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Analog Devices Inc./Maxim Integrated MAX349CAP+
- Part No.:
- MAX349CAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX349CAP+.pdf
- Description:
- IC MUX 8:1 100OHM 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,454
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Product details
Overview
MAX349CAP+ 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 - used in precision data-acquisition front-ends requiring low leakage and matched switch characteristics.
For engineers reviewing the MAX349CAP+ datasheet, MAX349CAP+ pinout, MAX349CAP+ application, or MAX349CAP+ equivalent, this page delivers verified electrical specs, daisy-chain timing behavior, COM/NO terminal roles, off-leakage performance at +85°C, and direct alternatives for serial mux replacement in industrial control and ATE systems.
Technical Context
The MAX349CAP+ 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, satisfying SPI Mode 0 (CPOL=0, CPHA=0) requirements. All switches are fully bidirectional with symmetrical analog signal paths.
It supports daisy-chaining via DOUT-to-DIN cascading across multiple devices under shared CS control, enabling synchronized reconfiguration of up to N × 8 channels with one serial stream. RESET asynchronously forces all switches OFF and clears the shift register to zero.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Count & Type | 8 independently controlled SPST switches; single 8-to-1 mux architecture |
| 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 - critical for multi-channel ratiometric measurements and calibration stability |
| Off-Leakage Current | 5nA max at +85°C - preserves accuracy in high-impedance sensor interfaces and sample-hold circuits |
| Supply Range | ±2.7V to ±8V dual or +2.7V to +16V single - enables flexible integration in mixed-voltage industrial and avionics systems |
| Logic Compatibility | TTL/CMOS thresholds (0.8V/2.4V) with ±5V or +5V supply - eliminates level-shifting in standard microcontroller interfaces |
| ESD Protection | >2kV per Method 3015.7 - enhances robustness in handling-sensitive test equipment and field-deployed systems |
Pinout & Package
MAX349CAP+ is housed in a 20-pin SSOP package (body width 0.154", 0.65mm pitch). Pin 14 is NC (not internally connected); pins 10, 15, and 16 are also NC in MAX349 configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SCLK | Serial clock input | Rising-edge synchronous shift register clock; compatible with SPI/QSPI/MICROWIRE |
| 2 V+ | Positive analog supply | Accepts +2.7V to +16V (single) or +2.7V to +8V (dual); powers analog and digital sections |
| 3 DIN | Serial data input | MSB-first 8-bit control word; latched only when CS is low |
| 4 GND | Digital ground reference | Reference for logic inputs; analog signals referenced only to V+ and V− |
| 5 COM | Common analog terminal | Mux output node; bidirectional - may serve as input or output depending on switch state |
| 6–9, 11–14 NO0–NO7 | Normally open analog terminals | Eight independent input/output channels; conduct equally well in either direction |
| 15 V− | Negative analog supply | Accepts −2.7V to −8V (dual); tied to GND for single-supply operation |
| 16 DOUT | Serial data output | Shift register Q8 output; data delayed by 8 clocks; logic high = V+ |
| 17 RESET | Asynchronous reset input | Active-low; forces all switches OFF and clears shift register to 00000000b |
| 18 CS | Chip select input | Active-low; enables serial loading; rising edge commits new switch states |
| 10, 14, 15, 16 N.C. | No internal connection | Not bonded; must be left unconnected or grounded per layout best practice |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail analog signal handling | Supports signals from V− to V+ without clipping - essential for full-scale sensor interfacing and audio routing |
| Break-before-make switching | Guaranteed 1ns–10ns delay prevents momentary shorting during channel transitions - protects sensitive sources and loads |
| Flat on-resistance (10Ω max) | Variation ≤10Ω over full signal range (±3V at ±5V supplies) - minimizes distortion in AC-coupled and wide-dynamic-range applications |
| Daisy-chainable serial interface | Single SCLK/CS/DIN bus controls multiple MAX349CAP+ units - reduces MCU GPIO count and simplifies PCB routing |
| Power-up default: all switches OFF | Internal shift register resets to 00000000b at power-on - prevents undefined analog connections during boot |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Multiplexing thermocouple, RTD, and strain gauge signals into a single ADC channel in PLC I/O modules. IC Role / Device Role / Timing Role: 8-to-1 analog mux providing channel selection under microcontroller SPI control with <400ns turn-on time. Use Value: Enables cost-effective 8-channel scanning without external level shifters or op-amp buffers due to rail-to-rail support and 5nA off-leakage at +85°C. |
Use Scenario: Routing calibrated reference voltages and DUT outputs to precision metrology ADCs in benchtop ATE systems. IC Role / Device Role / Timing Role: Bidirectional analog switch managing signal path integrity during automated calibration sequences. Use Value: 16Ω max RON match ensures ratiometric accuracy across channels; >2kV ESD withstand protects against handler-induced transients. |
| Avionics Sensor Interface | Audio Signal Routing |
