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Analog Devices Inc./Maxim Integrated MAX6734KASDD3+
- Part No.:
- MAX6734KASDD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6734KASDD3+.pdf
- Description:
- MAX6734 TRIPLE-VOLTAGE MICROPROC
- Quantity:
- Payment:
- Shipping:
Inventory:364
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Product details
Overview
MAX6734KASDD3+ from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring two fixed supply rails (VCC1 = +2.925V, VCC2 = +0.788V) and one adjustable rail via RSTIN (626mV threshold), featuring 210ms reset timeout and open-drain RST/WDO outputs. It ensures reliable system boot and runtime supervision in multivoltage embedded systems such as telecom power management and industrial controllers.
For engineers reviewing the MAX6734KASDD3+ datasheet, MAX6734KASDD3+ pinout, MAX6734KASDD3+ application, or MAX6734KASDD3+ equivalent, key selection criteria include its dual fixed-threshold monitoring capability, 626mV adjustable comparator input, 210ms factory-set reset timeout, -40°C to +85°C operation, and SOT23-8 open-drain output configuration for compatibility with bidirectional µP reset pins.
Technical Context
The MAX6734KASDD3+ implements three independent voltage monitors: a primary comparator for VCC1 (+2.925V nominal), secondary for VCC2 (+0.788V nominal), and high-impedance RSTIN input referenced to an internal 626mV bandgap. All comparators feed into a shared reset timer with guaranteed assertion down to VCC ≥ +0.8V.
Its watchdog circuit operates in dual-mode: 35s minimum startup delay after reset, then transitions to 1.12s minimum normal timeout upon first WDI edge detection. The active-low open-drain WDO and RST outputs require external pullups and support direct interfacing with µP bidirectional reset I/O via series resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Reset Threshold | +2.925V (nominal, falling edge); enables precise monitoring of +3.3V I/O or +2.8V core rails with ±1.5% tolerance over temperature |
| VCC2 Reset Threshold | +0.788V (nominal, falling edge); supports low-voltage auxiliary rails like +0.8V memory supplies or FPGA configuration voltages |
| RSTIN Threshold | 626mV (typical); allows external resistor divider to monitor third supply up to +5.5V while maintaining <25nA input leakage |
| Reset Timeout Period | 140–280ms (D3 option); provides sufficient hold time for slow-starting DC/DC converters or FPGA configuration sequences |
| Supply Current | 14µA (typ at +3.6V); enables battery-backed operation in portable equipment with minimal quiescent drain |
| Operating Temperature | -40°C to +85°C; fully specified for industrial and telecom environments without derating |
| Watchdog Startup Delay | 35s (min); accommodates extended BIOS initialization or bootloader execution before watchdog enforcement begins |
Pinout & Package
MAX6734KASDD3+ is housed in an 8-pin SOT23-8 package (3.00mm × 2.60mm × 1.30mm body, 0.65mm pitch), optimized for space-constrained PCB layouts in telecom and portable applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RST | Active-low reset output | Open-drain output requiring external pullup; asserts low on VCC1/VCC2/RSTIN undervoltage or MR activation; valid down to VCC ≥ +0.8V |
| 2 - GND | Ground reference | Common return path for all internal comparators, watchdog logic, and I/O; must be low-impedance for noise immunity |
| 3 - VCC2 | Secondary supply input | Power source and monitored rail for +0.788V threshold; powers secondary comparator; accepts 0.8V–5.5V |
| 4 - WDO | Active-low watchdog output | Open-drain output asserting low on WDI timeout or VCC/RSTIN undervoltage; deasserts immediately when fault clears |
| 5 - VCC1 | Primary supply input | Primary power source and monitored rail for +2.925V threshold; powers core logic; accepts 0.8V–5.5V |
| 6 - RSTIN | Adjustable reset comparator input | High-impedance (≤25nA) input referenced to 626mV; used with external resistor divider to monitor third voltage rail |
| 7 - MR | Active-low manual reset input | Internally pulled up to VCC1 (50kΩ); drives RST low when asserted; supports TTL/CMOS logic or momentary switch interface |
| 8 - WDI | Watchdog input | Edge-sensitive input clearing watchdog timer on rising/falling transition; floating state does not disable watchdog function |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage monitoring | Simultaneously supervises two factory-set rails (VCC1/VCC2) and one user-adjustable rail (RSTIN), reducing BOM count vs. discrete supervisors |
| Dual-mode watchdog timer | 35s startup delay prevents false timeout during boot, then switches to 1.12s runtime timeout for rapid lockup detection |
