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PLL701-31SC-R Datasheet(PDF) 3 Page - PhaseLink Corporation |
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PLL701-31SC-R Datasheet(HTML) 3 Page - PhaseLink Corporation |
3 / 5 page PLL701-31 Low EMI Spread Spectrum Multiplier Clock 47745 Fremont Blvd., Fremont, California 94538 Tel (510) 492-0990 Fax (510) 492-0991 www.phaselink.com Rev 11/28/05 Page 3 FUNCTIONAL DESCRIPTION Selectable spread spectrum modulation types and magnitudes The PLL701-31 provides selectable spread spectrum modulation type, as well as selectable modulation magnitude. Selection is made by connecting specific pins to a logical “zero” or “one”, according to the output clock selection table on page 1. In order to reduce the number of pins on the chip, the PLL701-31 uses pin 2 (XOUT/SD) as a bi-directional pin. The pin serves as a modulation type and magnitude selector input (SD) upon power-up (see output clock selection table on page 1), and as XOUT crystal connection as soon as the input has been latched. Pins 3 (SC0), 4 (SC1), and 7 (SC2) are used as inputs to complete the spread spectrum modulation type and magnitude selection as shown on the output clock selection table (page 1). Connecting a selection pin to a logical “one” All selection pins have an internal pull-up resistor (30k Ω for pins 3, 4, 7, and 120kΩ for pin 2). This internal pull- up resistor will pull the input value to a logical “one” by default, i.e. when no connection is made between the pin and GND. No external pull-up resistor is therefore required for connecting a logical “one” upon power-up. Connecting a selection pin to a logical “zero” For an input only pin, i.e. pins 3 (SC0), 4 (SC1), and 7 (SC2), the pin simply needs to be grounded to pull the input down to a logical “zero”. Pin 2 (XOUT/SD) should be connected to GND thru a 27k Ω resistor to select a logical “zero”. ELECTRICAL SPECIFICATIONS 1. Absolute Maximum Ratings PARAMETERS SYMBOL MIN. MAX. UNITS Supply Voltage VDD 4.6 V Input Voltage, dc VI -0.5 VDD+0.5 V Output Voltage, dc VO -0.5 VDD+0.5 V Storage Temperature TS -65 150 °C Ambient Operating Temperature* TA -40 85 °C Junction Temperature TJ 125 °C Lead Temperature (soldering, 10s) 260 °C ESD Protection, Human Body Model 2 kV Exposure of the device under conditions beyond the limits specified by Maximum Ratings for extended periods may cause permanent damage to the device and affect product reliability. These conditions represent a stress rating only, and functional operations of the device at these or any other conditions above the operational limits noted in this specification is not implied. * Note: Operating Temperature is guaranteed by design for all parts (COMMERCIAL and INDUSTRIAL), but tested for COMMERCIAL grade only. |
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