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Analog Devices Inc./Maxim Integrated MAX349EPN
- Part No.:
- MAX349EPN
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 18-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX349EPN.pdf
- Description:
- IC MUX 8:1 100OHM 18DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,833
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Product details
Overview
MAX349EPN 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 process control data-acquisition systems requiring low-leakage, high-isolation switching.
For engineers reviewing the MAX349EPN datasheet, MAX349EPN pinout, MAX349EPN application, or MAX349EPN equivalent, this page delivers verified electrical specs, daisy-chainable serial timing, -40°C to +85°C extended temperature operation, and precise switch-level design guidance for analog signal routing in ATE and avionics.
Technical Context
The MAX349EPN implements an 8-bit shift register architecture synchronized to SCLK's rising edge, with CS-controlled 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 without additional logic.
It supports true bidirectional analog conduction: COM and NO pins are functionally interchangeable, enabling flexible signal path design. Switch states persist until updated by new serial data, and power-up defaults all channels OFF with shift register reset to zero - ensuring deterministic startup behavior in safety-critical systems.
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 between channels - critical for matched-gain applications like differential sensor multiplexing. |
| Off-Leakage Current | 0.1nA at +25°C, 5nA at +85°C - preserves accuracy in high-impedance sensor front-ends and battery-powered systems. |
| Analog Signal Range | Rail-to-rail: (V− − 2V) to (V+ + 2V) - supports full dynamic range signal routing across ±5V, ±3V, or +5V/0V supplies. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire interface (DIN/SCLK/CS) with DOUT for daisy-chaining - reduces MCU GPIO count and simplifies multi-mux control. |
| Operating Temperature | -40°C to +85°C (E-grade) - qualified for industrial and avionics environments where thermal stability is mandatory. |
| ESD Protection | >2kV per Method 3015.7 - enhances robustness during board handling and system integration. |
Pinout & Package
MAX349EPN is supplied in an 18-pin plastic DIP package (0.3-inch width), with through-hole mounting and industry-standard pin spacing. Pin 14 is N.C. (not internally connected); all other pins match the functional diagram in the MAX349 datasheet Rev 1 (10/98).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SCLK | Serial clock input | Synchronizes DIN data capture on rising edge; controls internal shift register timing and DOUT output delay. |
| 2 V+ | Positive analog supply | Accepts +2.7V to +16V (single) or ±2.7V to ±8V (dual); powers analog switches and digital interface logic. |
| 3 DIN | Serial data input | Accepts 8-bit configuration word; D7 is MSB and first bit shifted in; latched on CS rising edge. |
| 4 GND | Digital ground reference | Reference for digital inputs only; analog signals float between V+ and V− with no GND dependency. |
| 5 COM | Common analog terminal | Bidirectional mux output/input; connects to any 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 | Required for dual-supply operation (±2.7V to ±8V); tied to GND for single-supply (+2.7V to +16V) mode. |
| 16 DOUT | Serial data output | Shift register output; data appears on falling SCLK edge; enables cascading up to N devices with one MCU SPI port. |
| 17 RESET | Asynchronous reset input | Drives all switches OFF and clears shift register to zero regardless of CS/SCLK state - hard failsafe control. |
| 18 CS | Chip select input | Active-low; enables serial data loading while low; rising edge updates switch states and freezes configuration. |
Key Features
| Feature | Design Value |
|---|---|
| 8 independently controllable SPST switches | Enables arbitrary channel selection (0–8 channels simultaneously active), supporting flexible signal routing beyond standard 8:1 mux behavior. |
| Rail-to-Rail® analog signal handling | Supports full-scale signals from V− −2V to V+ +2V - eliminates level-shifting requirements in mixed-supply systems. |
| Asynchronous RESET input | Guarantees known OFF state on power-up or fault recovery without relying on serial bus availability or timing. |
| Daisy-chainable DOUT | Allows stacking multiple MAX349EPN devices using a single 3-wire SPI bus - reduces MCU pin count and PCB routing complexity. |
| TTL/CMOS-compatible logic thresholds | 0.8V/2.4V thresholds ensure reliable interfacing with both 3.3V and 5V microcontrollers without external level shifters. |
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: Bidirectional analog switch array managing high-impedance, low-level analog inputs with sub-nA leakage and matched RON for ratio-metric accuracy. Use Value: Eliminates need for external buffer amplifiers per channel due to rail-to-rail support and <100Ω on-resistance, reducing BOM cost and board area. | Use Scenario: Routing calibration reference voltages and DUT signals across multiple test fixtures in semiconductor wafer probers. IC Role / Device Role / Timing Role: Precision analog switch providing >90dB off-isolation and <400ns turn-on time to minimize test cycle overhead and crosstalk-induced measurement errors. Use Value: Enables fast, repeatable channel switching under software control - critical for high-throughput parametric testing with minimal settling delay. |
| Avionics Sensor Interface | Audio Signal Routing |
