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5V7855SWFR Datasheet(PDF) 6 Page - Integrated Device Technology |
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5V7855SWFR Datasheet(HTML) 6 Page - Integrated Device Technology |
6 / 14 page IDT5V7855-DPK REVISION A MARCH 11, 2010 6 ©2010 Integrated Device Technology, Inc. IDT5V7855 Data Sheet EEPROM PROGRAMMABLE PLL DIE FOR LVCMOS CRYSTAL OSCILLATOR Programming Instructions The IDT5V7855 registers, along with some control functions, are written and the EEPROM burned through a serial write using the CONT and OUT pins. During the programming the CONT pin functions as a Data input while the OUT pin functions as a Clock input. The data registers are not addressed individually but are all written sequentially with the most significant bit first. All registers must be written when programming the device. The order of registers / control bits and the number of bits per register are: 9 bits Tuning Capacitor Register T[8:0] 19 bits Fractional Multiplier Register M[18:0] 3 bits Prescaler Register P[2:0] 3 bits Factory Test Mode Register F[2:0] 1 bit PLL Bypass Mode (0 = crystal oscillator connected directly to output divider, 1 = PLL used) 1 bit Power Down Control (0 = CONT acts as an output enable, 1 = CONT acts as power down) 1 bit Output Enable Type (0 = synchronous output enable, 1 = asynchronous output enable) 7 bits Output Divider Register D[6:0] Table 3E. Register Table Register Name Tuning Capacitor Fractional Multiplier Prescaler (P) Factory Test Mode PLL Mode Power Down Control Output Enable Control Output Divider # of Bits 9-bit 19-bit 3-bit 3-bit 1-bit 1-bit 1-bit 7-bit Symbol T[8:0] M[18:0] P[2:0] F[2:0] D[6:0] |
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