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Analog Devices Inc./Maxim Integrated MAX6735AKAZID3+T
- Part No.:
- MAX6735AKAZID3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735AKAZID3+T.pdf
- Description:
- IC SUPERVISOR MPU W/WD SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,260
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Product details
Overview
MAX6735AKAZID3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring two factory-set supply rails (VCC1 = +3.075V, VCC2 = +0.788V) and one adjustable input (RSTIN = 626mV threshold), featuring push-pull RESET/WDO outputs, 210ms reset timeout, and operation from -40°C to +125°C. It ensures system reliability in multivoltage embedded controllers requiring precise brownout detection and fail-safe watchdog supervision.
For engineers reviewing the MAX6735AKAZID3+T datasheet, MAX6735AKAZID3+T pinout, MAX6735AKAZID3+T application, or MAX6735AKAZID3+T equivalent, key selection criteria include its triple-supply monitoring capability, push-pull active-low reset and watchdog outputs, 210ms factory-programmed reset timeout, guaranteed reset validity down to VCC = +0.8V, and SOT23-8 package compatibility with space-constrained industrial and telecom designs.
Technical Context
The MAX6735AKAZID3+T implements a dual-mode watchdog timer with a 35s minimum startup delay after reset and a 1.12s minimum normal-mode timeout, enabling robust boot sequence handling and rapid fault detection during runtime. Its internal 626mV reference drives the RSTIN comparator, supporting external voltage-divider-based monitoring of third supplies up to +5.5V.
It features separate, independently asserted open-drain or push-pull outputs for RESET and WDO - here both are push-pull - with guaranteed low-voltage operation (VOL ≤ 0.4V at ISINK = 3.2mA, VOH ≥ 0.8×VCC1 at ISOURCE = 800µA), and immunity to short VCC transients via built-in glitch rejection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +3.075V (factory-set falling threshold; monitors primary supply with ±1.5% tolerance) |
| VCC2 Reset Threshold | +0.788V (factory-set falling threshold; monitors secondary supply with ±1.5% tolerance) |
| RSTIN Threshold | +626mV (internal reference; enables adjustable third-supply monitoring via resistive divider) |
| Reset Timeout Period | 140ms to 280ms (D3 suffix; guarantees minimum 210ms assertion time for reliable µP initialization) |
| Watchdog Timeout | 1.12s min normal mode; 35s min startup delay (prevents false timeouts during power-up or recovery) |
| Supply Current | 14µA typical at +3.6V (ultra-low quiescent current enables battery-backed and portable applications) |
| Operating Temperature | -40°C to +125°C (fully specified for under-hood automotive, industrial control, and telecom base station use) |
Pinout & Package
MAX6735AKAZID3+T 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. The package supports reflow soldering and provides thermal performance suitable for high-density PCB layouts.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output; asserts when VCC1/VCC2/RSTIN drop below thresholds or MR is pulled low; no external pullup required |
| 2 | GND | Analog/digital ground reference; must be connected to system ground plane for stable threshold accuracy |
| 3 | VCC2 | Secondary supply input; powers internal circuitry when > VCC1; monitored at +0.788V threshold |
| 4 | MR | Active-low manual reset input; internally pulled up to VCC1 (50kΩ); initiates full reset and clears watchdog on assertion |
| 5 | WDI | Watchdog input; requires periodic edge transitions (rising/falling) within 1.12s to prevent WDO assertion |
| 6 | VCC1 | Primary supply input; powers device when > VCC2; monitored at +3.075V threshold |
| 7 | RSTIN | Adjustable reset comparator input; referenced to 626mV internal bandgap; accepts divided-down voltages up to VCC1 |
| 8 | WDO | Active-low push-pull watchdog output; asserts if WDI stalls >1.12s (normal mode) or >35s (startup mode) |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneously supervises VCC1 (+3.075V), VCC2 (+0.788V), and RSTIN (626mV reference) - eliminates need for three discrete supervisors |
| Push-pull RESET and WDO outputs | Eliminates external pullup resistors, reduces BOM count, and ensures fast, rail-to-rail logic-level drive without I²C bus contention |
| Dual-mode watchdog timer | 35s startup delay prevents premature timeout during boot; 1.12s normal timeout delivers rapid lockup detection during firmware execution |
| Guaranteed reset down to VCC = +0.8V | Ensures valid reset assertion even during deep brownout conditions, critical for nonvolatile memory write protection and safe shutdown |
| Immunity to short VCC transients | Rejects sub-100ns glitches (per Typical Operating Characteristics), preventing spurious resets in noisy power environments |
Applications
| Industrial PLC Controller | Telecom Line Card |
|---|---|
Use Scenario: Monitors core logic voltage (+3.3V), I/O bank voltage (+1.8V), and FPGA configuration rail (+1.2V) in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting synchronized reset across CPU, FPGA, and peripheral interfaces during undervoltage events. Use Value: Prevents partial state corruption by ensuring all domains reset simultaneously when any rail drops below specification, leveraging 210ms timeout for deterministic firmware reload. |
Use Scenario: Supervises +48V DC-DC converter output, +3.3V management MCU supply, and +1.2V SerDes core voltage in a carrier-grade Ethernet line card. IC Role / Device Role / Timing Role: Provides independent watchdog supervision of the management processor while monitoring three critical power domains for hot-swap compliance. Use Value: Enables autonomous recovery from software hangs without host intervention, using push-pull WDO to directly trigger board-level reset sequencing. |
| Automotive Infotainment Head Unit | Medical Patient Monitor |
