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Analog Devices Inc./Maxim Integrated MAX6735KAZWD3+
- Part No.:
- MAX6735KAZWD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735KAZWD3+.pdf
- Description:
- TRIPLE-VOLTAGE MICROPROCESSOR SU
- Quantity:
- Payment:
- Shipping:
Inventory:495
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Product details
Overview
The MAX6735KAZWD3+ from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring VCC1 (+2.25V), VCC2 (+2.313V), and an adjustable RSTIN input (626mV threshold). It features push-pull RESET and WDO outputs, 210ms reset timeout, manual reset input, and operates over –40°C to +85°C. Used in multivoltage embedded systems requiring reliable power-on reset and system lockup protection.
For engineers reviewing the MAX6735KAZWD3+ datasheet, MAX6735KAZWD3+ pinout, MAX6735KAZWD3+ application, or MAX6735KAZWD3+ equivalent, key selection criteria include its dual fixed-threshold supervision (+2.25V / +2.313V), adjustable third-channel monitoring capability, push-pull active-low outputs, 14μA typical supply current, and SOT23-8 package compatibility with space-constrained industrial and telecom designs.
Technical Context
The MAX6735KAZWD3+ implements a triple-supply monitoring architecture: two factory-set comparators for VCC1 and VCC2, plus a high-impedance adjustable comparator on RSTIN referenced to an internal 626mV bandgap. Its reset logic asserts RST low when any monitored voltage falls below its threshold or MR is pulled low, holding for 210ms after recovery.
The watchdog subsystem uses a dual-mode timer: 35s minimum startup delay after reset, then transitions to 1.12s minimum normal timeout upon first WDI edge detection. WDO is push-pull active-low and deasserts only when all supplies exceed thresholds and no watchdog fault is pending.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +2.25V (Z suffix), guaranteed over –40°C to +85°C; sets primary supply monitor trip point |
| VCC2 Threshold | +2.313V (W suffix), factory-trimmed for secondary rail supervision |
| RSTIN Threshold | 626mV ±15mV; enables external resistive divider for third-voltage monitoring down to +0.63V |
| Reset Timeout | 210ms (D3 suffix); ensures sufficient hold time for processor initialization after power stabilization |
| Supply Current | 14μA typical at +3.6V; enables battery-backed or ultra-low-power always-on supervision |
| Watchdog Timeout | 1.12s min normal mode; provides rapid system recovery if firmware hangs during runtime |
| Operating Temp | –40°C to +85°C; supports industrial-grade reliability without derating |
Pinout & Package
MAX6735KAZWD3+ is housed in an 8-pin SOT23 package (K8SN+1 outline), footprint-compatible with standard 0.95mm pitch SOT23-8 land patterns (land pattern no. 90-0176). Thermal resistance θJA = 180°C/W enables operation at full rating up to +70°C ambient without heatsinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RST | Active-low reset output | Push-pull driver; asserts low during undervoltage, manual reset, or watchdog timeout; no external pullup required |
| GND | Ground reference | Common return for all internal comparators, timers, and I/O; must be low-impedance connection |
| WDO | Active-low watchdog output | Push-pull driver; independent of RST; signals watchdog expiration or supply fault condition |
| VCC1 | Primary supply input | Powers device and feeds VCC1 threshold comparator; must be ≥+0.8V for valid reset assertion |
| RSTIN | Adjustable reset input | High-impedance (±25nA) comparator input; monitors third rail via external resistor divider referenced to 626mV |
| WDI | Watchdog input | Edge-sensitive input; clears watchdog timer on rising/falling transition; unconnected = default timeout behavior |
| MR | Manual reset input | Active-low; internal 50kΩ pullup to VCC1; forces reset and clears watchdog on assertion |
| VCC2 | Secondary supply input | Feeds VCC2 threshold comparator; powers device if > VCC1; supports dual-rail monitoring |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors VCC1 (+2.25V), VCC2 (+2.313V), and adjustable RSTIN - eliminates need for discrete supervisors or external comparators |
| Independent watchdog output | WDO operates separately from RST, enabling system-level fault isolation (e.g., watchdog-triggered reboot without resetting peripheral controllers) |
| Push-pull RESET/WDO | Eliminates external pullup resistors, reduces BOM count, and ensures defined logic levels under all load conditions |
| Manual reset with glitch rejection | MR accepts 1µs minimum pulse width and rejects <100ns noise spikes - enables robust front-panel or test-point reset without debounce circuitry |
| Low supply current | 14μA typical at +3.6V allows integration into always-on subsystems without compromising battery life or thermal budget |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
Use Scenario: Supervises +2.25V FPGA core rail, +2.313V I/O rail, and +1.2V auxiliary rail via RSTIN divider in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Triple-voltage μP supervisor providing coordinated power-on reset, brownout detection, and watchdog-triggered recovery for real-time control firmware. Use Value: Guarantees deterministic boot sequence and prevents silent firmware lockup during EMI-rich factory floor operation. | Use Scenario: Monitors +2.25V DSP supply, +2.313V PHY interface rail, and +3.3V management MCU supply (via RSTIN divider) on a carrier-grade Ethernet line card. IC Role / Device Role / Timing Role: Fault-detection hub asserting RST to halt data path and WDO to trigger service processor alert on any rail collapse or software hang. Use Value: Enables zero-downtime failover by isolating faults to individual subsystems while maintaining backplane communication integrity. |
