Introduction, characteristics, and applications of Texas Instruments TMUX722x 1:1 (SPST) 2-channel precision switch

Texas Instruments TMUX722x 1:1 (SPST) 2-channel precision switches are latch-immune complementary metal-oxide semiconductor (CMOS) switches in a dual-channel 1:1 (SPST) configuration. These devices operate with single supplies (4.5V to 44V), dual supplies (±4.5V to ±22V), or asymmetric supplies (such as V(DD) = 12V, V(SS) = -5V). The TMUX722x supports bidirectional analog and digital signals from V(SS) to V(DD) on the source (Sx) and drain (D) pins.

The TMUX722x can enable or disable signal path 1 (S1 to D1) or signal path 2 (S2 to D2) by controlling the SEL pin. All logic control inputs support logic levels from 1.8V to V(DD), allowing TTL and CMOS logic compatibility when operating within the valid supply voltage range. Fail-safe logic circuitry allows the voltage on the control pin to be applied before the power pin, protecting the device from potential damage.

The Texas Instruments TMUX72xx family provides latch immunity to prevent undesirable high current events between parasitic structures within the device that are often caused by overvoltage events. The latched state typically persists until the power rails are turned off and can cause device failure. The latch immunity feature allows the TMUX72xx family of switches and multiplexers to be used in harsh environments.

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Functional block diagram