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Analog Devices Inc./Maxim Integrated MAX6735KAZWD3+T
- Part No.:
- MAX6735KAZWD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735KAZWD3+T.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:17,500
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Product details
Overview
The MAX6735KAZWD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring VCC1 (+2.25V nominal), VCC2 (+1.11V nominal), and an adjustable RSTIN input (626mV threshold). It features push-pull RESET and WDO outputs, 210ms reset timeout, and operates across –40°C to +85°C. Used in multivoltage embedded systems requiring reliable power-on reset and system lockup prevention.
For engineers reviewing the MAX6735KAZWD3+T datasheet, MAX6735KAZWD3+T pinout, MAX6735KAZWD3+T application, or MAX6735KAZWD3+T equivalent, key selection criteria include its triple-supply monitoring capability, push-pull active-low reset and watchdog outputs, factory-set dual fixed thresholds (Z/V suffix), adjustable third threshold, 210ms timeout (D3), and SOT23-8 package compatibility with space-constrained industrial and telecom designs.
Technical Context
The MAX6735KAZWD3+T implements a triple-threshold supervisory architecture: two factory-trimmed comparators for VCC1 (2.25V ±37.5mV) and VCC2 (1.11V ±30mV), plus a high-impedance RSTIN comparator referenced to an internal 626mV bandgap. Its dual-mode watchdog timer provides a 35s minimum startup delay after reset and a 1.12s minimum normal-mode timeout.
Reset assertion is triggered by undervoltage on any monitored rail or manual reset (MR), with guaranteed validity down to VCC1/VCC2 = +0.8V. The push-pull RST and WDO outputs eliminate external pullups and support direct interfacing to μP reset I/O pins-though a 10kΩ series resistor is recommended for bidirectional μP reset ports to prevent contention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 2.25V (Z suffix), ±37.5mV tolerance - sets primary supply monitor level for +2.25V rails |
| VCC2 Reset Threshold | 1.11V (G suffix), ±30mV tolerance - sets secondary supply monitor level for +1.11V rails |
| RSTIN Threshold | 626mV (±15.5mV), high-impedance input - enables monitoring of third voltage via external divider |
| Reset Timeout Period | 210ms (D3 suffix, typ), 140–280ms range - defines minimum reset pulse width after recovery |
| Watchdog Timeout | 35s min startup, 1.12s min normal mode - prevents lockup during boot and runtime |
| Supply Current | 14µA typ at +3.6V - enables ultra-low-power operation in battery-backed systems |
| Operating Temp | –40°C to +85°C - supports industrial-grade reliability without derating |
| Package | SOT23-8 - surface-mount, 2.9mm × 1.6mm footprint for dense PCB layouts |
Pinout & Package
SOT23-8 package: 2.9mm × 1.6mm × 1.1mm body, gull-wing leads, RoHS-compliant lead(Pb)-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low push-pull reset output | Drives low during fault conditions; no external pullup required; asserts for full timeout period |
| 2 - GND | Ground reference | Common return path for all internal circuits and external monitoring dividers |
| 3 - VCC2 | Secondary supply voltage input | Power source and monitored rail for second fixed threshold (1.11V) |
| 4 - MR | Active-low manual reset input | Forced reset initiation; internal 50kΩ pullup to VCC1; 1µs minimum pulse width |
| 5 - WDI | Watchdog input | Edge-sensitive trigger; clears watchdog timer on rising/falling transitions; unconnected = functional |
| 6 - RSTIN | Adjustable reset comparator input | High-Z input referenced to 626mV; monitors third rail via resistive divider |
| 7 - WDO | Active-low push-pull watchdog output | Asserts low on watchdog timeout or undervoltage; no external pullup needed |
| 8 - VCC1 | Primary supply voltage input | Power source and monitored rail for first fixed threshold (2.25V); powers internal circuitry |
Key Features
| Feature | Design Value |
|---|---|
| Triple-supply monitoring | Simultaneously supervises VCC1, VCC2, and RSTIN - eliminates need for three discrete supervisors |
| Push-pull RST/WDO outputs | Eliminates external pullup resistors and reduces BOM count vs. open-drain alternatives |
| Dual-mode watchdog timer | 35s startup delay enables full system initialization before watchdog enforcement begins |
| Guaranteed reset down to 0.8V | Ensures valid reset assertion even during brownout conditions where VCC drops below 1.0V |
| Immunity to short VCC transients | Rejects glitches <100ns duration - prevents spurious resets in noisy power environments |
| Low 14µA supply current | Minimizes quiescent load on backup batteries or low-power standby rails |
Applications
| Industrial PLC Control | Telecom Line Card |
|---|---|
Use Scenario: Monitoring +2.25V core logic, +1.11V I/O buffer, and +3.3V auxiliary rail in programmable logic controller backplane modules. IC Role / Device Role / Timing Role: Triple-rail supervisor providing coordinated reset and watchdog supervision for ARM-based control processors. Use Value: Prevents silent firmware corruption by detecting simultaneous undervoltage on multiple rails and asserting reset within 210ms. | Use Scenario: Supervising +2.25V DSP core, +1.11V SerDes PHY, and adjustable +1.8V analog front-end supply in optical line cards. IC Role / Device Role / Timing Role: Fault-detection engine ensuring deterministic reboot after power sequencing failures or thermal shutdown events. Use Value: Dual-mode watchdog (35s boot window + 1.12s runtime) avoids false triggers during long FPGA configuration sequences. |
