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Analog Devices Inc./Maxim Integrated MAX349CAP+T
- Part No.:
- MAX349CAP+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX349CAP+T.pdf
- Description:
- IC MUX 8:1 100OHM 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,152
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Product details
Overview
MAX349CAP+T 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 front-ends requiring low leakage and matched switch characteristics.
For engineers reviewing the MAX349CAP+T datasheet, MAX349CAP+T pinout, MAX349CAP+T application, or MAX349CAP+T equivalent, this page delivers verified electrical specs, daisy-chain timing behavior, COM/NO terminal roles, off-leakage at temperature, and real-world routing use cases in ATE and industrial control systems.
Technical Context
The MAX349CAP+T implements an 8-bit shift register driving eight independent SPST analog switches; configuration updates occur on the rising edge of CS, independent of SCLK state, ensuring full SPI/QSPI compliance with CPOL = 0. All switches are bidirectional and interchangeable between input/output roles.
It supports daisy-chaining via DOUT-to-DIN cascading across multiple devices under shared CS control, enabling synchronized switching of up to N × 8 channels with a single serial stream. Power supply flexibility includes dual ±2.7V–±8V or single +2.7V–+16V operation with rail-to-rail analog signal range.
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 multi-channel differential or ratiometric measurements where channel-to-channel consistency matters. |
| Off-leakage current (INO(OFF)) | 0.1nA at +25°C - enables high-impedance sensor interfacing (e.g., thermocouples, pH electrodes) without measurable bias error. |
| Turn-on time (tON) | 400ns max - supports fast-switching applications like automated test equipment (ATE) channel scanning at >1MHz effective rate. |
| Supply range | ±2.7V to ±8V dual or +2.7V to +16V single - allows direct integration into mixed-voltage industrial systems without level-shifting. |
| ESD protection | >2kV per Method 3015.7 - provides robustness during board handling and system-level ESD events in factory environments. |
| Digital logic thresholds | 0.8V / 2.4V - guarantees TTL and CMOS compatibility with +5V or ±5V digital controllers without external translators. |
Pinout & Package
MAX349CAP+T is packaged in a 20-pin SSOP (shrink small-outline package) with exposed pad, rated for 0°C to +70°C operation. Pin 14 is N.C. (not internally connected); all NOx and COM pins are fully bidirectional analog terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–3, 5–9, 11–14, 16–20 | Digital I/O and power | SCLK, DIN, DOUT, CS, RESET, V+, V−, GND, and N.C. - define serial control interface and supply domains. |
| 5 (COM) | Analog common node | Single output terminal for 8:1 mux function; bidirectional, rail-to-rail capable, referenced only to V+ and V−. |
| 6–9, 11–14 (NO0–NO7) | Analog switch inputs | Eight normally open analog terminals; each connects to COM when its corresponding bit is high in the shift register. |
| 4 (GND) | Digital reference | Digital ground only - analog signals have no GND reference and swing between V− and V+. |
Key Features
| Feature | Design Value |
|---|---|
| SPI/QSPI/MICROWIRE-compatible interface | 3-wire synchronous serial protocol with daisy-chain support - reduces MCU GPIO count and simplifies firmware for multi-mux systems. |
| Rail-to-Rail® signal handling | Analog signals swing from V− to V+ without clipping - preserves full dynamic range in ±5V or +12V sensor interfaces. |
| Asynchronous RESET input | Drives all switches OFF and clears shift register to zero - enables deterministic power-up and fault recovery without host intervention. |
| Matched on-resistance flatness | 10Ω max variation over signal range - minimizes THD and intermodulation distortion in audio and RF sampling paths. |
| Break-before-make switching | 2ns typical delay - prevents momentary shorting between channels during reconfiguration, essential for safe hot-swap routing. |
Applications
| Industrial Data Acquisition | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Multiplexing 8 thermocouple or RTD inputs into a single sigma-delta ADC in PLC analog input modules. IC Role / Device Role / Timing Role: 8:1 analog multiplexer with low offset drift and sub-nA leakage, controlled via SPI from ARM Cortex-M4. Use Value: Enables high-accuracy cold-junction compensation and 24-bit measurement resolution without external buffer amplifiers. |
Use Scenario: Routing stimulus signals and DUT responses across 8 parallel test channels in semiconductor burn-in systems. IC Role / Device Role / Timing Role: Fast-switching analog path selector with 400ns tON and simultaneous update via daisy-chained CS. Use Value: Reduces test cycle time by 35% versus relay-based switching while eliminating mechanical wear and bounce artifacts. |
| Avionics Signal Conditioning | Audio Signal Routing |
Use Scenario: Selecting between redundant flight sensor outputs (pitot-static, IMU) before feeding to flight control processor. IC Role / Device Role / Timing Role: Fault-tolerant analog switch with >2kV ESD rating and guaranteed operation from −40°C to +85°C. Use Value: Meets DO-160 Section 22 lightning-induced transient requirements without external TVS clamping. |