Use Scenario: Consolidating air data, inertial, and environmental sensor signals onto shared ARINC 429 or MIL-STD-1553 data acquisition buses. IC Role / Device Role / Timing Role: Extended temperature (-40°C to +85°C) analog multiplexer with >2kV ESD protection for harsh aircraft cabin and avionics bay environments. Use Value: Meets DO-160 Section 22 lightning-induced transient requirements without external protection circuitry, simplifying certification. | Use Scenario: Dynamic reconfiguration of microphone preamp outputs and speaker driver inputs in professional audio mixing consoles. IC Role / Device Role / Timing Role: Low-distortion, bidirectional analog switch supporting 20Hz–20kHz audio bandwidth with <0.01% THD at 1VRMS. Use Value: Maintains signal integrity across gain stages and routing paths without DC blocking capacitors - preserving low-frequency response and phase coherence. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG1408BRUZ | 8-channel, ±15V max supply, 4.7Ω typical RON, SPI-compatible but requires external VDRIVE pin for logic level translation. | Higher precision, lower RON, but lacks integrated logic-level compatibility and daisy-chain DOUT. | Select ADG1408BRUZ when ultra-low on-resistance and higher voltage swing (>±8V) are required; accept added level-shifting complexity. |
| TMUX1308PWR | 8-channel, single 1.8V–5.5V supply only, 5.5Ω typical RON, I²C interface (no SPI/DOUT), no extended temperature grade. | Lower power, smaller package (TSSOP-16), but limited to commercial temp range and incompatible serial protocol. | Select TMUX1308PWR for cost-sensitive, space-constrained consumer designs operating strictly at +25°C with I²C host control. |
Compared with ADG1408BRUZ and TMUX1308PWR, the MAX349EPN uniquely combines extended temperature operation (-40°C to +85°C), integrated SPI daisy-chaining, rail-to-rail analog range, and TTL/CMOS logic compatibility - making it optimal for industrial and avionics signal routing where reliability, flexibility, and bus efficiency are prioritized over minimum RON.
Availability
MAX349EPN is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment (ATE), and avionics sensor interface applications requiring stable component supply, long-term lifecycle support, and guaranteed extended-temperature performance.
Supply support for MAX349EPN 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 markets.
The MAX349EPN belongs to Maxim's serially controlled analog switch/multiplexer product line, engineered for high-reliability signal routing in systems demanding low leakage, wide supply range, and deterministic digital control - especially where SPI bus efficiency and extended temperature operation are essential.
FAQ
What is the maximum supply voltage range supported by the MAX349EPN?
The MAX349EPN 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 continuous operation must stay within the specified ranges to ensure reliability and parameter compliance. The MAX349EPN maintains rail-to-rail analog signal handling across these configurations.
Does the MAX349EPN support daisy-chaining with other MAX349EPN devices?
Yes, the MAX349EPN supports daisy-chaining via its DOUT pin, which outputs the same serial data stream delayed by eight clock cycles. By connecting DOUT of one MAX349EPN to DIN of the next and tying all CS pins together, a single SPI master can configure multiple MAX349EPN devices in series - eliminating address decoding logic and simplifying firmware.
What is the on-resistance flatness specification for the MAX349EPN, and why does it matter?
The MAX349EPN guarantees ≤10Ω on-resistance flatness over the specified analog signal range (±3V at ±5V supplies). This means RON varies by no more than 10Ω as the signal voltage sweeps across the range - critical for minimizing harmonic distortion and gain nonlinearity in AC-coupled or precision DC measurement paths where consistent channel impedance is required.
How does the RESET pin function on the MAX349EPN, and is it necessary to use it?
The RESET pin on the MAX349EPN is asynchronous and forces all eight switches OFF and clears the internal shift register to zero, regardless of CS or SCLK state. While not mandatory for basic operation (power-up defaults achieve the same), it provides deterministic fail-safe recovery during brownout, watchdog timeout, or system-level fault conditions - making it essential in safety-critical industrial and avionics designs.
Can the MAX349EPN operate with a +3.3V-only supply, and what performance trade-offs occur?
Yes, the MAX349EPN operates with a +3.3V single supply (V+ = 3.3V, V− = 0V), though RON increases to ~270Ω (typical) versus 100Ω at ±5V. Off-leakage remains ≤0.1nA at +25°C, and logic thresholds remain compatible. However, analog signal range shrinks to 0V–3.3V, and timing parameters like tON/tOFF increase slightly - acceptable for low-speed, low-voltage portable instrumentation where power efficiency outweighs speed.
MAX349EPN 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:
- Through Hole
- Supplier Device Package:
- 18-PDIP
MAX349EPN FAQ
1.How can I place an order for MAX349EPN through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX349EPN 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 MAX349EPN reliable?
The price and inventory of MAX349EPN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX349EPN is usually 5 days.
3.What payment methods are accepted for MAX349EPN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX349EPN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX349EPN?
MAX349EPN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX349EPN 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 MAX349EPN?
For technical support, including MAX349EPN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX349EPN requirements.
6.How does Aetrix verify that MAX349EPN is sourced from the original manufacturer or authorized distributors?
All MAX349EPN 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 MAX349EPN meets industry standards.
7.What is the process for return or replacement of MAX349EPN?
All MAX349EPN units undergo pre-shipment inspection (PSI). If there is an issue with MAX349EPN, 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 MAX349EPN part is unused and in its original packaging.
Return procedure for MAX349EPN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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