Analog Devices Inc./Maxim Integrated MAX354CPE+

Overview

MAX354CPE+ from Maxim Integrated is a fault-protected single 8-channel analog multiplexer IC designed for high-reliability signal routing in industrial and avionics systems. It operates from ±4.5V to ±18V dual supplies (or +4.5V to +36V single supply), features 350Ω max on-resistance, <0.5nA input leakage at +25°C, and guarantees break-before-make switching. It protects downstream circuitry against continuous ±40V overvoltage during power-up, power-down, or fault conditions.

For engineers reviewing the MAX354CPE+ datasheet, MAX354CPE+ pinout, MAX354CPE+ application, or MAX354CPE+ equivalent, key selection considerations include its series N-P-N fault-protection architecture, ±40V rail-to-rail fault tolerance with supplies off, 1.5mW max power consumption, TTL/CMOS-compatible logic thresholds (0.8V/2.4V), and guaranteed 100ns break-before-make interval.

Technical Context

The MAX354CPE+ implements a three-FET series structure (N–P–N) that dynamically limits fault current and clamps output voltage to ~1.5V below V+ and ~3V above V− when analog inputs exceed safe operating range. This architecture ensures no polarity reversal or glitching during overvoltage events, whether power supplies are active or absent.

Its digital interface uses ground-referenced logic thresholds (1.6V typical, -3mV/°C TC) independent of supply voltage, enabling robust operation across ±5V to ±18V rails. All switches turn off automatically when supplies are removed, and overvoltage on an enabled channel forces the on-resistance to rise asymptotically-effectively isolating the fault while maintaining correct output polarity.

Key Specifications

Pinout & Package

MAX354CPE+ is housed in a 16-pin plastic DIP package (0.300" width), RoHS-compliant and rated for 0°C to +70°C operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG508F and MAX358, the MAX354CPE+ uniquely combines address-decoded 8:1 multiplexing, full ±40V fault immunity with supplies off, and integrated break-before-make timing-reducing BOM count and layout risk in safety-critical signal routing.

Availability

MAX354CPE+ is available at Aetrix Electronics and suitable for industrial process control, avionics sensor conditioning, and ATE channel selection requiring stable component supply across extended temperature and high-reliability operational lifecycles.

Supply support for MAX354CPE+ 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 MAX354/MAX355 product line was engineered specifically for fault-tolerant analog signal routing in harsh environments-prioritizing rail-to-rail overvoltage survival, zero-power-state protection, and seamless integration with legacy TTL/CMOS control logic.

FAQ

What is the maximum continuous overvoltage the MAX354CPE+ can withstand with power supplies disconnected?

The MAX354CPE+ withstands ±40V continuous overvoltage on any analog input or output pin-even when V+ and V− are at 0V. This is achieved via its internal series N-P-N FET structure, which blocks conduction paths during fault conditions without requiring external components. The MAX354CPE+ remains fully protected during power-up, power-down, and complete supply loss scenarios.

Does the MAX354CPE+ support demultiplexing operation, and is fault protection maintained?

Yes, the MAX354CPE+ supports bidirectional signal flow and functions as a demultiplexer when the COM pin is driven and NOx pins are used as outputs. Fault protection-including ±40V tolerance and output clamping-is fully retained in demultiplexing mode. Break-before-make timing also remains guaranteed, preventing momentary shorts during channel reconfiguration.

What is the guaranteed break-before-make interval for the MAX354CPE+, and why is it critical?

The MAX354CPE+ guarantees a minimum 100ns break-before-make interval between channel selections. This prevents simultaneous connection of two NOx inputs to the COM terminal, eliminating risk of signal contention, current backflow, or damage to upstream sources. In data acquisition systems with shared reference planes or multiple voltage domains, this timing ensures signal integrity and system reliability.

Can the MAX354CPE+ operate from a single +12V supply, and how does that affect analog signal range?

Yes, the MAX354CPE+ operates from a single +12V supply with V− tied to GND. In this configuration, the analog signal range is limited to approximately 0V to +10.5V (V+ − 1.5V), since the output clamps ~1.5V below V+. Input signals beyond this range will trigger fault-limiting behavior. RON remains within spec, and logic thresholds stay compatible with standard TTL levels.

How does the MAX354CPE+ handle input leakage current over temperature, and what impact does it have on high-impedance circuits?

The MAX354CPE+ specifies input leakage current as <0.5nA at +25°C and <5nA at +85°C across all NO and COM terminals. In high-impedance applications-such as thermocouple amplification or piezoelectric sensor buffering-this low leakage prevents significant voltage drop across source impedances >10MΩ, preserving DC accuracy and minimizing drift-induced errors in precision measurement paths.