1 Features
• Supply range: 1.8 V to 5.5 V
• Beyond the supply signal range: -5.5 V to 5.5 V
• High current support: >1A (maximum)
• Ultra-low on-resistance: 0.2 Ω
• Low on-resistance flatness: 1 mΩ
• Low THD+N: 0.001% (-100 dB)
• –40°C to +125°C operating temperature
• Powered off protection
• Over temperature protection
• 1.8 V logic compatible
• Fail-safe logic
• Break-before-make switching

2 Applications
• Land mobile radios
• Defense radios
• Ultrasonic gas flow transmitters
• Smart drug delivery
• Analog input modules
• Industrial module detection
• RS485/232

3 Description
The TMUX2889 is a complementary metal-oxide
semiconductor (CMOS) multiplexer with two
independently selectable 2:1, single-pole, doublethrow
(SPDT) switch channels. This device works
with a single supply (1.6 V to 5.5 V), but can pass
bidirectional analog and digital signals beyond the
supply from -5.5 V to 5.5 V.
The TMUX2889 also features powered off protection
up to ±5.5 V, which isolates the switch even when
there is no supply voltage present (VDD = 0 V).
Without this protection feature, any voltage on the
switch can back-power the supply rail through an
internal ESD diode and cause potential damage to the
rest of the system.
With 0.001% THD+N and 1 mΩ RON-flatness, the
TMUX2889 is designed for passing precision analog
and audio signals without adding distortion.