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Analog Devices Inc./Maxim Integrated MAX349CWN+T
- Part No.:
- MAX349CWN+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- -
- Datasheet:
-
MAX349CWN+T.pdf
- Description:
- IC INTEGRATED CIRCUIT
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Product details
Overview
MAX349CWN+T from Maxim Integrated is an 8-channel, serially controlled, bidirectional analog multiplexer with SPI/QSPI/MICROWIRE-compatible interface, 100Ω max on-resistance (±5V supplies), rail-to-rail signal handling, and ±2.7V to ±8V dual-supply or +2.7V to +16V single-supply operation - used in industrial data-acquisition systems for routing multiple sensor signals to a shared ADC.
For engineers reviewing the MAX349CWN+T datasheet, MAX349CWN+T pinout, MAX349CWN+T application, or MAX349CWN+T equivalent, this page delivers verified specifications, package-confirmed pin functions, real-world use cases in ATE and avionics, and two validated alternative parts with documented functional and supply-voltage differences.
Technical Context
The MAX349CWN+T implements an 8-bit shift-register-based serial control architecture synchronized to SCLK's rising edge, with CS-driven latch update on its rising edge - fully compliant with SPI Mode 0 (CPOL=0, CPHA=0). All eight switches are independently controllable via DIN, and DOUT enables daisy-chaining of multiple devices.
It supports true bidirectional analog signal routing with matched on-resistance (≤16Ω) and flat on-resistance (≤10Ω over ±3V range), enabling precision multiplexing without channel-dependent gain error. Off-leakage is specified at ≤0.1nA at +25°C and ≤5nA at +85°C, critical for high-impedance sensor front-ends.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-resistance (RON) | 100Ω max at ±5V supplies - ensures minimal signal attenuation and voltage drop across active channels. |
| On-resistance match | ≤16Ω max between channels - maintains consistent gain and offset across multiplexed inputs. |
| Rail-to-rail analog range | VCOM/VNO = V− to V+ - supports full dynamic range of ±5V, ±3V, or single 0–5V/0–12V signals without clipping. |
| Off-leakage current | 0.1nA max at +25°C - preserves accuracy in high-impedance measurement paths (e.g., thermocouples, pH sensors). |
| Supply range | ±2.7V to ±8V dual or +2.7V to +16V single - enables flexible power architecture in mixed-signal industrial systems. |
| Serial interface | SPI/QSPI/MICROWIRE-compatible 3-wire (DIN/SCLK/CS), DOUT for daisy-chain - reduces MCU GPIO count and simplifies multi-mux control. |
| Turn-on time | 400ns max (dual ±5V) - supports high-speed channel switching in automated test equipment. |
Pinout & Package
MAX349CWN+T is housed in an 18-pin wide SO (SOIC-W) package with 0.3" body width and standard gull-wing leads. Pin 14 is N.C. (not internally connected); all other pins match the MAX349 functional pinout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SCLK | Serial clock input | Drives synchronous data capture on rising edge; compatible with SPI master clocks up to 2.1MHz. |
| 2 V+ | Positive analog supply | Accepts +2.7V to +16V (single) or +4.5V to +5.5V (dual); powers analog switch core and digital logic. |
| 3 DIN | Serial data input | Accepts 8-bit configuration word; MSB (D7) first - controls NO0–NO7 switch states. |
| 4 GND | Digital ground reference | Reference for logic inputs only; analog signals float between V+ and V− with no ground dependency. |
| 5 COM | Common analog terminal | Bidirectional mux output/input; connects to ADC input or signal source depending on system topology. |
| 6–13 NO0–NO7 | Normally open analog inputs | Eight independent, bidirectional analog channels; each connects to COM when corresponding bit = 1. |
| 15 V− | Negative analog supply | Accepts −2.7V to −8V (dual) or 0V (single-supply mode); defines lower rail of analog signal range. |
| 16 DOUT | Serial data output | Shift register output delayed by 8 clocks; enables cascading multiple MAX349s without additional MCU I/O. |
| 17 RESET | Asynchronous reset input | Pulling low forces all switches OFF and clears internal shift register - ensures known state after power-up or fault recovery. |
| 18 CS | Chip-select input | Active-low enable; rising edge latches serial data and updates switch configuration atomically. |
Key Features
| Feature | Design Value |
|---|---|
| 8 independently controllable SPST switches | Enables arbitrary channel selection - e.g., NO2 and NO5 simultaneously routed to COM for differential sensing or redundancy. |
| Rail-to-rail signal handling | Supports analog signals spanning full V− to V+ range - eliminates level-shifting in ±5V op-amp or sensor interfaces. |
| Matched and flat on-resistance | ≤16Ω channel-to-channel RON mismatch and ≤10Ω variation over ±3V range - minimizes crosstalk-induced gain error in precision measurement. |
| Asynchronous RESET input | Guarantees deterministic OFF state regardless of serial bus activity - critical for safety-critical or fail-safe system initialization. |
| 2kV ESD protection (HBM) | Meets Method 3015.7 - protects against handling damage during PCB assembly and field maintenance. |
Applications
| Industrial Data-Acquisition Systems | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Multiplexing 8 temperature, pressure, and strain sensor outputs into a single high-resolution ADC in a PLC module. IC Role / Device Role / Timing Role: Analog signal router with deterministic 400ns turn-on time and <0.1nA off-leakage to preserve sensor signal integrity. Use Value: Eliminates need for 8 parallel ADCs while maintaining measurement accuracy and enabling software-configurable channel sequencing. | Use Scenario: Routing calibrated reference voltages and DUT signals to metrology-grade digitizers in semiconductor wafer probers. IC Role / Device Role / Timing Role: Precision analog switch with matched RON and >90dB off-isolation to prevent cross-talk between test stimulus and measurement paths. Use Value: Enables high-throughput parametric testing with sub-LSB error budget compliance across all 8 channels. |
| Avionics Signal Management | Audio Signal Routing |
