Analog Devices Inc./Maxim Integrated MAX350EPN

Overview

The MAX350EPN from Maxim Integrated is a dual 4-channel serially controlled analog multiplexer, implementing two independent 4-to-1 muxes (COMA/NO0A–NO3A and COMB/NO0B–NO3B) with bidirectional rail-to-rail signal handling, 100Ω max on-resistance at ±5V supplies, <16Ω channel-to-channel R_ON match, and 0.1nA NO off-leakage at +25°C - used in precision data-acquisition front-ends and industrial control I/O modules.

For engineers reviewing the MAX350EPN datasheet, MAX350EPN pinout, MAX350EPN application, or MAX350EPN equivalent, this page delivers verified electrical specs, SPI/QSPI-compatible timing, daisy-chain capability, -40°C to +85°C extended temperature operation, and real-world design context for analog signal routing in ATE and avionics systems.

Technical Context

The MAX350EPN operates as two independent 4-to-1 analog multiplexers, each with its own common terminal (COMA/COMB) and four normally-open inputs (NO0A–NO3A / NO0B–NO3B), controlled via an 8-bit shift register updated on the rising edge of CS. Its bidirectional switches support rail-to-rail analog signals from V− to V+, with flat on-resistance (<15Ω variation over ±3V range) and guaranteed break-before-make timing (1–10ns).

Serial interface compliance includes SPI™/QSPI™ (CPOL = 0) and MICROWIRE™ protocols; DOUT enables daisy-chaining multiple devices with synchronous update on CS high. Logic thresholds (0.8V/2.4V) ensure TTL/CMOS compatibility across ±5V dual or +5V single supply configurations.

Key Specifications

Pinout & Package

MAX350EPN is housed in an 18-pin plastic DIP package (0.3-inch width), rated for -40°C to +85°C operation. Pin 14 is N.C. (not internally connected); all analog pins (COMA, COMB, NO0A–NO3A, NO0B–NO3B) are fully bidirectional.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG732BRUZ and TMUX1308PWR, the MAX350EPN uniquely combines dual independent 4-to-1 mux topology, true dual-supply operation (±2.7V to ±8V), asynchronous RESET, and daisy-chainable SPI interface - making it optimal for industrial and aerospace systems requiring robust, expandable, and temperature-stable analog routing.

Availability

MAX350EPN is available at Aetrix Electronics and suitable for industrial process monitoring, avionics sensor multiplexing, ATE channel expansion, and audio signal routing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for MAX350EPN 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 MAX350EPN belongs to Maxim's serially controlled analog switch/multiplexer product line, engineered specifically for high-accuracy, low-leakage, and robust signal routing in harsh-environment data acquisition and control systems.

FAQ

What is the operating temperature range of the MAX350EPN?

The MAX350EPN is specified for operation from -40°C to +85°C, denoted by the "E" grade suffix. This extended temperature range supports deployment in industrial control cabinets, avionics bays, and outdoor instrumentation where ambient conditions exceed commercial-grade limits. The device maintains full electrical specifications-including 100Ω max R_ON, 0.1nA off-leakage at +25°C, and 400ns turn-on time-across this entire range, as validated in the official Maxim datasheet revision 1.

Does the MAX350EPN support daisy-chaining with other MAX350EPN devices?

Yes, the MAX350EPN supports daisy-chaining via its DOUT pin, which outputs the shifted-in data delayed by eight clock cycles. When multiple MAX350EPN devices share a common CS, SCLK, and DIN bus, serial data propagates through the chain, and all devices update their switch states simultaneously on the rising edge of CS. This eliminates timing skew between channels and reduces microcontroller pin count - a key advantage confirmed in the MAX349/MAX350 datasheet Figure 5 and Detailed Description section.

What is the maximum supply voltage the MAX350EPN can tolerate on V+ and V−?

The MAX350EPN has absolute maximum ratings of V+ = -0.3V to +17V and V− = -17V to +0.3V, with recommended operational ranges of ±2.7V to ±8V for dual supplies or +2.7V to +16V for single-supply use. These limits are explicitly defined in the Absolute Maximum Ratings table of the datasheet. Exceeding them risks permanent damage; sustained operation above ±8V dual or +16V single is not supported, even if within absolute max values.

How does the RESET pin function on the MAX350EPN?

The RESET pin on the MAX350EPN is an asynchronous active-low input that forces all eight switches to the OFF state and clears the internal 8-bit shift register to zero, regardless of CS or SCLK state. Driving RESET low guarantees a known, safe configuration at power-up or after fault events. This behavior is documented in the General Description ("Upon power-up, all switches are off and the internal shift registers are reset to zero") and Pin Description sections of the MAX349/MAX350 datasheet.

Is the MAX350EPN pin-compatible with the MAX349 series?

No, the MAX350EPN is not pin-compatible with the MAX349 series. While both share the same 18-pin DIP/SO package outline, their pin functions differ significantly: MAX349 uses pins 6–13 for NO0–NO7 and pin 5 for COM, whereas MAX350 assigns pins 5, 10–13 to COMA/NO0A–NO3A and pins 6–9 to NO0B–NO3B, with COMB on pin 15. This structural difference is clearly shown in the Pin Configurations diagrams (pages 1 and 2 of the datasheet) and prevents direct substitution without PCB layout modification.