ZHCSIX6B October 2018 – Sept 2019 TMUX1574
The TMUX1574 can be operated without any external components except for the supply decoupling capacitors. The TMUX1574 has internal weak pull-down resistors (6 MΩ) to GND so that it powers-on with the switches in a known state. All inputs signals passing through the switch must fall within the recommend operating conditions of the TMUX1574 including signal range and continuous current. For this design example, with a supply of 3.3 V, the signals can range from 0 V to 3.3 V when the device is powered. This example can also utilize the feature and the inputs can range from 0 V to 3.6 V when VDD = 0 V. The max continuous current can be 25 mA. Due to the voltage range and high speed capability, the TMUX1574 example is suitable for use in SPI, JTAG, and I2S applications. Refer to Enabling SPI-based flash memory expansion by using multiplexers for more information on using switches and multiplexers for SPI protocol expansion.