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21-0042 Datasheet(PDF) 10 Page - Maxim Integrated Products |
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21-0042 Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 20 page DS1339 I 2C Serial Real-Time Clock 10 of 20 Table 2. Crystal Specifications* PARAMETER SYMBOL MIN TYP MAX UNITS Nominal Frequency fO 32.768 kHz Series Resistance ESR 50 k Ω Load Capacitance CL 6 pF *The crystal, traces, and crystal input pins should be isolated from RF generating signals. Refer to Application Note 58: Crystal Considerations for Dallas Real-Time Clocks for additional specifications. CLOCK ACCURACY The accuracy of the clock is dependent upon the accuracy of the crystal and the accuracy of the match between the capacitive load of the oscillator circuit and the capacitive load for which the crystal was trimmed. Additional error is added by crystal frequency drift caused by temperature shifts. External circuit noise coupled into the oscillator circuit may result in the clock running fast. Figure 4 shows a typical PC board layout for isolating the crystal and oscillator from noise. Refer to Application Note 58: Crystal Considerations with Dallas Real-Time Clocks for detailed information DS1339C ONLY The DS1339C integrates a standard 32,768Hz crystal in the package. Typical accuracy at nominal VCC and +25°C is approximately 10ppm. Refer to Application Note 58 for information about crystal accuracy vs. temperature. Figure 4. Typical PC Board Layout for Crystal LOCAL GROUND PLANE (LAYER 2) CRYSTAL X1 X2 GND NOTE: AVOID ROUTING SIGNALS IN THE CROSSHATCHED AREA (UPPER LEFT-HAND QUADRANT) OF THE PACKAGE UNLESS THERE IS A GROUND PLANE BETWEEN THE SIGNAL LINE AND THE PACKAGE. |
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