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Analog Devices Inc./Maxim Integrated MAX6735KASHD3+T
- Part No.:
- MAX6735KASHD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735KASHD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6735KASHD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring VCC1 (+3.075V nominal), VCC2 (+2.313V nominal), and an adjustable RSTIN input (626mV threshold). It features push-pull RESET and WDO outputs, 140–280ms reset timeout (D3), manual reset input, and operates across –40°C to +85°C. Used in multivoltage embedded systems requiring reliable power-on reset and processor lockup protection.
For engineers reviewing the MAX6735KASHD3+T datasheet, MAX6735KASHD3+T pinout, MAX6735KASHD3+T application, or MAX6735KASHD3+T equivalent, key selection criteria include its triple-supply monitoring capability, push-pull active-low reset and watchdog outputs, factory-set dual fixed thresholds (3.075V/2.313V), adjustable third-input support, and SOT23-8 package compatibility with space-constrained industrial and telecom designs.
Technical Context
The MAX6735KASHD3+T implements three independent voltage monitors: two factory-trimmed comparators for VCC1 and VCC2, plus a high-impedance adjustable comparator on RSTIN referenced to a 626mV internal bandgap. Its dual-mode watchdog timer provides a 35s minimum startup delay after reset and a 1.12s minimum normal-mode timeout, cleared by edges on WDI.
Reset assertion is synchronized to the longest active timeout period (D3 = 140–280ms), with hysteresis of 0.5% and tempco of 20ppm/°C. The push-pull RST and WDO outputs drive loads up to 800µA at VCC1 ≥ 4.5V while maintaining VOL ≤ 0.4V, and guarantee valid reset down to VCC1 or VCC2 = +0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | VCC1/VCC2 = +0.8V to +5.5V - supports brownout detection down to sub-1V logic rails |
| VCC1 Reset Threshold | +3.075V (nominal, S suffix) - factory-trimmed for stable 3.3V I/O rail monitoring |
| VCC2 Reset Threshold | +2.313V (nominal, Z suffix) - factory-trimmed for 2.5V or 2.3V memory/core supply monitoring |
| RSTIN Threshold | +626mV (typical) - enables precise monitoring of third supply via external resistor divider |
| Reset Timeout Period | 140–280ms (D3 option) - ensures sufficient hold time for complex boot sequences |
| Watchdog Startup Delay | 35s (min) after reset - allows full system initialization before watchdog enforcement begins |
| Quiescent Current | 15µA (typ) at +3.6V - minimizes impact on battery-operated or low-power standby modes |
Pinout & Package
SOT23-8 package (8-pin, 1.6mm × 2.9mm footprint), lead(Pb)-free, RoHS compliant, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low push-pull reset output - asserts low on VCC1/VCC2/RSTIN undervoltage or MR activation; no external pullup required |
| 2 | GND | Ground reference - common return for all internal comparators and outputs |
| 3 | VCC2 | Secondary supply input - powers secondary monitor and contributes to device biasing when > VCC1 |
| 4 | MR | Active-low manual reset input - internally pulled up to VCC1 (50kΩ); initiates reset and clears watchdog on assertion |
| 5 | WDI | Watchdog input - edge-sensitive; resets watchdog timer on rising/falling transitions; unconnected requires 100kΩ-to-GND |
| 6 | RSTIN | Adjustable reset comparator input - high-impedance (±25nA), referenced to 626mV; monitors third supply via resistive divider |
| 7 | WDO | Active-low push-pull watchdog output - asserts low on WDI timeout or VCC/RSTIN undervoltage; deasserts immediately on recovery |
| 8 | VCC1 | Primary supply input - powers device and primary monitor; dominant supply when > VCC2 |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneously supervises VCC1 (3.075V), VCC2 (2.313V), and adjustable RSTIN - eliminates need for discrete supervisors in multirail systems |
| Dual-mode watchdog timer | 35s startup delay + 1.12s normal timeout - accommodates long boot sequences while enabling rapid fault response during runtime |
| Push-pull RST/WDO outputs | No external pullups needed - reduces BOM count and PCB area vs. open-drain alternatives; compatible with bidirectional µP reset pins via 10kΩ series resistor |
| Guaranteed reset validity | Operates down to VCC1 or VCC2 = +0.8V - ensures deterministic reset behavior during deep brownout conditions |
| Immunity to VCC transients | Rejects short falling glitches (e.g., <100ns at 100mV overdrive) - prevents spurious resets in noisy power environments |
Applications
| Telecom Power Management | Industrial PLC Controller |
|---|---|
Use Scenario: Monitoring +3.3V control logic, +2.5V FPGA I/O, and +1.2V core supply in a carrier-grade line card with hot-swap capability. IC Role / Device Role / Timing Role: Triple-voltage supervisor providing coordinated reset assertion and independent watchdog supervision of firmware execution. Use Value: Prevents partial initialization failures by holding reset until all three rails stabilize above their thresholds, with D3 timeout ensuring adequate sequencing margin. |
Use Scenario: Supervising +5V analog front-end, +3.3V microcontroller, and +1.8V communication interface in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Centralized reset generator and watchdog enforcer, interfacing directly with ARM Cortex-M4 reset pin and RS-485 transceiver enable. Use Value: Push-pull outputs eliminate pull-up resistors on critical reset paths; MR input enables field-service reset without power cycling. |
| Medical Diagnostic Imaging | Automotive Infotainment Head Unit |
Use Scenario: Ensuring safe boot of FPGA-based image processing subsystem powered by +1.2V core, +2.5V memory, and +3.3V I/O supplies in portable ultrasound equipment. IC Role / Device Role / Timing Role: Fault-tolerant supervisor with adjustable RSTIN used to monitor auxiliary +1.5V sensor bias rail via resistor divider. Use Value: 626mV RSTIN threshold enables accurate monitoring of nonstandard rails; low 15µA quiescent current extends battery life in portable mode. |
