My Inquiry
My Account
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:2,473
Please send an inquiry. Send us your inquiry, and we will respond immediately.
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 (±2.7V to ±8V dual or +2.7V to +16V single supply), and <0.1nA off-leakage at +25°C - used in precision data-acquisition systems requiring low crosstalk and high channel isolation.
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, thermal leakage curves, and real-world routing use cases for industrial control and ATE equipment.
Technical Context
The MAX349CAP 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 true bidirectional conduction: COM and NO pins are functionally interchangeable, with matched on-resistance (≤16Ω) and flatness (≤10Ω) over ±3V signal range. Off-isolation exceeds –90dB at 100kHz, and charge injection is ≤100pC - critical for sampled-data integrity in high-resolution ADC front-ends.
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/mux networks. |
| On-resistance match | ≤16Ω between channels - enables accurate ratiometric measurements across multiple input paths. |
| Rail-to-rail analog range | V– to V+ - supports full-supply-swing signals without clipping in single- or dual-supply configurations. |
| Off-leakage current | 0.1nA max at +25°C - preserves accuracy in high-impedance sensor interfaces and sample-hold circuits. |
| Serial interface | SPI/QSPI/MICROWIRE-compatible 3-wire (DIN/SCLK/CS), DOUT enables daisy-chaining of multiple devices. |
| Power supply range | ±2.7V to ±8V dual or +2.7V to +16V single - allows flexible integration into mixed-voltage industrial and test systems. |
| Turn-on/turn-off time | 400ns/300ns typical (dual ±5V) - supports >1MHz multiplexing rates in high-speed data acquisition. |
Pinout & Package
MAX349CAP is housed in a 20-pin SSOP package (0.209" width), RoHS-compliant, with exposed pad not internally connected. Pin 14 is N.C.; pins 10, 15, and 16 are also N.C. per functional diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 SCLK | Serial clock input | Edge-triggered input synchronizing DIN data into internal 8-bit shift register; rising-edge active. |
| 2 V+ | Positive analog supply | Accepts +2.7V to +16V (single) or +4.5V to +5.5V (dual); powers analog switch core and digital logic. |
| 3 DIN | Serial data input | Accepts 8-bit configuration word; D7 first, controls NO0–NO7 switch states independently. |
| 4 GND | Digital ground reference | Logic reference only; analog signals referenced solely to V+ and V–, not GND. |
| 5 COM | Common analog terminal | Bidirectional mux output/input; connects to selected NOx channel when enabled. |
| 6–9, 11–14 NO0–NO7 | Normally open analog inputs/outputs | Bidirectional; each independently controllable via DIN bit; interchangeable with COM. |
| 15 V– | Negative analog supply | Accepts –2.7V to –8V (dual) or 0V (single-supply mode); sets lower analog signal limit. |
| 16 DOUT | Serial data output | Shift register output; data delayed by 8 clocks; enables cascading multiple MAX349CAPs. |
| 17 RESET | Asynchronous reset | Pull low to force all switches OFF and clear shift register to 00000000b - no clock required. |
| 18 CS | Chip select | Active-low; falling edge enables data capture; rising edge latches new switch configuration. |
| 19–20 N.C. | No connect | Pins 19 and 20 are not internally bonded - leave unconnected or grounded per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| 8 independently controlled SPST switches | Each NOx channel can be opened/closed individually via dedicated DIN bit - enables arbitrary channel mapping. |
| Daisy-chainable serial interface | DOUT drives DIN of next device; single SCLK/CS pair controls up to N devices - reduces MCU GPIO count. |
| Rail-to-rail® signal handling | Supports analog signals from V– to V+ without distortion - eliminates level-shifting in ±5V or +12V systems. |
| Break-before-make switching | Guaranteed 1ns minimum tBBM - prevents momentary shorting between channels during reconfiguration. |
| 2kV ESD protection (HBM) | Per Method 3015.7 - enhances robustness in handling-sensitive test and industrial environments. |
| TTL/CMOS-compatible logic thresholds | VIH = 2.4V, VIL = 0.8V at +5V/±5V supplies - interoperable with legacy microcontrollers and FPGAs. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
Use Scenario: Multiplexing thermocouple, RTD, and strain gauge outputs into a shared 24-bit sigma-delta ADC. IC Role / Device Role / Timing Role: Bidirectional analog switch routing sensor signals to common ADC input while maintaining signal integrity and channel isolation. Use Value: 100Ω RON and <0.1nA leakage minimize measurement error; –90dB off-isolation prevents cross-talk between high-impedance sensors. |
