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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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MC68HC908GR4MP 데이터시트(PDF) 255 Page - Freescale Semiconductor, Inc |
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MC68HC908GR4MP 데이터시트(HTML) 255 Page - Freescale Semiconductor, Inc |
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255 / 286 page  Clock Generation Module Characteristics MC68HC908GR8 • MC68HC908GR4 Data Sheet, Rev. 7 Freescale Semiconductor 255 23.8 Clock Generation Module Characteristics 23.8.1 CGM Component Specifications 23.8.2 CGM Electrical Specifications Characteristic Symbol Min Typ Max Unit Crystal reference frequency fXCLK 30 32.768 100 kHz Crystal load capacitance(1) 1. Crystal manufacturer value. CL — 12.5 — pF Crystal fixed capacitance(2) 2. Capacitor on OSC1 pin. Does not include parasitic capacitance due to package, pin, and board. C1 — 15 —pF Crystal tuning capacitance(2) C2 — 15 —pF Feedback bias resistor RB 110 22 M Ω Series resistor(3) 3. Capacitor on OSC2 pin. Does not include parasitic capacitance due to package, pin, and board. RS 100 330 470 k Ω Description Symbol Min Typ Max Unit Operating voltage VDD 2.7 — 5.5 V Operating temperature T –40 25 125 oC Crystal reference frequency fRCLK 30 32.768 100 kHz Range nominal multiplier fNOM — 38.4 — kHz VCO center-of-range frequency(1) 1. 5.0 V ± 10% V DD fVRS 38.4 k — 40.0 M Hz Medium-voltage VCO center-of-range frequency(2) 2. 3.0 V ± 10% V DD fVRS 38.4 k — 40.0 M Hz VCO range linear range multiplier L 1 — 255 VCO power-of-two range multiplier 2E 1—4 VCO multiply factor N 1 — 4095 VCO prescale multiplier 2P 118 Reference divider factor R 1 1 15 VCO operating frequency fVCLK 38.4 k — 40.0 M Hz Bus operating frequency(1) fBUS —— 8.2 MHz Bus frequency @ medium voltage(2) fBUS —— 4.1 MHz Manual acquisition time tLock —— 50 ms Automatic lock time tLock —— 50 ms PLL jitter(3) 3. Deviation of average bus frequency over 2 ms. N = VCO multiplier. fJ 0— fRCLK x 0.025% x 2P N/4 Hz External clock input frequency PLL disabled fOSC dc — 32.8 M Hz External clock input frequency PLL enabled fOSC 30 k — 1.5 M Hz |
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