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Analog Devices Inc./Maxim Integrated MAX6735AKAWGD3+
- Part No.:
- MAX6735AKAWGD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735AKAWGD3+.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:596
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Product details
Overview
MAX6735AKAWGD3+ from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring +3.075V (VCC1), +1.665V (VCC2), and an adjustable input down to +0.626V (RSTIN), featuring 280ms reset timeout, push-pull RST/WDO outputs, and manual reset input - used in multivoltage embedded systems requiring reliable power-on reset and lockup recovery.
For engineers reviewing the MAX6735AKAWGD3+ datasheet, MAX6735AKAWGD3+ pinout, MAX6735AKAWGD3+ application, or MAX6735AKAWGD3+ equivalent, this page delivers verified electrical parameters, thermal operating range (-40°C to +125°C), SOT23-8 package mapping, and real-world substitution guidance for industrial and telecom power supervision designs.
Technical Context
The MAX6735AKAWGD3+ implements dual-mode watchdog logic: a 35s minimum startup delay after reset enables full system initialization, followed by 1.12s minimum normal-mode timeout for rapid fault detection. Its three-supply monitoring architecture uses factory-set VCC1/VCC2 thresholds and a high-impedance RSTIN comparator referenced to a stable 626mV internal reference.
Reset assertion is guaranteed valid down to VCC1 or VCC2 = +0.8V, with immunity to sub-100ns VCC transients and 45µs VCC-to-RST propagation delay. The push-pull RST and WDO outputs drive loads directly without external pullups, supporting bidirectional µP reset pins via optional 10kΩ series isolation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +3.075V nominal (T suffix), ±1.5% tolerance over -40°C to +125°C - sets primary supply monitor for 3.3V rail supervision |
| VCC2 Threshold | +1.665V nominal (W suffix), ±1.5% tolerance - configures secondary monitor for 1.8V core or I/O rail |
| RSTIN Threshold | +626.5mV typical, ±15mV - enables third-rail monitoring (e.g., 1.2V, 1.0V) via external resistor divider |
| Reset Timeout | 140ms to 280ms (D3 suffix) - ensures sufficient hold time for slow-starting peripherals during power-up |
| Watchdog Timeout | 35s min initial period, 1.12s min normal period - accommodates boot sequences then enforces tight software execution checks |
| Supply Current | 14µA typical at +3.6V - enables battery-backed operation in portable equipment with minimal quiescent drain |
| Operating Temp | -40°C to +125°C - supports under-hood automotive, industrial control, and telecom base station environments |
Pinout & Package
MAX6735AKAWGD3+ is housed in an 8-pin SOT23-8 package (K8S-3), measuring 3.00mm × 1.75mm × 1.30mm, with gull-wing leads and JEDEC MO-178 compliant outline. Pin 1 is marked by a dot; leads are lead-free (RoHS-compliant) with standard tin plating.
| 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; no external pullup required |
| 2 - GND | Ground reference | Common return for all analog and digital circuitry; must be low-impedance connection to system ground plane |
| 3 - VCC2 | Secondary supply input | Monitors second voltage rail (here +1.665V); powers internal comparator for VCC2 threshold detection |
| 4 - WDO | Active-low watchdog output | Push-pull driver; asserts low if WDI lacks edge within timeout; deasserts immediately when valid WDI transition occurs |
| 5 - VCC1 | Primary supply input | Monitors main rail (here +3.075V); powers device core and VCC1 threshold comparator |
| 6 - RSTIN | Adjustable reset input | High-impedance comparator input (626mV ref); accepts divided-down voltages for third-rail monitoring |
| 7 - WDI | Watchdog input | Edge-sensitive input; rising/falling transitions reset watchdog timer; floating state does not disable function |
| 8 - MR | Active-low manual reset | CMOS-compatible input with 50kΩ internal pullup; forces reset when pulled low; debounced internally |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneously supervises VCC1 (+3.075V), VCC2 (+1.665V), and RSTIN (adjustable down to +0.626V) - eliminates need for multiple discrete supervisors |
| Dual-mode watchdog | 35s startup delay allows full firmware initialization before watchdog enforcement begins; 1.12s normal timeout detects runtime hangs rapidly |
| Push-pull RST/WDO outputs | Eliminates external pullup resistors and reduces BOM count; compatible with bidirectional µP reset pins using 10kΩ series isolation |
| Guaranteed reset validity | Operates and asserts valid reset down to VCC1 or VCC2 = +0.8V - ensures robust brownout response even during deep undervoltage |
| Low-power design | 14µA typical supply current at +3.6V - extends battery life in portable equipment and enables always-on supervision |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
|
Use Scenario: Supervises 3.3V FPGA configuration rail, 1.8V transceiver core, and 1.2V ADC reference in a field-deployed programmable logic controller. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting synchronized reset across FPGA, PHY, and data converter subsystems during cold start or brownout. Use Value: Prevents partial initialization and metastability by holding all domains in reset until all rails exceed their precise thresholds (±1.5%) and remain stable for 280ms. |
Use Scenario: Monitors +3.3V management processor supply, +1.8V SerDes core, and +1.0V LDO output in a carrier-grade optical line card. IC Role / Device Role / Timing Role: Independent watchdog output triggers hardware reset of management CPU if firmware fails to toggle WDI within 1.12s, while RSTIN tracks critical LDO stability. Use Value: Enables autonomous recovery from software lockup without host intervention, reducing MTTR in unattended infrastructure deployments. |
