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EVK-SH3000USB Datasheet(PDF) 4 Page - Semtech Corporation |
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EVK-SH3000USB Datasheet(HTML) 4 Page - Semtech Corporation |
4 / 30 page 4 ©2006 Semtech Corp. SH3003 www.semtech.com Not authorized for release outside of Semtech - DRAFT POWER MANAGEMENT Parameter Symbol Min Typ Max Units Crystal operating frequency F OP 32.768 kHz CLK32 duty cycle DC 25 75 % Start-up time T ST 3 secs XIN/XOUT padding capacitance after power-up C PUP 12.5 pF Minimum X IN/XOUT padding capacitance C MIN 10 pF Maximum X IN/XOUT padding capacitance C MAX 40 pF Padding capacitance resolution C RES 2pF X IN switching threshold V TH 0.6 V X IN to CLK32 delay T D 0.5 ppm/°C CLK32 frequency stability (crystal-dependent) F S 1 μs CLK32 cycle-to-cycle jitter J 0.05 % CLK32 rise/fall time (10pF load) T RF 10 ns CLK32 logic output low (0.5mA load) V OL 0.25 0.5 V CLK32 logic output high (0.5mA load) V OH -0.5 -0.25 Ref VDD* Crystal Oscillator *Note: VDD here is VDD during normal operation and VBAK during battery backup. Parameter Symbol Min Typ Max Units External 1MΩ referenced nominal frequency F EXT 32.768 kHZ Internal 1MΩ referenced nominal frequency F INT 32.768 kHZ CLK32 duty cycle* DC 40 60 % Programmed frequency accuracy at 25°C F ST -1 +1 % Absolute accuracy (temp. & supply external 1MΩ)F DE ±2 % Absolute accuracy (temp. & supply internal 1MΩ) F DI ±3 % Frequency temperature stability (ext. 1MΩ)F SE 100 ppm/°C Frequency temperature stability (int. 1MΩ)F SI 200 ppm/°C Power on start-up time T ST 70 μs CLK32 cycle-to-cycle jitter* J 0.1 % 32.768kHz RC Oscillator *Note: After power-up, pin CLK32 is disabled, pin RREF is also disabled, and the oscillator is set to operate without the external reference resistor. Electrical Characteristics (continued) |
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Similar Description - EVK-SH3000USB |
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