Use Scenario: Selecting between redundant pressure, temperature, and angle-of-attack sensors in flight control computers. IC Role / Device Role / Timing Role: Fault-tolerant analog mux with asynchronous RESET for fail-safe channel isolation. Use Value: Dual-supply operation (±5V) matches aircraft power architecture; -55°C to +125°C M-grade variants available for extended temp use. |
Use Scenario: Dynamic routing of line-level audio inputs (mic, instrument, playback) to DSP processing chains in pro-audio mixers. IC Role / Device Role / Timing Role: Low-distortion SPST switch with <0.1pC charge injection and >90dB off-isolation. Use Value: 100Ω RON and flatness preserve frequency response; CMOS/TTL compatibility allows direct FPGA control without glue logic. |
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 | Better RON and bandwidth, but higher supply voltage limits and no integrated logic threshold adaptation | Preferred where ultra-low on-resistance and high-speed switching (>10MHz) are required; not drop-in due to VDRIVE and pinout mismatch |
| TMUX1308PWR | 8-channel, single 1.08V–5.5V supply only, 5.5Ω typical RON, I²C interface (not SPI), no RESET pin | Lower voltage operation and smaller WQFN package, but lacks dual-supply capability and asynchronous reset | Suitable for battery-powered portable instrumentation; incompatible for dual-supply or RESET-critical systems like ATE |
Compared with ADG1408BRUZ and TMUX1308PWR, the MAX349CAP+ uniquely supports true dual-supply operation down to ±2.7V, integrates asynchronous RESET, and maintains TTL/CMOS logic compatibility without external level shifters - making it optimal for legacy industrial and avionics designs requiring robust, flexible analog switching.
Availability
MAX349CAP+ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, avionics sensor conditioning, and pro-audio signal routing requiring stable component supply and long-term manufacturability.
Supply support for MAX349CAP+ 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+ belongs to Maxim's serially controlled analog switch/multiplexer product line, engineered for high-reliability data acquisition and signal routing where low leakage, matched RON, and SPI-compatible configurability are critical.
FAQ
What is the maximum allowable supply voltage for MAX349CAP+ in dual-supply mode?
The MAX349CAP+ supports dual-supply operation from ±2.7V to ±8V. Absolute maximum ratings specify V+ up to +17V and V− down to −17V, but functional operation is guaranteed only within ±2.7V to ±8V. Exceeding ±8V risks parametric degradation or latch-up. For reliable long-term use, maintain V+ ≤ +8V and V− ≥ −8V as specified in the Electrical Characteristics table.
Does MAX349CAP+ support single-supply operation with a 3.3V rail?
Yes, MAX349CAP+ operates with a single +2.7V to +16V supply. At +3.3V, on-resistance increases to ~500Ω (typical), and logic thresholds remain valid (VIH = 2.4V, VIL = 0.8V). The device retains full functionality including daisy-chaining and RESET, though timing parameters such as tON extend to ~700ns. Verified in Single +3V Supply Electrical Characteristics section.
How does the RESET pin function on MAX349CAP+?
The RESET pin on MAX349CAP+ is active-low and asynchronous. Driving RESET low forces all eight switches to the OFF state and clears the internal 8-bit shift register to 00000000b, regardless of CS or SCLK state. This provides deterministic power-up or fault-recovery behavior. When held high (or tied to V+), RESET has no effect and normal serial operation proceeds.
Can MAX349CAP+ be daisy-chained with MAX350 devices?
Yes, MAX349CAP+ can be daisy-chained with MAX350 devices using the DOUT-to-DIN connection under shared CS control. Both share identical 8-bit serial protocol, timing, and logic levels. The DOUT output of one device feeds DIN of the next, and a single 16-bit (or longer) stream configures both. Confirmed in the Daisy-Chaining section and Figure 5 of the datasheet.
What is the off-isolation performance of MAX349CAP+ at 100kHz?
MAX349CAP+ delivers >90dB off-isolation at 100kHz under RL = 50Ω, CL = 15pF conditions (dual ±5V supplies). This value is measured as 20log₁₀(VCOM/VNO) with COM as output and NO as input to the off switch. High off-isolation ensures minimal crosstalk between unselected channels in multi-signal routing applications like ATE and audio mixing.
MAX349CAP+ 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:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
MAX349CAP+ FAQ
1.How can I place an order for MAX349CAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX349CAP+ 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+ reliable?
The price and inventory of MAX349CAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX349CAP+ is usually 5 days.
3.What payment methods are accepted for MAX349CAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX349CAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX349CAP+?
MAX349CAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX349CAP+ 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+?
For technical support, including MAX349CAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX349CAP+ requirements.
6.How does Aetrix verify that MAX349CAP+ is sourced from the original manufacturer or authorized distributors?
All MAX349CAP+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX349CAP+?
All MAX349CAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX349CAP+, 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+ part is unused and in its original packaging.
Return procedure for MAX349CAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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