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Analog Devices Inc./Maxim Integrated MAX6735KAZID3
- Part No.:
- MAX6735KAZID3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6735KAZID3.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:1,956
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Product details
Overview
MAX6735KAZID3 from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring +3.075V (VCC1), +0.788V (VCC2), and an adjustable input down to +0.626V (RSTIN). It features push-pull RESET and WDO outputs, 140ms–280ms reset timeout, and operates across –40°C to +85°C for reliable system initialization and fault recovery in multivoltage embedded systems.
For engineers reviewing the MAX6735KAZID3 datasheet, MAX6735KAZID3 pinout, MAX6735KAZID3 application, or MAX6735KAZID3 equivalent, this device delivers verified triple-supply monitoring, factory-set thresholds, manual reset input, dual-mode watchdog timing (35s startup / 1.12s normal), and guaranteed reset validity down to VCC = +0.8V - critical for telecom, industrial, and portable equipment design.
Technical Context
The MAX6735KAZID3 implements three independent voltage monitors: a primary comparator on VCC1 (+3.075V nominal), secondary on VCC2 (+0.788V nominal), and high-impedance adjustable RSTIN input referenced to a 626mV internal bandgap. Its reset logic asserts active-low RST when any monitored voltage falls below its threshold, with hysteresis of 0.5% and 45µs propagation delay.
It integrates a dual-mode watchdog timer: a 35s (min) initial timeout after power-up or reset, followed by a 1.12s (min) normal mode triggered by the first valid WDI edge. The push-pull RST and WDO outputs drive loads directly without external pullups, and MR input includes a 50kΩ internal pullup and 1µs minimum pulse width support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +3.075V nominal (TZ suffix), ±1.5% tolerance over temperature - ensures precise core supply monitoring |
| VCC2 Threshold | +0.788V nominal (RD suffix), ±1.5% tolerance - supports low-voltage I/O or auxiliary rail supervision |
| RSTIN Threshold | +626mV internal reference, ±2.5mV max deviation - enables accurate third-rail monitoring via external divider |
| Reset Timeout | D3 option: 140ms (min) to 280ms (max) - provides stable reset hold time for complex boot sequences |
| Supply Current | 14µA typical at +3.6V - minimizes quiescent load on battery-backed or energy-constrained systems |
| Operating Temp | –40°C to +85°C - fully specified for industrial and extended-environment deployment |
| Watchdog Startup | 35s minimum initial timeout - allows full system initialization before watchdog enforcement begins |
Pinout & Package
The MAX6735KAZID3 is housed in an 8-pin SOT23-8 package (3.00mm × 2.80mm × 1.30mm), optimized for space-constrained PCB layouts while maintaining thermal performance and manufacturability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Push-pull driver; asserts low during undervoltage, manual reset, or watchdog timeout - no external pullup required |
| 2 - GND | Ground reference | Common return path for all internal comparators, timers, and I/O - must be low-impedance connection |
| 3 - VCC2 | Secondary supply input | Monitors +0.788V rail; powers internal circuitry when VCC2 > VCC1 - supports dual-supply priority arbitration |
| 4 - MR | Active-low manual reset input | Internally pulled up to VCC1 (50kΩ); initiates reset on logic-low assertion - debounced via 1µs minimum pulse width |
| 5 - WDI | Watchdog input | Edge-sensitive; clears watchdog timer on rising/falling transition - floating state does not disable watchdog |
| 6 - VCC1 | Primary supply input | Monitors +3.075V rail; powers device when VCC1 > VCC2 - defines main reset threshold and supplies RSTIN reference |
| 7 - RSTIN | Adjustable reset comparator input | High-impedance (±25nA leakage) node referenced to 626mV - accepts resistive dividers for third-rail monitoring |
| 8 - WDO | Active-low watchdog output | Push-pull driver; asserts low on WDI timeout or VCC/RSTIN undervoltage - independent of RST for fault isolation |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneously supervises VCC1 (+3.075V), VCC2 (+0.788V), and RSTIN (adjustable down to +0.626V) - eliminates need for multiple discrete supervisors |
| Dual-mode watchdog timer | 35s min startup delay + 1.12s min normal timeout - accommodates lengthy boot sequences while enabling rapid fault detection post-initialization |
| Push-pull RST and WDO outputs | Drive CMOS/TTL loads directly without external pullups - simplifies BOM and improves noise immunity vs. open-drain alternatives |
| Guaranteed reset validity to +0.8V | Ensures clean, predictable reset assertion even during brownout conditions - critical for fail-safe system recovery |
| Immunity to short VCC transients | Rejects glitches <45µs (at 100mV overdrive) - prevents spurious resets in noisy power environments |
Applications
| Telecom Line Card Power Management | Industrial PLC I/O Module |
|---|---|
Use Scenario: Supervising +3.3V backplane, +1.8V FPGA core, and +1.2V ADC reference rails in a field-deployed line card. IC Role / Device Role / Timing Role: Triple-voltage supervisor asserting coordinated reset across power domains and initiating watchdog supervision after FPGA configuration completes. Use Value: Prevents partial initialization lockup by holding reset until all rails stabilize, then enforcing software liveness via 1.12s watchdog timeout. | Use Scenario: Monitoring +24V DC input, +5V logic, and +3.3V microcontroller supply in a DIN-rail mounted programmable logic controller. IC Role / Device Role / Timing Role: Primary system health monitor triggering hardware reset on undervoltage and enabling manual reset via front-panel button. Use Value: Ensures deterministic recovery from brownouts using 140–280ms reset timeout, while MR input supports field technician-initiated diagnostics. |
| Portable Medical Sensor Hub | Set-Top Box Mainboard |
