Description:The QS3253 is a high-speed CMOS TTL-compatible dual 4:1 multiplexer/ demultiplexer with 3-state outputs. The QS3253 is function and pinout compatible version of the 74F253, 74FCT253, and the 74ALS/AS/ LS253 dual 4:1 multiplexers. The low ON resistance of the QS3253 allows inputs to be connected to outputs without adding propagation delay and without generating additional ground bounce noise. The QS3253 operates at -40C to +85C.
Renesas provides a recommended PCB layout guide in their application note (APN) documents, which can be found on their website. The guide includes layout considerations for power supply, ground, and signal traces to minimize noise and ensure reliable operation.
The QS3253S1G has a thermal pad on the bottom of the package, which should be connected to a thermal ground plane on the PCB. Additionally, Renesas recommends using thermal vias to dissipate heat away from the device. A thermal analysis should be performed to ensure the device operates within its specified temperature range.
The input capacitor (CIN) should be a low-ESR ceramic capacitor with a value between 1uF to 10uF, and the output capacitor (COUT) should be a low-ESR ceramic capacitor with a value between 1uF to 22uF. The capacitor selection should be based on the specific application requirements and operating conditions.
Renesas provides EMC guidelines in their application notes, which include recommendations for PCB layout, component selection, and shielding. Additionally, the device should be used in conjunction with proper filtering and shielding to minimize electromagnetic interference (EMI).
The enable pin (EN) should be driven by a logic signal with a voltage level compatible with the device's input voltage range. The power-good pin (PGOOD) is an open-drain output that requires a pull-up resistor to a voltage level compatible with the device's input voltage range.
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QS3253S1G Overview
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