Analog Devices Inc./Maxim Integrated MAX308CUE+

Overview

The MAX308CUE+ from Maxim Integrated is a precision single-ended 1-of-8 CMOS analog multiplexer with ≤100Ω on-resistance, <5Ω channel-to-channel on-resistance matching, and <10pC charge injection. It operates from +5V to +30V single supply or ±5V to ±20V dual supplies, supports rail-to-rail analog signal handling up to ±10V, and is used in sample-and-hold circuits, automatic test equipment, and audio signal routing.

For engineers reviewing the MAX308CUE+ datasheet, MAX308CUE+ pinout, MAX308CUE+ application, or MAX308CUE+ equivalent, this device is selected for high-precision analog switching where low leakage (<5nA NO-off at +85°C), fast transition time (<250ns), and guaranteed flat on-resistance (≤7Ω variation over signal range) are critical in battery-operated and military-grade systems.

Technical Context

The MAX308CUE+ implements a monolithic CMOS switch architecture with integrated decode logic for 3-bit address selection (A0–A2) and active-low enable (EN). Its silicon-gate process ensures electrostatic discharge protection >2000V and eliminates latch-up under specified operating conditions.

All eight normally open (NO1–NO8) inputs route bidirectionally to a common COM terminal; switching is break-before-make with tOPEN ≤450ns (typ). Signal integrity is preserved via low off-capacitance (CNO(OFF) = 3pF, CCOM(OFF) = 26pF) and high off-isolation (−75dB at 100kHz).

Key Specifications

Pinout & Package

MAX308CUE+ is housed in a 16-pin TSSOP package (4.4mm × 5.0mm, 0.65mm pitch), optimized for space-constrained PCB layouts while maintaining thermal performance (derating: 6.7mW/°C above +70°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX308CUE+, MAX308EUE+ offers identical performance with extended temperature qualification, while ADG408BRUZ trades precision parameters for broader availability and lower unit cost-making it viable only where metrological accuracy is relaxed.

Availability

MAX308CUE+ is available at Aetrix Electronics and suitable for automatic test equipment, sample-and-hold circuits, and audio signal routing requiring stable component supply across commercial temperature grades.

Supply support for MAX308CUE+ 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 high-performance analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.

The MAX308/MAX309 product line targets precision analog signal routing in environments requiring low leakage, flat on-resistance, and robust ESD tolerance - especially where legacy DG-series upgrades are needed.

FAQ

What is the maximum analog signal voltage range supported by the MAX308CUE+?

The MAX308CUE+ supports an analog signal range of ±10V when operated with ±15V supplies. With single-supply configurations (e.g., +12V), the usable range extends from 0V to V+, limited by the supply rails. The device maintains rail-to-rail capability, meaning signals can swing fully between V− and V+ without clipping or distortion - a key specification confirmed in the Electrical Characteristics table under "Analog Signal Range" for both dual and single-supply conditions.

Does the MAX308CUE+ require external pull-up or pull-down resistors on its address or enable pins?

No, the MAX308CUE+ does not require external pull-up or pull-down resistors on A0, A1, A2, or EN pins. Its CMOS inputs exhibit low input current (±1.0µA max at TA = TMIN to TMAX), and logic thresholds are strictly defined (VAL ≤0.8V for low, VAH ≥2.4V for high) - ensuring reliable interfacing with standard TTL/CMOS outputs. Internal input structure eliminates need for external biasing, reducing BOM count and layout complexity.

Can the MAX308CUE+ be used with unbalanced supplies such as +24V and −5V?

Yes, the MAX308CUE+ supports unbalanced supplies like +24V and −5V, provided the difference between V+ and V− does not exceed +44V and each supply remains within its absolute maximum rating (V+ ≤ 44V referenced to V−, GND ≤ 25V referenced to V−). This flexibility is explicitly stated in the Applications Information section and validated in Typical Operating Characteristics plots showing performance across varying supply combinations.

What is the guaranteed on-resistance flatness specification for the MAX308CUE+ and why does it matter?

The MAX308CUE+ guarantees on-resistance flatness of ≤7Ω maximum - defined as the difference between highest and lowest RON measured across the full specified analog signal range (±10V). This spec matters because flat RON prevents gain nonlinearity when switching varying-amplitude signals (e.g., sensor outputs), directly impacting measurement accuracy in precision data acquisition systems where ratiometric or calibrated scaling is applied.

Is the MAX308CUE+ pin-compatible with the industry-standard DG408 multiplexer?

Yes, the MAX308CUE+ is a plug-in upgrade for the DG408, sharing identical pinout, function, and logic interface. The datasheet explicitly states "improved parts are plug-in upgrades for the industry-standard DG408, DG409, DG508A, and DG509A." No PCB changes are required; users gain immediate benefits including lower on-resistance matching (<5Ω vs. typical 15Ω for DG408), reduced charge injection (<10pC vs. ~25pC), and enhanced ESD protection (>2000V vs. ~200V).