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ICS8536-02 Datasheet(PDF) 10 Page - Integrated Device Technology |
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ICS8536-02 Datasheet(HTML) 10 Page - Integrated Device Technology |
10 / 17 page ICS8536AG-02 REVISION A JULY 21, 2010 10 ©2010 Integrated Device Technology, Inc. ICS8536-02 Data Sheet 1-TO-6, DUALCRYSTAL/LVCMOS-TO-3.3V, 2.5V LVPECL FANOUT BUFFER Crystal Input Interface The ICS8536-02 has been characterized with 18pF parallel resonant crystals. The capacitor values shown in Figure 2 below were determined using an 18pF parallel resonant crystal and were chosen to minimize the ppm error. Figure 2. Crystal Input Interface Overdriving the XTAL Interface The XTAL_IN input can accept a single-ended LVCMOS signal through an AC coupling capacitor. A general interface diagram is shown in Figure 3A. The XTAL_OUT pin can be left floating. The maximum amplitude of the input signal should not exceed 2V and the input edge rate can be as slow as 10ns. This configuration requires that the output impedance of the driver (Ro) plus the series resistance (Rs) equals the transmission line impedance. In addition, matched termination at the crystal input will attenuate the signal in half. This can be done in one of two ways. First, R1 and R2 in parallel should equal the transmission line impedance. For most 50 Ω applications, R1 and R2 can be 100 Ω. This can also be accomplished by removing R1 and making R2 50 Ω. By overdriving the crystal oscillator, the device will be functional, but note, the device performance is guaranteed by using a quartz crystal. Figure 3A. General Diagram for LVCMOS Driver to XTAL Input Interface Figure 3B. General Diagram for LVPECL Driver to XTAL Input Interface XTAL_IN XTAL_OUT X1 18pF Parallel Crystal C1 33pF C2 27pF R2 100 R1 100 RS 43 Ro ~ 7 Ohm Driv er_LVCMOS Zo = 50 Ohm C1 0.1uF 3.3V 3.3V Cry stal Input Interf ace XTAL_IN XTAL_OUT Cry stal Input Interf ace XTAL_IN XTAL_OUT R3 50 C1 0.1uF R2 50 R1 50 Zo = 50 Ohm LVPECL Zo = 50 Ohm VCC=3.3V |
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