Analog Devices Inc./Maxim Integrated MAX350EAP+T

Overview

MAX350EAP+T from Maxim Integrated is a dual 4-channel serially controlled analog multiplexer with bidirectional signal routing, 100Ω max on-resistance (±5V supplies), ±2.7V to ±8V dual or +2.7V to +16V single supply operation, and rail-to-rail analog signal handling up to ±5.5V. It serves as a digitally programmable switch matrix in precision data-acquisition front-ends.

For engineers reviewing the MAX350EAP+T datasheet, MAX350EAP+T pinout, MAX350EAP+T application, or MAX350EAP+T equivalent, key selection criteria include its daisy-chainable SPI/QSPI/MICROWIRE interface, -40°C to +85°C industrial temperature range, 0.1nA typical NO off-leakage at +25°C, break-before-make timing, and dual independent 4-to-1 mux architecture.

Technical Context

The MAX350EAP+T implements two independent 4-to-1 analog multiplexers (COMA/NO0A–NO3A and COMB/NO0B–NO3B), each controlled by four dedicated bits of an 8-bit shift register. Switch configuration updates synchronously on the rising edge of CS, independent of SCLK state, satisfying SPI Mode 0 (CPOL=0, CPHA=0) requirements.

Its analog path supports bidirectional rail-to-rail signals across the full supply range; on-resistance matching is ≤16Ω between channels and flatness is ≤10Ω over ±3V input range (V± = ±5V). Digital inputs tolerate TTL/CMOS thresholds (0.8V/2.4V) with ±5V or +5V supplies, and DOUT provides V+-referenced logic output for daisy-chaining.

Key Specifications

Pinout & Package

MAX350EAP+T is housed in a 20-pin SSOP package (body width 0.209", 5.30mm) with exposed pad for thermal enhancement. Pin 14 is N.C. (not internally connected); all analog pins (COMA, COMB, NO0A–NO3A, NO0B–NO3B) are electrically identical and bidirectional.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG732BRUZ and TMUX1308PWR, MAX350EAP+T uniquely supports true bipolar analog operation (±8V), includes asynchronous RESET, and enables scalable daisy-chained configurations - making it optimal for industrial and avionics systems requiring robust, flexible, and temperature-stable analog switching.

Availability

MAX350EAP+T is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, avionics sensor interfaces, and professional audio routing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX350EAP+T 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 for high-accuracy, low-leakage, and noise-immune signal routing in data-acquisition and test systems.

FAQ

What is the maximum analog signal range supported by the MAX350EAP+T?

The MAX350EAP+T supports rail-to-rail analog signals from V− to V+. With ±5V dual supplies, this delivers a full ±5.5V range (V− = −5.5V, V+ = +5.5V). In single-supply mode (+12V), it handles 0V to +12V signals. The device maintains specified on-resistance flatness and leakage performance across these ranges, as confirmed in the Electrical Characteristics tables for dual and single supply conditions.

Does the MAX350EAP+T support daisy-chaining, and how is it implemented?

Yes, the MAX350EAP+T supports daisy-chaining via its DOUT pin, which outputs the shifted-in data delayed by eight clock cycles. To daisy-chain, connect DOUT of one device to DIN of the next, tie all CS and SCLK lines together, and shift a continuous stream of bits - the first 8 bits configure the last device, the next 8 bits configure the prior device, and so on. This is explicitly documented in the "Daisy-Chaining" section of the MAX349/MAX350 datasheet.

What is the function of the RESET pin on the MAX350EAP+T, and is it necessary to use it?

The RESET pin on the MAX350EAP+T is an asynchronous active-low input that forces all eight switches OFF and resets the internal 8-bit shift register to zero. While not mandatory for basic operation, it is essential for deterministic startup, fault recovery, or synchronization across multiple daisy-chained devices. Its behavior is guaranteed across the full −40°C to +85°C range and does not require clocking or CS assertion.

Can the MAX350EAP+T operate with a single +3.3V supply, and what are the trade-offs?

Yes, the MAX350EAP+T operates with a single +3.3V supply (within the +2.7V to +16V spec). At +3.3V, on-resistance increases to ~500Ω (typ), and turn-on time extends to ~700ns (max), as shown in the Single +3V Supply Electrical Characteristics table. Signal range is limited to 0V to +3.3V, and logic thresholds remain compatible (0.8V/2.4V), but rail-to-rail analog operation is constrained to this unipolar window.

How does the MAX350EAP+T ensure channel isolation during switching transitions?

The MAX350EAP+T guarantees break-before-make (BBM) timing with a minimum delay of 1ns and typical 5ns between turn-off of the old channel and turn-on of the new channel. This prevents momentary shorts between analog sources - a requirement explicitly verified in the Switch Dynamic Characteristics table and confirmed in Figure 1 timing diagrams. BBM behavior is inherent to the internal latch architecture and independent of SCLK or CS timing margins.