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SIT8919B Datasheet(PDF) 9 Page - SiTime Corp. |
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SIT8919B Datasheet(HTML) 9 Page - SiTime Corp. |
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9 / 18 page  The Smart Timing Choice The Smart Timing Choice SiT8919B High Frequency, High Temperature Oscillator Rev. 1.01 Page 9 of 13 www.sitime.com Pin 1 Configuration Options (OE, ST, or NC) Pin 1 of the SiT8919 can be factory-programmed to support three modes: Output enable (OE), standby (ST) or No Connect (NC). These modes can also be programmed with the Time Machine using field programmable devices. Output Enable (OE) Mode In the OE mode, applying logic Low to the OE pin only disables the output driver and puts it in Hi-Z mode. The core of the device continues to operate normally. Power consumption is reduced due to the inactivity of the output. When the OE pin is pulled High, the output is typically enabled in <1µs. Standby (ST) Mode In the ST mode, a device enters into the standby mode when Pin 1 pulled Low. All internal circuits of the device are turned off. The current is reduced to a standby current, typically in the range of a few µA. When ST is pulled High, the device goes through the “resume” process, which can take up to 5 ms. No Connect (NC) Mode In the NC mode, the device always operates in its normal mode and output the specified frequency regardless of the logic level on pin 1. Table 12 below summarizes the key relevant parameters in the operation of the device in OE, ST, or NC mode. Output on Startup and Resume The SiT8919 comes with gated output. Its clock output is accurate to the rated frequency stability within the first pulse from initial device startup or resume from the standby mode. In addition, the SiT8919 has NO RUNT, NO GLITCH output during startup or resume as shown in the waveform captures in Figure 17 and Figure 18. Figure 17. Startup Waveform vs. Vdd Figure 18. Startup Waveform vs. Vdd (Zoomed-in View of Figure 17) Instant Samples with Time Machine and Field Programmable Oscillators SiTime supports a field programmable version of the SiT8919 high frequency, high temperature oscillator for fast prototyping and real time customization of features. The field program- mable devices (FP devices) are available for all five standard SiT8919 package sizes and can be configured to one’s exact specification using the Time Machine II, an USB powered MEMS oscillator programmer. Customizable Features of the SiT8919 FP Devices Include • Frequencies between 115.194001 – 137 MHz • Four frequency stability options, ±20 PPM, ±25 PPM, ±30 PPM, ±50 PPM • Two operating temperatures, -40 to 105°C or -40 to 125°C • Six supply voltage options, 1.8V, 2.5V, 2.8V, 3.0V, 3.3V and 2.25 to 3.63V continuous • Output drive strength For more information regarding SiTime’s field programmable solutions, visit http://www.sitime.com/time-machine and http://www.sitime.com/fp-devices. SiT8919 is factory-programmed per customer ordering codes for volume delivery. Table 12. OE vs. ST vs. NC OE ST NC Active current 125 MHz (max, 1.8V) 6 mA 6 mA 6 mA OE disable current (max. 1.8V) 4.5 mA N/A N/A Standby current (typical 1.8V) N/A 0.6 uA N/A OE enable time at 125 MHz (max) 130 ns N/A N/A Resume time from standby (max, all frequency) N/A 5 ms N/A Output driver in OE disable/standby mode High Z weak pull-down N/A Clock Output Vdd Clock Output Vdd |
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