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Analog Devices Inc./Maxim Integrated MAX349CWN+
- Part No.:
- MAX349CWN+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 18-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX349CWN+.pdf
- Description:
- IC MUX 8:1 100OHM 18SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,612
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Product details
Overview
MAX349CWN+ 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 asynchronous RESET. It operates from ±2.7V to ±8V dual supplies or +2.7V to +16V single supply, and is used in serial data-acquisition systems requiring low-leakage, high-isolation switching.
For engineers reviewing the MAX349CWN+ datasheet, MAX349CWN+ pinout, MAX349CWN+ application, or MAX349CWN+ equivalent, key selection criteria include on-resistance matching (≤16Ω), off-leakage current (≤0.1nA at +25°C), break-before-make timing (1–10ns), daisy-chain capability via DOUT, and compatibility with TTL/CMOS logic at +5V or ±5V supplies.
Technical Context
The MAX349CWN+ 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 are independently controllable via a single 8-bit serial word, where D7 controls NO0 and D0 controls NO7.
It supports true bidirectional analog signal routing: COM and NO pins are functionally interchangeable, enabling flexible input/output assignment. The device features asynchronous RESET that forces all switches OFF and clears the shift register, ensuring deterministic power-up state without external initialization.
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 measurement paths |
| On-Resistance Match (∆RON) | 16Ω max - enables accurate channel-to-channel ratio matching in instrumentation and sensor multiplexing |
| Off-Leakage Current | 0.1nA max at +25°C - preserves signal integrity in high-impedance sensor interfaces and battery-powered systems |
| Supply Range | ±2.7V to ±8V dual or +2.7V to +16V single - supports wide-range industrial and avionics analog front-ends |
| Rail-to-Rail Signal Handling | VCOM/VNO = V− to V+ - allows full-swing analog signals without clipping across entire supply range |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire (DIN/SCLK/CS) with DOUT for daisy-chaining - reduces MCU GPIO count and simplifies multi-mux control |
| Break-Before-Make Delay | 1–10ns - prevents momentary short-circuit between channels during switching transitions |
Pinout & Package
MAX349CWN+ is housed in an 18-pin Wide SO (Small Outline) package with 0.3" body width and standard 1.27mm pitch. Pin 1 is marked by a beveled corner or dot; pin numbering follows standard SO convention (counterclockwise from top-left).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SCLK | Serial clock input | Edge-triggered synchronous input controlling data shift-in; rising edge clocks DIN into internal 8-bit register |
| 2 V+ | Positive analog supply | Accepts +2.7V to +16V (single) or +2.7V to +8V (dual); powers analog switch core and digital interface |
| 3 DIN | Serial data input | Accepts 8-bit configuration word; D7 first, D0 last; sampled on SCLK rising edge while CS is low |
| 4 GND | Digital ground reference | Reference for all digital inputs (CS, RESET, DIN, SCLK); analog signals referenced only to V+ and V− |
| 5 COM | Common analog terminal | Bidirectional mux output/input; connects to selected NOx channel; interchangeable with NO pins |
| 6–13 NO0–NO7 | Normally open analog terminals | Eight independent bidirectional analog inputs/outputs; each connects to COM when corresponding bit = 1 |
| 15 V− | Negative analog supply | Accepts −2.7V to −8V (dual) or 0V (single-supply mode); sets lower analog signal limit |
| 16 DOUT | Serial data output | Shift register Q8 output; enables daisy-chaining of multiple MAX349CWN+ devices with single SCLK/CS |
| 17 RESET | Asynchronous reset input | Active-low; forces all switches OFF and clears shift register to 00000000b regardless of clock state |
| 18 CS | Chip select input | Active-low; enables serial data loading while low; rising edge latches 8-bit word and updates switch states |
Key Features
| Feature | Design Value |
|---|---|
| 8 independently controllable SPST switches | Enables arbitrary channel selection patterns (e.g., multiple ON simultaneously) for flexible signal routing in test equipment |
| 100Ω on-resistance flatness ≤10Ω over signal range | Maintains consistent gain and linearity across full analog input span (e.g., ±3V), critical for precision ADC front-ends |
| 0.1nA max NO off-leakage at +25°C | Minimizes voltage error in high-Z sensor nodes (e.g., thermocouples, pH electrodes) and extends battery life |
| 2kV ESD protection (HBM) | Provides robust handling in manufacturing and field environments without external protection components |
| Daisy-chainable serial interface | Allows cascading of ≥2 MAX349CWN+ units using one MCU SPI port-reducing PCB routing and firmware complexity |
Applications
| Serial Data-Acquisition Systems | Industrial Process Control |
|---|---|
Use Scenario: Multiplexing 8 thermocouple or RTD inputs into a single precision ADC in a PLC analog input module. IC Role / Device Role / Timing Role: Bidirectional analog switch providing low-offset, low-leakage signal path selection under microcontroller serial control. Use Value: Enables high-channel-count, low-cost data acquisition with <0.1nA leakage preserving µV-level thermocouple accuracy. | Use Scenario: Routing analog sensor outputs (pressure, flow, level) to redundant controllers in safety-critical plant automation. IC Role / Device Role / Timing Role: Fault-tolerant analog multiplexer with asynchronous RESET for fail-safe channel isolation. Use Value: Guarantees known OFF state at power-up or fault condition, preventing unintended signal coupling between control loops. |
| Avionics Signal Management | ATE Equipment Channel Switching |
