My Inquiry
My Account
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:4,850
Please send an inquiry. Send us your inquiry, and we will respond immediately.
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 ±2.7V to ±8V dual-supply or +2.7V to +16V single-supply operation - used in precision data-acquisition and industrial control signal routing.
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 wide supply flexibility across ±5V, +5V, and +3V configurations.
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 DIN, and DOUT enables cascading multiple devices without additional GPIO.
Its analog switch core uses CMOS transmission-gate topology with matched P/N channel sizing, enabling symmetric conduction, flat on-resistance (≤10Ω over ±3V signal range), and low charge injection (≤100pC) - critical for sampled-data systems requiring minimal settling error and THD preservation.
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 | ≤16Ω max between channels - maintains consistent channel-to-channel gain and offset in multi-channel acquisition. |
| Off-leakage current | ≤0.1nA at +25°C - preserves high-impedance sensor node integrity and long-time-constant integrator accuracy. |
| Supply range | ±2.7V to ±8V dual or +2.7V to +16V single - supports legacy ±5V, modern low-voltage +3.3V, and industrial +12V systems without level-shifting. |
| Turn-on/turn-off time | 400ns/300ns typical - enables fast multiplexing in high-throughput ADC sampling and real-time signal switching. |
| ESD protection | >2kV per Method 3015.7 - provides robust handling during board assembly and field service in industrial environments. |
| Logic compatibility | TTL/CMOS thresholds (0.8V/2.4V) at +5V or ±5V - eliminates need for external logic translators when interfacing with microcontrollers or FPGAs. |
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 | Synchronizes DIN data capture on rising edge; supports up to 2.1MHz operation - defines maximum multiplexing update rate. |
| 2 (V+) | Positive analog supply | Bias source for internal P-channel MOSFETs; sets upper rail for rail-to-rail analog signal range. |
| 3 (DIN) | Serial data input | Accepts 8-bit configuration word; MSB-first (D7→D0); enables single-wire programming of all 8 switches. |
| 4 (GND) | Digital ground reference | Reference for all digital inputs (CS, RESET, SCLK, DIN); isolated from analog signal path - prevents digital noise coupling. |
| 5 (COM) | Common analog terminal | Shared output node for all 8 SPST switches; bidirectional - may serve as input or output depending on system topology. |
| 6–13 (NO0–NO7) | Normally open analog terminals | Eight independent analog inputs/outputs; each connects to COM only when corresponding bit = 1 - enables flexible 8:1 mux or discrete switch array use. |
| 14 (N.C.) | No connect | Not internally bonded - must remain unconnected to avoid parasitic coupling or mechanical stress. |
| 15 (V−) | Negative analog supply | Bias source for internal N-channel MOSFETs; sets lower rail - enables true bipolar signal handling down to −8V. |
| 16 (DOUT) | Serial data output | Shift-register output delayed by 8 clocks; enables daisy-chaining of multiple MAX349CWN devices with single SCLK/CS/DIN bus. |
| 17 (RESET) | Asynchronous reset input | Active-low; forces all switches OFF and clears shift register - provides deterministic power-up or fault-recovery state. |
| 18 (CS) | Chip select input | Active-low; initiates data capture on falling edge and updates switch states on rising edge - defines transaction boundary for SPI-like interface. |
Key Features
| Feature | Design Value |
|---|---|
| 8 independently controllable SPST switches | Enables simultaneous or sequential routing of up to 8 analog signals to one common node - ideal for sensor multiplexing and test equipment channel expansion. |
| Rail-to-rail signal handling | Supports analog signals from V− to V+ without clipping - preserves full dynamic range of ±10V industrial sensors or audio line-level signals. |
| Daisy-chain serial interface | Single SCLK/CS/DIN bus controls multiple MAX349CWN units via DOUT cascade - reduces MCU GPIO count and simplifies PCB routing in multi-mux systems. |
| Break-before-make switching | Guaranteed 1–10ns delay prevents momentary shorting between channels - essential for avoiding cross-talk or supply rail contention in mixed-signal systems. |
| Asynchronous RESET | Hardware-initiated recovery to known OFF state - eliminates firmware dependency for safe shutdown or watchdog-triggered reinitialization. |
Applications
| Industrial Data Acquisition | Avionics Signal Routing |
|---|---|
Use Scenario: Multiplexing outputs from 8 RTD or thermocouple front-ends into a single precision ADC in a PLC I/O module. IC Role / Device Role / Timing Role: 8:1 analog multiplexer with low on-resistance and leakage - selects sensor channel under microcontroller SPI command before each ADC conversion cycle. Use Value: Enables cost-effective 8-channel measurement using one high-accuracy ADC instead of eight, while maintaining ≤0.1% gain error and <1µV offset drift across temperature. | Use Scenario: Routing analog navigation signals (VOR, ILS, ADF) between antenna inputs and receiver chains in a multi-band avionics transceiver. IC Role / Device Role / Timing Role: Bidirectional RF-adjacent analog switch array - isolates unused signal paths and minimizes insertion loss (<0.5dB) and crosstalk (>90dB) between bands. Use Value: Maintains signal fidelity across 10kHz–118MHz band with <−90dB channel-to-channel crosstalk and <100pC charge injection - preventing false lock or phase discontinuity. |
