1 Features
• Section 8.3.6
• 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. 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.