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Analog Devices Inc./Maxim Integrated MAX349EAP+
- Part No.:
- MAX349EAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX349EAP+.pdf
- Description:
- IC MUX 8:1 100OHM 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,387
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Product details
Overview
MAX349EAP+ 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 requiring low-leakage, high-isolation switching.
For engineers reviewing the MAX349EAP+ datasheet, MAX349EAP+ pinout, MAX349EAP+ application, or MAX349EAP+ 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 routing in ATE and avionics signal paths.
Technical Context
The MAX349EAP+ 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 update simultaneously upon CS high transition, enabling deterministic channel reconfiguration without glitching.
Its analog path supports bidirectional rail-to-rail signals across V− to V+, with matched on-resistance (≤16Ω) and flatness (≤10Ω) over the full signal range, while digital inputs maintain TTL/CMOS logic thresholds (0.8V/2.4V) under ±5V or +5V supplies - ensuring interoperability with microcontrollers and FPGAs.
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 sensor or audio routing. |
| On-Resistance Match | ≤16Ω between channels - critical for multi-channel instrumentation where channel-to-channel gain consistency is required. |
| Off-Leakage Current | 0.1nA at +25°C - preserves accuracy in high-impedance sensor front-ends and battery-powered measurement nodes. |
| Supply Range | ±2.7V to ±8V dual or +2.7V to +16V single - enables flexible power architecture in mixed-signal systems with legacy ±5V or modern low-voltage rails. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire interface - allows direct connection to standard MCU SPI peripherals without level-shifting or protocol translation. |
| Operating Temp | -40°C to +85°C - qualified for industrial control, avionics, and automotive under-hood auxiliary systems. |
| ESD Protection | >2kV per Method 3015.7 - enhances robustness during board handling and field deployment in noisy environments. |
Pinout & Package
MAX349EAP+ is housed in a 20-pin SSOP package (body width 0.209", JEDEC MO-153). Pin 1 is located at the top-left corner adjacent to the index mark; pin numbering proceeds counterclockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select Input | Active-low enable for serial data loading; rising edge latches 8-bit configuration into analog switch control register. |
| 2 (V+) | Positive Supply | Accepts +2.7V to +16V (single) or +2.7V to +8V (dual); powers internal logic and analog switches. |
| 3 (DIN) | Serial Data Input | Accepts MSB-first 8-bit word; sampled on SCLK rising edge while CS is low. |
| 4 (GND) | Digital Ground Reference | Logic reference only; analog signals float between V+ and V− with no ground dependency. |
| 5 (COM) | Common Analog Terminal | Bidirectional mux output; connects to any selected NOx pin; supports rail-to-rail voltage swing. |
| 6–13 (NO0–NO7) | Normally Open Inputs | Eight independent analog inputs; each connects to COM when corresponding bit = 1 in shift register. |
| 14 (N.C.) | No Connect | Not internally bonded; must remain unconnected per datasheet. |
| 15 (V−) | Negative Supply | Accepts -2.7V to -8V (dual) or 0V (single-supply mode); sets lower analog signal limit. |
| 16 (DOUT) | Serial Data Output | Shift register Q7 output; provides daisy-chain capability; logic high = V+ level. |
| 17 (RESET) | Asynchronous Reset | Pull low to force all switches OFF and clear shift register to 00000000b - no clock required. |
| 18 (SCLK) | Serial Clock Input | Drives shift register on rising edge; supports up to 2.1MHz clock rate with defined setup/hold timing. |
| 19–20 | N.C. | Not internally connected; pins 19 and 20 are unused in MAX349EAP+ SSOP package. |
Key Features
| Feature | Design Value |
|---|---|
| 8 independently controllable SPST switches | Enables arbitrary channel selection - including multiple ON states - for flexible signal routing beyond standard 1-of-8 mux behavior. |
| Rail-to-Rail® analog signal handling | Supports input/output voltages from V− to V+ without clipping, essential for ±10V industrial sensors and audio line-level signals. |
| Daisy-chainable serial interface | Single SCLK/CS/DIN bus controls multiple MAX349EAP+ devices, reducing MCU GPIO usage and PCB routing complexity. |
| Break-before-make switching | Guaranteed 1–10ns delay prevents momentary shorting between channels during reconfiguration - critical for fault-tolerant systems. |
| Asynchronous RESET input | Hardware-initiated fail-safe reset clears all switches and shift register without software intervention or clock dependency. |
Applications
| Industrial Process Monitoring | Avionics Signal Routing |
|---|---|
Use Scenario: Multiplexing thermocouple, RTD, and strain gauge outputs from 8 sensor nodes into a single ADC channel in a PLC backplane. IC Role / Device Role / Timing Role: Bidirectional analog switch providing low-offset, low-leakage signal path with simultaneous channel update via CS edge. Use Value: 0.1nA off-leakage preserves µV-level sensor resolution; 100Ω RON minimizes gain error in 24-bit sigma-delta measurements. | Use Scenario: Routing discrete analog signals (e.g., pitot-static pressure, angle-of-attack, cabin temp) to centralized flight data acquisition unit. IC Role / Device Role / Timing Role: High-reliability, ESD-hardened multiplexer operating across -40°C to +85°C with deterministic SPI-controlled switching. Use Value: >2kV HBM ESD rating withstands aircraft static discharge; rail-to-rail support handles ±5V sensor outputs without external level-shifting. |
| ATE Test Instrumentation | Audio Signal Switching |