| Medical Diagnostic Imaging | Network Router Management Module |
Use Scenario: Validating +2.25V FPGA fabric, +1.11V DDR3 interface, and +5V sensor bias supply in portable ultrasound subsystems. IC Role / Device Role / Timing Role: Safety-critical power integrity monitor enforcing reset if any rail deviates beyond ±1.7% of nominal. Use Value: 20ppm/°C tempco and 0.5% hysteresis ensure stable trip points across –40°C to +85°C operating range. | Use Scenario: Managing power sequencing and lockup detection for ARM Cortex-A9 management CPU and associated PMIC in enterprise routers. IC Role / Device Role / Timing Role: System-level watchdog coordinator that forces hardware reset when software fails to service WDI. Use Value: Push-pull WDO output directly drives MR input of companion supervisor or processor reset pin without level-shifting. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KAZWD3+T | Open-drain RST/WDO outputs; identical thresholds, timeout, and pinout | Requires external pullup resistors; suitable where bus-wired reset sharing is needed | Select when system-level reset bus architecture mandates open-drain drive |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); no adjustable RSTIN or dual fixed thresholds | Lacks triple-monitoring capability; limited to single-rail applications | Choose only for cost-sensitive single-voltage designs where RSTIN and VCC2 monitoring are unnecessary |
Compared with MAX6734KAZWD3+T, the MAX6735KAZWD3+T offers push-pull drive for lower system component count; versus TPS3808G33DBVR, it delivers triple-rail supervision and adjustable threshold capability essential for modern multivoltage SoC platforms.
Availability
MAX6735KAZWD3+T is available at Aetrix Electronics and suitable for industrial PLC control, telecom line card design, medical imaging subsystems, network router management modules, and portable diagnostic equipment requiring stable component supply across extended temperature ranges.
Supply support for MAX6735KAZWD3+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 industrial, automotive, and communications markets, with expertise in power management and system supervision.
The MAX6730–MAX6735 family was engineered for multivoltage microprocessor-based systems needing coordinated reset, manual reset, and independent watchdog functionality in minimal footprints.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6735KAZWD3+T?
The MAX6735KAZWD3+T has a VCC1 reset threshold of 2.25V (Z suffix), with a guaranteed range of 2.213V to 2.288V at +25°C and ±20ppm/°C tempco. This value is factory-trimmed and applies specifically to the Z-coded variant in the MAX6735 family.
Does the MAX6735KAZWD3+T support monitoring a third voltage higher than 626mV?
Yes, the MAX6735KAZWD3+T supports monitoring voltages above 626mV using the RSTIN pin. Connect a resistive voltage divider between the target supply and ground, with the divider's midpoint fed to RSTIN. The internal 626mV reference determines the trip point: VEXT_TH = 626mV × (R1 + R2)/R2.
What is the function of the MR pin on the MAX6735KAZWD3+T?
The MR (Manual Reset) pin on the MAX6735KAZWD3+T is an active-low input that forces the RST output low when asserted. It clears the watchdog timer and initiates reset regardless of supply voltage status. An internal 50kΩ pullup to VCC1 allows MR to be left floating if unused.
How does the watchdog timer behave during power-up of the MAX6735KAZWD3+T?
Upon power-up or reset, the MAX6735KAZWD3+T watchdog timer enters a 35s minimum startup delay before enforcing the normal 1.12s timeout. This extended initial period allows complete system initialization-including bootloader execution and peripheral configuration-before watchdog supervision begins.
Is the MAX6735KAZWD3+T compatible with bidirectional microprocessor reset pins?
Yes, but with caution: the push-pull RST output of the MAX6735KAZWD3+T may cause contention with bidirectional μP reset I/O. To prevent this, insert a 10kΩ series resistor between RST and the μP reset pin, as documented in Maxim's Application Note for interfacing with bidirectional reset ports.
MAX6735KAZWD3+T 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+T FAQ
1.How can I place an order for MAX6735KAZWD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735KAZWD3+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 MAX6735KAZWD3+T reliable?
The price and inventory of MAX6735KAZWD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735KAZWD3+T is usually 5 days.
3.What payment methods are accepted for MAX6735KAZWD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735KAZWD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735KAZWD3+T?
MAX6735KAZWD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735KAZWD3+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 MAX6735KAZWD3+T?
For technical support, including MAX6735KAZWD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735KAZWD3+T requirements.
6.How does Aetrix verify that MAX6735KAZWD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6735KAZWD3+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 MAX6735KAZWD3+T meets industry standards.
7.What is the process for return or replacement of MAX6735KAZWD3+T?
All MAX6735KAZWD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735KAZWD3+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 MAX6735KAZWD3+T part is unused and in its original packaging.
Return procedure for MAX6735KAZWD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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