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Analog Devices Inc./Maxim Integrated MAX6734KAVDD3+
- Part No.:
- MAX6734KAVDD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6734KAVDD3+.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
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Product details
Overview
MAX6734KAVDD3+ from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog timer, monitoring VCC1 (4.625V nominal), VCC2 (3.075V nominal), and an adjustable RSTIN input (626mV threshold). It features open-drain RST and WDO outputs, manual reset input (MR), and 210ms reset timeout period. Designed for multivoltage embedded systems requiring reliable power-on reset and lockup recovery, it supports telecom, industrial, and computing applications.
For engineers reviewing the MAX6734KAVDD3+ datasheet, MAX6734KAVDD3+ pinout, MAX6734KAVDD3+ application, or MAX6734KAVDD3+ equivalent, key selection considerations include its dual fixed-voltage thresholds (VCC1/VCC2), third adjustable monitoring channel, watchdog startup delay (35s min), low quiescent current (14µA typ), and SOT23-8 package compatibility with space-constrained PCB layouts.
Technical Context
The MAX6734KAVDD3+ integrates three independent voltage monitors: two factory-trimmed comparators for VCC1 and VCC2, plus a high-impedance RSTIN comparator referenced to an internal 626mV bandgap. Its watchdog timer operates in dual-mode-35s minimum initial delay after reset, then 1.12s minimum normal timeout-ensuring robust boot-time coverage and rapid fault detection during runtime.
Reset assertion is triggered by any monitored supply falling below its threshold, MR activation, or RSTIN dropping below 626mV. The open-drain RST and WDO outputs require external pullups and remain valid down to VCC1 or VCC2 = +0.8V, enabling reliable reset signaling across brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-set, ±125mV tolerance) - ensures precise reset initiation for primary 4.6V rails like I/O supplies. |
| VCC2 Threshold | 3.075V (factory-set, ±75mV tolerance) - matches common secondary 3.3V logic or memory rails. |
| RSTIN Threshold | 626mV (±15.5mV) - enables monitoring of third supply via resistive divider; supports voltages ≥0.63V. |
| Reset Timeout | 210ms (D3 option, min/max 140ms/280ms) - provides sufficient hold time for full system initialization before release. |
| Watchdog Timeout | 35s initial / 1.12s normal (min) - prevents premature reset during boot while enabling fast lockup detection post-initialization. |
| Supply Current | 14µA typical at +3.6V - minimizes standby power impact in battery-operated or energy-sensitive systems. |
| Operating Temp | -40°C to +85°C - fully specified for industrial and extended-temperature embedded deployments. |
Pinout & Package
MAX6734KAVDD3+ is housed in an 8-pin SOT23 package (K8SN+1 outline), measuring 2.9mm × 1.6mm × 1.1mm, optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Open-drain output asserted low on fault; requires external pullup; remains valid down to VCC1/VCC2 = +0.8V. |
| 2 - GND | Ground reference | Common return path for all internal comparators, watchdog, and I/O; must be low-impedance for noise immunity. |
| 3 - VCC2 | Secondary supply input | Monitors second rail (e.g., 3.3V); powers internal circuitry when > VCC1; threshold = 3.075V. |
| 4 - MR | Active-low manual reset input | Drives reset when pulled low; includes 50kΩ internal pullup to VCC1; 1µs minimum pulse width required. |
| 5 - WDI | Watchdog input | Edge-triggered input; clears watchdog timer on rising/falling transition; unconnected = no disable. |
| 6 - RSTIN | Adjustable reset comparator input | High-impedance (±25nA leakage) input referenced to 626mV; used with resistor divider to monitor third voltage. |
| 7 - WDO | Active-low watchdog output | Open-drain watchdog status signal; asserts low if WDI stalls beyond timeout; requires external pullup. |
| 8 - VCC1 | Primary supply input | Monitors main rail (e.g., 4.6V); powers device when > VCC2; threshold = 4.625V; defines VIL/VIH levels for MR/WDI. |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneous supervision of VCC1 (4.625V), VCC2 (3.075V), and RSTIN (626mV reference) eliminates need for discrete supervisors or external comparators. |
| Dual-mode watchdog timer | 35s startup delay followed by 1.12s normal timeout enables safe boot sequence execution while maintaining rapid lockup response during operation. |
| Immunity to short VCC transients | Guaranteed rejection of sub-100ns glitches per datasheet characterization, preventing spurious resets in noisy power environments. |
| Low supply current | 14µA typical at +3.6V reduces system-level standby power, critical for portable/battery-powered equipment. |
| Valid reset down to 0.8V supply | Ensures deterministic reset behavior during brownout conditions where VCC1 or VCC2 dips near operational floor. |
Applications
| Telecom Power Management | Industrial PLC Control |
|---|---|
Use Scenario: Monitoring primary 4.6V backplane supply, secondary 3.3V control rail, and auxiliary 1.2V FPGA core voltage in carrier-grade line cards. IC Role / Device Role / Timing Role: Triple-supply supervisor providing coordinated reset assertion and independent watchdog oversight of processor firmware execution. Use Value: Prevents undetected hangs during firmware updates by enforcing 35s watchdog startup window and ensuring reset validity even during partial brownouts. |
Use Scenario: Supervising 24V-to-5V DC/DC output (VCC1), isolated 3.3V logic rail (VCC2), and 1.8V microcontroller core (via RSTIN divider) in programmable logic controllers. IC Role / Device Role / Timing Role: Fault-detection hub that initiates hard reset on any rail collapse and triggers watchdog recovery if ladder logic execution stalls. Use Value: Eliminates need for three separate supervisors, reducing BOM count and PCB area while guaranteeing -40°C to +85°C operation in harsh factory environments. |
| Server Baseboard Management | Medical Diagnostic Imaging |