Use Scenario: Configurable signal path in automated test equipment connecting DUT analog I/O to calibrated sources, loads, and measurement instruments. IC Role / Device Role / Timing Role: Precision analog switch with matched RON and low crosstalk (<–90dB) enabling multi-point calibration without channel interaction. Use Value: ≤16Ω RON match ensures consistent stimulus levels across channels; <–90dB crosstalk prevents false readings during parallel testing. | Use Scenario: Channel-selectable routing of line-level audio inputs (RCA/XLR) to DSP processing blocks in professional audio mixers. IC Role / Device Role / Timing Role: Low-distortion, low-charge-injection (100pC typical) analog switch supporting wideband audio (20Hz–20kHz) with minimal THD. Use Value: 100pC charge injection prevents audible pop/click during real-time switching; 100Ω RON compatible with 600Ω pro-audio impedance standards. |
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, 3.5Ω RON (±5V), but only supports +3V to +5.5V single supply; no dual-supply or rail-to-rail operation. | Restricted to low-voltage, single-rail systems; unsuitable for ±5V industrial sensors or avionics. | Select ADG708BRUZ only when ultra-low RON is prioritized and supply is strictly +3.3V/+5V with no negative rail. |
| TMUX1308PWR | 8-channel mux with 1.8Ω RON (3.3V), integrated level shifters, but rated only for –40°C to +125°C with no guaranteed leakage spec below 1nA. | Lacks sub-nA leakage and dual-supply flexibility; optimized for automotive infotainment, not precision measurement. | Choose TMUX1308PWR for cost-sensitive, high-speed digital routing where leakage and supply range are secondary. |
Compared with ADG708BRUZ and TMUX1308PWR, MAX349EAP+ uniquely combines extended temperature operation (-40°C to +85°C), dual-supply capability (±2.7V to ±8V), sub-nA leakage, and rail-to-rail analog performance - making it the only option qualified for high-accuracy, mixed-supply industrial and aerospace signal routing.
Availability
MAX349EAP+ is available at Aetrix Electronics and suitable for industrial process monitoring, avionics signal routing, and ATE instrumentation requiring stable component supply across extended temperature ranges and dual-supply architectures.
Supply support for MAX349EAP+ 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, communications, and computing applications.
The MAX349EAP+ belongs to Maxim's serially controlled analog switch product line, engineered specifically for high-fidelity, low-leakage, multi-channel signal routing in harsh-environment data acquisition and test systems.
FAQ
What is the maximum clock frequency supported by the MAX349EAP+ serial interface?
The MAX349EAP+ supports an SCLK frequency up to 2.1MHz under all operating conditions, as specified in the timing characteristics table for dual, single +5V, and single +3V supplies. This allows full 8-bit configuration updates in under 4µs, enabling rapid channel reconfiguration in time-critical ATE and control applications. The MAX349EAP+ maintains valid setup/hold timing margins even at this maximum rate.
Does the MAX349EAP+ support true bidirectional analog signal flow?
Yes, the MAX349EAP+ supports fully bidirectional analog signal flow: COM and NOx pins are electrically identical and interchangeable, with equal on-resistance and leakage in either direction. Signals pass rail-to-rail from V− to V+, and the device imposes no polarity constraints - enabling use as both multiplexer and demultiplexer in the same design without layout changes.
How does the RESET pin function on the MAX349EAP+?
The RESET pin on the MAX349EAP+ is an asynchronous, active-low input that forces all eight switches to the OFF state and clears the internal 8-bit shift register to 00000000b - regardless of SCLK or CS state. This hardware reset requires no clock cycles or serial data, providing deterministic fail-safe recovery in safety-critical systems like avionics or industrial shutdown circuits.
Can multiple MAX349EAP+ devices be connected in series using the DOUT pin?
Yes, the MAX349EAP+ supports daisy-chaining: DOUT of one device connects to DIN of the next, with all CS and SCLK lines tied together. When CS rises, all devices simultaneously latch their respective 8-bit words - the first device receives bits D7–D0, the second receives the next 8 bits shifted through DOUT, and so on. This reduces MCU GPIO count and simplifies firmware for multi-mux systems.
What is the guaranteed on-resistance flatness specification for the MAX349EAP+?
The MAX349EAP+ guarantees on-resistance flatness of ≤10Ω over the full specified analog signal range (V− to V+) when operated with ±5V supplies at +25°C. Flatness is defined as the difference between maximum and minimum RON measured across VCOM = –3V, 0V, and +3V - ensuring consistent gain and minimal distortion in precision AC-coupled signal paths.
MAX349EAP+ 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
MAX349EAP+ FAQ
1.How can I place an order for MAX349EAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX349EAP+ 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 MAX349EAP+ reliable?
The price and inventory of MAX349EAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX349EAP+ is usually 5 days.
3.What payment methods are accepted for MAX349EAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX349EAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX349EAP+?
MAX349EAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX349EAP+ 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 MAX349EAP+?
For technical support, including MAX349EAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX349EAP+ requirements.
6.How does Aetrix verify that MAX349EAP+ is sourced from the original manufacturer or authorized distributors?
All MAX349EAP+ 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 MAX349EAP+ meets industry standards.
7.What is the process for return or replacement of MAX349EAP+?
All MAX349EAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX349EAP+, 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 MAX349EAP+ part is unused and in its original packaging.
Return procedure for MAX349EAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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