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Analog Devices Inc./Maxim Integrated MAX6734KASYD3+T
- Part No.:
- MAX6734KASYD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6734KASYD3+T.pdf
- Description:
- IC SUPERVISOR MPU W/WD SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6734KASYD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with active-low open-drain reset and watchdog outputs, monitoring VCC1 (+2.925V nominal), VCC2 (+2.188V nominal), and an adjustable RSTIN input (626mV threshold). It features 210ms reset timeout, manual reset input, and operates over –40°C to +85°C in SOT23-8 package. Used in multivoltage telecom and industrial systems for reliable power-on and brownout detection.
For engineers reviewing the MAX6734KASYD3+T datasheet, MAX6734KASYD3+T pinout, MAX6734KASYD3+T application, or MAX6734KASYD3+T equivalent, key selection criteria include dual fixed-voltage thresholds (2.925V/2.188V), adjustable third-supply monitoring down to 0.63V, 14μA typical supply current, AEC-Q100 qualification eligibility, and compatibility with manual reset and independent watchdog timing.
Technical Context
The MAX6734KASYD3+T implements three independent voltage monitors: two factory-set comparators (VCC1 at 2.925V, VCC2 at 2.188V) and one high-impedance adjustable comparator (RSTIN, 626mV reference) enabling third-supply monitoring via external resistor divider. Its reset logic asserts active-low RST when any monitored voltage falls below its threshold, with guaranteed validity down to VCC = +0.8V.
It integrates a dual-mode watchdog timer: 35s minimum startup delay after reset, followed by 1.12s minimum normal-mode timeout. The WDI input clears the timer on any edge; WDO provides independent open-drain watchdog output. MR input supports manual reset with internal 50kΩ pullup and 200ns propagation delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | 2.925V (nominal); factory-set for primary supply monitoring |
| VCC2 Reset Threshold | 2.188V (nominal); factory-set for secondary supply monitoring |
| RSTIN Threshold | 626mV ±15.5mV; enables adjustable third-supply monitoring down to 0.63V |
| Reset Timeout Period | 210ms (typical); D3 suffix ensures deterministic reset hold time |
| Supply Current | 14μA (typ at +3.6V); ultra-low quiescent current for battery-sensitive designs |
| Operating Temperature | –40°C to +85°C; fully specified for industrial and extended commercial environments |
| Package | SOT23-8; space-saving 8-pin surface-mount footprint with 1.3mm height |
Pinout & Package
SOT23-8 package: 8-pin, lead(Pb)-free, RoHS-compliant, 1.3mm max height, thermal resistance θJA = 180°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; requires external pullup; asserts during VCC1/VCC2/RSTIN undervoltage or MR assertion |
| 2 | GND | Ground reference for all internal circuitry and comparators |
| 3 | WDO | Active-low open-drain watchdog output; asserts if WDI lacks edge for >1.12s (normal mode) or >35s (startup) |
| 4 | VCC1 | Primary supply input; powers device and sets VCC1 monitor threshold (2.925V) |
| 5 | RSTIN | Adjustable reset comparator input; referenced to 626mV internal reference; monitors third supply via resistor divider |
| 6 | WDI | Watchdog input; edge-sensitive; clears watchdog timer on rising/falling transition |
| 7 | MR | Active-low manual reset input; internal 50kΩ pullup to VCC1; 200ns RST response |
| 8 | VCC2 | Secondary supply input; sets VCC2 monitor threshold (2.188V) |
Key Features
| Feature | Design Value |
|---|---|
| Dual factory-set voltage monitors | VCC1 = 2.925V, VCC2 = 2.188V - eliminates external resistors for standard rail supervision |
| Adjustable third-supply monitor | RSTIN with 626mV reference enables precise monitoring of voltages ≥0.63V using external divider |
| Independent watchdog output | Open-drain WDO allows separate system-level fault signaling without affecting reset path |
| Manual reset with glitch immunity | MR accepts 1µs minimum pulse and rejects <100ns noise; internal pullup simplifies PCB layout |
| Low-voltage operation guarantee | Valid RST assertion down to VCC1 or VCC2 = +0.8V - ensures reset integrity during deep brownouts |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Supervising +3.3V core, +2.5V I/O, and +1.2V analog rails in 5G baseband processing units. IC Role / Device Role / Timing Role: Triple-voltage supervisor ensuring synchronized power-up and brownout recovery across mixed-signal domains. Use Value: Prevents firmware lockup by asserting reset before digital logic becomes unstable, leveraging 210ms timeout and 14μA quiescent current. |
Use Scenario: Monitoring +24V field power, +5V controller rail, and +3.3V FPGA configuration voltage in programmable logic controllers. IC Role / Device Role / Timing Role: Fault-detection node that triggers safe shutdown and diagnostic logging upon undervoltage on any critical rail. Use Value: Enables deterministic fail-safe behavior using RSTIN to track isolated +24V supply via resistor divider, with MR supporting field-service reset. |
| Automotive Infotainment Head Units | Network Switch Power Management |
Use Scenario: Validating +5V USB interface, +3.3V SoC core, and +1.8V memory rails in AEC-Q100-qualified infotainment modules. IC Role / Device Role / Timing Role: System-level reliability enhancer providing independent watchdog supervision and manual reset for ECU reinitialization. Use Value: Supports automotive qualification path (MAX6734KASYD3/V+T variant available); 35s watchdog startup accommodates complex boot sequences. |
