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
– Powered-off protection: ±60 V
– Non-fault channels continue to operate
– Known state without logic inputs present
– Output clamped to the supply in overvoltage
condition
• Latch-up immune
• 1.8-V Logic capable
• Fail-safe logic: up to 44 V independent of supply
• Integrated pull-down resistor on logic pins
• Break-before-make switching
• Industry standard TSSOP and
smaller WQFN packages

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 TMUX7308F and TMUX7309F 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
TMUX7308F and TMUX7309F devices suitable for
applications where power supply sequencing cannot
be precisely controlled.
The device blocks fault voltage up to +60 V or –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 the supply voltage (VDD
or VSS) by a threshold voltage (VT), 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 supply (VDD or VSS) that was exceeded.
The low capacitance, low charge injection, and
integrated fault protection enables the TMUX7308F
and TMUX7309F devices to be used in front end
data acquisition applications where high performance
and high robustness are both critical. The devices are
available in a standard TSSOP package and smaller
WQFN package (ideal if PCB space is limited).