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Analog Devices Inc./Maxim Integrated MAX350CAP+
- Part No.:
- MAX350CAP+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX350CAP+.pdf
- Description:
- IC SWITCH SP4T X 2 100OHM 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,693
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Product details
Overview
MAX350CAP+ from Maxim Integrated is a dual 4-channel serially controlled analog multiplexer with bidirectional signal routing, 100Ω max on-resistance (±5V supplies), ±2.7V to ±8V dual or +2.7V to +16V single supply operation, and SPI/QSPI/MICROWIRE-compatible 3-wire interface - used in industrial process control systems for flexible analog signal routing between sensors and ADCs.
For engineers reviewing the MAX350CAP+ datasheet, MAX350CAP+ pinout, MAX350CAP+ application, or MAX350CAP+ equivalent, this page delivers verified electrical specs, daisy-chain timing behavior, rail-to-rail signal handling limits, off-leakage performance at temperature extremes, and real-world selection guidance against functionally aligned alternatives.
Technical Context
The MAX350CAP+ implements two independent 4-to-1 analog multiplexers (COMA/NO0A–NO3A and COMB/NO0B–NO3B) controlled by an 8-bit shift register updated on CS rising edge. Its CMOS switch architecture supports rail-to-rail analog signals across V− to V+, with matched on-resistance (≤16Ω) and flatness (≤10Ω) over ±3V input range.
Serial operation uses synchronous edge-triggered clocking (SCLK rising edge), with DOUT enabling daisy-chaining of multiple devices. RESET asynchronously clears all switches and resets the shift register; logic thresholds (0.8V/2.4V) ensure TTL/CMOS compatibility under ±5V or +5V supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switch Configuration | Dual 4-to-1 SPST multiplexer - enables independent routing of two analog signal paths (e.g., sensor A → ADC A, sensor B → ADC B) |
| On-Resistance (RON) | 100Ω max at ±5V supplies - ensures minimal gain error and voltage drop in precision measurement paths |
| On-Resistance Match | 16Ω max between channels - critical for multi-channel ratiometric measurements where channel-to-channel matching affects accuracy |
| Analog Signal Range | Rail-to-rail: V− to V+ - supports full dynamic range of ±5V, ±3V, or single +5V/+3V systems without level-shifting |
| Off-Leakage Current | 0.1nA at +25°C, 5nA at +85°C - preserves high-impedance sensor node integrity in low-power data acquisition |
| Supply Range | ±2.7V to ±8V dual or +2.7V to +16V single - accommodates legacy industrial rails and modern low-voltage embedded designs |
| Interface Standard | SPI/QSPI/MICROWIRE-compatible 3-wire serial - integrates directly with ARM Cortex-M, PIC, and FPGA GPIO without protocol translation |
Pinout & Package
MAX350CAP+ is housed in a 20-pin SSOP package (20 SSOP), with exposed pad not internally connected. Pin functions are validated per Maxim's MAX350 functional diagram and pin description table (Rev 1, 10/98).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4 | DIN, SCLK, CS, GND | Serial control inputs and digital ground reference - CS must rise to latch new switch states; SCLK rising edge clocks data |
| 5, 10, 16 | COMA, COMB, N.C. | Two independent mux outputs (COMA/COMB); N.C. pin 16 is unconnected - no internal bond wire or circuit tie |
| 6–9, 11–14 | NO0A–NO3A, NO0B–NO3B | Eight normally open analog inputs - bidirectional; either side may serve as source or sink depending on system topology |
| 15, 17, 18, 19, 20 | V−, DOUT, RESET, V+, DOUT | V− sets negative rail; DOUT enables daisy-chain; RESET forces all switches OFF and clears shift register; V+ powers analog/digital sections |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-Rail® signal handling | Supports analog signals from V− to V+ without clipping - eliminates need for external biasing in ±5V sensor front-ends |
| Asynchronous RESET input | Guarantees known-off state at power-up or fault recovery - prevents undefined analog path coupling during initialization |
| Daisy-chainable DOUT | Enables cascaded configuration of multiple MAX350CAP+ units using single CS/SCLK/DIN - reduces MCU GPIO count in multi-mux systems |
| ±2kV ESD protection | Meets Method 3015.7 - protects against field-induced transients in industrial I/O modules and test equipment interfaces |
| TTL/CMOS logic compatibility | 0.8V/2.4V thresholds work with +5V or ±5V supplies - avoids level shifters when interfacing with legacy microcontrollers |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Multiplexing thermocouple, RTD, and pressure sensor outputs into a shared 24-bit sigma-delta ADC in a PLC analog input module. IC Role / Device Role / Timing Role: Dual 4-to-1 analog switch providing isolated signal routing per sensor group; CS-controlled update synchronizes channel changes with ADC conversion start. Use Value: Enables 8-sensor monitoring with one high-resolution ADC, reducing BOM cost and board space while maintaining channel isolation via ≤10Ω RON match. | Use Scenario: Routing calibration reference voltages and DUT signals to precision metrology-grade multimeters and digitizers in benchtop ATE. IC Role / Device Role / Timing Role: Low-leakage analog switch isolating reference sources during measurement cycles; RESET ensures repeatable zero-state before each test sequence. Use Value: 0.1nA off-leakage at +25°C minimizes reference drift errors; rail-to-rail support allows direct connection to ±10V metrology rails. |
| Avionics Sensor Interface | Audio Signal Routing |