Use Scenario: Selecting between flight-critical sensor sources (airspeed, altitude, attitude) for health monitoring in FDR or CMS systems. IC Role / Device Role / Timing Role: High-reliability analog switch with rail-to-rail operation supporting ±5V avionics supply standards. Use Value: Delivers >90dB off-isolation and <−90dB crosstalk to prevent interference between safety-critical sensor channels. | Use Scenario: Dynamic reconfiguration of DUT signal paths (analog stimulus/response, power sequencing) in automated test handlers. IC Role / Device Role / Timing Role: Fast-switching (tON/tOFF ≤400ns), low-charge-injection (≤100pC) multiplexer controlled via embedded controller SPI bus. Use Value: Reduces test time through deterministic sub-µs switching and eliminates settling errors in high-speed parametric measurements. |
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; 4.5Ω typical RON (±5V); SPI interface not supported-requires parallel address lines | Lower on-resistance but higher pin count (16-pin TSSOP); no daisy-chain capability | Prefer ADG708BRUZ for ultra-low RON in space-constrained layouts where parallel control is acceptable |
| TMUX1308PWR | 8-channel mux with I²C interface; 5.5Ω typical RON; no RESET pin; 1.08–5.5V supply only | I²C simplifies MCU integration but lacks asynchronous reset and dual-supply support | Choose TMUX1308PWR for low-voltage, I²C-based systems where ± supplies and deterministic reset are not required |
Compared with ADG708BRUZ and TMUX1308PWR, the MAX349CWN+ uniquely combines SPI daisy-chaining, ±8V dual-supply operation, and hardware RESET-making it optimal for industrial and avionics multiplexers requiring robust, scalable, and fail-safe serial control.
Availability
MAX349CWN+ is available at Aetrix Electronics and suitable for serial data-acquisition systems, industrial process-control modules, and avionics signal management requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for MAX349CWN+ 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+ belongs to Maxim's serially controlled analog switch/multiplexer product line, engineered for high-channel-count, low-leakage, and SPI-managed signal routing in harsh-environment data acquisition and control systems.
FAQ
What is the maximum operating supply voltage for MAX349CWN+ in dual-supply mode?
The MAX349CWN+ supports dual-supply operation from ±2.7V to ±8V. Absolute maximum ratings allow V+ up to +17V and V− down to −17V, but functional operation is specified only within ±2.7V to ±8V. Exceeding ±8V may degrade on-resistance matching and increase leakage beyond datasheet limits. Always refer to the MAX349CWN+ absolute maximum ratings table for safe design margins.
Does MAX349CWN+ support daisy-chaining, and how is it implemented?
Yes, MAX349CWN+ supports daisy-chaining via its DOUT pin. When CS is low, DOUT outputs the bit shifted out of the 8-bit register (Q8), allowing serial data to cascade from one MAX349CWN+ to the next. All devices share common SCLK and CS lines; DIN of device N+1 connects to DOUT of device N. On CS rising edge, all chained devices update simultaneously-enabling synchronized switching across multiple 8-channel banks using a single SPI interface.
What is the purpose of the RESET pin on MAX349CWN+, and is it necessary to use it?
The RESET pin on MAX349CWN+ is an asynchronous active-low input that forces all eight switches OFF and clears the internal shift register to 00000000b, regardless of SCLK or CS state. While not mandatory for basic operation (power-up defaults to all OFF), RESET is essential for fail-safe recovery after communication errors, brown-out events, or system resets-ensuring deterministic channel isolation without requiring full SPI reinitialization. It is recommended for safety-critical applications.
Can MAX349CWN+ handle bipolar analog signals, and what is its signal range with ±5V supplies?
Yes, MAX349CWN+ fully supports bipolar analog signals. With ±5V supplies (V+ = +5V, V− = −5V), the analog signal range is V− to V+, i.e., −5V to +5V at both COM and NO pins. This rail-to-rail capability allows undistorted passage of AC-coupled or DC-biased signals spanning the full supply range-critical for audio routing, sensor conditioning, and avionics interface where negative voltages are common.
How does the on-resistance flatness specification affect precision measurement applications using MAX349CWN+?
The MAX349CWN+ guarantees ≤10Ω on-resistance flatness (RFLAT(ON)) over the specified analog signal range (e.g., ±3V at ±5V supplies). This means RON varies by no more than 10Ω as the signal voltage changes-directly limiting gain nonlinearity and channel-to-channel mismatch in ratiometric measurements (e.g., bridge sensors with ADC references). In a 12-bit system with 1kΩ source impedance, this flatness contributes <0.01% of full-scale error, preserving measurement fidelity without calibration per channel.
MAX349CWN+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-SOIC
MAX349CWN+ FAQ
1.How can I place an order for MAX349CWN+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX349CWN+ 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+ reliable?
The price and inventory of MAX349CWN+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX349CWN+ is usually 5 days.
3.What payment methods are accepted for MAX349CWN+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX349CWN+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX349CWN+?
MAX349CWN+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX349CWN+ 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+?
For technical support, including MAX349CWN+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX349CWN+ requirements.
6.How does Aetrix verify that MAX349CWN+ is sourced from the original manufacturer or authorized distributors?
All MAX349CWN+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX349CWN+?
All MAX349CWN+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX349CWN+, 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+ part is unused and in its original packaging.
Return procedure for MAX349CWN+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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