General Description
The MAX4638/MAX4639 are single 8:1 and dual 4:1 CMOS analog multiplexers/demultiplexers (muxes/demuxes). Each mux operates from a single +1.8V to +5V supply or dual ±2.5V supplies. These devices feature 3.5Ω on-resistance (RON) when powered with a single +5V supply and have -75dB off-isolation and -85dB crosstalk from the output to each off channel. The switching times are 18ns tON and 7ns tOFF. They feature a -3dB 85MHz bandwidth and a guaranteed 0.25nA leakage current at +25°C.
A +1.8V to +5.5V operating range makes the MAX4638/MAX4639 ideal for battery-powered, portable instruments. All channels guarantee break-before-make switching. These parts feature bidirectional operation and can handle Rail-to-Rail® analog signals. All control inputs are TTL/CMOS-logic compatible. Decoding is in standard BCD format, and an enable input is provided to simplify cascading of devices. These devices are available in small 16-pin TQFN, TSSOP, and SO packages, as well as a 20-pin TQFN package.

Features
♦ Guaranteed RON
   3.5Ω (+5V or ±2.5V Supplies)
   6Ω (+3V Supply)
♦ Guaranteed 0.4Ω RON Match Between Channels
♦ Guaranteed 1Ω RON Flatness Over Signal Range
♦ Guaranteed Low Leakage Currents
   0.25nA at +25°C
♦ Switching Times: tON = 18ns, tOFF = 7ns
♦ +1.8V to +5.5V Single-Supply Operation
   ±2.5V Dual-Supply Operation
♦ Rail-to-Rail Signal Handling
♦ TTL/CMOS-Logic Compatible
♦ Crosstalk: -80dB (1MHz)
♦ Off-Isolation: -60dB (10MHz)

Applications
   Automatic Test Equipment
   Low-Voltage Data-Acquisition Systems
   Audio and Video Signal Routing
   Medical Equipment
   Battery-Powered Equipment
   Relay Replacement