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EL4584CS Datasheet(PDF) 4 Page - Intersil Corporation |
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EL4584CS Datasheet(HTML) 4 Page - Intersil Corporation |
4 / 15 page 4 FN7174.3 May 9, 2008 Pin Descriptions PIN NUMBER PIN NAME FUNCTION 1, 2, 16 PROG B, PROG C, PROG A Digital inputs to select ÷ N value for internal counter. See Table 2 for values. 3 OSC/VCO OUT Output of internal inverter/oscillator. Connect to external crystal or LC tank VCO circuit. 4 VDD (A) Analog positive supply for oscillator, PLL circuits. 5 OSC/VCO IN Input from external VCO. 6 VSS (A) Analog ground for oscillator, PLL circuits. 7 CHARGE PUMP OUT Connect to loop filter. If the HSYNC phase is leading or HSYNC frequency > CLK ÷ N, current is pumped into the filter capacitor to increase VCO frequency. If HSYNC phase is lagging or frequency < CLK ÷ N, current is pumped out of the filter capacitor to decrease VCO frequency. During coast mode or when locked, charge pump goes to a high impedance state. 8 DIV SELECT Divide select input. When high, the internal divider is enabled and EXT DIV becomes a test pin, outputting CLK ÷ N. When low, the internal divider is disabled and EXT DIV is an input from an external ÷ N. 9 COAST Tri-state logic input. Low (<1/3*VCC) = normal mode, Hi Z (or 1/3 to 2/3*VCC) = fast lock mode, High (>2/3*VCC) = coast mode. 10 HSYNC IN Horizontal sync pulse (CMOS level) input. 11 VDD (D) Positive supply for digital, I/O circuits. 12 LOCK DETECT Lock Detect output. Low level when PLL is locked. Pulses high when out of lock. 13 EXT DIVIDER External Divide input when DIV SEL is low, internal ÷N output when DIV SEL is high. 14 VSS (D) Ground for digital, I/O circuits. 15 CLK OUT Buffered output of the VCO. TABLE 2. VCO DIVISORS PROG A (PIN 16) PROG B (PIN 1) PROG C (PIN 2) DIV VALUE (N) 000 851 001 864 010 944 011 1135 100 682 101 858 110 780 111 910 EL4584 |
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