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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:4,916
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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), ±2.7V to ±8V dual or +2.7V to +16V single supply operation, and rail-to-rail signal handling - used in industrial data-acquisition systems for routing multiple sensor signals to a shared ADC.
For engineers reviewing the MAX349EWN datasheet, MAX349EWN pinout, MAX349EWN application, or MAX349EWN equivalent, key selection criteria include its 8-bit shift-register control architecture, -40°C to +85°C extended temperature rating, 0.1nA off-leakage at +25°C, and daisy-chain capability for multi-mux configurations without additional GPIO overhead.
Technical Context
The MAX349EWN implements an 8-bit serial shift register that updates all eight SPST switches simultaneously on the rising edge of CS; DIN data is clocked in on SCLK rising edges, and DOUT provides cascaded output for daisy-chaining. Its analog path supports bidirectional rail-to-rail signals across the full supply range.
Switch control is fully asynchronous to analog signal timing: turn-on time is 400ns (typ), turn-off time is 300ns (typ), and break-before-make delay is only 2ns (typ), ensuring minimal transient coupling during channel switching in precision measurement paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| On-resistance (RON) | 100Ω max at ±5V supplies - ensures low insertion loss and minimal gain error in precision signal chains. |
| On-resistance match | 16Ω max between channels - enables accurate ratiometric measurements across multiple muxed inputs. |
| Off-leakage current | 0.1nA at +25°C - preserves high-impedance sensor node integrity and reduces offset drift in µV-level systems. |
| Supply range | ±2.7V to ±8V dual or +2.7V to +16V single - supports legacy ±5V, modern low-voltage, and wide-range industrial rails. |
| Operating temperature | -40°C to +85°C - qualified for extended industrial environments including factory automation and avionics subsystems. |
| Serial interface | SPI/QSPI/MICROWIRE-compatible 3-wire (DIN/SCLK/CS) with DOUT - enables direct connection to microcontroller SPI peripherals without protocol translation. |
| ESD protection | >2kV per Method 3015.7 - enhances robustness in handling-sensitive production and field-repair scenarios. |
Pinout & Package
MAX349EWN is housed in an 18-pin Wide SO (SOIC-W) package with 0.3" body width and standard 1.27mm pitch. Pin 1 is CS (Chip Select), pin 18 is DOUT, and pins 6–13 are NO0–NO7 (normally open switch terminals). COM (pin 5) serves as the common analog terminal.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CS (Pin 18) | Chip-select input | Active-low latch enable: rising edge commits shift-register contents to analog switches; required for synchronous update. |
| COM (Pin 5) | Common analog node | Bidirectional mux output/input; connects to ADC input or shared signal bus; interchangeable with NO pins. |
| NO0–NO7 (Pins 6–13) | Normally open analog inputs | Eight independent bidirectional analog terminals; each controlled by one bit of the 8-bit shift register. |
| DIN (Pin 3) | Serial data input | Accepts 8-bit control word MSB-first; sampled on SCLK rising edge while CS is low. |
| SCLK (Pin 1) | Serial clock input | Drives internal shift register; compatible with standard SPI clock polarity/phase (CPOL=0, CPHA=0). |
| DOUT (Pin 16) | Serial data output | Shift-register Q8 output; enables daisy-chaining multiple MAX349EWN devices with single MCU SPI port. |
| RESET (Pin 17) | Asynchronous reset | Drives all switches OFF and clears shift register to 00000000; no clock or CS dependency. |
| V+ (Pin 2), V− (Pin 15) | Analog supply rails | Support dual ±2.7V to ±8V or single +2.7V to +16V operation; define analog signal range boundaries. |
Key Features
| Feature | Design Value |
|---|---|
| 8 independently controllable SPST switches | Enables flexible 8:1 multiplexing or arbitrary subset routing (e.g., 3-channel + 5-channel groups) without hardware reconfiguration. |
| Rail-to-rail analog signal handling | Supports full-scale signals from V− to V+, eliminating level-shifting requirements for ±10V industrial sensors or audio line-level signals. |
| 8-bit daisy-chainable serial interface | Reduces MCU GPIO count: one SPI port controls up to N devices using only 3 wires (shared SCLK/CS/DIN) plus N DOUT returns. |
| Asynchronous RESET input | Guarantees known safe state (all switches open) at power-up or fault recovery, independent of clock or serial timing. |
| Matched on-resistance flatness | 10Ω max variation over signal range - maintains consistent channel gain and minimizes THD in AC-coupled audio or sensor applications. |
Applications
| Industrial Data-Acquisition Systems | Avionics Signal Routing |
|---|---|
Use Scenario: Multiplexing 8 thermocouple or RTD sensor outputs into a single high-resolution ADC in a PLC rack or environmental monitor. IC Role / Device Role / Timing Role: Analog front-end multiplexer providing channel selection under firmware control via SPI, with sub-500ns switching for rapid scan sequences. Use Value: Eliminates need for discrete relays or parallel GPIO-controlled analog switches, reducing BOM cost and PCB area while maintaining <0.01% gain error across channels. | Use Scenario: Routing redundant flight-control sensor signals (e.g., airspeed, angle-of-attack) to dual-channel monitoring units in certified avionics hardware. IC Role / Device Role / Timing Role: Fault-tolerant analog switch enabling automatic failover between primary and backup sensor paths via watchdog-triggered RESET assertion. Use Value: -40°C to +85°C rating and >2kV ESD ensure reliable operation in vibration-prone, temperature-cycled aircraft bays without derating. |
