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.