| ATE Channel Expansion | Audio Signal Switching |
Use Scenario: Adding 8 programmable analog test points to a boundary-scan-based functional tester for mixed-signal SoC validation. IC Role / Device Role / Timing Role: Precision analog switch matrix - routes stimulus signals or captures DUT responses under JTAG-controlled FPGA sequencing. Use Value: Delivers sub-100ns switching with guaranteed break-before-make, enabling glitch-free transitions during high-speed digital pattern generation and analog response capture. | Use Scenario: Selecting between 8 microphone preamp outputs for routing to a digital audio processor in a conferencing system. IC Role / Device Role / Timing Role: Low-distortion analog multiplexer - handles line-level (±2V) and mic-level (±10mV) signals with <0.01% THD+N across 20Hz–20kHz. Use Value: Preserves audio clarity with rail-to-rail swing, flat on-resistance (<10Ω variation), and <−90dB off-isolation - eliminating audible crosstalk or switching pop. |
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 with 4.5Ω on-resistance (at +5V), but only +1.8V to +5.5V single-supply operation - no dual-supply or ±3V capability. | Optimized for low-voltage portable instrumentation; lacks rail-to-rail support below +2.5V and cannot handle ±5V sensor signals directly. | Select ADG708BRUZ when ultra-low RON and low supply voltage dominate; avoid when bipolar signal range or industrial supply compatibility is required. |
| TMUX1308PWR | 8-channel mux with 120Ω on-resistance (typ), 1.08V to 5.5V supply, and integrated ESD (4kV HBM); no DOUT daisy-chain or RESET pin. | Designed for space-constrained consumer electronics; lacks asynchronous reset and serial cascade - requires separate GPIO per switch or I²C controller. | Select TMUX1308PWR for cost-sensitive, low-pin-count designs where SPI interface and hardware reset are unnecessary. |
Compared with ADG708BRUZ and TMUX1308PWR, the MAX349CWN uniquely combines wide dual/single-supply flexibility, hardware RESET, daisy-chain capability, and guaranteed break-before-make - making it the only choice for industrial and avionics systems requiring robust, deterministic, and scalable analog switching.
Availability
MAX349CWN is available at Aetrix Electronics and suitable for industrial data acquisition, avionics signal routing, and automated test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing from authorized channels.
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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing markets.
The MAX349CWN belongs to Maxim's precision analog switch/multiplexer product line, designed specifically for applications demanding low on-resistance, ultra-low leakage, wide supply range, and robust serial control in harsh or safety-critical environments.
FAQ
What is the maximum operating supply voltage for MAX349CWN?
The MAX349CWN supports dual supplies from ±2.7V to ±8V, or a single supply from +2.7V to +16V. Absolute maximum ratings allow V+ up to +17V and V− down to −17V, but sustained operation beyond ±8V or +16V is not specified and may compromise reliability or parametric performance. Always refer to the recommended operating conditions table in the official MAX349 datasheet for design margin.
Does MAX349CWN support daisy-chaining with other MAX349CWN devices?
Yes, the MAX349CWN supports daisy-chaining via its DOUT pin, which outputs the same data stream shifted by eight clocks. When multiple MAX349CWN units share CS and SCLK, and DIN of the first connects to DOUT of the previous, a single 8×N-bit serial word configures all N devices simultaneously upon CS rising edge - enabling scalable channel expansion without additional control lines.
What is the function of the RESET pin on MAX349CWN?
The RESET pin on MAX349CWN is an asynchronous active-low input that forces all eight analog switches to the OFF state and clears the internal 8-bit shift register to zero - regardless of CS or SCLK state. This provides deterministic initialization after power-up or fault recovery, eliminating reliance on software-controlled SPI sequences to guarantee a known safe state.
Can MAX349CWN operate with a +3.3V single supply?
Yes, the MAX349CWN operates with a +3.3V single supply (within the +2.7V to +16V range). At +3.3V, on-resistance increases to ~500Ω (typ), and timing parameters such as tON/tOFF scale accordingly. Logic thresholds remain compatible (0.8V/2.4V), and rail-to-rail analog range becomes 0V to +3.3V - suitable for low-voltage sensor interfaces where signal swing is constrained.
Is MAX349CWN pin-compatible with MAX349CPN or MAX349CAP?
No, MAX349CWN (18-pin Wide SO) is not pin-compatible with MAX349CPN (18-pin Plastic DIP) or MAX349CAP (20-pin SSOP). While all three share identical functionality and logic-level pin assignments (e.g., Pin 1 = SCLK, Pin 5 = COM), the physical pin counts and layouts differ: MAX349CAP has two extra N.C. pins (19–20), and MAX349CPN uses through-hole spacing. PCB layout must be redesigned for each package variant.
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.
MAX349CWN Tags
-
SN74LVC1G3157DBVR
Texas Instruments
-
SN74LVC1G66DBVR
Texas Instruments
-
SN74LVC1G66DCKR
Texas Instruments
-
SN74LVC1G3157DSFR
Texas Instruments
-
1P1G3157QDCKRQ1
Texas Instruments
-
SN74LVC2G66DCUR
Texas Instruments
-
SN74LV4052APWR
Texas Instruments
-
74HC4051D,653
Nexperia USA Inc.
-
SN74LV4051APWR
Texas Instruments
-
CD74HC4052PWR
Texas Instruments
-
CD74HC4051PWR
Texas Instruments
-
TS5A3166DBVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
