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ICS840004AG-01LFT Datasheet(PDF) 10 Page - Integrated Circuit Systems |
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ICS840004AG-01LFT Datasheet(HTML) 10 Page - Integrated Circuit Systems |
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10 / 13 page  Integrated Circuit Systems, Inc. 8400042AG-01 www.icst.com/products/hiperclocks.html REV. B JANUARY 3, 2006 10 ICS840004-01 FEMTOCLOCKS™CRYSTAL-TO- LVCMOS/LVTTL FREQUENCY SYNTHESIZER PRELIMINARY 3.3V R3 36 RU1 1K Zo = 50 Ohm C3 10uF RD1 Not Install Logic Control Input Examples R4 36 R2 10 C6 0.1u C4 0.01u To Logic Input pins XTAL_IN RD2 1K VDDA Set Logic Input to '1' LVCMOS RU2 Not Install 3.3V 3.3V C5 0.1u C2 22pF Set Logic Input to '0' 3.3V Zo = 50 Ohm LVCMOS 3.3V To Logic Input pins U1 ICS840004-01 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 20 19 18 17 F_SEL0 nc nXTAL_SEL TEST_CLK OE MR nPLL_SEL VDDA nc VDD XTAL_OUT XTAL_IN GND Q3 Q2 VDDO F_SEL1 GND Q0 Q1 XTAL_OUT X1 C1 22pF LAYOUT GUIDELINE Figure 3 shows a schematic example of the ICS840004-01. An example of LVCMOS termination is shown in this schematic. Additional LVCMOS termination approaches are shown in the LVCMOS Termination Application Note. In this example, an 18pF parallel resonant 25MHz crystal is used. The C1=22pF and FIGURE 3. ICS840004-01 SCHEMATIC EXAMPLE C2=22pF are recommended for frequency accuracy. For dif- ferent board layout, the C1 and C2 may be slightly adjusted for optimizing frequency accuracy. 1K Ω pullup or pulldown resistors can be used for the logic control input pins. INPUTS: CRYSTAL INPUT: For applications not requiring the use of the crystal oscillator input, both XTAL_IN and XTAL_OUT can be left floating. Though not required, but for additional protection, a 1k Ω resistor can be tied from XTAL_IN to ground. TEST_CLK INPUT: For applications not requiring the use of the test clock, it can be left floating. Though not required, but for additional protection, a 1k Ω resistor can be tied from the TEST_CLK to ground. LVCMOS CONTROL PINS: All control pins have internal pull-ups or pull-downs; additional resistance is not required but can be added for additional protection. A 1k Ω resistor can be used. RECOMMENDATIONS FOR UNUSED INPUT AND OUTPUT PINS OUTPUTS: LVCMOS OUTPUT: All unused LVCMOS output can be left floating. We recommend that there is no trace attached. |
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