Use Scenario: Ensuring clean power-up sequencing and runtime integrity for BMC (Baseboard Management Controller) in x86 server motherboards with multiple voltage domains. IC Role / Device Role / Timing Role: Supervisor coordinating reset timing across VCCIO (4.625V), VCCSA (3.075V), and VCCPLL (monitored via RSTIN) with integrated watchdog. Use Value: 210ms D3 reset timeout aligns with Intel PCH specification requirements, while open-drain outputs interface safely with bidirectional BMC reset pins. |
Use Scenario: Monitoring 5V analog front-end supply, 3.3V digital subsystem, and 1.5V ADC reference rail in portable ultrasound units with strict safety-critical uptime requirements. IC Role / Device Role / Timing Role: Safety-enabling supervisor asserting reset and watchdog signals to ARM Cortex-M7 host processor upon any rail deviation. Use Value: AEC-Q100 qualified variants (e.g., MAX6734KATGD3/V+T) support medical-grade reliability; 626mV RSTIN threshold enables accurate low-voltage monitoring without external references. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KALTD3+ | VCC1 = 4.375V, VCC2 = 2.625V (LT suffix vs. AV); same D3 timeout, SOT23-8, open-drain outputs. | Better suited for systems with 4.4V I/O rails and 2.6V secondary logic; less margin for 4.6V nominal supplies. | Select MAX6734KALTD3+ only if VCC1/VCC2 thresholds match actual rail tolerances; otherwise MAX6734KAVDD3+ provides tighter fit for 4.6V/3.1V systems. |
| TPS3808G33DBVR | Dual-voltage (3.3V/1.8V fixed), no RSTIN input, push-pull RST, 200ms timeout, SOT23-6; lacks third monitoring channel and dual-mode watchdog. | Limited to dual-rail systems; no adjustable third input; shorter watchdog timeout (200ms) reduces boot flexibility. | Choose TPS3808G33DBVR only for cost-sensitive dual-supply designs without need for third-rail monitoring or extended watchdog startup. |
Compared with MAX6734KALTD3+, MAX6734KAVDD3+ offers higher VCC1/VCC2 thresholds better aligned with 4.6V/3.1V rails, while TPS3808G33DBVR sacrifices triple monitoring and flexible watchdog timing for smaller footprint and lower unit cost in simpler applications.
Availability
MAX6734KAVDD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and server management applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6734KAVDD3+ 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 triple-voltage supervision with independent watchdog functionality, targeting high-reliability embedded systems where simultaneous multi-rail monitoring and fail-safe processor recovery are essential.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6734KAVDD3+?
The MAX6734KAVDD3+ has a factory-set VCC1 reset threshold of 4.625V (nominal), with guaranteed limits of 4.500V (min) and 4.750V (max) over temperature. This value corresponds to the 'AV' suffix in the part number and is laser-trimmed during production for high accuracy without external calibration.
Does the MAX6734KAVDD3+ support monitoring a third voltage, and how is it configured?
Yes, the MAX6734KAVDD3+ supports third-voltage monitoring via the RSTIN pin, which compares the input against an internal 626mV reference. To monitor voltages above 626mV, connect a resistive divider between the target rail and ground, with RSTIN tied to the divider midpoint. The MAX6734KAVDD3+ datasheet provides the formula VEXT_TH = 626mV × (R1 + R2)/R2 for setting the threshold.
What is the watchdog timeout behavior of the MAX6734KAVDD3+ during power-up?
The MAX6734KAVDD3+ implements a dual-mode watchdog: after any reset event (power-up, brownout, or MR assertion), it enforces a minimum 35s initial timeout period to allow full system initialization. Only after this expires-or upon the first valid WDI edge-does it switch to the shorter 1.12s normal timeout mode, ensuring both safe boot and responsive lockup detection.
Is the MAX6734KAVDD3+ compatible with bidirectional microprocessor reset pins?
Yes, but with caution: the MAX6734KAVDD3+ uses an open-drain RST output, making it inherently compatible with bidirectional μP reset I/O pins. However, to prevent contention during μP-driven reset assertion, a 10kΩ series resistor should be placed between RST and the μP pin, as recommended in the MAX6734KAVDD3+ datasheet Figure 5.
What package type and thermal characteristics does the MAX6734KAVDD3+ use?
The MAX6734KAVDD3+ is supplied in an 8-pin SOT23 package (K8SN+1 outline) with θJA = 180°C/W and θJC = 60°C/W. Its maximum continuous power dissipation at +70°C ambient is 444.4mW, derating by 5.6mW/°C above that temperature. The small 2.9mm × 1.6mm footprint supports high-density board layouts without compromising thermal performance.
MAX6734KAVDD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6734KAVDD3+ FAQ
1.How can I place an order for MAX6734KAVDD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6734KAVDD3+ 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 MAX6734KAVDD3+ reliable?
The price and inventory of MAX6734KAVDD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6734KAVDD3+ is usually 5 days.
3.What payment methods are accepted for MAX6734KAVDD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6734KAVDD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6734KAVDD3+?
MAX6734KAVDD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6734KAVDD3+ 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 MAX6734KAVDD3+?
For technical support, including MAX6734KAVDD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6734KAVDD3+ requirements.
6.How does Aetrix verify that MAX6734KAVDD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6734KAVDD3+ 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 MAX6734KAVDD3+ meets industry standards.
7.What is the process for return or replacement of MAX6734KAVDD3+?
All MAX6734KAVDD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6734KAVDD3+, 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 MAX6734KAVDD3+ part is unused and in its original packaging.
Return procedure for MAX6734KAVDD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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