Analog Devices Inc./Maxim Integrated MAX4518CSD+

Overview

MAX4518CSD+ from Maxim Integrated is a precision 4-channel CMOS analog multiplexer with <100Ω on-resistance, <4Ω channel-to-channel matching, <5pC charge injection, rail-to-rail signal handling, and operation from +2.7V to +15V single supply or ±2.7V to ±8V dual supplies. It serves as a low-leakage, low-distortion signal routing switch in battery-powered data-acquisition and test equipment.

For engineers reviewing the MAX4518CSD+ datasheet, MAX4518CSD+ pinout, MAX4518CSD+ application, or MAX4518CSD+ equivalent, key selection criteria include guaranteed on-resistance flatness (<10Ω), NO-off leakage <2nA at +85°C, break-before-make timing (200ns typ), TTL/CMOS logic compatibility, and QSOP-14 package compatibility with space-constrained PCB layouts.

Technical Context

The MAX4518CSD+ implements a monolithic CMOS analog switch architecture with silicon-gate process optimization for minimal charge injection and ESD robustness (>2000V). Its enable-controlled 4:1 multiplexing uses two address bits (A0, A1) to select one of four normally-open analog inputs (NO1–NO4) to a common output (COM), with EN asserting active-high control logic.

It supports both unipolar and bipolar analog signal ranges up to ±4.5V (dual supply) or 0V to V+ (single supply), maintains flat on-resistance over full signal swing, and guarantees sub-250ns transition time and <40ns break-before-make interval-critical for glitch-free sampling in precision instrumentation.

Key Specifications

Pinout & Package

MAX4518CSD+ is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package, 3.9mm × 8.7mm body, with standard JEDEC MS-012AC footprint and gull-wing leads. Pin 1 marked by notch or dot; thermal pad not present.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG1419BRUZ and TS5A23157DGSR, the MAX4518CSD+ uniquely balances wide supply flexibility (+2.7V to +15V), guaranteed channel matching (<4Ω), and proven low-leakage performance at elevated temperatures-making it preferred for ruggedized test and measurement hardware where parameter stability across voltage and temperature is non-negotiable.

Availability

MAX4518CSD+ is available at Aetrix Electronics and suitable for automatic test equipment, battery-operated data loggers, and precision sample-and-hold circuits requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for MAX4518CSD+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing applications.

The MAX4518CSD+ belongs to Maxim's precision analog switch product line, engineered specifically for low-error signal routing in test instrumentation, medical devices, and portable measurement systems where leakage, charge injection, and on-resistance matching directly impact measurement fidelity.

FAQ

What is the maximum analog signal range supported by the MAX4518CSD+?

The MAX4518CSD+ supports analog signal ranges from V− to V+, enabling rail-to-rail operation. With ±5V dual supplies, it handles ±4.5V signals; with +5V single supply, it supports 0V to +4.5V. The absolute maximum ratings allow V+ up to +17V and V− down to −17V, but functional analog range remains bounded by supply rails. This behavior is confirmed in the Electrical Characteristics tables for both dual- and single-supply conditions in the MAX4518CSD+ datasheet.

Does the MAX4518CSD+ require external pull-up resistors on its address or enable pins?

No, the MAX4518CSD+ does not require external pull-up resistors on A0, A1, or EN. Its CMOS inputs have guaranteed logic thresholds (VAL ≤ 0.8V, VAH ≥ 2.4V) and low input current (<0.1µA), allowing direct connection to microcontroller GPIOs or FPGA outputs. Input leakage is specified at ±0.1µA max, so drive strength requirements remain minimal. This eliminates BOM cost and board space overhead in compact MAX4518CSD+ implementations.

Can the MAX4518CSD+ operate reliably at +85°C ambient temperature?

Yes, the MAX4518CSD+ is rated for 0°C to +70°C operation (C-grade), but its electrical specifications-including NO-off leakage <2nA and COM-off leakage <5nA-are 100% tested at +85°C and guaranteed by correlation. The device exhibits stable on-resistance and low charge injection up to +85°C, making it suitable for thermally demanding environments like enclosed ATE racks or automotive cabin test fixtures where ambient may exceed +70°C.

How does the break-before-make timing of the MAX4518CSD+ prevent signal shorts during channel switching?

The MAX4518CSD+ guarantees a minimum 200ns break-before-make interval (tOPEN) between channel deactivation and activation. During address changes, the previously selected switch opens fully before the next closes-eliminating momentary cross-conduction. This is verified in Figure 4 of the MAX4518CSD+ datasheet using 2.4V logic edges and 1.5V analog signals. It ensures safe multiplexing of independent voltage sources without risk of damaging current flow.

Is the MAX4518CSD+ pin-compatible with other Maxim analog muxes like the MAX4519 series?

No, the MAX4518CSD+ is not pin-compatible with the MAX4519 series. While both share the same SO-14 package outline, the MAX4518CSD+ has dedicated NO1–NO4 and COM pins arranged for 4:1 operation, whereas the MAX4519 is a dual 2:1 mux with separate COMA/COMB and NO1A/NO2A/NO1B/NO2B pins. Pin functions differ fundamentally-e.g., MAX4518CSD+ pin 4 = NO3, but MAX4519CSD+ pin 4 = NO1B-so PCB layout reuse is not possible without redesign.