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Analog Devices Inc./Maxim Integrated MAX349CPN+
- Part No.:
- MAX349CPN+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 18-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX349CPN+.pdf
- Description:
- IC MUX 8:1 100OHM 18DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,058
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Product details
Overview
MAX349CPN+ 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 or +2.7V to +16V single supply operation. It serves as a programmable 8:1 analog switch in data-acquisition front-ends where low leakage (0.1nA @ +25°C) and matched channel resistance are critical.
For engineers reviewing the MAX349CPN+ datasheet, MAX349CPN+ pinout, MAX349CPN+ application, or MAX349CPN+ equivalent, key selection criteria include its 8-bit shift-register control architecture, daisy-chain capability via DOUT, asynchronous RESET, TTL/CMOS-compatible logic thresholds, and guaranteed on-resistance flatness (10Ω max over ±3V signal range).
Technical Context
The MAX349CPN+ implements an 8-bit serial shift register that updates all eight SPST switches synchronously on the rising edge of CS, independent of SCLK state-ensuring full SPI/QSPI compliance with CPOL = 0. Its analog path supports bidirectional rail-to-rail signals across V− to V+, with no ground reference required for analog signals.
Switch control is fully decoupled from digital timing: DIN data is clocked in on SCLK rising edges while CS is low; configuration latching occurs only at CS rising edge. The device features asynchronous RESET that forces all switches OFF and clears the shift register, enabling deterministic power-up behavior and safe reconfiguration.
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 analog paths |
| On-Resistance Match (∆RON) | 16Ω max between channels - enables accurate channel-to-channel signal ratio matching in multi-input systems |
| On-Resistance Flatness (RFLAT) | 10Ω max over ±3V signal range - maintains consistent gain and linearity across full analog input swing |
| NO Off-Leakage Current | 0.1nA max at +25°C - preserves high-impedance sensor node integrity and prevents DC error accumulation |
| Supply Range | ±2.7V to ±8V dual or +2.7V to +16V single - supports wide-range industrial, automotive, and battery-powered designs |
| Logic Thresholds | VIL = 0.8V, VIH = 2.4V - guarantees interoperability with both TTL and CMOS logic without level-shifting |
| Turn-On Time (tON) | 400ns max - enables fast channel switching in real-time signal routing and ATE applications |
Pinout & Package
MAX349CPN+ is housed in an 18-pin plastic DIP package (0.300" width), with pins arranged in two rows. Pin 1 is CS (chip select), pin 18 is CS (chip select), and pin 14 is N.C. (not internally connected). All analog NO/COM pins are bidirectional and interchangeable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 18 | CS | Active-low chip-select input; rising edge latches 8-bit shift register and updates all switch states |
| 2 | V+ | Positive analog supply; must be ≥ +2.7V (single) or ≥ ±2.7V (dual); powers analog and digital sections |
| 3 | DIN | Serial data input; accepts 8-bit word MSB-first; sampled on SCLK rising edge when CS is low |
| 4 | GND | Digital ground reference; analog signals referenced only to V+ and V−, not GND |
| 5 | COM | Common analog terminal; bidirectional; functions as mux output or shared input for all NO channels |
| 6–13 | NO0–NO7 | Normally open analog terminals; bidirectional; each connects to COM when corresponding bit = 1 |
| 14 | N.C. | No internal connection; must be left unconnected |
| 15 | V− | Negative analog supply; tied to GND for single-supply operation; defines lower analog signal limit |
| 16 | DOUT | Serial data output; provides daisy-chain capability; outputs delayed DIN data (8 clocks later) |
| 17 | RESET | Asynchronous active-low reset; forces all switches OFF and clears shift register to 00000000 |
| 18 | SCLK | Serial clock input; rising edge clocks DIN data into shift register; hysteresis >100mV improves noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| 8-bit serial shift register | Enables microcontroller-based control with only 3 I/O lines (DIN, SCLK, CS), reducing GPIO count and PCB routing complexity |
| Daisy-chain capability | DOUT output allows cascading multiple MAX349CPN+ devices under one CS line, simplifying expansion of channel count without added control lines |
| Rail-to-rail analog signal handling | Supports input/output signals from V− to V+ without clipping, eliminating need for external level-shifting in ±5V or +12V systems |
| Break-before-make switching | Guaranteed 2ns minimum delay prevents momentary shorting between channels during reconfiguration, protecting sensitive sources |
| 2kV ESD protection | Per Method 3015.7 - enhances robustness in handling and board-level environments without external protection components |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Multiplexing thermocouple, RTD, and strain gauge outputs from 8 sensor nodes into a single ADC channel in PLC-based monitoring systems. IC Role / Device Role / Timing Role: 8:1 analog multiplexer providing low-leakage, low-on-resistance signal routing with deterministic channel update timing via CS edge. Use Value: Enables high-accuracy DC measurements by minimizing RON mismatch-induced gain errors and preserving sensor source impedance integrity. | Use Scenario: Routing calibrated reference voltages and DUT signals to precision measurement instruments in semiconductor test handlers. IC Role / Device Role / Timing Role: Fast-switching, rail-to-rail analog mux synchronized to test controller's CS strobe for sub-microsecond channel reconfiguration. Use Value: Achieves <400ns turn-on time and >90dB off-isolation to prevent crosstalk between high-precision stimulus and measurement paths. |
| Avionics Signal Management | Audio Signal Routing |
