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Si53321-B-GQ Scheda tecnica(PDF) 7 Page - Silicon Laboratories |
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Si53321-B-GQ Scheda tecnica(HTML) 7 Page - Silicon Laboratories |
7 / 51 page 2.3 Input Bias Resistors Internal bias resistors ensure a differential output low condition in the event that the clock inputs are not connected. The non-inverting input is biased with a 18.75 kΩ pull-down to GND and a 75 kΩ pull-up to VDD. The inverting input is biased with a 75 kΩ pull-up to VDD. RPU CLK0 or CLK1 RPU RPU = 75 k RPD = 18.75 k RPD + – VDD Figure 2.5. Input Bias Resistors Note: To minimize the possibility of system noise coupling into the Si5332x differential inputs and adversely affecting the buffered out- put, Silicon Labs recommends 1 PPS clocks and disabled/gapped clocks be dc-coupled and driven “stop-low”. 2.4 Input Mux The Si53320/21/23/26/27/28 provide two clock inputs for applications that need to select between one of two clock sources. The CLK_SEL pin selects the active clock input. The following table summarizes the input and output clock based on the input mux and output enable pin settings. Table 2.3. Input Mux Logic CLK_SEL CLK0 CLK1 Q1 Qb L L X L H L H X H L H X L L H H X H H L Note: 1. On the next negative transition of CLK0 or CLK1. Si53320-28 Data Sheet Functional Description silabs.com | Smart. Connected. Energy-friendly. Rev. 1.2 | 6 |
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