Use Scenario: Routing calibration references, DUT signals, and stimulus waveforms within modular PXI chassis. IC Role / Device Role / Timing Role: Precision analog path selector enabling automated self-test sequences and multi-DUT parallel testing. Use Value: 400ns turn-on time supports >1MHz scan rates; daisy-chain capability simplifies firmware control of 16+ mux stages. |
| Avionics Signal Conditioning | Audio Signal Routing |
Use Scenario: Selecting between redundant flight sensor inputs (airspeed, altitude, attitude) before analog-to-digital conversion. IC Role / Device Role / Timing Role: Fail-safe analog multiplexer with asynchronous RESET ensuring known-off state during power-up or fault recovery. Use Value: ±2.7V to ±8V dual-supply operation matches aircraft 28VDC-derived rails; >2kV HBM ESD withstands harsh EM environments. |
Use Scenario: Dynamic routing of line-level audio inputs (mic preamp, instrument, digital source) to DSP or amplifier inputs. IC Role / Device Role / Timing Role: Low-distortion analog switch providing silent channel switching and minimal THD (<0.01% at 1kHz). Use Value: 100pC charge injection prevents audible pop/click; rail-to-rail support handles ±2.5V audio swing without clipping. |
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), SPI interface, but no DOUT daisy-chain capability. | Lacks built-in shift register output - requires external logic or MCU GPIOs for multi-device control. | Preferred when ultra-low on-resistance is critical and system uses discrete control lines or FPGA-based sequencing. |
| TMUX1308PWR | 8-channel mux, 4.5Ω RON, I²C interface, no serial daisy-chain, 1.08V–5.5V supply, no dual-supply support. | Single-supply only; incompatible with ±5V or ±15V analog backplanes; lacks RESET pin. | Selected for low-voltage battery-powered systems where I²C bus sharing is prioritized over analog voltage range. |
Compared with ADG708BRUZ and TMUX1308PWR, the MAX349CAP uniquely combines daisy-chainable SPI control, dual-supply flexibility, asynchronous RESET, and guaranteed break-before-make timing - making it optimal for scalable, high-reliability industrial and aerospace multiplexing architectures.
Availability
MAX349CAP is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, avionics signal conditioning, and audio routing applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
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 family, engineered for high-channel-count, low-error data acquisition and test systems where deterministic timing, low leakage, and supply flexibility are essential.
FAQ
What is the maximum operating temperature range for the MAX349CAP?
The MAX349CAP is rated for operation from 0°C to +70°C, as confirmed in the Ordering Information table. It is the commercial-grade variant (suffix 'C'), distinct from extended (E) or military (M) versions. This range aligns with standard industrial ambient conditions and ensures specified RON, leakage, and timing parameters remain valid throughout the interval.
Does the MAX349CAP support single-supply operation, and what is the minimum voltage?
Yes, the MAX349CAP supports single-supply operation from +2.7V to +16V, with V– tied to GND. At +3.0V supply, on-resistance rises to 600Ω max (per Electrical Characteristics table), and timing slows slightly - but full functionality including rail-to-rail signal handling and serial interface remains operational.
How does the RESET pin function on the MAX349CAP?
The RESET pin on the MAX349CAP is asynchronous and active-low: pulling it low 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 provides deterministic power-up or fault-recovery behavior without requiring clock cycles or serial commands.
Can multiple MAX349CAP devices be connected in series using the DOUT-to-DIN daisy-chain method?
Yes - the DOUT pin outputs the same data shifted in at DIN, delayed by eight SCLK cycles. Connecting DOUT of one MAX349CAP to DIN of the next, with shared SCLK and CS lines, enables synchronous configuration of up to N devices using a single 8×N-bit serial stream. The rising edge of CS updates all devices simultaneously.
Is the MAX349CAP pin-compatible with other variants like MAX349CPN or MAX349CWN?
No - the MAX349CAP uses a 20-pin SSOP package, whereas MAX349CPN is 18-pin PDIP and MAX349CWN is 18-pin wide SO. Pin counts, layouts, and NC pin assignments differ; direct PCB replacement is not possible without board redesign. Functional equivalence exists, but mechanical compatibility does not.
MAX349CAP 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:
- 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.
MAX349CAP Tags
-
SN74LVC1G3157DBVR
Texas Instruments
-
SN74LVC1G66DBVR
Texas Instruments
-
SN74LVC1G66DCKR
Texas Instruments
-
SN74LVC1G3157DSFR
Texas Instruments
-
1P1G3157QDCKRQ1
Texas Instruments
-
SN74LVC2G66DCUR
Texas Instruments
-
SN74LV4052APWR
Texas Instruments
-
74HC4051D,653
Nexperia USA Inc.
-
SN74LV4051APWR
Texas Instruments
-
CD74HC4052PWR
Texas Instruments
-
CD74HC4051PWR
Texas Instruments
-
TS5A3166DBVR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
