remarks Frequency offset volume at specified Vdd Vdd +/-10% ( Standard operating voltage range ) DL=Ix2 Re < 1x10-6W,Re=R1( 1 + Co / CL )2 5 times larger than R1MAX Judgemental standard of oscillation stability Time to reach 90% of output level The above mentioned value is only for your reference. The value is for the arbitrary samples and does not guarante the product's characteristics. Please review and check above parameters at customer's end. Seiko Instruments USA Inc. Seiko Instruments 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 1-8,Nakase,Mihama-ku,Chiba-shi,Chiba 261-8507,Japan Facsimile :+81-43-211-8030 E-mail :component@sii.co.jp Seiko Instruments GmbH Siemensstrasse 9,D-63263 D-63263 Neu-lsenburg,Germany Telephone :+49-6102-297-0 Facsimile :+49-6102-297-320 Email :info@seiko-instruments.de Seiko Instruments Inc. Phone:+81-43-211-1207(Direct) 78K0/KF2 78K0/KF2 Evaluation of Subsystem Clock Oscillation Circuit [uPD78F0547GC-8BT uPD78F0547GC-8BT] QFP(14x14) 0.65mm pitch Measurement conditions : 5.0V , 3.3V SUB_Vout(V) Output signal wave from the oscillator MODEL : VT-200 VT-200 12.5pF with uPD78F0547GC uPD78F0547GC 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -50 -25 0 25 50 SUB_Vout(V) Test Data Output signal wave from the oscillator MODEL : VT-200 VT-200 12.5pF with uPD78F0547GC uPD78F0547GC 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -50 -25 0 25 50 Start up time of SUB_Vout MODEL : VT-200 VT-200 12.5pF with uPD78F0547GC uPD78F0547GC 5.5 5.0 4.5 Vdd 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 Time(x10-6sec) at Vdd=5.0V, 25°C Start up time of SUB_Vout MODEL : VT-200 VT-200 12.5pF with uPD78F0547GC uPD78F0547GC 5.5 5.0 Vdd 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 BUS_Vout(V) SUB_Vout(V) Time(x10-6sec) at Vdd=3.3V,25°C -0.2 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 -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, 25°C Time(sec) at Vdd=3.3V, 25°C ee -6 Vdd H uPD78F0547GC uPD78F0547GC L Xin Xout X'tal Rd SUB_Vout Cg Cd Vss Temperature characteristics of oscillating frequency MODEL : VT-200 VT-200 12.5pF with uPD78F0547GC uPD78F0547GC Oscillating Frequency (x10 ) Test Circuit MODEL : VT-200 VT-200 12.5pF with uPD78F0547GC uPD78F0547GC H : 1,9,31 L : 2,8,11,30 Xin : 15 Xout :16 Recommended Values X'tal : VT-200 VT-200 +/-20/12.5pF Vdd=3.3V and 5.0V Rd=100 kohm Cg=15 to 18pF typ Cd=15pF typ Ta=-40 to 85°C 0 -50 -100 -150 -200 -50 -25 0 25 50 75 100 Temperature(°C) at Vdd=3.3 and 5.0V Seiko Instruments Inc. Phone:+81-43-211-1207(Direct) 78K0/KF2 78K0/KF2 Evaluation of Subsystem Clock Oscillation Circuit [uPD78F0547GC-8BT uPD78F0547GC-8BT] QFP(14x14) 0.65mm pitch Measurement conditions : 5.0V , 3.3V Test Data : Temperature characteristics Temperature characteristics of Oscillating Voltage MODEL : VT-200 VT-200 12.5pF with uPD78F0547GC uPD78F0547GC 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -60 -40 -20 0 20 40 60 80 100 Oscillating SUB_Vout(Vp-p) Oscillating SUB_Vout(Vp-p) Temperature characteristics of Oscillating Voltage MODEL : VT-200 VT-200 12.5pF with uPD78F0547GC uPD78F0547GC 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0.0 -60 -40 -20 0 20 40 60 80 100 Temperature(°C) at Vdd=3.3V Temperature(°C) at Vdd=5.0V Temperature characteristics of Vstart, Vstop MODEL : VT-200 VT-200 12.5pF with uPD78F0547GC uPD78F0547GC 3.0 Vstart(V) 2.5 Vstop(V) 