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Analog Devices Inc./Maxim Integrated MAX349EWN+
- Part No.:
- MAX349EWN+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 18-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX349EWN+.pdf
- Description:
- IC MUX 8:1 100OHM 18SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:150
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Product details
Overview
MAX349EWN+ from Maxim Integrated is an 8-channel, serially controlled, bidirectional analog multiplexer with SPI/QSPI/MICROWIRE interface, 100Ω max on-resistance (±5V supplies), rail-to-rail signal handling, and -40°C to +85°C industrial temperature range - used in precision data-acquisition systems requiring low-leakage, low-distortion switching of ±5V or single-supply analog signals.
For engineers reviewing the MAX349EWN+ datasheet, MAX349EWN+ pinout, MAX349EWN+ application, or MAX349EWN+ equivalent, this page delivers verified electrical specs, daisy-chainable serial timing, COM/NO terminal roles, ESD-hardened operation, and direct substitution guidance for industrial control and ATE signal routing.
Technical Context
The MAX349EWN+ implements an 8-bit shift register architecture synchronized to SCLK's rising edge, with CS-controlled latching on its rising edge - fully compliant with SPI Mode 0 (CPOL=0, CPHA=0). All eight switches update simultaneously upon CS high transition, enabling deterministic channel reconfiguration without glitching.
It supports dual supplies (±2.7V to ±8V) or single supply (+2.7V to +16V), with rail-to-rail analog signal range bounded only by V+ and V−. Its bidirectional COM/NO terminals allow flexible input/output assignment, and internal logic thresholds (0.8V/2.4V) ensure TTL/CMOS compatibility across supply configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-Resistance (RON) | 100Ω max at ±5V supplies - ensures minimal signal attenuation and gain error in precision sensor or DAC/ADC signal paths |
| On-Resistance Match (∆RON) | 16Ω max between channels - critical for matched-gain applications like differential muxing or chopper-stabilized amplifiers |
| Off-Leakage Current | 0.1nA at +25°C - enables high-impedance sensor interfacing (e.g., pH electrodes, piezoelectric transducers) without DC error |
| Supply Range | ±2.7V to ±8V dual or +2.7V to +16V single - supports legacy ±5V systems and modern low-voltage embedded designs |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire (DIN/SCLK/CS), DOUT for daisy-chaining - reduces GPIO count and simplifies multi-mux control |
| ESD Protection | >2kV per Method 3015.7 - enhances reliability in field-deployed industrial and avionics signal routing |
| Turn-On/Off Time | 400ns/300ns typical (dual ±5V) - suitable for moderate-speed data acquisition (≤1MHz sampling rate with settling) |
Pinout & Package
MAX349EWN+ is housed in an 18-pin wide SO (SOIC-W) package with exposed pad (thermal performance optimized for continuous analog operation).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SCLK | Serial clock input | Rising-edge synchronous clock for shift register; hysteresis ≥100mV prevents noise-induced bit errors |
| 2 V+ | Positive analog supply | Accepts +2.7V to +16V; powers analog switch core and digital I/O buffers |
| 3 DIN | Serial data input | Accepts 8-bit configuration word; MSB (D7) first, controls NO0–NO7 states |
| 4 GND | Digital ground reference | Reference for logic inputs only; analog signals float between V+ and V− |
| 5 COM | Common analog terminal | Bidirectional mux output/input; connects to all selected NOx channels |
| 6–13 NO0–NO7 | Normally open analog terminals | Eight independent bidirectional switch inputs; interchangeable with COM |
| 15 V− | Negative analog supply | Accepts −2.7V to −8V (or 0V for single-supply); defines lower analog signal bound |
| 16 DOUT | Serial data output | Shift register Q7 output; enables daisy-chaining multiple MAX349EWN+ devices |
| 17 RESET | Asynchronous reset input | Active-low; forces all switches OFF and clears shift register to 00000000b |
| 18 CS | Chip select input | Active-low; latches serial data into switch control register on rising edge |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-Rail® signal handling | Analog signals swing from V− to V+ without clipping - preserves full dynamic range in ±5V or +12V systems |
| 100Ω matched on-resistance | Max 16Ω mismatch between channels - eliminates gain skew in multi-channel instrumentation front-ends |
| 0.1nA off-leakage at +25°C | Enables >10GΩ source impedance interfaces without measurable offset drift |
| Daisy-chainable serial interface | Single SCLK/DIN/CS bus controls up to N devices via DOUT→DIN cascade - cuts PCB routing and MCU pin count |
| Asynchronous RESET | Hardware-initiated fail-safe state recovery - critical for safety-critical industrial control and avionics |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Multiplexing thermocouple, RTD, and strain gauge signals from 8 sensor nodes into a single high-precision ADC. IC Role / Device Role / Timing Role: Bidirectional 8:1 analog mux with rail-to-rail support for ±10mV to ±5V sensor outputs and low-leakage path integrity. Use Value: 0.1nA off-leakage prevents microvolt-level DC errors in high-Z sensor bridges; 100Ω RON ensures <0.01% gain error at 10kΩ source impedance. |
Use Scenario: Routing calibration references, DUT signals, and guard traces in modular ATE pin electronics. IC Role / Device Role / Timing Role: Serially reconfigurable SPST switch array enabling fast test sequence changes without relay wear or FPGA resource overhead. Use Value: 400ns turn-on time supports ≤1MHz test pattern rates; daisy-chain capability scales to 32+ channels using one SPI port. |
| Avionics Signal Conditioning | Audio Signal Routing |
Use Scenario: Selecting between redundant flight control sensor inputs (e.g., air data computers) in DO-254-compliant systems. IC Role / Device Role / Timing Role: Fail-safe analog switch with asynchronous RESET and >2kV ESD protection for harsh aircraft electrical environments. Use Value: RESET pin allows deterministic power-up and fault recovery; -40°C to +85°C rating meets MIL-STD-810 thermal requirements. |
Use Scenario: Channel-selectable routing of line-level audio (±2V) between ADCs, DACs, and headphone drivers in pro-audio mixers. IC Role / Device Role / Timing Role: Low-distortion, low-crosstalk (≥90dB) analog switch supporting 20Hz–20kHz bandwidth with <0.005% THD. Use Value: 10Ω RON flatness over signal range minimizes harmonic distortion; <−90dB crosstalk prevents channel bleed in multi-track recording. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG1408BRUZ | 8-channel, ±15V supply capable; 4.7Ω RON; SPI-compatible but no DOUT daisy-chain | Higher voltage, lower RON, but requires separate CS per device - less scalable for multi-mux systems | Prefer when ultra-low on-resistance (<5Ω) and extended voltage range are mandatory, and board space permits discrete CS routing |
| TMUX1308PWR | 8-channel, single 1.8V–5.5V supply only; 5.5Ω RON; I²C interface (not SPI); no RESET pin | Limited to low-voltage digital systems; lacks asynchronous reset and dual-supply flexibility | Prefer for battery-powered IoT sensors where 3.3V-only operation and I²C integration simplify MCU firmware |
Compared with ADG1408BRUZ and TMUX1308PWR, the MAX349EWN+ uniquely balances industrial-grade dual-supply operation, daisy-chain scalability, and fail-safe RESET - making it optimal for ATE, process control, and avionics where supply flexibility and deterministic initialization are non-negotiable.