| Medical Diagnostic Imaging Module | Automotive ADAS Camera ECU |
Use Scenario: Ensures safe startup and runtime supervision of +2.25V image sensor interface, +2.313V ADC reference, and +1.8V FPGA configuration rail in portable ultrasound equipment. IC Role / Device Role / Timing Role: Safety-critical supervisor enforcing power sequencing compliance and detecting latent firmware errors before image acquisition begins. Use Value: Meets IEC 62304 Class C requirements by guaranteeing reset validity down to VCC = +0.8V and providing traceable watchdog coverage. | Use Scenario: Supervises +2.25V SoC core, +2.313V ISP power domain, and +5V camera lens actuator rail (via RSTIN divider) in an AEC-Q100-compliant vision ECU. IC Role / Device Role / Timing Role: Automotive-grade triple-supply monitor with independent watchdog output supporting ASIL-B functional safety decomposition. Use Value: Reduces system-level FMEDA effort by integrating three critical supervision functions into a single qualified component. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KAZWD3+ | Open-drain RST/WDO outputs; identical VCC1/VCC2 thresholds and RSTIN capability | Requires external pullup resistors; better suited for wired-OR reset bus architectures | Select when system-level reset bus sharing or level-shifting is required |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); no RSTIN or dual fixed thresholds; 200ms timeout | Lacks triple-monitoring capability; requires additional ICs for multirail systems | Select only for simple single-rail applications where cost-per-function outweighs integration benefit |
Compared with MAX6734KAZWD3+, the MAX6735KAZWD3+ offers push-pull outputs eliminating pullup components and simplifying layout, while TPS3808G33DBVR requires supplemental supervision circuitry to match its triple-voltage monitoring and adjustable input functionality.
Availability
MAX6735KAZWD3+ is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, medical imaging modules, and automotive ADAS ECUs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6735KAZWD3+ 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 and mixed-signal ICs for industrial, communications, computing, and automotive markets, with emphasis on high-reliability, low-power, and integrated functionality.
The MAX6730–MAX6735 family delivers compact, multirail microprocessor supervision with independent watchdog outputs - engineered specifically for space-constrained embedded systems demanding deterministic reset behavior and robust fault recovery.
FAQ
What are the exact factory-set reset thresholds for MAX6735KAZWD3+?
The MAX6735KAZWD3+ has VCC1 threshold of +2.25V (Z suffix) and VCC2 threshold of +2.313V (W suffix), both specified over –40°C to +85°C with ±1.5% tolerance. The RSTIN input uses a precise 626mV internal reference, enabling accurate third-rail monitoring via external resistor divider.
Does MAX6735KAZWD3+ support manual reset functionality?
Yes, MAX6735KAZWD3+ includes an active-low manual reset input (MR) with internal 50kΩ pullup to VCC1. Driving MR low forces immediate RST assertion and clears the watchdog timer. MR accepts 1µs minimum pulse width and rejects <100ns glitches, enabling reliable front-panel or test-point reset without external debounce.
What is the reset timeout period of MAX6735KAZWD3+ and how is it configured?
The MAX6735KAZWD3+ has a 210ms nominal reset timeout period (D3 suffix), with guaranteed range of 140ms to 280ms. This timeout is factory-programmed and non-adjustable; it defines the minimum duration RST remains asserted after all monitored voltages recover above their thresholds or after MR release.
How does the watchdog timer operate in MAX6735KAZWD3+?
The MAX6735KAZWD3+ watchdog uses dual-mode timing: 35s minimum startup delay after reset, then transitions to 1.12s minimum normal timeout upon first WDI edge detection. WDO asserts low if no WDI transition occurs within timeout; it deasserts immediately when all supplies are valid and no fault is pending.
What package type and footprint does MAX6735KAZWD3+ use?
MAX6735KAZWD3+ uses an 8-pin SOT23 package (K8SN+1 outline) with 0.95mm pin pitch. Its land pattern (90-0176) is compatible with standard SOT23-8 footprints. Thermal resistance θJA = 180°C/W supports full-rated operation up to +70°C ambient without heatsinking.
MAX6735KAZWD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.665V, 2.313V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6735KAZWD3+ FAQ
1.How can I place an order for MAX6735KAZWD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735KAZWD3+ 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 MAX6735KAZWD3+ reliable?
The price and inventory of MAX6735KAZWD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735KAZWD3+ is usually 5 days.
3.What payment methods are accepted for MAX6735KAZWD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735KAZWD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735KAZWD3+?
MAX6735KAZWD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735KAZWD3+ 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 MAX6735KAZWD3+?
For technical support, including MAX6735KAZWD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735KAZWD3+ requirements.
6.How does Aetrix verify that MAX6735KAZWD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6735KAZWD3+ 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 MAX6735KAZWD3+ meets industry standards.
7.What is the process for return or replacement of MAX6735KAZWD3+?
All MAX6735KAZWD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735KAZWD3+, 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 MAX6735KAZWD3+ part is unused and in its original packaging.
Return procedure for MAX6735KAZWD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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