Analog Devices Inc./Maxim Integrated MAX350EWN+

Overview

The MAX350EWN+ from Maxim Integrated is a dual 4-channel serially controlled analog multiplexer designed for bidirectional rail-to-rail signal routing in industrial and test equipment. It features eight independently controllable SPST switches, ±2.7V to ±8V dual-supply operation (or +2.7V to +16V single supply), 100Ω max on-resistance at ±5V, <16Ω channel-to-channel on-resistance match, and 0.1nA max NO off-leakage at +25°C. It serves as the core analog switching element in programmable signal path selection for ATE and avionics systems.

For engineers reviewing the MAX350EWN+ datasheet, MAX350EWN+ pinout, MAX350EWN+ application, or MAX350EWN+ equivalent, key selection criteria include its daisy-chainable SPI/QSPI/MICROWIRE interface, -40°C to +85°C extended temperature rating, 18-pin wide SO package, dual 4-to-1 mux topology, and guaranteed rail-to-rail analog signal handling with <10Ω on-resistance flatness over ±3V range.

Technical Context

The MAX350EWN+ implements an 8-bit shift register architecture synchronized to SCLK's rising edge, with CS-controlled latching on its rising edge-fully compliant with SPI Mode 0 (CPOL=0, CPHA=0). Its internal logic decodes serial data (D7 first) to drive two independent 4-channel switch arrays: COMA/NO0A–NO3A and COMB/NO0B–NO3B.

Each switch exhibits symmetrical bidirectional conduction, with on-resistance flatness specified over VCOM = ±3V at ±5V supplies and leakage performance validated across -40°C to +85°C. The asynchronous RESET input forces all switches open and clears the shift register, enabling deterministic power-up behavior without external initialization sequencing.

Key Specifications

Pinout & Package

MAX350EWN+ is housed in an 18-pin wide SO (SOIC-W) package with 0.3" body width and standard 1.27mm pitch. Pin 1 is marked by a beveled corner; pins are numbered counterclockwise.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog multiplexer applications.

Compared with ADG732BRUZ and TMUX1308PWR, the MAX350EWN+ uniquely combines dual-supply flexibility, SPI daisy-chaining, and guaranteed rail-to-rail operation across -40°C to +85°C - making it optimal for ATE and avionics where signal integrity, supply versatility, and deterministic multi-device control are critical.

Availability

MAX350EWN+ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and avionics signal management requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX350EWN+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.

The MAX350 belongs to Maxim's serially controlled analog switch/multiplexer product line, engineered specifically for programmable, low-leakage, rail-to-rail signal routing in test and measurement, process control, and safety-critical systems.

FAQ

What is the maximum allowable analog signal voltage range for MAX350EWN+ when operated with ±5V supplies?

The MAX350EWN+ supports analog signals from (V− − 2V) to (V+ + 2V). With ±5V supplies, this translates to -7V to +7V. This rail-to-rail capability ensures full utilization of sensor and amplifier output ranges without clipping, and is explicitly guaranteed across the -40°C to +85°C operating temperature range for the MAX350EWN+ variant.

Does MAX350EWN+ support daisy-chaining with other MAX350EWN+ devices, and what is required to implement it?

Yes, MAX350EWN+ supports daisy-chaining via its DOUT pin. To implement: connect CS pins in parallel, route DOUT of one device to DIN of the next, and shift 8 × N bits (where N = number of devices) while holding CS low. On the rising edge of CS, all devices simultaneously update their switch states. The MAX350EWN+ DOUT logic-high level equals V+, so ensure V+ matches downstream logic levels or add level translation if interfacing with 3.3V controllers.

What is the guaranteed on-resistance match between channels for MAX350EWN+, and why does it matter in precision applications?

The MAX350EWN+ guarantees ≤16Ω on-resistance match (∆RON = RON(max) − RON(min)) between any two channels at TA = +25°C with ±5V supplies. This tight matching ensures consistent gain and offset across channels in ratiometric measurements (e.g., bridge sensor readouts), minimizes channel-dependent nonlinearity in multiplexed ADC systems, and reduces calibration burden in high-accuracy data acquisition architectures.

How does the RESET pin function on MAX350EWN+, and is it necessary to use it in every design?

The RESET pin on MAX350EWN+ is an asynchronous active-low input that forces all eight switches open and resets the internal 8-bit shift register to zero. While not mandatory for basic operation (power-up defaults to all switches open), it is essential for deterministic recovery after fault conditions, system reset sequences, or when predictable initial state is required without relying on power-rail monotonicity. Its use is strongly recommended in safety-critical and ATE applications.

Can MAX350EWN+ operate from a single +12V supply, and what are the implications for analog signal range and on-resistance?

Yes, MAX350EWN+ supports single-supply operation from +2.7V to +16V. At +12V, the analog signal range extends from 0V to +12V (rail-to-rail), and typical on-resistance is ~150Ω (vs. 100Ω at ±5V). This configuration eliminates negative supply generation but increases on-resistance - acceptable for moderate-impedance signal sources (<10kΩ) where voltage drop remains below 1mV at 10µA signal current.