Analog Devices Inc./Maxim Integrated MAX395CWG+T

Overview

The MAX395CWG+T from Maxim Integrated is an 8-channel, serially controlled, single-pole/single-throw (SPST) CMOS analog switch with rail-to-rail signal handling, 100 Ω max on-resistance (±5V supplies), 5 Ω max channel-to-channel on-resistance match, and <0.1 nA off-leakage at +25°C. It operates from ±2.7V to ±8V dual supplies or +2.7V to +16V single supply, and is used in precision audio routing, industrial data-acquisition multiplexing, and ATE signal path switching.

For engineers reviewing the MAX395CWG+T datasheet, MAX395CWG+T pinout, MAX395CWG+T application, or MAX395CWG+T equivalent, key selection criteria include SPI/Microwire-compatible serial interface timing, guaranteed on-resistance flatness over ±3V signal range, daisy-chain capability via DOUT, asynchronous RESET functionality, and ESD robustness (>2kV per Method 3015.7).

Technical Context

The MAX395CWG+T implements an 8-bit shift register architecture synchronized to SCLK rising edges, with CS-controlled latching of switch states on its rising edge-fully compliant with SPI™ (CPOL=0, CPHA=0), QSPI™, and Microwire™ protocols. Its internal logic drives eight independent SPST switches using CMOS transmission gates biased by V+ and V−, enabling bidirectional conduction with matched R_ON and low charge injection (2–10 pC).

Each NO/COM pair supports rail-to-rail analog signals up to (V− − 2V) to (V+ + 2V); off-isolation exceeds −90 dB at 100 kHz, and crosstalk between any two channels is <−90 dB. Power-up default is all switches OFF with shift register reset to zero, and RESET input provides synchronous global deactivation independent of clock state.

Key Specifications

Pinout & Package

MAX395CWG+T is housed in a 24-pin Wide SO (Small Outline) package with standard 0.300″ body width and 0.025″ lead pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX335CNG+, the MAX395CWG+T saves 5 GPIOs and enables dynamic reconfiguration; versus ADG708BRUZ, it supports wider supply rails and true bipolar signal handling but trades off lower on-resistance and smaller package size.

Availability

MAX395CWG+T is available at Aetrix Electronics and suitable for industrial process-systems, avionics test interfaces, and automated test equipment requiring stable component supply across extended temperature and voltage ranges.

Supply support for MAX395CWG+T 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 industrial, automotive, communications, and computing applications.

The MAX395CWG+T belongs to Maxim's precision analog switch product line, engineered for low-leakage, low-R_ON, and serial-configurable signal routing in data-acquisition, instrumentation, and test systems.

FAQ

What supply configurations does the MAX395CWG+T support?

The MAX395CWG+T supports dual supplies from ±2.7V to ±8V or a single supply from +2.7V to +16V. When using single supply, V− must be connected to GND. The device maintains rail-to-rail analog signal handling across all supported supply ranges, and logic inputs remain TTL/CMOS-compatible at +5V or ±5V supplies.

How does the serial interface of the MAX395CWG+T operate?

The MAX395CWG+T uses a 3-wire SPI-compatible interface (SCLK, DIN, CS) with optional DOUT for daisy-chaining. Data is shifted in MSB-first on SCLK rising edges while CS is low; the rising edge of CS latches the 8-bit word to update all eight switches. DOUT outputs the same data delayed by eight clocks, enabling cascaded control of multiple MAX395CWG+T devices.

Is the MAX395CWG+T pin-compatible with other Maxim analog switches?

Yes-the MAX395CWG+T is pin-compatible with the industry-standard MAX335, allowing direct replacement in existing layouts. However, unlike the parallel-controlled MAX335, the MAX395CWG+T uses serial control, so firmware and PCB interconnects must be updated to support SCLK, DIN, CS, and optionally DOUT signals.

What is the function of the RESET pin on the MAX395CWG+T?

The RESET pin on the MAX395CWG+T is an asynchronous active-low input that forces all eight switches to the OFF state and clears the internal 8-bit shift register to zero, regardless of CS or SCLK state. It is typically tied to the system logic supply or driven by a microcontroller reset line to ensure known initial conditions at power-up or fault recovery.

Can the MAX395CWG+T be used in multiplexer configurations?

Yes-the MAX395CWG+T can implement 8×1, dual 4×2, or quad SPDT configurations. For an 8×1 mux, tie COM0–COM7 together as the output and use NO0–NO7 as inputs. For dual differential 4×2, group COM0–COM3 and COM4–COM7 separately, pairing NOx with NO(x+4). Fast-mode programming allows channel updates per clock cycle when needed.