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Analog Devices Inc./Maxim Integrated MAX6734KAWGD3+
- Part No.:
- MAX6734KAWGD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6734KAWGD3+.pdf
- Description:
- IC SUPERVISOR
- Quantity:
- Payment:
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Product details
Overview
MAX6734KAWGD3+ from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring VCC1 (4.625V nominal), VCC2 (3.075V nominal), and an adjustable RSTIN input (626mV threshold). It features open-drain RST and WDO outputs, 140ms–280ms reset timeout (D3 option), manual reset input, and operates across –40°C to +85°C. It is used in multivoltage telecom and industrial systems requiring reliable power-on reset and system lockup protection.
For engineers reviewing the MAX6734KAWGD3+ datasheet, MAX6734KAWGD3+ pinout, MAX6734KAWGD3+ application, or MAX6734KAWGD3+ equivalent, key selection criteria include dual fixed-voltage thresholds (VCC1/VCC2), third adjustable supply monitoring via RSTIN, watchdog startup delay (35s min), low quiescent current (14µA typ), and SOT23-8 package compatibility with space-constrained embedded designs.
Technical Context
The MAX6734KAWGD3+ integrates three independent voltage monitors: two factory-set comparators for VCC1 and VCC2, plus a high-impedance adjustable comparator on RSTIN referenced to a precise 626mV internal bandgap. Its dual-mode watchdog timer provides a 35s minimum initial timeout after reset for system initialization, then switches to 1.12s minimum normal-mode timeout upon first WDI transition.
Reset assertion is guaranteed down to VCC1 or VCC2 = +0.8V, and the open-drain RST/WDO outputs require external pullups. The device uses BiCMOS process technology, supports manual reset with internal 50kΩ pullup, and rejects short VCC transients via built-in glitch immunity - critical for stable operation in noisy power environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-set, L suffix), ensures reliable reset when primary supply drops below nominal +4.63V level |
| VCC2 Threshold | 3.075V (factory-set, T suffix), enables accurate secondary supply monitoring at +3.08V nominal |
| RSTIN Threshold | 626mV ±15mV, allows external resistive divider to monitor third supply down to +0.63V |
| Reset Timeout | 140ms–280ms (D3 option), defines minimum reset pulse width for safe μP initialization |
| Watchdog Startup Delay | 35s (min) after reset, provides sufficient time for full system boot before watchdog enforcement begins |
| Supply Current | 14µA (typ at +3.6V), minimizes standby power draw in battery-operated or energy-sensitive applications |
| Operating Temp | –40°C to +85°C, fully specified for industrial-grade reliability without derating |
Pinout & Package
MAX6734KAWGD3+ is housed in an 8-pin SOT23-8 package (package code K8SN+1), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free finish (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Open-drain output; requires external pullup; asserts low on VCC1/VCC2/RSTIN undervoltage or MR activation |
| 2 - GND | Ground reference | Common return path for all internal circuitry and voltage monitors |
| 3 - WDO | Active-low watchdog output | Open-drain output; asserts low if WDI lacks edge within timeout; deasserts immediately when valid WDI edge detected |
| 4 - VCC1 | Primary supply input | Powers device and feeds primary reset comparator; threshold set to 4.625V (L suffix) |
| 5 - RSTIN | Adjustable reset input | High-impedance comparator input referenced to 626mV; monitors third supply via external resistor divider |
| 6 - WDI | Watchdog input | Edge-triggered input; clears watchdog timer on rising/falling transition; unconnected does not disable watchdog |
| 7 - MR | Manual reset input | Active-low; internal 50kΩ pullup to VCC1; forces reset when driven low; supports momentary switch interface |
| 8 - VCC2 | Secondary supply input | Feeds secondary reset comparator; threshold set to 3.075V (T suffix); powers internal logic when > VCC1 |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneously supervises VCC1 (4.625V), VCC2 (3.075V), and adjustable RSTIN - eliminates need for discrete supervisors or external comparators |
| Dual-mode watchdog timer | 35s startup delay followed by 1.12s normal timeout - accommodates long boot sequences while enabling rapid fault detection during runtime |
| Guaranteed reset validity down to 0.8V | Ensures clean, predictable reset assertion even during brownout conditions where VCC1/VCC2 dip near operational floor |
| Immunity to short VCC transients | Rejects sub-microsecond supply glitches without false resets - verified by transient duration vs. overdrive characterization curves |
| Low 14µA supply current | Reduces system-level standby power consumption - critical for portable, battery-backed, or always-on industrial controllers |
Applications
| Telecom Power Management | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring +48V DC-DC converted rails (+3.3V, +1.8V, +1.2V) in base station line cards with cold-swap capability. IC Role / Device Role / Timing Role: Triple-supply supervisor ensuring coordinated reset of FPGA, DSP, and analog front-end during power-up, brownout, or hot-insertion events. Use Value: Prevents partial initialization and metastability by asserting RST until all three rails stabilize above their thresholds and remain valid for ≥140ms. |
Use Scenario: Supervising isolated +24V field bus, +5V logic, and +3.3V MCU core supplies in modular programmable logic controller chassis. IC Role / Device Role / Timing Role: Fault-detection hub that triggers system-wide reset on any rail collapse and feeds watchdog signal to main processor to detect firmware hangs. Use Value: Enables deterministic recovery from undervoltage faults without software intervention, meeting IEC 61000-4-29 immunity requirements. |
| Network Switch ASIC Power Sequencing | Medical Diagnostic Imaging Subsystem |