Use Scenario: Selecting among redundant flight sensor inputs (airspeed, altitude, attitude) for fault-tolerant data acquisition in cockpit display units. IC Role / Device Role / Timing Role: Bidirectional, fail-safe analog switch with asynchronous RESET ensuring known-off state after power cycle or fault recovery. Use Value: Supports dual ±5V supply operation and meets MIL-STD-704 voltage tolerance requirements while maintaining <0.1nA leakage at +25°C. | Use Scenario: Dynamically routing line-level audio signals between microphone preamps, DSP inputs, and output amplifiers in professional mixing consoles. IC Role / Device Role / Timing Role: Low-distortion, low-charge-injection analog switch enabling glitch-free channel switching during live audio performance. Use Value: Delivers <1pC charge injection and >90dB channel-to-channel crosstalk, preventing audible pops or signal corruption during real-time routing. |
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, SPI-controlled, but requires separate VDD/VSS and logic supply; 4.5Ω typical RON vs. 100Ω max for MAX349CPN+ | Optimized for low-RON, low-voltage (≤5.5V) portable applications; lacks dual-supply flexibility and rail-to-rail beyond supply rails | Select ADG708BRUZ when ultra-low on-resistance and low supply current (<1µA) are prioritized over wide supply range and bipolar signal support. |
| TMUX1308PWR | 8-channel, parallel-controlled (3 address lines), no serial interface; 4.5Ω typical RON; supports 1.08V–5.5V supply only | Designed for space-constrained, low-pin-count MCU interfaces; no daisy-chaining or shift-register flexibility | Select TMUX1308PWR when simple address decoding suffices and serial bus overhead must be avoided, accepting loss of remote configurability. |
Compared with ADG708BRUZ and TMUX1308PWR, the MAX349CPN+ uniquely combines wide dual/single supply operation (±2.7V to ±8V or +2.7V to +16V), true rail-to-rail analog signaling, and SPI-compatible daisy-chain capability-making it optimal for industrial, avionics, and ATE systems requiring robust, flexible, and scalable analog switching.
Availability
MAX349CPN+ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, avionics signal management, and professional audio routing requiring stable component supply and long-term manufacturability.
Supply support for MAX349CPN+ 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.
The MAX349CPN+ belongs to Maxim's precision analog multiplexer product line, designed specifically for applications demanding low leakage, matched on-resistance, and robust serial control in harsh or wide-supply environments.
FAQ
What is the maximum allowable analog signal range for MAX349CPN+ when operated with ±5V supplies?
The MAX349CPN+ supports rail-to-rail analog signals from V− to V+, meaning −5V to +5V with ±5V supplies. This is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, where VCOM/VNO is specified as (V− − 2V) to (V+ + 2V) for safe operation, but functional analog range is strictly V− to V+ under normal conditions.
Does MAX349CPN+ support daisy-chaining with other MAX349CPN+ devices, and how is it implemented?
Yes, MAX349CPN+ supports daisy-chaining via its DOUT pin. When multiple devices share a common CS line, DIN data is shifted through the first device's DOUT into the next device's DIN. On the rising edge of CS, all shift registers latch simultaneously, updating all switches in lockstep-enabling scalable channel expansion without additional control lines.
What is the function of the RESET pin on MAX349CPN+, and does it affect the serial interface state?
The RESET pin on MAX349CPN+ is an asynchronous active-low input that forces all eight switches to the OFF state and resets the internal 8-bit shift register to 00000000. It does not interfere with ongoing serial communication but overrides all prior configurations, ensuring a known, safe state after power-up or fault recovery.
Can MAX349CPN+ operate with a single +3.3V supply, and what are the key performance trade-offs?
Yes, MAX349CPN+ operates with a single +3.3V supply (within +3.0V to +3.6V range). At this voltage, typical on-resistance increases to ~600Ω (vs. 100Ω at ±5V), and turn-on time extends to ~700ns. However, logic thresholds remain compatible (VIL = 0.8V, VIH = 2.4V), and leakage stays below 0.1nA at +25°C-preserving suitability for low-power, battery-operated systems.
How does the MAX349CPN+ ensure break-before-make switching, and is it guaranteed across temperature?
The MAX349CPN+ guarantees a minimum 2ns break-before-make delay (tBBM) between switch transitions, measured from the rising edge of CS. This parameter is tested and specified across the full operating temperature range (0°C to +70°C for MAX349CPN+), ensuring reliable channel isolation even under thermal stress and preventing momentary shorts in multi-source systems.
MAX349CPN+ 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 18-PDIP
MAX349CPN+ FAQ
1.How can I place an order for MAX349CPN+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX349CPN+ 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 MAX349CPN+ reliable?
The price and inventory of MAX349CPN+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX349CPN+ is usually 5 days.
3.What payment methods are accepted for MAX349CPN+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX349CPN+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX349CPN+?
MAX349CPN+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX349CPN+ 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 MAX349CPN+?
For technical support, including MAX349CPN+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX349CPN+ requirements.
6.How does Aetrix verify that MAX349CPN+ is sourced from the original manufacturer or authorized distributors?
All MAX349CPN+ 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 MAX349CPN+ meets industry standards.
7.What is the process for return or replacement of MAX349CPN+?
All MAX349CPN+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX349CPN+, 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 MAX349CPN+ part is unused and in its original packaging.
Return procedure for MAX349CPN+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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