Analog Devices Inc./Maxim Integrated MAX4534CPD

Overview

MAX4534CPD from Maxim Integrated is a fault-protected, single 4-to-1 analog multiplexer IC designed for high-voltage signal routing in harsh environments. It operates with ±4.5V to ±20V dual supplies or +9V to +36V single supply, delivers 400Ω max on-resistance, ±40V fault protection with supplies off, and rail-to-rail signal handling - enabling robust data acquisition in industrial control and avionics systems.

For engineers reviewing the MAX4534CPD datasheet, MAX4534CPD pinout, MAX4534CPD application, or MAX4534CPD equivalent, key selection criteria include its ±40V fault tolerance with power off, 20ns typical fault response time, TTL/CMOS-compatible logic inputs, and 14-pin plastic DIP package rated for 0°C to +70°C operation.

Technical Context

The MAX4534CPD uses parallel N- and P-channel FETs per channel to achieve low on-resistance and true rail-to-rail signal pass-through. Its dual-comparator fault-detection circuit clamps the COM output to V+ or V− within ~150mV of the rails during overvoltage events on any NO_ input.

Fault response is asymmetric: positive faults clamp COM to V+, negative faults clamp COM to V−, and both disable the main switch path. With supplies off, NO_ pins present virtual open-circuit behavior up to ±40V, while COM remains unprotected and must stay within V+ and V−.

Key Specifications

Pinout & Package

MAX4534CPD is housed in a 14-pin plastic DIP package with 0.3-inch body width and standard through-hole footprint. Pin 1 is A0 (LSB address), pin 7 is COM (common analog output), and all NO_ inputs (pins 4, 5, 11, 10) are fault-protected. Power pins are V+ (pin 12), V− (pin 3), and GND (pin 13); EN (pin 2) controls global switch enable.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX4534ESD, the MAX4534CPD offers lower cost and through-hole compatibility but lacks extended temperature support; compared with ADG508FBRUZ, it provides superior rail-to-rail performance and faster fault response, though with fewer channels.

Availability

MAX4534CPD is available at Aetrix Electronics and suitable for industrial process monitoring, avionics sensor routing, and redundant backup systems requiring stable component supply across long production lifecycles.

Supply support for MAX4534CPD 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) is a semiconductor company specializing in precision analog, mixed-signal, and high-reliability interface solutions for demanding industrial, automotive, and communications applications.

The MAX4534 product line was engineered specifically for fault-tolerant signal routing in safety-critical systems where overvoltage resilience, rail-to-rail operation, and predictable fault clamping are mandatory design requirements.

FAQ

What is the maximum fault voltage the MAX4534CPD can withstand with power supplies disconnected?

The MAX4534CPD sustains ±40V on any NO_ pin (pins 4, 5, 11, 10) when V+ and V− are at 0V. This allows safe connection to unpowered external circuits or floating sensor lines without damage. The COM pin remains unprotected and must stay within V+ and V−, so it must be left floating or terminated within supply rails during power-off conditions. MAX4534CPD maintains this rating across its full 0°C to +70°C operating range.

Does the MAX4534CPD support rail-to-rail analog signal transmission?

Yes, the MAX4534CPD passes analog signals from V− to V+ without clipping, enabling full utilization of sensor or DAC output ranges. This is achieved via complementary N- and P-channel FETs operating in parallel per channel. The specification holds across its entire supply range (±4.5V to ±20V dual or +9V to +36V single) and is verified down to ±10V COM voltage swing. MAX4534CPD achieves this while maintaining ≤400Ω on-resistance and <10Ω channel-to-channel RON matching.

How does the MAX4534CPD behave during an overvoltage fault on an NO_ input?

When an NO_ input exceeds V+ or falls below V− by ~150mV, internal comparators disable the main N/P-FET switch path within 20ns and activate clamp FETs to pull COM to V+ (positive fault) or V− (negative fault). During this state, the NO_ pin becomes high-impedance, isolating the fault source. Recovery takes ~2.5µs (positive) or ~1.3µs (negative) after the fault clears. MAX4534CPD implements this behavior identically across all four NO_ inputs and is validated per Absolute Maximum Ratings.

Can the MAX4534CPD operate from a single +12V supply?

Yes, the MAX4534CPD operates from a single +12V supply with V− connected to GND. In this configuration, it supports analog signals from 0V to +12V, maintains 400Ω max on-resistance, and retains ±25V fault protection on NO_ pins with supplies on. Logic inputs remain TTL/CMOS-compatible (0.8V low / 2.4V high), and all timing parameters (tON, tOFF, tBBM) meet datasheet specifications. MAX4534CPD is characterized across +9V to +36V single-supply operation.

Which pins of the MAX4534CPD are fault-protected?

Only the NO_ pins - pins 4 (NO1), 5 (NO2), 11 (NO3), and 10 (NO4) - are fault-protected on the MAX4534CPD. The COM pin (pin 7), address pins (A0 pin 1, A1 pin 14), enable pin (EN pin 2), and power pins (V+ pin 12, V− pin 3, GND pin 13) are not fault-protected. Applying voltages beyond V+ or V− to unprotected pins risks damage via ESD diode conduction. MAX4534CPD's fault protection architecture explicitly excludes these terminals per the Absolute Maximum Ratings table and Detailed Description section.