EL4584 View Datasheet(PDF) - Intersil
Part Name
Description
Manufacturer
EL4584 Datasheet PDF : 12 Pages
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EL4584
Pin Descriptions
PIN NUMBER
PIN NAME
FUNCTION
1, 2, 16
3
4
5
6
7
PROG A,B,C Digital inputs to select ÷ N value for internal counter. See table below for values.
OSC/VCO OUT Output of internal inverter/oscillator. Connect to external crystal or LC tank VCO circuit.
VDD (A)
Analog positive supply for oscillator, PLL circuits.
OSC/VCO IN Input from external VCO.
VSS (A)
Analog ground for oscillator, PLL circuits.
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 DET Lock Detect output. Low level when PLL is locked. Pulses high when out of lock.
13
EXT DIV
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.
PROG A (PIN 16)
0
0
0
0
1
1
1
1
TABLE 1. VCO DIVISORS
PROG B (PIN 1)
PROG C (PIN 2)
0
0
0
1
1
0
1
1
0
0
0
1
1
0
1
1
DIV VALUE (N)
851
864
944
1135
682
858
780
910
4
FN7174.2
July 25, 2005
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