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).