1 Features
• Wide supply range:
– Dual supply: ±5 V to ±22 V
– Single supply: 8 V to 44 V
• Integrated fault protection:
– Overvoltage protection, source to supplies or
source to drain: ±85 V
– Overvoltage protection: ±60 V
– Power-off protection: ±60 V
– Adjustable overvoltage triggering thresholds
• VFP: 3 V to VDD, VFN: 0 V to VSS
– Interrupt flags to indicate overall and specific
fault channel information
– Non-fault channels continue to operate with low
leakage currents
– Output clamped to the fault supply in
overvoltage condition
• Latch-up immunity by device construction
• Logic capable: 1.8-V
• Fail-safe logic: up to 44 V independent of supply
• Break-before-make switching
• Industry-standard TSSOP and smaller WQFN
package

2 Applications
• Factory automation and control
• Programmable logic controllers (PLC)
• Analog input modules
• Semiconductor test equipment
• Battery test equipment
• Servo drive control module
• Data acquisition systems (DAQ)

3 Description
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 VDD = 12
V, VSS = –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 (VFP) or negative fault supply (VFN) by a
threshold voltage (VT), 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 (VFP or VFN) 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).