Use Scenario: Selecting among redundant inertial measurement unit (IMU) analog outputs for flight control arbitration logic. IC Role / Device Role / Timing Role: Fail-operational analog multiplexer with asynchronous RESET and dual-supply support for ±5V aircraft buses. Use Value: Provides deterministic channel isolation and rapid reconfiguration during sensor fault detection and voting cycles. | Use Scenario: Dynamically routing line-level audio inputs (mic, instrument, playback) to a shared codec in professional audio mixers. IC Role / Device Role / Timing Role: Low-distortion, rail-to-rail analog switch with <0.01% THD+N at 1kHz - preserving audio fidelity across all gain settings. Use Value: Supports zero-latency hardware-based input switching without digital processing delay or sample-rate conversion artifacts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG708BRUZ | 8-channel CMOS mux, 3.5Ω typical RON (±5V), SPI-compatible but no DOUT daisy-chain; operates only on single 1.8–5.5V supply. | Not suitable for dual-supply ±5V systems or daisy-chained multi-mux configurations requiring minimal MCU I/O. | Select ADG708BRUZ only for low-RON, low-voltage (≤5V) single-supply designs where daisy-chaining is unnecessary. |
| TMUX1308PWR | 8-channel mux, 4.5Ω typical RON (3.3V), I²C interface (not SPI), no RESET pin, supports 1.08–5.5V supply only. | Requires I²C host and cannot replace MAX349CWN+T in SPI-based legacy systems or those needing guaranteed power-up OFF state. | Choose TMUX1308PWR for new I²C-based designs prioritizing ultra-low RON and low quiescent current over serial protocol compatibility. |
Compared with ADG708BRUZ and TMUX1308PWR, the MAX349CWN+T uniquely combines SPI daisy-chain capability, dual-supply flexibility, asynchronous RESET, and guaranteed sub-nA leakage - making it irreplaceable in high-reliability, multi-mux industrial and avionics signal-routing architectures.
Availability
MAX349CWN+T is available at Aetrix Electronics and suitable for industrial data-acquisition systems, automated test equipment, and avionics signal management requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for MAX349CWN+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 precision analog, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing applications.
The MAX349CWN+T belongs to Maxim's serially controlled analog switch/multiplexer product line, engineered for high-accuracy, low-leakage, and protocol-flexible signal routing in resource-constrained embedded systems.
FAQ
What supply voltages does the MAX349CWN+T support?
The MAX349CWN+T supports 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. The device maintains rail-to-rail analog signal handling across all supported supply configurations, and V− must be tied to GND in single-supply mode.
How does the serial interface of the MAX349CWN+T work?
The MAX349CWN+T uses a 3-wire SPI-compatible interface (DIN, SCLK, CS) with DOUT for daisy-chaining. Data is clocked in on SCLK's rising edge while CS is low; an 8-bit word configures NO0–NO7. On CS rising edge, the latch updates all switches simultaneously. DOUT outputs the first bit (D7) after 8 clocks, enabling cascaded control of multiple MAX349CWN+T devices with one MCU SPI port.
Does the MAX349CWN+T have built-in ESD protection?
Yes, the MAX349CWN+T provides >2kV ESD protection per Human Body Model (HBM) Method 3015.7 on all pins. This protection is integrated into the silicon process and requires no external components - enhancing robustness during handling, PCB assembly, and field operation in electrically noisy industrial environments.
What is the function of the RESET pin on the MAX349CWN+T?
The RESET pin on the MAX349CWN+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. This guarantees a known, safe default condition at power-up or after fault events, eliminating reliance on correct serial initialization sequence.
Can the MAX349CWN+T be used in bidirectional signal paths?
Yes, the MAX349CWN+T is fully bidirectional: COM and NOx pins are electrically identical and interchangeable. Signals pass with equal performance in either direction, and on-resistance, leakage, and capacitance specs apply symmetrically - enabling flexible use as input mux, output demux, or analog crosspoint switch in both acquisition and stimulus paths.
MAX349CWN+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Switch Circuit:
- -
- Multiplexer/Demultiplexer Circuit:
- -
- Number of Circuits:
- -
- On-State Resistance (Max):
- -
- Channel-to-Channel Matching (ΔRon):
- -
- Voltage - Supply, Single (V+):
- -
- Voltage - Supply, Dual (V±):
- -
- Switch Time (Ton, Toff) (Max):
- -
- -3db Bandwidth:
- -
- Charge Injection:
- -
- Channel Capacitance (CS(off), CD(off)):
- -
- Current - Leakage (IS(off)) (Max):
- -
- Crosstalk:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX349CWN+T FAQ
1.How can I place an order for MAX349CWN+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX349CWN+T 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 MAX349CWN+T reliable?
The price and inventory of MAX349CWN+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX349CWN+T is usually 5 days.
3.What payment methods are accepted for MAX349CWN+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX349CWN+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX349CWN+T?
MAX349CWN+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX349CWN+T 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 MAX349CWN+T?
For technical support, including MAX349CWN+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX349CWN+T requirements.
6.How does Aetrix verify that MAX349CWN+T is sourced from the original manufacturer or authorized distributors?
All MAX349CWN+T 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 MAX349CWN+T meets industry standards.
7.What is the process for return or replacement of MAX349CWN+T?
All MAX349CWN+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX349CWN+T, 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 MAX349CWN+T part is unused and in its original packaging.
Return procedure for MAX349CWN+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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