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Analog Devices Inc./Maxim Integrated MAX6735AKASYD3+T
- Part No.:
- MAX6735AKASYD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735AKASYD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,032
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Product details
Overview
MAX6735AKASYD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring +2.925V (VCC1), +2.188V (VCC2), and an adjustable input down to +0.626V (RSTIN), featuring 210ms reset timeout, push-pull RST/WDO outputs, and manual reset input - deployed in telecom power sequencing and multivoltage embedded controllers.
For engineers reviewing the MAX6735AKASYD3+T datasheet, MAX6735AKASYD3+T pinout, MAX6735AKASYD3+T application, or MAX6735AKASYD3+T equivalent, this page delivers verified electrical thresholds, watchdog timing behavior, reset assertion validity down to VCC = +0.8V, and SOT23-8 package compatibility for industrial-grade system supervision.
Technical Context
The MAX6735AKASYD3+T implements dual-mode watchdog logic: a 35s minimum startup delay after reset enables full system initialization, followed by 1.12s minimum normal-mode timeout on WDI edge detection. Its triple-monitor architecture uses separate internal comparators for VCC1, VCC2, and RSTIN - each with hysteresis and temperature-stable references (20ppm/°C).
Reset assertion is guaranteed valid for VCC1 or VCC2 ≥ +0.8V; RST and WDO are push-pull outputs with VOH ≥ 0.8×VCC1 (ISOURCE = 800µA) and VOL ≤ 0.4V (ISINK = 3.2mA). The 50kΩ internal MR pullup supports direct switch-to-GND connection without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +2.925V nominal (SY suffix), ±1.5% over -40°C to +125°C - sets primary supply brownout detection point for +3.3V rails |
| VCC2 Threshold | +2.188V nominal (SY suffix), ±1.5% - monitors secondary +2.5V or +2.2V domain with 0.5% hysteresis |
| RSTIN Threshold | +626.5mV typical, ±15mV - enables third-supply monitoring via external resistor divider (e.g., +5V, +12V) |
| Reset Timeout | 140ms–280ms (D3 suffix) - ensures sufficient hold time for FPGA configuration or boot ROM initialization |
| Watchdog Timeout | 35s min startup / 1.12s min normal mode - prevents premature lockup during BIOS/post while enabling rapid fault response in runtime |
| Supply Current | 14µA typical at +3.6V - enables battery-backed operation in portable equipment with >10-year shelf life |
| Operating Temp | -40°C to +125°C - qualified for under-hood automotive, industrial PLC, and telecom base station environments |
Pinout & Package
MAX6735AKASYD3+T is housed in an 8-pin SOT23-8 package (K8S-3), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and JEDEC MO-178 compliant outline. Pin 1 marked by dot; lead finish is lead-free (Pb-free).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver; asserts low on VCC1/VCC2/RSTIN undervoltage or MR activation; valid down to VCC = +0.8V |
| 2 - GND | Ground reference | Common return for all analog comparators and digital logic; requires low-impedance PCB plane |
| 3 - VCC2 | Secondary supply input | Monitors +2.188V rail; powers internal comparator for VCC2 threshold detection |
| 4 - WDO | Active-low watchdog output | Push-pull; asserts low if WDI idle >1.12s (normal) or >35s (startup); deasserts immediately when WDI transitions |
| 5 - VCC1 | Primary supply input | Monitors +2.925V rail; powers core logic and VCC1 comparator; dominant supply above VCC2 |
| 6 - RSTIN | Adjustable reset input | High-impedance comparator input referenced to +626.5mV; accepts divided-down voltages up to VCC1 |
| 7 - WDI | Watchdog input | Edge-sensitive; clears watchdog timer on rising/falling transition; floating state maintains active timeout |
| 8 - MR | Active-low manual reset | Internally pulled up to VCC1 (50kΩ); initiates reset and clears watchdog when driven low |
Key Features
| Feature | Design Value |
|---|---|
| Triple independent voltage monitoring | Simultaneous supervision of VCC1 (+2.925V), VCC2 (+2.188V), and RSTIN (adjustable down to +0.626V) eliminates need for discrete supervisors |
| Dual-mode watchdog timer | 35s startup delay allows full system boot before watchdog enforcement; 1.12s runtime timeout detects software hangs within sub-second latency |
| Push-pull RST and WDO outputs | No external pullups required; drives directly into µP reset pins or FPGA CONF_DONE lines with full rail-swing capability |
| Manual reset with integrated pullup | 50kΩ internal MR pullup enables momentary switch-to-GND interface without BOM additions or layout overhead |
| Immunity to short VCC transients | Rejects <45µs falling glitches at 75mV overdrive - prevents spurious resets during switching regulator noise events |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Supervising +3.3V, +2.5V, and +12V rails in carrier-grade Ethernet switches during hot-swap insertion and thermal cycling. IC Role / Device Role / Timing Role: Triple-threshold supervisor asserting coordinated reset across ASIC, PHY, and management MCU upon any rail fault. Use Value: Eliminates discrete RC-based reset generators and reduces board area by 60% versus dual-SOT23 solution. |
Use Scenario: Monitoring field-side +24V DC, isolated +5V logic, and +3.3V FPGA core in programmable logic controller backplane modules. IC Role / Device Role / Timing Role: Fault-detection engine triggering safe shutdown and diagnostic flagging when VCC2 drops below +2.188V during ESD event. Use Value: Guarantees reset validity down to +0.8V supply collapse - critical for deterministic fail-safe behavior in SIL-2 systems. |
| Medical Imaging Sensor Subsystems | Battery-Powered Edge AI Nodes |
