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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:2,025
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Product details
Overview
The MAX349CPN from Maxim Integrated is an 8-channel, serially controlled, bidirectional analog multiplexer with SPI/QSPI/MICROWIRE-compatible 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 MAX349CPN datasheet, MAX349CPN pinout, MAX349CPN application, or MAX349CPN equivalent, this page delivers verified electrical specs, daisy-chainable serial timing, COM/NO pin roles, thermal leakage behavior, and direct alternatives for industrial ATE and avionics signal routing designs.
Technical Context
The MAX349CPN implements an 8-bit shift register driving eight independent SPST analog switches; data is clocked in on SCLK rising edge while CS is low, and switch states update synchronously on CS rising edge. All NO and COM pins are fully bidirectional with no intrinsic input/output assignment.
It supports daisy-chaining via DOUT-to-DIN cascading across multiple devices under shared CS control, and includes asynchronous RESET to force all switches OFF and clear internal registers - critical for deterministic power-up and fault recovery 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 sensor or DAC output paths. |
| On-Resistance Match (∆RON) | 16Ω max between channels - enables accurate channel-to-channel ratio matching in differential or ratiometric measurements. |
| Off-Leakage Current | 0.1nA at +25°C - preserves high-impedance node integrity in low-current sensor interfaces and battery-powered systems. |
| Analog Signal Range | Rail-to-rail: (V− − 2V) to (V+ + 2V) - supports full dynamic range utilization with ±5V supplies or single +5V operation. |
| Serial Interface | SPI/QSPI/MICROWIRE-compatible 3-wire interface - integrates directly with standard microcontroller peripherals without protocol translation. |
| Power Supply Range | ±2.7V to ±8V dual or +2.7V to +16V single - accommodates legacy ±5V, modern low-voltage, and wide-range industrial rails. |
| Turn-On/Off Time | 400ns/300ns typical (dual ±5V) - enables fast channel switching in real-time test equipment and digital audio routing. |
Pinout & Package
MAX349CPN is supplied in an 18-pin plastic DIP package (0°C to +70°C operating range). Pin functions are validated per Maxim's official pin configuration diagram (Rev 1, 10/98).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 18 | SCLK, CS | Serial clock input and chip-select enable - CS rising edge latches new switch configuration; SCLK rising edge clocks DIN data into internal 8-bit shift register. |
| 3, 16 | DIN, DOUT | Serial data input and daisy-chain output - DOUT outputs delayed DIN data (8-cycle latency), enabling multi-device cascading under shared CS. |
| 5, 6–13 | COM, NO0–NO7 | Bidirectional analog common and normally-open terminals - interchangeable as inputs or outputs; no polarity constraint; signals pass equally in both directions. |
| 2, 15, 17 | V+, V−, RESET | Positive supply, negative supply (GND for single supply), and asynchronous reset - RESET = low forces all switches OFF and clears shift register to zero state. |
| 4, 10, 14 | GND, N.C. | Digital ground reference and no-connect pins - GND serves only digital logic; analog signals float between V+ and V− with no ground reference required. |
Key Features
| Feature | Design Value |
|---|---|
| 8 independently controllable SPST switches | Enables flexible 8:1 multiplexing or arbitrary channel selection - any combination of NOx connected to COM simultaneously, supporting parallel sensor readout or signal fan-in. |
| Rail-to-rail analog signal handling | Supports full-scale input/output swing from V− − 2V to V+ + 2V - eliminates level-shifting circuitry in mixed-supply systems and preserves DC accuracy. |
| Asynchronous RESET input | Guarantees known OFF-state and cleared shift register on power-up or fault - essential for fail-safe behavior in avionics and medical instrumentation. |
| 2kV ESD protection (HBM) | Meets MIL-STD-883 Method 3015.7 - protects against handling damage and board-level transients without external TVS diodes. |
| TTL/CMOS-compatible logic thresholds | 0.8V/2.4V thresholds at ±5V or +5V supplies - ensures robust interfacing with diverse microcontrollers and FPGAs without level translators. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Multiplexing thermocouple, RTD, and strain gauge signals from 8 sensor nodes into a single ADC channel in PLC I/O modules. IC Role / Device Role / Timing Role: Analog multiplexer providing low-leakage, matched-RON switching between high-impedance sensors and precision ADC front-end. Use Value: 0.1nA off-leakage prevents sensor bias current errors; 16Ω RON match maintains ratiometric accuracy across temperature channels. | Use Scenario: Routing calibration references, DUT signals, and stimulus waveforms across multiple instrument channels in benchtop ATE. IC Role / Device Role / Timing Role: High-speed, programmable analog switch matrix controlled via SPI from test controller FPGA. Use Value: 400ns turn-on time enables sub-microsecond channel reconfiguration; daisy-chain capability reduces GPIO count for multi-board test fixtures. |
| Avionics Data Acquisition | Audio Signal Routing |
