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CDCE62005 Datasheet(PDF) 23 Page - Texas Instruments |
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CDCE62005 Datasheet(HTML) 23 Page - Texas Instruments |
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23 / 85 page  /1:/2:HiZ /1:/2:HiZ Reference Divider /1 - /8 PRI_REF SEC_REF XTAL / AUX IN LVPECL : Up to 1500 MHz LVDS : Up to 800 MHz LVCMOS : Up to 250 MHz Crystal : 2 MHz – 42 MHz Smart MUX 1 Smart MUX2 Smart MUX Control 5 4 3 2 Register 5 REF _SEL 6 1 0 Register 5 1 0 Register 0 1 0 Register 1 8 9 12 Register 6 Universal Input Buffers Smart Multiplexer Auxiliary Input 0 1 0 Register 2 Register 3 250 MHz 250 MHz CDCE62005 www.ti.com SCAS862F – NOVEMBER 2008 – REVISED JANUARY 2015 8.3.4 External Control Pins REF_SEL REF_SEL provides a way to switch between the primary and secondary reference inputs (PRI_REF and SEC_REF) via an external signal. It works in conjunction with the smart multiplexer discussed in Input Block. Power_Down The Power_Down pin places the CDCE62005 into the power down state. The CDCE62005 loads the contents of the EEPROM into RAM after the Power_Down pin is de-asserted; therefore, it is used to initialize the device after power is applied. SPI_LE signal has to be HIGH in order for EEPROM to load correctly during the rising edge of Power_Down. SYNC The SYNC pin (Active LOW) has a complementary register location located in Device Register 8 bit 8. When enabled, Sync synchronizes all output dividers so that they begin counting simultaneously. Further, SYNC disables all outputs when in the active state. NOTE The output synchronization does not work for reference input frequencies less than 1 MHz. 8.3.5 Input Block The Input Block includes two Universal Input Buffers, an Auxiliary Input, and a Smart Multiplexer. The Input Block drives three different clock signals onto the Internal Clock Distribution Bus: buffered versions of both the primary and secondary inputs (PRI_REF and SEC_REF) and the output of the Smart Multiplexer. Figure 18. CDCE62005 Input Block With References to Registers Copyright © 2008–2015, Texas Instruments Incorporated Submit Documentation Feedback 23 Product Folder Links: CDCE62005 |
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