Use Scenario: Managing power sequencing and runtime integrity of SoC, DDR memory, and display interface in AEC-Q100-compliant infotainment head unit. IC Role / Device Role / Timing Role: Triple-supply monitor with manual reset and watchdog - interfaces with automotive-grade microcontroller reset pin and safety watchdog circuitry. Use Value: Factory-set 3.075V/2.313V thresholds match typical automotive SoC I/O and memory rails; guaranteed operation to –40°C ensures cold-start reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KASHD3+T | Open-drain RST and WDO outputs; identical VCC1/VCC2 thresholds and RSTIN specs | Requires external pullup resistors; better suited for wired-OR reset buses or level-shifting interfaces | Select when system architecture mandates open-drain reset signaling or shared reset lines with multiple sources |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only), no RSTIN input, no manual reset, 200ms timeout, SOT23-6 | Lacks dual/third-supply monitoring and MR functionality; lower integration for simpler systems | Choose for cost-sensitive, single-rail applications where triple monitoring is unnecessary and board space is extremely constrained |
Compared with MAX6734KASHD3+T and TPS3808G33DBVR, the MAX6735KASHD3+T uniquely delivers triple-supply supervision with push-pull outputs and manual reset in an 8-pin SOT23 - offering highest integration for compact multirail systems requiring deterministic reset timing and robust watchdog coverage.
Availability
MAX6735KASHD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, medical imaging, and automotive infotainment applications requiring stable component supply, long-term lifecycle support, and guaranteed AEC-Q100-compliant sourcing options.
Supply support for MAX6735KASHD3+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 demanding industrial, automotive, and communications applications, emphasizing reliability, low power, and high integration.
The MAX6730–MAX6735 family was engineered for multivoltage microprocessor systems needing coordinated reset generation, brownout immunity, and independent watchdog supervision - targeting space-constrained, high-reliability embedded platforms.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6735KASHD3+T?
The MAX6735KASHD3+T has factory-set VCC1 threshold of +3.075V (S suffix) and VCC2 threshold of +2.313V (Z suffix), with ±1.5% tolerance over temperature. These values are laser-trimmed during production and specified in the Electrical Characteristics table under VTH1 and VTH2 conditions for S and Z codes respectively.
Does the MAX6735KASHD3+T support monitoring a third voltage, and how is it configured?
Yes, the MAX6735KASHD3+T supports third-voltage monitoring via the RSTIN pin, which has a fixed 626mV internal reference. To monitor voltages above 626mV, connect a resistive divider between the target supply and GND, with the midpoint fed to RSTIN - the external threshold is calculated as VEXT_TH = 626mV × (R1 + R2)/R2.
What are the watchdog timeout periods for the MAX6735KASHD3+T, and how do they operate?
The MAX6735KASHD3+T features a dual-mode watchdog: a 35s (minimum) startup delay after any reset event, followed by a 1.12s (minimum) normal-mode timeout. The timer resets on any WDI edge; if no transition occurs within the active timeout, WDO asserts low. Leaving WDI unconnected requires grounding via ≤100kΩ.
Is the MAX6735KASHD3+T pin-compatible with other devices in the MAX6730–MAX6735 family?
The MAX6735KASHD3+T uses the SOT23-8 package and shares identical pinout with MAX6734 variants, but differs from MAX6730–MAX6733 (SOT23-6). Within the SOT23-8 group, MAX6734/MAX6735 share pin mapping, though MAX6734 offers open-drain outputs while MAX6735 provides push-pull - not functionally interchangeable without layout changes.
What is the operating temperature range and package type of the MAX6735KASHD3+T?
The MAX6735KASHD3+T is specified for operation from –40°C to +85°C and is supplied in an 8-pin SOT23 package (K8SN+1 outline), lead(Pb)-free and RoHS compliant. Thermal resistance is θJA = 180°C/W and θJC = 60°C/W per JEDEC JESD51-7 on a four-layer board.
MAX6735KASHD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 1.313V, 2.925V, Adj
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6735KASHD3+T FAQ
1.How can I place an order for MAX6735KASHD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735KASHD3+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 MAX6735KASHD3+T reliable?
The price and inventory of MAX6735KASHD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735KASHD3+T is usually 5 days.
3.What payment methods are accepted for MAX6735KASHD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735KASHD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735KASHD3+T?
MAX6735KASHD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735KASHD3+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 MAX6735KASHD3+T?
For technical support, including MAX6735KASHD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735KASHD3+T requirements.
6.How does Aetrix verify that MAX6735KASHD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6735KASHD3+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 MAX6735KASHD3+T meets industry standards.
7.What is the process for return or replacement of MAX6735KASHD3+T?
All MAX6735KASHD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735KASHD3+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 MAX6735KASHD3+T part is unused and in its original packaging.
Return procedure for MAX6735KASHD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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