Use Scenario: Managing battery-backed +3.0V MCU, +1.8V sensor interface, and +0.9V ultra-low-power memory rail in a wearable diagnostic device. IC Role / Device Role / Timing Role: Low-quiescent (14µA) triple-supply supervisor with adjustable RSTIN for custom rail monitoring and push-pull outputs minimizing standby current. Use Value: Extends battery life while guaranteeing reset validity down to +0.8V - essential for graceful shutdown during end-of-life battery discharge. | Use Scenario: Coordinating reset sequencing for +12V power stage, +3.3V SoC, and +1.1V DDR termination voltage in consumer entertainment hardware. IC Role / Device Role / Timing Role: Centralized reset arbiter with independent WDO output feeding SoC watchdog input and RST driving power management IC enable lines. Use Value: Enables layered fault response: RST halts execution, WDO triggers SoC-level recovery - improving system resilience without firmware modification. |
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 | Same pinout and triple-monitor architecture, but open-drain RST/WDO outputs and identical TZ/RD thresholds | Requires external pullups; better suited for bidirectional µP reset pins or wired-OR reset buses | Select when interfacing with processors requiring open-drain reset signaling or shared reset lines |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only), no RSTIN input, no manual reset, 200ms fixed timeout, 1.6µA supply current | Lacks dual/third-rail monitoring and MR functionality - suitable only for simple single-rail systems | Choose only if monitoring one rail suffices and ultra-low current (<2µA) is prioritized over feature set |
Compared with MAX6734KAZWD3-T and TPS3808G33DBVR, the MAX6735KAZID3 uniquely combines push-pull drive, manual reset, and triple-voltage supervision in SOT23-8 - delivering higher integration and lower board complexity for multirail embedded systems requiring robust, self-contained reset control.
Availability
MAX6735KAZID3 is available at Aetrix Electronics and suitable for telecom line cards, industrial PLCs, portable medical sensors, and set-top box mainboards requiring stable component supply, long-lifecycle support, and guaranteed reset behavior under brownout conditions.
Supply support for MAX6735KAZID3 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 MAX6730–MAX6735 family delivers integrated microprocessor supervision with factory-set thresholds, adjustable inputs, and independent watchdog outputs - engineered specifically for reliability-critical multivoltage embedded systems where deterministic reset and fault recovery are mandatory.
FAQ
What voltage rails does the MAX6735KAZID3 monitor, and what are their exact thresholds?
The MAX6735KAZID3 monitors three rails: VCC1 at +3.075V (TZ suffix), VCC2 at +0.788V (RD suffix), and RSTIN with a fixed +626mV internal reference. These values are factory-trimmed and specified across –40°C to +85°C with ±1.5% tolerance for VCC1/VCC2 and ±2.5mV for RSTIN. The MAX6735KAZID3 uses these thresholds to assert RST when any rail drops below its respective level.
Does the MAX6735KAZID3 require external pullup resistors on its RST and WDO outputs?
No. The MAX6735KAZID3 features push-pull RST and WDO outputs, eliminating the need for external pullup resistors. This reduces BOM count and improves noise immunity compared to open-drain variants like the MAX6734 series. The MAX6735KAZID3 drives high/low states actively, supporting direct connection to CMOS/TTL inputs without additional components.
How does the watchdog timer in the MAX6735KAZID3 operate during system startup?
The MAX6735KAZID3 implements a dual-mode watchdog: after any reset event (power-up, brownout, or MR assertion), it enters a 35s minimum startup mode to allow full system initialization. Once the first valid WDI edge occurs, it switches to 1.12s minimum normal mode. This ensures the MAX6735KAZID3 does not trigger false timeouts during boot while maintaining tight supervision thereafter.
Can the MAX6735KAZID3 monitor a supply voltage higher than +0.626V using the RSTIN pin?
Yes. The RSTIN pin has a fixed +626mV internal reference, but accepts higher voltages via an external resistive divider. For example, connecting R1=100kΩ and R2=22kΩ from a +3.3V rail to RSTIN yields ~0.626V at RSTIN. The MAX6735KAZID3 monitors the divided voltage, enabling flexible third-rail supervision without adding discrete comparators.
What is the minimum pulse width required on the MR input of the MAX6735KAZID3 to trigger a reset?
The MR input of the MAX6735KAZID3 requires a minimum pulse width of 1µs to reliably assert reset. This specification ensures noise immunity against brief transients while allowing use of mechanical pushbuttons or digital logic signals. The MAX6735KAZID3 holds RST asserted for the full reset timeout period (140–280ms) after MR returns high, guaranteeing complete system reset.
MAX6735KAZID3 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:
- 1.388V, 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
MAX6735KAZID3 FAQ
1.How can I place an order for MAX6735KAZID3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6735KAZID3 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 MAX6735KAZID3 reliable?
The price and inventory of MAX6735KAZID3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6735KAZID3 is usually 5 days.
3.What payment methods are accepted for MAX6735KAZID3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6735KAZID3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6735KAZID3?
MAX6735KAZID3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6735KAZID3 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 MAX6735KAZID3?
For technical support, including MAX6735KAZID3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6735KAZID3 requirements.
6.How does Aetrix verify that MAX6735KAZID3 is sourced from the original manufacturer or authorized distributors?
All MAX6735KAZID3 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 MAX6735KAZID3 meets industry standards.
7.What is the process for return or replacement of MAX6735KAZID3?
All MAX6735KAZID3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6735KAZID3, 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 MAX6735KAZID3 part is unused and in its original packaging.
Return procedure for MAX6735KAZID3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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