1 Features
• Injection current control
• Back-powering protection
– No ESD diode path to VDD
• Wide supply range: 1.62 V to 5.5 V
• Low capacitance
• Bidirectional signal path
• Rail-to-rail operation
• 1.8 V logic compatible
• Fail-safe logic
• Break-before-make switching
• Functional Safety-Capable
– Documentation Available to Aid Functional
Safety System Design
• TMUX1308 – pin compatible with:
– Industry standard 4051 and 4851 multiplexers
• TMUX1309 – pin compatible with:
– Industry standard 4052 and 4852 multiplexers

2 Applications
• Analog and digital multiplexing and demultiplexing
• Diagnostics and monitoring
• Data center switch
• Remote radio unit (RRU)
• Rack server
• Electricity meter
• Appliances
• Air conditioner units
• Multifunction printers
• String inverter
• IP network camera
• Currency counters
• Off-highway vehicles control systems

3 Description
The TMUX1308 and TMUX1309 are general purpose
complementary metal-oxide semiconductor (CMOS)
multiplexers (MUX). The TMUX1308 is an 8:1,
1-channel (single-ended) mux, while the TMUX1309
is a 4:1, 2-channel (differential) mux. The devices
support bidirectional analog and digital signals on the
source (Sx) and drain (Dx) pins ranging from GND to
VDD.
The TMUX13xx devices have an internal injection
current control feature which eliminates the need for
external diode and resistor networks typically used to
protect the switch and keep the input signals within
the supply voltage. The internal injection current
control circuitry allows signals on disabled signal
paths to exceed the supply voltage without affecting
the signal of the enabled signal path. Additionally,
the TMUX13xx devices do not have an internal diode
path to the supply pin, which eliminates the risk of
damaging components connected to the supply pin or
providing unintended power to the supply rail.
All logic inputs have 1.8 V logic compatible
thresholds, ensuring both TTL and CMOS logic
compatibility when operating with a valid supply
voltage. Fail-Safe Logic circuitry allows voltages on
the control pins to be applied before the supply pin,
protecting the device from potential damage.