Use Scenario: Ensuring stable operation of +12V PoE midspan, +3.3V switch ASIC, and +1.2V SerDes supplies in managed Ethernet switches. IC Role / Device Role / Timing Role: Multirail supervisor coordinating power-good sequencing and detecting transient-induced brownouts on PoE-derived rails. Use Value: Immunity to short VCC transients prevents spurious resets; 210ms timeout aligns with IEEE 802.3af power-up timing requirements. |
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 = 2.625V, VCC2 = 2.188V - lower primary threshold; same RSTIN, timeout, and package | Better suited for systems with 2.5V primary rails instead of 2.8V/2.9V; identical watchdog and MR functionality | Select when primary supply is 2.5V ±5% rather than 2.8V–2.9V; no PCB changes required |
| MAX6735KASYD3+T | Push-pull RST output (vs. open-drain); otherwise identical thresholds, timeout, and pinout | Eliminates need for external RST pullup resistor; incompatible with bidirectional μP reset pins without series resistor | Choose for simplified BOM where push-pull drive is acceptable and μP reset pin is unidirectional |
Compared with MAX6734KASYD3+T, the KALTD3+T variant shifts VCC1 threshold downward for tighter 2.5V rail tolerance, while the MAX6735KASYD3+T replaces open-drain RST with push-pull drive-enabling direct connection to non-bidirectional reset inputs but requiring layout review for contention risk.
Availability
MAX6734KASYD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control, and automotive infotainment applications requiring stable component supply, long-term lifecycle support, and AEC-Q100-qualified alternatives.
Supply support for MAX6734KASYD3+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 demanding industrial, automotive, and communications applications.
The MAX6730–MAX6735 family delivers highly integrated, low-power microprocessor supervisors targeting multivoltage embedded systems needing robust power-monitoring, manual reset, and independent watchdog functionality.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6734KASYD3+T?
The MAX6734KASYD3+T has factory-set VCC1 reset threshold of 2.925V (±75mV) and VCC2 reset threshold of 2.188V (±75mV), per the 'SY' suffix in its part number. These values are guaranteed over –40°C to +85°C and include 0.5% hysteresis referenced to typical threshold. The RSTIN input adds a third 626mV comparator for adjustable monitoring.
Does the MAX6734KASYD3+T support manual reset, and how is it implemented?
Yes, the MAX6734KASYD3+T includes an active-low manual reset input (MR) with internal 50kΩ pullup to VCC1. Driving MR low forces RST assertion for the full 210ms timeout period, even if monitored voltages remain valid. MR accepts 1µs minimum pulse width and rejects transients under 100ns, making it robust for front-panel or test-point reset implementation.
What is the watchdog timer behavior of the MAX6734KASYD3+T during power-up?
The MAX6734KASYD3+T features a dual-mode watchdog timer: after any reset event (power-up, brownout, or MR assertion), it enters a 35s minimum startup delay before transitioning to normal 1.12s minimum timeout mode. This allows time for complex firmware initialization before watchdog enforcement begins, preventing false timeouts during boot.
Can the MAX6734KASYD3+T monitor a 5V supply using the RSTIN pin?
Yes - the RSTIN pin has a fixed 626mV internal reference, so a 5V supply can be monitored using a resistor divider. For example, R1 = 68kΩ and R2 = 10kΩ yields ~0.638V at RSTIN when Vin = 5V, staying within the 611–642mV threshold range. The high-impedance input (±25nA leakage) minimizes divider current and power loss.
Is the MAX6734KASYD3+T qualified for automotive applications?
The base MAX6734KASYD3+T is rated for –40°C to +85°C and is not AEC-Q100 qualified. However, Maxim offers automotive-grade variants including MAX6734KASYD3/V+T (with /V suffix) that meet AEC-Q100 Grade 3 requirements. These share identical electrical specs and pinout but undergo additional stress testing and traceability controls.
MAX6734KASYD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 2.188V, 2.925V, 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
MAX6734KASYD3+T FAQ
1.How can I place an order for MAX6734KASYD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6734KASYD3+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 MAX6734KASYD3+T reliable?
The price and inventory of MAX6734KASYD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6734KASYD3+T is usually 5 days.
3.What payment methods are accepted for MAX6734KASYD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6734KASYD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6734KASYD3+T?
MAX6734KASYD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6734KASYD3+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 MAX6734KASYD3+T?
For technical support, including MAX6734KASYD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6734KASYD3+T requirements.
6.How does Aetrix verify that MAX6734KASYD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6734KASYD3+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 MAX6734KASYD3+T meets industry standards.
7.What is the process for return or replacement of MAX6734KASYD3+T?
All MAX6734KASYD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6734KASYD3+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 MAX6734KASYD3+T part is unused and in its original packaging.
Return procedure for MAX6734KASYD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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