Analog Devices Inc./Maxim Integrated MAX308CPE

Overview

MAX308CPE 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 and is used in sample-and-hold circuits, automatic test equipment, and military radio signal routing.

For engineers reviewing the MAX308CPE datasheet, MAX308CPE pinout, MAX308CPE application, or MAX308CPE equivalent, key selection criteria include on-resistance flatness (≤7Ω over ±10V signal range), NO-off leakage (<5nA at +85°C), enable switching times (tON(EN) ≤ 600ns, tOFF(EN) ≤ 300ns), and rail-to-rail analog signal handling capability.

Technical Context

The MAX308CPE implements a CMOS decode logic architecture with three address inputs (A0–A2) and an active-low enable (EN) controlling connection of one of eight bidirectional analog inputs (NO1–NO8) to the common terminal (COM). Its silicon-gate process ensures low charge injection and high ESD tolerance (>2000V).

It supports both unipolar and bipolar operation without external level-shifting: analog signals swing rail-to-rail (e.g., ±10V with ±15V supplies), while TTL/CMOS-compatible digital inputs (VAL ≤ 0.8V, VAH ≥ 2.4V) interface directly to microcontrollers or FPGAs. Break-before-make timing (tOPEN ≤ 450ns) prevents signal shorting during channel transitions.

Key Specifications

Pinout & Package

MAX308CPE is housed in a 16-pin plastic DIP package (0°C to +70°C operating range) with 0.3-inch body width and through-hole mounting. Pin 1 is A2 (MSB address), pin 8 is COM (common analog terminal), and pin 16 is V+ (positive supply).

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADG408BNZ and DG408DJ, the MAX308CPE delivers tighter on-resistance matching (<5Ω vs. ≥10Ω), lower charge injection (<10pC vs. ≥20pC), and guaranteed flatness (7Ω) - making it superior for precision data acquisition and low-glitch sample-and-hold designs.

Availability

MAX308CPE is available at Aetrix Electronics and suitable for sample-and-hold circuits, automatic test equipment, and military radio systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for MAX308CPE 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 automotive markets.

The MAX308CPE belongs to Maxim's precision analog multiplexer product line, designed specifically for high-accuracy signal routing in data acquisition, test instrumentation, and ruggedized embedded systems.

FAQ

What is the maximum analog signal range supported by the MAX308CPE?

The MAX308CPE supports analog signals from V− to V+, enabling rail-to-rail operation. With ±15V dual supplies, the full range is ±15V; with +12V/0V single supply, it handles 0V to +12V. The device guarantees flat on-resistance over ±10V with ±15V supplies, and absolute maximum analog voltage is limited by the supply rails (V− −2V to V+ +2V per Absolute Maximum Ratings).

Does the MAX308CPE require external pull-up or pull-down resistors on its address pins?

No, the MAX308CPE does not require external pull-up or pull-down resistors on A0, A1, or A2. Its CMOS inputs have high impedance and defined TTL/CMOS-compatible thresholds (VAL ≤ 0.8V, VAH ≥ 2.4V), allowing direct connection to microcontroller GPIOs or FPGA outputs without additional biasing components.

Can the MAX308CPE operate with unbalanced supplies such as +24V and −5V?

Yes, the MAX308CPE supports unbalanced supplies - for example, +24V and −5V - as long as the difference between V+ and V− does not exceed +44V and both remain within their absolute maximum ratings (V+ ≤ V− + 44V, V− ≥ −0.3V). This flexibility simplifies power design in mixed-voltage systems.

How does the enable (EN) pin function in the MAX308CPE?

The EN pin is active-low: when pulled low, the selected channel connects COM to the addressed NOx terminal; when high, all switches open, isolating COM from all NOx inputs. This reduces system power consumption and leakage (<1µA total supply current in disabled state) and prevents unintended signal coupling during initialization or sleep modes.

Is the MAX308CPE pin-compatible with the DG408 multiplexer?

Yes, the MAX308CPE uses the same 16-pin DIP footprint and pinout as the DG408, including identical placement of A0–A2, EN, COM, NO1–NO8, V+, V−, and GND. It is explicitly documented as a plug-in upgrade, requiring no PCB modifications when replacing DG408 or DG508A in existing designs.