Use Scenario: Selecting among redundant air-data sensors (pitot/static) and inertial measurement unit outputs in flight control computers. IC Role / Device Role / Timing Role: Fault-tolerant analog mux with guaranteed power-up OFF state and RESET-initiated safe default. Use Value: Asynchronous RESET ensures deterministic switch-off during brownout or reset sequences; ±8V supply range supports legacy aircraft power buses. | Use Scenario: Dynamic routing of line-level analog audio between microphone preamps, DSP inputs, and amplifier outputs in pro-audio mixers. IC Role / Device Role / Timing Role: Low-distortion, rail-to-rail analog switch enabling transparent signal path selection without clipping. Use Value: <−90dB crosstalk and >90dB off-isolation prevent audible bleed between channels; flat 10Ω RON variation preserves frequency response fidelity. |
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, 4.5Ω typical RON, but only +1.8V to +5.5V single-supply operation; no dual-supply support. | Best suited for low-voltage portable systems; unsuitable for ±5V or wide-range industrial rails. | Select when ultra-low on-resistance and low supply voltage are primary; avoid when dual-supply or rail-to-rail beyond 0–5V is required. |
| TMUX1308PWR | 8-channel mux with 1.8Ω typical RON and 1.62V–5.5V supply, but lacks RESET pin and daisy-chain DOUT; SPI interface requires external framing logic. | Optimized for high-speed consumer audio/data switching; no native support for deterministic power-up or multi-device synchronization. | Choose for cost-sensitive, high-bandwidth applications where RESET and daisy-chaining are not needed. |
Compared with ADG708BRUZ and TMUX1308PWR, the MAX349CPN uniquely combines dual-supply flexibility, hardware RESET, daisy-chain capability, and guaranteed rail-to-rail operation - making it the only option among the three qualified for avionics and industrial ATE where supply range, fault recovery, and multi-device coordination are mandatory.
Availability
MAX349CPN is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, avionics data acquisition, and professional audio signal routing requiring stable component supply across extended temperature and voltage ranges.
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) designs precision analog, mixed-signal, and power-management ICs for demanding industrial, automotive, and communications applications.
The MAX349CPN belongs to Maxim's serially controlled analog switch/multiplexer product line, engineered specifically for high-reliability signal routing in environments requiring low leakage, matched performance, and robust digital control - especially where daisy-chaining and deterministic reset are critical.
FAQ
What is the maximum allowable analog signal voltage range for MAX349CPN when operated with ±5V supplies?
The MAX349CPN supports rail-to-rail analog signals from (V− − 2V) to (V+ + 2V). With ±5V supplies, this yields a usable range of −7V to +7V. This specification is confirmed in the Absolute Maximum Ratings table and Electrical Characteristics section of the official datasheet, and applies across the full 0°C to +70°C operating temperature range of the MAX349CPN.
Does MAX349CPN support daisy-chaining with other MAX349CPN devices, and how is it implemented?
Yes, MAX349CPN supports daisy-chaining via its DOUT pin, which outputs the DIN data stream delayed by eight clock cycles. To cascade multiple MAX349CPN units, connect DOUT of one device to DIN of the next, tie all CS and SCLK lines together, and shift 8 × N bits during a single CS low period. On CS rising edge, all N devices update simultaneously - a capability explicitly documented in the "Daisy-Chaining" section of the MAX349CPN datasheet.
What is the guaranteed on-resistance match (∆RON) between channels of MAX349CPN, and under what conditions is it specified?
The MAX349CPN guarantees ∆RON ≤ 16Ω between any two channels, measured at TA = +25°C with V+ = +5V, V− = −5V, VCOM = ±3V, and INO = 1mA. This parameter is explicitly listed in the "ELECTRICAL CHARACTERISTICS-Dual Supplies" table and reflects the worst-case difference between maximum and minimum RON values across all eight switches - critical for ratiometric and differential measurement accuracy.
Can MAX349CPN operate from a single +3.3V supply, and what are the key performance trade-offs?
Yes, MAX349CPN operates from a single +3.3V supply (within +3.0V to +3.6V range). At +3.3V, typical on-resistance increases to ~400Ω (vs. 100Ω at ±5V), and turn-on time extends to ~700ns. These degradations are quantified in the "ELECTRICAL CHARACTERISTICS-Single +3V Supply" tables and reflect inherent MOSFET channel resistance scaling - users must verify signal integrity and settling time in their specific +3.3V application.
Is the RESET pin on MAX349CPN active-high or active-low, and what state do the switches assume when RESET is asserted?
The RESET pin on MAX349CPN is active-low: driving RESET to logic low forces all eight switches to the OFF state and resets the internal 8-bit shift register to zero. This behavior is guaranteed across the full operating temperature range and is explicitly defined in the "Pin Description" and "Detailed Description" sections of the MAX349CPN datasheet - ensuring deterministic power-up and fault recovery.
MAX349CPN 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:
- 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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