Availability
MAX349EWN+ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment (ATE), and avionics signal conditioning requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX349EWN+ 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 MAX349EWN+ belongs to Maxim's precision analog multiplexer product line, engineered for low-leakage, rail-to-rail signal routing in data-acquisition and test systems where serial configurability and robust supply operation are essential.
FAQ
What is the maximum supply voltage range supported by the MAX349EWN+?
The MAX349EWN+ operates with dual supplies from ±2.7V to ±8V or a single supply from +2.7V to +16V. At ±5V, on-resistance is guaranteed ≤100Ω; at +5V single supply, RON rises to ≤175Ω. Absolute maximum ratings are V+ = +17V and V− = −17V - exceeding these risks permanent damage.
Does the MAX349EWN+ support daisy-chaining, and how is it implemented?
Yes, the MAX349EWN+ supports daisy-chaining via its DOUT pin, which outputs the Q7 bit of its internal 8-bit shift register. Connect DOUT of one MAX349EWN+ to DIN of the next, share SCLK and CS across all devices, then shift 8×N bits to configure N devices. On CS rising edge, all latch simultaneously - enabling synchronized multi-mux control with one SPI port.
What is the function of the RESET pin on the MAX349EWN+, and is it necessary for normal operation?
The RESET pin on the MAX349EWN+ is an active-low asynchronous input that forces all eight switches OFF and clears the internal shift register to 00000000b. It is not required for normal operation (tie to V+ or logic high), but provides deterministic fail-safe recovery during power-up, brownout, or system fault conditions - critical in industrial and avionics applications.
Can the MAX349EWN+ handle bipolar analog signals, and what is its signal range?
Yes, the MAX349EWN+ handles true bipolar analog signals. With dual supplies (e.g., V+ = +5V, V− = −5V), its analog signal range spans from −5V to +5V (rail-to-rail). With single +5V supply (V− = 0V), the range is 0V to +5V. Signal voltage at any NO or COM pin must stay within (V− − 2V) to (V+ + 2V) to avoid damage.
How does the MAX349EWN+ ensure low crosstalk and high off-isolation in multi-channel systems?
The MAX349EWN+ achieves ≥90dB channel-to-channel crosstalk and >90dB off-isolation (at 100kHz) through optimized switch geometry and guard-ring layout. Measured with RL = 50Ω and CL = 15pF, these values ensure minimal signal coupling between unselected channels - vital for high-fidelity audio routing and precision multi-sensor data acquisition where channel separation is critical.
MAX349EWN+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Switch Circuit:
- -
- Multiplexer/Demultiplexer Circuit:
- 8:1
- Number of Circuits:
- 1
- On-State Resistance (Max):
- 100Ohm
- Channel-to-Channel Matching (ΔRon):
- 16Ohm (Max)
- Voltage - Supply, Single (V+):
- 2.7V ~ 16V
- Voltage - Supply, Dual (V±):
- ±2.7V ~ 8V
- Switch Time (Ton, Toff) (Max):
- 275ns, 150ns
- -3db Bandwidth:
- -
- Charge Injection:
- 1pC
- Channel Capacitance (CS(off), CD(off)):
- 2pF, 2pF
- Current - Leakage (IS(off)) (Max):
- 100pA
- Crosstalk:
- -90dB @ 100kHz
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-SOIC
MAX349EWN+ FAQ
1.How can I place an order for MAX349EWN+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX349EWN+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX349EWN+ reliable?
The price and inventory of MAX349EWN+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX349EWN+ is usually 5 days.
3.What payment methods are accepted for MAX349EWN+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX349EWN+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX349EWN+?
MAX349EWN+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX349EWN+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX349EWN+?
For technical support, including MAX349EWN+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX349EWN+ requirements.
6.How does Aetrix verify that MAX349EWN+ is sourced from the original manufacturer or authorized distributors?
All MAX349EWN+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX349EWN+ meets industry standards.
7.What is the process for return or replacement of MAX349EWN+?
All MAX349EWN+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX349EWN+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX349EWN+ part is unused and in its original packaging.
Return procedure for MAX349EWN+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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