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Analog Devices Inc./Maxim Integrated MAX6734KAZWD3
- Part No.:
- MAX6734KAZWD3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6734KAZWD3.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:2,943
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Product details
Overview
MAX6734KAZWD3 from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring +3.075V (VCC1), +1.665V (VCC2), and an adjustable input down to +0.63V via RSTIN. It features open-drain RESET and WDO outputs, 210ms reset timeout, and operates across –40°C to +85°C - used in multivoltage telecom and industrial control systems requiring reliable power-up sequencing and fault recovery.
For engineers reviewing the MAX6734KAZWD3 datasheet, MAX6734KAZWD3 pinout, MAX6734KAZWD3 application, or MAX6734KAZWD3 equivalent, key selection criteria include its dual fixed-threshold supervision (+3.075V/+1.665V), adjustable third-channel monitoring, 210ms reset timeout, open-drain outputs, and SOT23-8 package compatibility with space-constrained embedded designs.
Technical Context
The MAX6734KAZWD3 integrates three independent voltage monitors: VCC1 comparator with 3.075V nominal threshold (±125mV), VCC2 comparator with 1.665V nominal threshold (±25mV), and RSTIN comparator referenced to a precise 626mV internal bandgap. All thresholds exhibit ≤20ppm/°C tempco and ≥0.5% hysteresis for noise immunity.
Its watchdog architecture provides dual-mode timing: 35s minimum startup delay after reset, then 1.12s minimum normal timeout on WDI transitions. The active-low open-drain RST and WDO outputs assert when any monitored supply falls below threshold, RSTIN drops below 626mV, or MR is pulled low - with guaranteed reset validity down to VCC1/VCC2 = +0.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +3.075V (nominal), ±125mV tolerance - sets primary supply monitor for +3.3V rails |
| VCC2 Threshold | +1.665V (nominal), ±25mV tolerance - targets secondary supply like +1.8V core logic |
| RSTIN Threshold | +626mV (typical), ±15.5mV - enables adjustable third-channel monitoring via external resistor divider |
| Reset Timeout | 140ms to 280ms (D3 option) - ensures sufficient hold time for processor initialization |
| Supply Current | 14µA (typ) at +3.6V - supports ultra-low-power battery-operated equipment |
| Operating Temp | –40°C to +85°C - qualified for industrial and telecom infrastructure environments |
| Package | SOT23-8 - 2.8mm × 2.9mm footprint ideal for dense PCB layouts |
Pinout & Package
SOT23-8 package: 2.8mm × 2.9mm body, 0.65mm pitch, gull-wing leads, JEDEC MO-178 compliant. RoHS-compliant lead-free version available (suffix +T).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; requires external pullup; asserts if VCC1/VCC2/RSTIN drop or MR is low |
| 2 | GND | Ground reference for all internal comparators and logic |
| 3 | VCC2 | Secondary supply input; powers device when > VCC1; feeds VCC2 monitor |
| 4 | WDO | Active-low open-drain watchdog output; asserts if WDI stalls beyond timeout or undervoltage occurs |
| 5 | VCC1 | Primary supply input; powers device when > VCC2; feeds VCC1 monitor |
| 6 | RSTIN | Adjustable reset comparator input; high-impedance (±25nA); referenced to 626mV internal reference |
| 7 | MR | Active-low manual reset input; internal 50kΩ pullup to VCC1; initiates reset and clears watchdog timer |
| 8 | WDI | Watchdog input; edge-sensitive; clears timer on rising/falling transition; floating does not disable watchdog |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneously supervises two fixed supplies (+3.075V, +1.665V) and one adjustable rail (via RSTIN) - eliminates need for discrete supervisors |
| Dual-mode watchdog timer | 35s startup delay enables full system boot; 1.12s normal timeout detects runtime lockups - prevents false resets during initialization |
| Guaranteed reset down to +0.8V | Valid RST assertion even as VCC1 or VCC2 decays to +0.8V - ensures clean reset during brownout conditions |
| Immunity to short VCC transients | Rejects glitches <10µs wide at 100mV overdrive - avoids spurious resets in noisy power environments |
| Low quiescent current | 14µA typical supply current at +3.6V - extends battery life in portable equipment without sacrificing supervision accuracy |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring +3.3V backplane, +1.8V FPGA core, and +12V auxiliary rail in carrier-grade access equipment. IC Role / Device Role / Timing Role: Triple-supply supervisor ensuring synchronized reset release and watchdog-triggered recovery from firmware hangs. Use Value: Prevents uncontrolled state propagation during partial power loss by asserting RST only when all three rails stabilize above thresholds. |
Use Scenario: Supervising +24V field power, +5V logic, and +3.3V microcontroller supply in modular I/O terminals. IC Role / Device Role / Timing Role: Fault-detection hub that triggers hardware reset and alerts host controller via WDO upon undervoltage or software stall. Use Value: Enables deterministic fail-safe behavior per IEC 61508 SIL-2 requirements using single-chip supervision instead of discrete RC networks. |
| Server Baseboard Management | Medical Diagnostic Imaging |