Use Scenario: Coordinating power-up of multi-rail ASIC (1.0V core, 1.8V I/O, 3.3V auxiliary) in 10G Ethernet switch line cards. IC Role / Device Role / Timing Role: Voltage supervisor providing synchronized reset release and independent watchdog supervision of ASIC firmware execution. Use Value: Eliminates need for external RC timing networks or sequencer ICs - reduces BOM count and PCB area in high-density switch fabric modules. |
Use Scenario: Monitoring +5V analog sensor bias, +3.3V digital control, and +1.2V FPGA core in portable ultrasound beamformer modules. IC Role / Device Role / Timing Role: Safety-critical reset generator with manual override (MR) and adjustable RSTIN for custom sensor rail monitoring. Use Value: Guarantees fail-safe shutdown on any supply anomaly, satisfying IEC 62304 Class C software safety requirements for diagnostic imaging hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KATGD3+ | Same VCC1/VCC2 thresholds (4.625V/3.075V), same D3 timeout, but automotive-qualified (AEC-Q100 Grade 3) and rated for extended temperature range | Required for automotive infotainment or ADAS ECUs; not necessary for commercial industrial use | Select MAX6734KATGD3+ only if AEC-Q100 qualification and –40°C to +105°C operation are mandatory |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only), no RSTIN input, no manual reset, push-pull RST, 200ms timeout - lacks triple-monitoring and adjustable input capability | Suitable only for single-rail systems; cannot replace MAX6734KAWGD3+ in multivoltage designs without redesign | Consider only for cost-sensitive, single-voltage applications where RSTIN and MR are unused; not a functional substitute |
Compared with MAX6734KATGD3+, the MAX6734KAWGD3+ offers identical electrical performance but omits automotive qualification - reducing cost and lead time for industrial/commercial deployments. Versus TPS3808G33DBVR, it delivers essential triple-supply supervision and RSTIN flexibility at higher integration, justifying its use where system complexity demands comprehensive voltage monitoring.
Availability
MAX6734KAWGD3+ is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and medical imaging equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6734KAWGD3+ 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, communications, and computing applications.
The MAX6730–MAX6735 family was developed specifically for robust, multivoltage microprocessor supervision in space-constrained systems - integrating triple monitoring, manual reset, and dual-mode watchdog functionality into ultra-small SOT23 packages.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6734KAWGD3+?
The MAX6734KAWGD3+ has a factory-set VCC1 reset threshold of 4.625V (L suffix), with guaranteed limits of 4.500V (min) and 4.750V (max) at TA = –40°C to +85°C. This value is laser-trimmed during production and remains stable over temperature with 20ppm/°C tempco.
Does the MAX6734KAWGD3+ support monitoring a third voltage higher than 0.63V?
Yes - the MAX6734KAWGD3+ supports monitoring voltages above 0.63V using the RSTIN pin with an external resistive voltage divider. For example, to monitor a +5V rail, connect R1 = 7.2kΩ between +5V and RSTIN, and R2 = 1.0kΩ between RSTIN and GND, yielding ~626mV at RSTIN when the rail is nominal.
What is the function of the WDI pin on the MAX6734KAWGD3+ and how should it be driven?
The WDI (watchdog input) pin on the MAX6734KAWGD3+ must receive periodic rising or falling edges to prevent watchdog timeout. It is CMOS-compatible (VIH = 0.7×VCC1, VIL = 0.3×VCC1) and draws <±1µA. Driving WDI from a GPIO toggled at least once every 1.12s (min) in normal mode prevents WDO assertion.
Is the MAX6734KAWGD3+ pin-compatible with other devices in the MAX6730–MAX6735 family?
No - the MAX6734KAWGD3+ uses the 8-pin SOT23-8 package, while MAX6730–MAX6733 use 6-pin SOT23-6. Pin functions differ significantly: RSTIN and VCC2 occupy dedicated pins in the 8-pin layout, and there is no direct pin-to-pin mapping between 6-pin and 8-pin variants.
What is the maximum allowable VCC transient duration that will not trigger a reset on the MAX6734KAWGD3+?
The MAX6734KAWGD3+ tolerates falling VCC transients up to 10ms in duration when the overdrive (drop below threshold) is ≤100mV, per the "Maximum VCC_ Transient Duration vs. Reset Threshold Overdrive" curve in the datasheet. Larger overdrives reduce allowable pulse width - e.g., 500mV overdrive limits transients to <100µs.
MAX6734KAWGD3+ 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:
- -
MAX6734KAWGD3+ FAQ
1.How can I place an order for MAX6734KAWGD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6734KAWGD3+ 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 MAX6734KAWGD3+ reliable?
The price and inventory of MAX6734KAWGD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6734KAWGD3+ is usually 5 days.
3.What payment methods are accepted for MAX6734KAWGD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6734KAWGD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6734KAWGD3+?
MAX6734KAWGD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6734KAWGD3+ 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 MAX6734KAWGD3+?
For technical support, including MAX6734KAWGD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6734KAWGD3+ requirements.
6.How does Aetrix verify that MAX6734KAWGD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6734KAWGD3+ 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 MAX6734KAWGD3+ meets industry standards.
7.What is the process for return or replacement of MAX6734KAWGD3+?
All MAX6734KAWGD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6734KAWGD3+, 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 MAX6734KAWGD3+ part is unused and in its original packaging.
Return procedure for MAX6734KAWGD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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