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DSC2111FI2-E0019 Datasheet(PDF) 3 Page - Micrel Semiconductor |
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DSC2111FI2-E0019 Datasheet(HTML) 3 Page - Micrel Semiconductor |
3 / 6 page Micrel, Inc. DSC2111FI2-E0019 Operational Description The DSC2111FI2-E0019 is a dual output LVCMOS oscillator consisting of a MEMS resonator and a supporting PLL IC. The two LVCMOS outputs are generated through independent 8-bit programmable dividers from the output of the internal PLL. DSC2111FI2-E0019 allows for easy programming of theoutput frequencies using I2C interface. Upon power-up, the output frequencies are controlled by an internal pre-programmed memory (OTP). This memory stores all coefficients required by the PLL for two different default frequency pairs. The control pin (FS) selects the initial pair. Once the device is powered up, a new output frequency pair can be programmed using I2C pins. Programming details are provided in the Programming Guide. The DSC2111FI2-E0019 has independent control of the output voltage levels of the two outputs. The high voltage level of CLK1 is equal to the main supply voltage, VDD (pin 13). VDD2 (pin 12) sets the high voltage level of CLK2. VDD2 must be equal to or less than VDD at all times to insure proper operation. VDD2 can be as low as 1.65V. When OE (pin 1) is floated or connected to VDD, the DSC2111FI2-E0019 is in operational mode. Driving OE to ground will disable both output drivers (hi-impedance mode). DSC2111FI2-E0019 has programmable output drive strength, which can be controlled via I2C. Table 1 displays typical rise / fall times for the output with a 15pF load capacitance as a function of these control bits at VDD = 3.3V and room temperature. Output Drive Strength Bits [OXS2, OXS1, OXS0] - Default is [111] - X = 1 for CLK1, and 2 for CLK2 000 001 010 011 100 101 110 111 tr (ns) 2.1 1.7 1.6 1.4 1.3 1.3 1.2 1.1 tf (ns) 2.5 2.4 2.4 2 1.8 1.6 1.3 1.3 Table 1. Rise/Fall Times for Drive Strengths Output Clock Frequencies Frequency select bits are weakly tied high so if left unconnected the default setting will be [1] and the device will output the associated frequency highlighted in bold. Freq (MHz) Freq Select Bit [FS] - Default is [1] 0 1 CLK1 74.25 74.25 CLK2 148.5 148.5 Table 2. Pin-Selectable Output Frequencies Absolute Maximum Ratings Item Min. Max. Units Condition Supply Voltage -0.3 +4.0 V Input Voltage -0.3 VDD + 0.3 V Junction Temp - +150 °C Storage Temp -55 +150 °C Soldering Temp - +260 °C 40sec max. ESD HBM MM CDM - 4000 400 1500 V 1000+ years of data retention on internal memory May 13, 2015 3 Revision 1.0 tcghelp@micrel.com or (408) 955-1690 2982 |
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