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I have two analog multiplexers on the same net (WORK_ELEC): TMUX1108 (8:1) TMUX1104 (4:1) For 4:1 MUX Enabled is going through an Inverter . They must be mutually exclusive (never enabled at th...
#1: Initial revision
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newbie
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2026-01-05T14:27:39Z (9 months ago)
Mutually exclusive enable for TMUX1108 (8:1) and TMUX1104 (4:1) using SN74LVC1G240 — safe POR and logic review
I have two analog multiplexers on the same net (WORK_ELEC): [TMUX1108 (8:1)](https://www.ti.com/lit/ds/symlink/tmux1108.pdf?ts=1767622130908&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTMUX1108%253Futm_source%253Dgoogle%2526utm_medium%253Dcpc%2526utm_campaign%253Dasc-int-null-44700045788355296_prodfolderdynamic-cpc-pf-google-eu_en_int%2526utm_content%253Dprodfolddynamic%2526ds_k%253DDYNAMIC+SEARCH+ADS%2526DCM%253Dyes%2526gclsrc%253Daw.ds%2526gad_source%253D1%2526gad_campaignid%253D11373390683%2526gbraid%253D0AAAAAC068F2zJefI9XAMWKFLt652Q3qen%2526gclid%253DEAIaIQobChMI09yb_ML0kQMVM6SDBx01VgxTEAAYASAAEgLAM_D_BwE) [TMUX1104 (4:1)](https://www.ti.com/lit/ds/symlink/tmux1104.pdf?ts=1767556827906&ref_url=https%253A%252F%252Fwww.mouser.de%252F) For 4:1 MUX Enabled is going through an [Inverter ](https://www.ti.com/lit/ds/symlink/sn74lvc1g240.pdf?ts=1767623219431&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FSN74LVC1G240). They must be mutually exclusive (never enabled at the same time). Additionally, I want both MUXes disabled at power‑on (POR). **Control Signal:** A single digital control: WE_MUX_EN (from AD5941). Desired behavior: WE_MUX_EN = High → Enable 8:1, Disable 4:1 WE_MUX_EN = Low → Disable 8:1, Enable 4:1 At POR (before firmware drives WE_MUX_EN): both disabled. My schematic is given below. May I know my logic is correct or not. 