Use Scenario: Validating +12V, +5V, and +3.3V ATX rails during BMC-initiated power-on sequence in rack servers. IC Role / Device Role / Timing Role: Sequencing coordinator that delays CPU reset until all critical voltages exceed thresholds and watchdog is armed. Use Value: Eliminates race conditions between power-good signals and firmware handoff by enforcing 210ms minimum reset hold time. |
Use Scenario: Monitoring isolated +5V analog front-end, +3.3V digital subsystem, and +1.2V ADC reference in ultrasound beamformer modules. IC Role / Device Role / Timing Role: Safety-critical supervisor that forces immediate shutdown if any rail deviates beyond ±3% tolerance window. Use Value: Meets FDA Class II device reliability requirements via 20ppm/°C threshold stability and guaranteed operation at –40°C cold-start. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KALTD3-T | VCC1 = +4.625V, VCC2 = +3.075V; same D3 timeout and SOT23-8 package | Targets +5V/3.3V dual-rail systems instead of +3.3V/1.8V; no RSTIN adjustment needed for higher-voltage third rail | Select when primary supply is +5V and secondary is +3.3V - preserves identical timing, watchdog, and pinout |
| TPS3808G33DBVR | Single-supply (3.3V), push-pull RST, no RSTIN or VCC2 monitor; 200ms timeout | Lacks triple-monitoring capability and adjustable input; suitable only for basic 3.3V-only systems | Choose only for cost-sensitive, single-rail applications where dual/third-rail supervision is unnecessary |
Compared with MAX6734KAZWD3, the MAX6734KALTD3-T offers higher fixed thresholds for legacy 5V/3.3V systems but identical triple-monitoring architecture, while TPS3808G33DBVR reduces functionality to single-rail supervision - making it unsuitable for applications requiring simultaneous VCC1/VCC2/RSTIN monitoring.
Availability
MAX6734KAZWD3 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical imaging equipment requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX6734KAZWD3 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 for high-reliability embedded systems where discrete solutions increase board area and failure risk.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6734KAZWD3?
The MAX6734KAZWD3 has a VCC1 reset threshold of +3.075V (nominal, ±125mV) and a VCC2 threshold of +1.665V (nominal, ±25mV), as defined by the 'Z' and 'W' suffixes in its part number per Maxim's Reset Voltage Threshold Suffix Guide. These values are factory-trimmed and guaranteed over temperature.
Does the MAX6734KAZWD3 support an adjustable third voltage monitor, and how is it implemented?
Yes, the MAX6734KAZWD3 supports an adjustable third voltage monitor via its RSTIN pin, which compares the input to a precise 626mV internal reference. To monitor voltages above 626mV, connect a resistive divider from the target rail to RSTIN - enabling flexible supervision of custom supply levels without external components.
What is the reset timeout period for the MAX6734KAZWD3, and is it configurable?
The MAX6734KAZWD3 uses the D3 reset timeout option, providing a guaranteed 140ms to 280ms reset assertion period after all monitored voltages exceed their thresholds. This timeout is factory-set and non-configurable - selected at order time via the suffix 'D3' in the part number.
How does the watchdog timer operate on the MAX6734KAZWD3 during power-up and normal operation?
The MAX6734KAZWD3 watchdog starts in a 35s minimum startup mode after reset to allow full system initialization, then switches to a 1.12s minimum normal timeout after the first valid WDI edge. This dual-mode behavior prevents premature timeouts during boot while ensuring rapid detection of runtime lockups.
What package type and pin count does the MAX6734KAZWD3 use, and are there layout considerations for its open-drain outputs?
The MAX6734KAZWD3 uses an 8-pin SOT23-8 package with 0.65mm pitch. Its RST and WDO outputs are active-low open-drain - requiring external pullup resistors (typically 4.7kΩ to VCC1) to ensure proper logic levels and avoid floating states during reset assertion.
MAX6734KAZWD3 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:
- Open Drain or Open Collector
- 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
MAX6734KAZWD3 FAQ
1.How can I place an order for MAX6734KAZWD3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6734KAZWD3 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 MAX6734KAZWD3 reliable?
The price and inventory of MAX6734KAZWD3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6734KAZWD3 is usually 5 days.
3.What payment methods are accepted for MAX6734KAZWD3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6734KAZWD3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6734KAZWD3?
MAX6734KAZWD3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6734KAZWD3 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 MAX6734KAZWD3?
For technical support, including MAX6734KAZWD3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6734KAZWD3 requirements.
6.How does Aetrix verify that MAX6734KAZWD3 is sourced from the original manufacturer or authorized distributors?
All MAX6734KAZWD3 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 MAX6734KAZWD3 meets industry standards.
7.What is the process for return or replacement of MAX6734KAZWD3?
All MAX6734KAZWD3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6734KAZWD3, 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 MAX6734KAZWD3 part is unused and in its original packaging.
Return procedure for MAX6734KAZWD3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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