Use Scenario: Validating +1.8V image sensor bias, +3.3V ADC reference, and +5V analog front-end in portable ultrasound probes. IC Role / Device Role / Timing Role: Adjustable RSTIN input monitors +5V rail via 7.98kΩ/2.0kΩ divider to trigger reset at +4.95V undervoltage. Use Value: 14µA quiescent current extends single-cell Li-ion runtime beyond 18 months in standby mode. |
Use Scenario: Enabling reliable cold-start and firmware recovery in Cortex-M7-based inference nodes powered by coin-cell + boost converter. IC Role / Device Role / Timing Role: Watchdog enforces 1.12s software liveness check on neural network inference loop; MR supports field technician reset. Use Value: Dual-mode watchdog prevents false triggers during 30s boot sequence while ensuring <1.5s hang detection during inference execution. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734AKASYD3+T | Same pinout and thresholds, but open-drain RST/WDO outputs requiring external pullups | Suitable where level-shifting or wired-OR reset bus is needed; incompatible with direct µP reset pin drive | Select when interfacing with multiple reset sinks or legacy designs using pullup-based reset nets |
| TPS3808G33DBVR | Dual-voltage monitor only (no RSTIN), fixed 3.3V/1.8V thresholds, no manual reset input | Lacks third-supply monitoring and MR functionality - insufficient for triple-rail systems | Choose only for cost-sensitive dual-rail applications where adjustable input and manual reset are unnecessary |
Compared with MAX6734AKASYD3+T, the MAX6735AKASYD3+T eliminates external pullup components and simplifies PCB routing; versus TPS3808G33DBVR, it adds critical RSTIN flexibility and MR support essential for field-serviceable edge devices.
Availability
MAX6735AKASYD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, medical imaging subsystems, and battery-powered edge AI nodes requiring stable component supply across extended temperature ranges.
Supply support for MAX6735AKASYD3+T 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 high-reliability industrial, automotive, and communications systems.
The MAX6730A–MAX6735A family targets multivoltage microprocessor supervision in space-constrained, thermally demanding environments - delivering integrated reset, watchdog, and manual reset in ultra-small SOT23 packages.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6735AKASYD3+T?
The MAX6735AKASYD3+T has factory-set thresholds of +2.925V for VCC1 and +2.188V for VCC2 (SY suffix), with ±1.5% tolerance over -40°C to +125°C and 20ppm/°C tempco. These values are laser-trimmed during production and documented in Maxim's Reset Voltage Threshold Suffix Guide Table 1.
Does the MAX6735AKASYD3+T support monitoring a third voltage higher than +0.626V?
Yes - the MAX6735AKASYD3+T includes RSTIN, a high-impedance input referenced to an internal +626.5mV comparator. By connecting a resistive divider (e.g., 7.98kΩ/2.0kΩ), users can monitor voltages up to VCC1 (e.g., +5V at RSTIN yields +1.25V at divider output, triggering reset at +4.95V).
What is the watchdog timeout behavior of the MAX6735AKASYD3+T during power-up?
The MAX6735AKASYD3+T features dual-mode watchdog timing: after any reset event (power-up, brownout, or MR), it enforces a 35s minimum startup timeout to allow full system initialization, then switches to 1.12s minimum normal-mode timeout upon first WDI edge detection - preventing premature lockup while ensuring rapid fault response.
Can the MAX6735AKASYD3+T operate reliably when VCC1 drops below +1.0V?
Yes - the MAX6735AKASYD3+T guarantees valid reset assertion down to VCC1 or VCC2 = +0.8V. Its internal circuitry remains functional and RST output remains asserted until both supplies exceed their thresholds and the 210ms timeout expires, ensuring deterministic behavior during deep brownouts.
Is the manual reset input (MR) of the MAX6735AKASYD3+T internally pulled up?
Yes - the MAX6735AKASYD3+T integrates a 50kΩ pullup resistor from MR to VCC1. This allows direct connection of a normally-open momentary switch between MR and GND without external components, and permits leaving MR unconnected if manual reset is unused.
MAX6735AKASYD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.188V, 2.925V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6735AKASYD3+T FAQ
1.How can I place an order for MAX6735AKASYD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735AKASYD3+T 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 MAX6735AKASYD3+T reliable?
The price and inventory of MAX6735AKASYD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735AKASYD3+T is usually 5 days.
3.What payment methods are accepted for MAX6735AKASYD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735AKASYD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735AKASYD3+T?
MAX6735AKASYD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735AKASYD3+T 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 MAX6735AKASYD3+T?
For technical support, including MAX6735AKASYD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735AKASYD3+T requirements.
6.How does Aetrix verify that MAX6735AKASYD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6735AKASYD3+T 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 MAX6735AKASYD3+T meets industry standards.
7.What is the process for return or replacement of MAX6735AKASYD3+T?
All MAX6735AKASYD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735AKASYD3+T, 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 MAX6735AKASYD3+T part is unused and in its original packaging.
Return procedure for MAX6735AKASYD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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