1 Features

• Injection current control

• Back-powering protection

– No ESD diode path to VDD

• Wide supply range: 1.62V to 5.5V

• Low ON-capacitance

• Bidirectional signal path

• Optimized for high-impedance loads

• Rail-to-rail operation

• 1.8V logic compatible

• Fail-safe logic

• Break-before-make switching

• Short-to-battery protection for ON and OFF

channels

• Functional safety-capable

– Documentation available to aid functional safety

system design

• TMUX1308A – pin compatible with:

– Industry standard 4051, 4851 and 1308

multiplexers

• TMUX1309A – pin compatible with:

– Industry standard 4052, 4852 and 1309

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 TMUX1308A and TMUX1309A are general

purpose complementary metal-oxide semiconductor

(CMOS) multiplexers (MUX). The TMUX1308A is

an 8:1, 1-channel (single-ended) mux, while the

TMUX1309A 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 TMUX13xxA 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 or enabled

signal paths to exceed the supply voltage. Disabled

channels with voltages above VDD are prevented

from affecting the signal of the enabled signal path.

Additionally, the TMUX13xxA 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 1.8V logic compatible thresholds,

allowing for 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.