| ATE Equipment Channel Selection | Audio Signal Routing |
Use Scenario: Configuring stimulus/response paths in automated test equipment for mixed-signal IC characterization, where 8 DUT pins connect to shared VI sources. IC Role / Device Role / Timing Role: Precision analog switch matrix with 100Ω RON and <10Ω matching, controlled via high-speed SPI for sub-millisecond test sequence reconfiguration. Use Value: Low charge injection (≤100pC) and high off-isolation (>90dB) prevent crosstalk and settling errors during fast-switching parametric tests. | Use Scenario: Implementing programmable input selection in professional audio mixers or studio interfaces, routing mic/line/instrument sources to DSP processing blocks. IC Role / Device Role / Timing Role: Bidirectional audio-path switch supporting DC-coupled or AC-coupled signals up to 20kHz with <0.001% THD+N at 1VRMS. Use Value: Rail-to-rail operation handles ±12V pro-audio levels directly; 0.1nA leakage prevents capacitor discharge in high-Z passive summing nodes. |
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, 3.3V/5V single-supply only, 4.5Ω typical RON, no daisy-chain DOUT, -40°C to +85°C. | Lacks dual-supply support and serial daisy-chaining; suited for low-RON, low-voltage digital-centric systems only. | Select when ultra-low on-resistance and minimal supply complexity outweigh need for ± supplies or multi-device synchronization. |
| TMUX1308PWR | 8-channel mux with I²C interface, 1.8V–5.5V supply, 5.5Ω typical RON, no RESET pin, -40°C to +125°C. | I²C control replaces SPI; no hardware reset; higher temp grade but incompatible serial protocol and missing daisy-chain capability. | Choose for I²C-based microcontrollers where pin count is constrained and extended temperature is critical, accepting protocol redesign. |
Compared with ADG708BRUZ and TMUX1308PWR, the MAX349EWN uniquely combines dual-supply flexibility, hardware RESET, and daisy-chainable SPI - making it optimal for industrial and avionics systems requiring robust, scalable, and supply-agile analog routing.
Availability
MAX349EWN is available at Aetrix Electronics and suitable for industrial data-acquisition systems, avionics signal routing, and ATE equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
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 precision analog, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing applications.
The MAX349EWN belongs to Maxim's serially controlled analog switch/multiplexer product line, engineered for high-reliability, low-leakage, and flexible supply operation in demanding measurement and control systems.
FAQ
What is the maximum supply voltage range supported by the MAX349EWN?
The MAX349EWN supports dual supplies from ±2.7V to ±8V or a single supply from +2.7V to +16V. This wide operating range allows direct interfacing with legacy ±5V industrial systems, modern low-voltage microcontrollers, and high-voltage sensor conditioning circuits - all without external level-shifting components. The absolute maximum ratings specify V+ to -0.3V/+17V and V− to -17V/+0.3V, but sustained operation must remain within the specified functional ranges to ensure reliability and parameter compliance.
Does the MAX349EWN support daisy-chaining with other identical devices?
Yes, the MAX349EWN supports daisy-chaining via its DOUT pin (Pin 16), which outputs the eighth bit of the internal 8-bit shift register. By connecting DOUT of one MAX349EWN to DIN of the next, and tying all CS pins together, a single SPI port can configure multiple devices in series. When CS rises, all chained devices update their switch states simultaneously - enabling synchronized channel selection across large analog input arrays without additional address decoding logic.
What is the guaranteed on-resistance matching between channels in the MAX349EWN?
The MAX349EWN guarantees on-resistance matching of ≤16Ω maximum between any two channels (ΔRON = RONmax − RONmin) under specified conditions (V+ = +5V, V− = −5V, VCOM = ±3V, INO = 1mA, TA = +25°C). This tight matching ensures consistent gain and minimal channel-to-channel error in ratiometric measurements, such as those used in bridge sensor readouts or multi-channel thermistor networks where relative accuracy matters more than absolute RON value.
How does the RESET pin function on the MAX349EWN?
The RESET pin (Pin 17) provides asynchronous, hardware-level initialization: driving it low forces all eight switches to the OFF state and resets the internal 8-bit shift register to 00000000, regardless of SCLK or CS state. This ensures deterministic startup behavior and safe fault recovery - critical in safety-critical systems like avionics or medical instrumentation where undefined analog paths could cause hazardous conditions. The pin is active-low and TTL/CMOS-compatible when operated with ±5V or +5V supplies.
Is the MAX349EWN pin-compatible with other variants in the MAX349/MAX350 family?
No - the MAX349EWN is not pin-compatible with MAX350 variants (e.g., MAX350EWN), which feature dual 4-to-1 mux topology and different pin assignments for COMA/COMB and NOxA/NOxB terminals. Within the MAX349 family, MAX349EWN shares the same 18-pin Wide SO footprint and pinout as MAX349CWN and MAX349CPN, differing only in temperature grade (−40°C to +85°C vs. 0°C to +70°C) and internal screening - making it a direct drop-in replacement for C-grade versions in extended-temperature applications.
MAX349EWN 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:
- -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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