Use Scenario: Tracks +5V main supply, +3.3V SoC domain, and +1.1V GPU core voltage in an AEC-Q200–qualified infotainment module operating under engine cranking conditions. IC Role / Device Role / Timing Role: Brownout detector with extended temperature range (-40°C to +125°C) and glitch-immune reset generation for ARM-based application processor. Use Value: Maintains reset validity down to VCC = +0.8V, ensuring safe shutdown during severe battery sag (<6V cranking), avoiding corrupted display buffers or audio artifacts. |
Use Scenario: Supervises +3.3V microcontroller supply, +2.5V ADC reference, and +1.8V sensor interface rail in a Class II medical device requiring continuous uptime and fault logging. IC Role / Device Role / Timing Role: Triple-supply monitor with manual reset button integration and watchdog-triggered fault flagging for regulatory event recording. Use Value: Combines MR-initiated calibration reset and WDO-driven fault interrupt in a single IC, reducing component count while meeting IEC 62304 safety requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734AKAZID3+T | Same pinout and thresholds, but open-drain RST/WDO outputs requiring external pullups | Suitable where level-shifting or wired-OR reset buses are needed; incompatible with direct push-pull logic interfacing | Select when system design mandates open-drain reset arbitration or shares RST bus with multiple devices |
| TPS3808G33DBVR | Dual-supply monitor only (no RSTIN), fixed 3.3V VDD threshold, 200ms timeout, SOT23-6 package | Lacks third-supply monitoring and manual reset; lower pin count but reduced flexibility for complex multirail systems | Choose for cost-sensitive, dual-rail applications where RSTIN functionality is unnecessary and board space permits SOT23-6 |
Compared with MAX6735AKAZID3+T, the MAX6734AKAZID3+T offers identical monitoring but requires external pullups due to open-drain outputs, while the TPS3808G33DBVR reduces feature set and package size at the expense of triple-supply capability - making MAX6735AKAZID3+T optimal for compact, high-integrity multivoltage systems demanding push-pull drive and manual reset.
Availability
MAX6735AKAZID3+T is available at Aetrix Electronics and suitable for industrial control systems, telecom infrastructure equipment, and automotive electronics requiring stable component supply, long-term lifecycle support, and guaranteed -40°C to +125°C operation.
Supply support for MAX6735AKAZID3+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX6730A–MAX6735A family was designed specifically for multivoltage microprocessor systems needing integrated triple-supply monitoring, independent watchdog supervision, and guaranteed reset behavior across extreme temperatures.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6735AKAZID3+T?
The MAX6735AKAZID3+T has a factory-set VCC1 reset threshold of +3.075V (falling), with ±1.5% tolerance over temperature. This value is encoded in the "Z" suffix per Maxim's Reset Voltage Threshold Suffix Guide and is fully specified from -40°C to +125°C. The threshold is derived from an internal precision bandgap reference and remains stable with 20ppm/°C tempco.
Does the MAX6735AKAZID3+T support manual reset functionality?
Yes, the MAX6735AKAZID3+T includes an active-low manual reset input (MR) on Pin 4. It features an internal 50kΩ pullup resistor to VCC1, allowing direct connection of a momentary switch to GND. Asserting MR low forces immediate RST assertion and clears the watchdog timer, with reset held for the full 210ms timeout period after MR release.
What is the function of the RSTIN pin on the MAX6735AKAZID3+T?
The RSTIN pin (Pin 7) on the MAX6735AKAZID3+T is a high-impedance comparator input referenced to an internal 626mV threshold. It enables monitoring of a third supply voltage - such as a core rail or sensor bias - using an external resistive divider. The MAX6735AKAZID3+T asserts RST low if the voltage at RSTIN falls below 626mV, providing true triple-supply supervision.
How does the watchdog timer operate on the MAX6735AKAZID3+T?
The MAX6735AKAZID3+T implements a dual-mode watchdog timer: a 35s minimum startup delay after reset (to accommodate boot sequences), followed by a 1.12s minimum normal-mode timeout. A rising or falling edge on WDI (Pin 5) resets the timer; failure to provide such an edge within the timeout causes WDO (Pin 8) to assert low. WDO is push-pull and requires no external components.
Is the MAX6735AKAZID3+T compatible with lead-free assembly processes?
Yes, the MAX6735AKAZID3+T is offered in lead-free packaging, indicated by the "+T" suffix. It complies with RoHS Directive 2011/65/EU and is qualified for standard Pb-free reflow profiles (J-STD-020). The SOT23-8 package uses matte tin plating and supports peak reflow temperatures up to +260°C for 30 seconds.
MAX6735AKAZID3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.388V, 2.313V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6735AKAZID3+T FAQ
1.How can I place an order for MAX6735AKAZID3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735AKAZID3+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 MAX6735AKAZID3+T reliable?
The price and inventory of MAX6735AKAZID3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735AKAZID3+T is usually 5 days.
3.What payment methods are accepted for MAX6735AKAZID3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735AKAZID3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735AKAZID3+T?
MAX6735AKAZID3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735AKAZID3+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 MAX6735AKAZID3+T?
For technical support, including MAX6735AKAZID3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735AKAZID3+T requirements.
6.How does Aetrix verify that MAX6735AKAZID3+T is sourced from the original manufacturer or authorized distributors?
All MAX6735AKAZID3+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 MAX6735AKAZID3+T meets industry standards.
7.What is the process for return or replacement of MAX6735AKAZID3+T?
All MAX6735AKAZID3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735AKAZID3+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 MAX6735AKAZID3+T part is unused and in its original packaging.
Return procedure for MAX6735AKAZID3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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