±60V, fault-protected, dual 4:1 multiplexers with fault threshold, latch-up immunity and 1.8-V logic

The TMUX7348F and TMUX7349F are modern complementary metal-oxide semiconductor (CMOS)

analog multiplexers in 8:1 (single ended) and 4:1 (differential) configurations. The devices

work well with dual supplies (±5 V to ±22 V), a single supply (8 V to 44 V), or asymmetric

supplies (such as V DD = 12 V, V SS = –5 V). The overvoltage protection

is available in powered and powered-off conditions, making the TMUX7348F and TMUX7349F

devices suitable for applications where power supply sequencing cannot be precisely

controlled.

The device blocks fault voltages up to +60 V and –60 V relative to ground in both powered

and powered-off conditions. When no power supplies are present, the switch channels remain

in the OFF state regardless of switch input conditions and logic control status. Under

normal operation conditions, if the analog input signal level on any Sx pin exceeds positive

fault supply (V FP) or negative fault supply (V FN) by a threshold

voltage (V T), then the channel turns OFF and the Sx pin becomes high impedance.

When the fault channel is selected, the drain pin (D or Dx) is pulled to the fault supply

voltage (V FP or V FN) that was exceeded. The devices provide two

active-low interrupt flags (FF and SF) to provide details of the fault. The FF flag

indicates if any of the source inputs are experiencing a fault condition, while the SF flag

is used to decode which specific inputs are experiencing a fault condition.

The low capacitance, low charge injection, and integrated fault protection enables the

TMUX7348F and TMUX7349F devices to be used in front end data acquisition applications where

high performance and high robustness are both critical. The devices are available in

standard TSSOP package and smaller WQFN package (ideal if PCB space is limited).