Use Scenario: Selecting between redundant air data sensors (pitot/static) and inertial measurement unit (IMU) analog outputs in flight control computers. IC Role / Device Role / Timing Role: Dual mux delivering fail-safe signal redundancy management; operates across −55°C to +125°C (M-grade variant) with guaranteed RON flatness. Use Value: 10Ω max RON flatness over ±3V ensures consistent gain across temperature - critical for airspeed computation accuracy. | Use Scenario: Dynamic routing of microphone preamp outputs, line-level inputs, and DAC outputs in professional audio mixing consoles. IC Role / Device Role / Timing Role: Bidirectional analog switch enabling flexible patchbay functionality; SPI interface allows real-time reconfiguration via DSP host controller. Use Value: 100Ω RON introduces <0.05dB insertion loss at 20kHz into 600Ω audio paths - preserves wideband fidelity without active buffering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-channel analog multiplexer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADG732BRUZ | 32-channel, 16-bit parallel interface; 4Ω typical RON; requires 5V-only supply; no serial daisy-chain capability | Used in high-channel-count, low-RON PCB test fixtures - not suitable for SPI-constrained space-limited designs | Select ADG732BRUZ only when parallel control and sub-5Ω RON outweigh serial interface benefits and supply flexibility |
| TMUX1308PWR | Single 8-channel mux; 4.5Ω typical RON; 1.08V–5.5V supply; I²C interface; no RESET or daisy-chain DOUT | Targeted at battery-powered portable instruments - lacks dual independent paths and industrial temp range | Choose TMUX1308PWR for ultra-low-voltage, I²C-based portable systems where dual-path routing is unnecessary |
Compared with ADG732BRUZ and TMUX1308PWR, MAX350CAP+ uniquely delivers dual independent 4-to-1 routing, SPI daisy-chaining, wide supply range (±2.7V to ±8V), and guaranteed 0.1nA off-leakage - making it optimal for industrial and avionics signal consolidation where reliability, flexibility, and deterministic timing matter.
Availability
MAX350CAP+ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, avionics sensor interfaces, and audio signal routing requiring stable component supply across extended temperature and supply voltage ranges.
Supply support for MAX350CAP+ 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, and communications applications.
The MAX349/MAX350 product line targets serially controlled analog signal routing in space-constrained, noise-sensitive systems - emphasizing rail-to-rail operation, low leakage, and robust digital interface compatibility.
FAQ
What is the maximum allowable analog signal range for MAX350CAP+ when operated with ±5V supplies?
The MAX350CAP+ supports rail-to-rail analog signals from V− to V+, meaning −5V to +5V with ±5V supplies. This is confirmed in the Electrical Characteristics tables (pages 2–3) under "Analog Signal Range" for dual-supply conditions, and applies across the full 0°C to +70°C operating temperature range specified for the CAP+ grade.
Does MAX350CAP+ support daisy-chaining, and how is it implemented?
Yes, MAX350CAP+ supports daisy-chaining via its DOUT pin, which outputs the shifted-in data delayed by eight clock cycles. To chain multiple devices, connect DIN of device N+1 to DOUT of device N, with all CS and SCLK lines tied together. When CS rises, all devices simultaneously update their switch states - a capability explicitly documented in the General Description and Figure 5 of the datasheet.
What is the on-resistance match specification for MAX350CAP+, and why does it matter in precision applications?
The MAX350CAP+ guarantees ≤16Ω on-resistance match (∆RON) between channels at TA = +25°C with ±5V supplies. This tight matching ensures consistent gain and offset across multiplexed channels - essential for ratiometric measurements (e.g., bridge sensor readouts) where mismatch directly contributes to measurement error independent of absolute RON value.
Can MAX350CAP+ operate from a single +3.3V supply, and what are the key trade-offs?
Yes, MAX350CAP+ operates from a single +3.3V supply (within +3.0V to +3.6V range). Key trade-offs include higher on-resistance (600Ω max vs. 100Ω at ±5V) and reduced analog signal range (0V to +3.3V), as shown in the Single +3V Supply Electrical Characteristics (page 8). However, logic thresholds remain compatible, and off-leakage stays below 0.1nA at +25°C.
How does the RESET pin function on MAX350CAP+, and is it required for reliable operation?
The RESET pin on MAX350CAP+ is asynchronous: driving it low forces all switches OFF and resets the internal 8-bit shift register to zero. It is not strictly required for basic operation (power-up defaults to all OFF), but is essential for deterministic recovery after faults, brownouts, or firmware resets - ensuring no unintended analog paths are active during system initialization.
MAX350CAP+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Switch Circuit:
- SP4T
- Multiplexer/Demultiplexer Circuit:
- 4:1
- Number of Circuits:
- 2
- 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
MAX350CAP+ FAQ
1.How can I place an order for MAX350CAP+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX350CAP+ 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 MAX350CAP+ reliable?
The price and inventory of MAX350CAP+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX350CAP+ is usually 5 days.
3.What payment methods are accepted for MAX350CAP+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX350CAP+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX350CAP+?
MAX350CAP+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX350CAP+ 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 MAX350CAP+?
For technical support, including MAX350CAP+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX350CAP+ requirements.
6.How does Aetrix verify that MAX350CAP+ is sourced from the original manufacturer or authorized distributors?
All MAX350CAP+ 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 MAX350CAP+ meets industry standards.
7.What is the process for return or replacement of MAX350CAP+?
All MAX350CAP+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX350CAP+, 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 MAX350CAP+ part is unused and in its original packaging.
Return procedure for MAX350CAP+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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