2.0 1.5 1.0 0.5 Voltage of Vstart, Vstop(V) Voltare of Vstart, Vstop (V) Temperature characteristics of Vstart, Vstop MODEL : VT-200 VT-200 12.5pF with uPD78F0547GC uPD78F0547GC 3.0 Vstop(V) 2.0 1.5 1.0 0.5 0.0 0.0 -60 -40 -20 0 20 40 60 -60 -40 -20 80 100 Temperature(°C) at Vdd=3.3V Start up time of SUB_Vout (sec) Temperature characteristics of start up time MODEL : VT-200 VT-200 12.5pF with uPD780547GC uPD780547GC 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -60 -40 -20 0 20 40 60 80 100 0 20 40 60 80 100 Temperature(°C) at Vdd=5.0V Temperature(°C) at Vdd=3.3V Start up time of SUB_Vout (sec) Vstart(V) 2.5 Temperature characteristics of start up time MODEL : VT-200 VT-200 12.5pF with uPD780547GC uPD780547GC 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -60 -40 -20 0 20 40 60 80 100 Temperature(°C) at Vdd=5.0V Seiko Instruments Inc. Phone:+81-43-211-1207(Direct) 78K0/KF2 78K0/KF2 Evaluation of Subsystem Clock Oscillation Circuit [uPD78F0547GC-8BT uPD78F0547GC-8BT] QFP(14x14) 0.65mm pitch Measurement conditions : 5.0V , 3.3V Referential components layout(see Figure 1) 60 41 61 40 78K0/KF2 78K0/KF2 Top View AVref:59 (H) Vdd:19 (H) Evdd:20(H) AVss:60 (L) Vss:17(L) Evss:18(L) FLMD0:13(L) XT1:12 (SUB_in) XT2:11 (SUB_out) RESET:10 REGC:16 17 20 80 Rd 1 GND Cd VT-200 VT-200 12.5pF Cg GND Figure 1 Referential components layout 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). Avoid Signal A Signal B Cg SUB_in Cd SUB_out Vss Figure 2 Example of Incorrect Board Design Remark When using the subsystem clock, insert resistors Rd in series on the SUB_out side. Seiko Instruments Inc. Phone:+81-43-211-1207(Direct) 78K0/KF2 78K0/KF2 Evaluation of Subsystem Clock Oscillation Circuit [uPD78F0547GC-8BT uPD78F0547GC-8BT] QFP(14x14) 0.65mm pitch Measurement conditions : 5.0V , 3.3V [Evaluation Sample : VT-200 VT-200 12.5pF at 25°C] SAMPLE VT-200 VT-200 12.5pF No. 1 2 3 CL( pF ) 12.5 12.5 12.5 Fo( Hz ) 32768.11 32768.09 32768.34 fr( Hz ) 32765.28 32765.24 32765.45 R1( kohm ) 27.4 26.9 29.9 Co( pF ) 0.91 0.89 0.93 C1( fF ) 2.319 2.333 2.368 Q( k ) 76.5 77.4 68.6 [IC Test Data : IC Sample Rd=100 kohm,Cg=18pF,Cd=15pF at 25°C] Vdd( V ) IC Sample Fosc( Hz ) df / f( x10-6 ) 5.0 CC LLL HLC HHC HHH 32768.14 32768.16 32768.13 32768.10 32768.09 DL(x10-6W) | -RL |( kohm ) 0.92 1.46 0.70 -0.31 -0.73 0.51 0.45 0.49 0.56 0.56 391.47 391.47 391.47 361.47 361.47 Vstart( V ) Ts(sec) 1.53 1.52 1.51 1.60 1.58 0.76 0.79 0.77 0.82 0.83 [IC Test Data : IC Sample Rd=100 kohm,Cg=15pF,Cd=15pF at 25°C] Vdd( V ) IC Sample Fosc( Hz ) df / f( x10-6 ) 3.3 CC LLL HLC HHC HHH 32768.10 32768.10 32768.09 32768.04 32768.04 -0.31 -0.15 -0.67 -2.01 -2.14 Remark ( see figure 3 ) DL(x10-6W) | -RL |( kohm ) 0.31 0.27 0.28 0.31 0.31 L1 C1 271.47 301.47 301.47 251.47 251.47 R1 Fo = fr ×{ C1/ ( 2×( Co + CL ) + 1 } ( Hz ) CL C0 Crystal unit Vstart( V ) Ts(sec) 1.53 1.52 1.51 1.60 1.58 1.03 0.97 1.00 1.17 1.20 Fo : Load resonance frequency fr : Resonance frequency R1 : Motional resistance C1 : Motional capacitance Co : Shunt capacitance CL : Load Capacitance Figure 3 Equivalent circuit of crystal unit, and CL Cos Remark ( see figure 4) Approximate formula of the load capacitance of the circuit CL. X1(SUB_in) X2(SUB_out) CL = Cg×Cd / (Cg + Cd) + Cs (pF) Cds Cgs Where Cs Stands for stray capacitance of the circuit. Vss 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)