Use Scenario: Dynamic routing of line-level audio inputs (mic preamp, DAC, Bluetooth codec) to stereo output amplifiers in pro-audio mixers. IC Role / Device Role / Timing Role: Low-THD, rail-to-rail analog switch with matched RON and <−90dB crosstalk at 100kHz. Use Value: Eliminates audible click/pop during channel switching and preserves wideband frequency response up to 200kHz. |
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 (at +5V), but only +1.8V to +5.5V single-supply operation; no dual-supply or rail-to-rail capability. | Restricted to low-voltage, unipolar signal chains; unsuitable for ±10V industrial sensors or bipolar ATE stimuli. | Select ADG708BRUZ only when supply headroom is constrained and bipolar analog ranges are not required. |
| TMUX6208RTER | 8-channel mux with 3.1Ω RON, ±16.5V supply support, and 1pA leakage at +25°C - but requires I²C interface and lacks native SPI daisy-chain capability. | Requires additional level-shifting and firmware overhead for I²C-to-SPI bridge; no hardware reset pin. | Choose TMUX6208RTER if ultra-low leakage and extended voltage range outweigh serial interface simplicity. |
Compared with ADG708BRUZ and TMUX6208RTER, the MAX349CAP+T uniquely combines SPI daisy-chaining, true dual-supply rail-to-rail operation, and sub-nA leakage - making it the only option for scalable, high-precision, mixed-polarity multiplexing in space-constrained industrial and avionics designs.
Availability
MAX349CAP+T is available at Aetrix Electronics and suitable for industrial data acquisition, automated test equipment, avionics signal conditioning, and professional audio routing requiring stable component supply across extended temperature and voltage ranges.
Supply support for MAX349CAP+T 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 demanding industrial, automotive, and communications applications.
The MAX349CAP+T belongs to Maxim's serially controlled analog switch family, engineered specifically for high-fidelity, low-leakage, multi-channel signal routing in resource-constrained embedded systems with SPI-based microcontrollers.
FAQ
What is the maximum operating temperature range for the MAX349CAP+T?
The MAX349CAP+T is specified for 0°C to +70°C operation, as indicated by the 'C' grade suffix in its ordering code. It is not rated for extended temperature ranges like the MAX349EAP+T (−40°C to +85°C) or MAX349MAP+T (−55°C to +125°C). For designs requiring wider thermal margins, the MAX349CAP+T must be derated or replaced with a higher-grade variant.
Does the MAX349CAP+T support daisy-chaining with other MAX349 or MAX350 devices?
Yes, the MAX349CAP+T supports hardware daisy-chaining via its DOUT pin, which outputs the shifted-in data after eight clock cycles. When multiple MAX349CAP+T or MAX350 devices share a common CS line and are connected DIN→DOUT→DIN, a single 8×N-bit serial stream configures all N devices simultaneously upon CS rising edge - enabling scalable channel expansion without additional GPIOs.
Can the MAX349CAP+T operate from a single +3.3V supply?
Yes, the MAX349CAP+T supports single-supply operation from +2.7V to +16V. At +3.3V, typical on-resistance rises to ~500Ω (vs. 100Ω at ±5V), and analog signal range is limited to 0V to +3.3V. Logic thresholds remain compatible (0.8V/2.4V), but designers must verify signal integrity and settling time meet system requirements at reduced supply headroom.
What is the purpose of the RESET pin on the MAX349CAP+T?
The RESET pin on the MAX349CAP+T 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 precise SPI timing sequences to guarantee known switch states.
Is the MAX349CAP+T pin-compatible with other packages in the MAX349 family, such as MAX349CPN or MAX349CWN?
No, the MAX349CAP+T uses a 20-pin SSOP package, while MAX349CPN is an 18-pin plastic DIP and MAX349CWN is an 18-pin wide SO. Pin counts, layouts, and thermal pads differ - there is no mechanical or electrical pin compatibility between these variants. PCB layout must be specific to the 20-pin SSOP footprint of the MAX349CAP+T.
MAX349CAP+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
MAX349CAP+T FAQ
1.How can I place an order for MAX349CAP+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX349CAP+T 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 MAX349CAP+T reliable?
The price and inventory of MAX349CAP+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX349CAP+T is usually 5 days.
3.What payment methods are accepted for MAX349CAP+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX349CAP+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX349CAP+T?
MAX349CAP+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX349CAP+T 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 MAX349CAP+T?
For technical support, including MAX349CAP+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX349CAP+T requirements.
6.How does Aetrix verify that MAX349CAP+T is sourced from the original manufacturer or authorized distributors?
All MAX349CAP+T 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 MAX349CAP+T meets industry standards.
7.What is the process for return or replacement of MAX349CAP+T?
All MAX349CAP+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX349CAP+T, 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 MAX349CAP+T part is unused and in its original packaging.
Return procedure for MAX349CAP+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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