| Medical Imaging Sensor Module | Automotive ADAS Camera ECU |
|
Use Scenario: Ensures safe power-up sequencing for a low-noise CMOS image sensor with separate analog (+2.8V), digital (+1.8V), and reference (+1.2V) supplies. IC Role / Device Role / Timing Role: Uses RSTIN to monitor precision 1.2V reference rail via resistor divider; asserts reset if reference deviates >0.5% from nominal. Use Value: Guarantees image integrity by preventing sensor operation unless all supplies - especially noise-sensitive reference - meet strict accuracy requirements. |
Use Scenario: Supervises 5V camera module power, 3.3V SoC I/O, and 1.2V vision processor core in an AEC-Q100 qualified automotive camera ECU. IC Role / Device Role / Timing Role: Push-pull RST drives SoC reset pin directly; watchdog monitors vision algorithm execution loop timing in real-time. Use Value: Meets ASIL-B functional safety requirements by detecting both power faults (via triple-rail monitoring) and software anomalies (via dual-mode watchdog). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734AKAWGD3+ | Same pinout and thresholds, but open-drain RST/WDO outputs require external pullups | Suitable where level-shifting or wired-OR reset bus is needed; incompatible with direct-drive µP reset pins | Select when system requires shared reset bus or compatibility with legacy open-drain designs |
| TPS3808G33DBVR | Single-supply supervisor only; no RSTIN input or dual-voltage monitoring; 3.3V fixed threshold; 200ms timeout | Limited to single-rail applications; lacks triple-monitoring capability and adjustable input | Choose only for cost-sensitive single-rail designs where VCC1/VCC2/RSTIN functionality is unnecessary |
Compared with MAX6734AKAWGD3+, the MAX6735AKAWGD3+ eliminates external pullups and simplifies PCB layout; versus TPS3808G33DBVR, it provides essential triple-rail supervision and watchdog independence required for complex embedded systems.
Availability
MAX6735AKAWGD3+ 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 MAX6735AKAWGD3+ 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 MAX6730A–MAX6735A family was engineered specifically for high-reliability multivoltage microprocessor supervision, integrating triple-rail monitoring, dual-mode watchdog, and push-pull outputs into space-constrained SOT23 packages.
FAQ
What is the exact reset threshold voltage for VCC1 on MAX6735AKAWGD3+?
The MAX6735AKAWGD3+ has a VCC1 reset threshold of +3.075V nominal (T suffix), with a guaranteed range of +3.000V to +3.150V over -40°C to +125°C. This value is factory-trimmed and specified in the Electrical Characteristics table under VTH1 parameter with T falling-edge code. The threshold remains stable with ±20ppm/°C tempco.
Does MAX6735AKAWGD3+ support monitoring a 1.0V supply rail?
Yes, MAX6735AKAWGD3+ supports 1.0V rail monitoring via its RSTIN pin. With a fixed internal reference of +626.5mV, a simple two-resistor divider (e.g., R1 = 604kΩ, R2 = 1MΩ) scales the 1.0V input to ~626mV at RSTIN. The device guarantees RSTIN input current ≤ ±100nA, enabling high-value resistors that minimize power loss.
What is the watchdog startup behavior after power-on reset for MAX6735AKAWGD3+?
After power-on reset, MAX6735AKAWGD3+ enters a 35s minimum initial watchdog mode (tWD-L), allowing full system boot before watchdog enforcement begins. Once the first valid WDI edge occurs, it switches to 1.12s minimum normal timeout (tWD-S). This dual-mode architecture prevents false timeouts during lengthy initialization sequences.
Can MAX6735AKAWGD3+ operate with VCC1 = 2.5V and still assert valid reset?
Yes, MAX6735AKAWGD3+ guarantees valid reset operation down to VCC1 = +0.8V. At VCC1 = 2.5V, all functions - including RST assertion, WDO control, and RSTIN comparison - remain fully specified. The push-pull outputs maintain VOH ≥ 0.8 × VCC1 and VOL ≤ 0.4V across the full 0.8V–5.5V supply range.
How does the manual reset (MR) input interact with the watchdog timer in MAX6735AKAWGD3+?
Driving MR low on MAX6735AKAWGD3+ immediately clears the watchdog timer, deasserts WDO, and forces RST low for the full 280ms timeout period. This provides deterministic system reset regardless of watchdog state. MR has an internal 50kΩ pullup, so leaving it unconnected defaults to inactive (high) state.
MAX6735AKAWGD3+ 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:
- 1.11V, 1.665V, 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
MAX6735AKAWGD3+ FAQ
1.How can I place an order for MAX6735AKAWGD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735AKAWGD3+ 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 MAX6735AKAWGD3+ reliable?
The price and inventory of MAX6735AKAWGD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735AKAWGD3+ is usually 5 days.
3.What payment methods are accepted for MAX6735AKAWGD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735AKAWGD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735AKAWGD3+?
MAX6735AKAWGD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735AKAWGD3+ 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 MAX6735AKAWGD3+?
For technical support, including MAX6735AKAWGD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735AKAWGD3+ requirements.
6.How does Aetrix verify that MAX6735AKAWGD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6735AKAWGD3+ 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 MAX6735AKAWGD3+ meets industry standards.
7.What is the process for return or replacement of MAX6735AKAWGD3+?
All MAX6735AKAWGD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735AKAWGD3+, 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 MAX6735AKAWGD3+ part is unused and in its original packaging.
Return procedure for MAX6735AKAWGD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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