| Guaranteed reset validity | Asserts clean, monotonic RST signal down to VCC1 or VCC2 = +0.8V-critical for brownout recovery in low-voltage systems |
| Immunity to VCC transients | Rejects sub-100ns falling glitches on VCC inputs, eliminating spurious resets in noisy power environments |
| Low-power operation | 14µA typical supply current enables >10-year battery life in always-on supervisory applications |
Applications
| Telecom Power Sequencing | Industrial PLC Controller |
|---|---|
|
Use Scenario: Supervising +3.3V backplane, +2.5V PHY, and +1.2V FPGA core rails in a 48V-powered telecom shelf. IC Role / Device Role / Timing Role: MAX6734KASDD3+ monitors VCC1 (+2.925V), VCC2 (+0.788V), and RSTIN (via divider for +1.2V) to generate coordinated reset pulses ensuring safe power-up order. Use Value: Eliminates need for three separate supervisors and discrete timing RC networks, saving 4.5mm² board area and simplifying layout. |
Use Scenario: Ensuring deterministic restart after brownout in a DIN-rail mounted PLC with isolated +24V, +5V, and +3.3V supplies. IC Role / Device Role / Timing Role: MAX6734KASDD3+ uses VCC1 to monitor +24V-derived +3.3V logic rail, VCC2 for +5V I/O rail, and RSTIN for isolated +24V sensor supply. Use Value: 210ms reset timeout matches PLC firmware watchdog window, preventing race conditions between hardware and software reset states. |
| Portable Medical Monitor | Set-Top Box SoC Power Management |
|
Use Scenario: Battery-powered ECG monitor requiring fail-safe reset during Li-ion discharge from 4.2V to 3.0V. IC Role / Device Role / Timing Role: MAX6734KASDD3+ configures VCC1 for +3.3V main rail, VCC2 for +0.788V backup RTC supply, and RSTIN for battery voltage monitoring. Use Value: 14µA quiescent current extends battery runtime by >15% versus comparable supervisors; RSTIN's 626mV threshold enables accurate low-battery warning. |
Use Scenario: Managing power sequencing for ARM-based SoC with +1.1V core, +3.3V I/O, and +12V tuner supply in cable set-top box. IC Role / Device Role / Timing Role: MAX6734KASDD3+ monitors +3.3V I/O (VCC1), +1.1V core (via RSTIN divider), and +12V tuner (via RSTIN divider) with single-chip coordination. Use Value: Open-drain RST/WDO outputs interface directly with SoC's bidirectional reset pin using only a 10kΩ series resistor-no level shifters required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KASD5+ | Same pinout and monitoring architecture, but D5 suffix = 280–560ms reset timeout (vs. D3's 140–280ms) | Suitable for systems requiring longer reset hold time, e.g., DDR memory initialization or complex FPGA bitstream loading | Select MAX6734KASD5+ if timing margin analysis shows >280ms needed for power supply stabilization |
| TPS3808G33DBVR | Single-supply supervisor (only +3.3V monitor), no RSTIN input, push-pull RST, 200ms timeout, 2.5µA IQ | Limited to single-rail monitoring; lacks triple-voltage capability and adjustable input for third rail | Choose TPS3808G33DBVR only for cost-sensitive, single-rail designs where RSTIN functionality is unnecessary |
Compared with MAX6734KASDD3+, MAX6734KASD5+ offers extended reset timing headroom for slower power supplies, while TPS3808G33DBVR trades triple-monitoring capability for ultra-low quiescent current and lower unit cost in single-rail applications.
Availability
MAX6734KASDD3+ is available at Aetrix Electronics and suitable for telecom power sequencing, industrial PLC controllers, and portable medical monitors requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6734KASDD3+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX6730–MAX6735 family was designed to replace discrete reset circuits and multiple single-rail supervisors in multivoltage µP systems, delivering integrated triple monitoring, dual-mode watchdog, and robust glitch immunity in ultra-small packages.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6734KASDD3+?
The MAX6734KASDD3+ has a VCC1 reset threshold of +2.925V (nominal, falling edge), with min/max values of +2.850V/+3.000V over temperature and process variation. This value is factory-trimmed and corresponds to the "S" suffix in the ordering code, enabling precise supervision of +3.3V I/O rails without external calibration. The MAX6734KASDD3+ guarantees this threshold remains stable across its full -40°C to +85°C operating range.
Does the MAX6734KASDD3+ support monitoring a third voltage higher than 626mV?
Yes-the MAX6734KASDD3+ supports monitoring third voltages above 626mV using the RSTIN pin with an external resistor divider. For example, to monitor a +5.0V rail, connect R1 = 6.8kΩ between the rail and RSTIN, and R2 = 1.0kΩ between RSTIN and GND, yielding VRSTIN = 5.0V × (1.0kΩ / (6.8kΩ + 1.0kΩ)) ≈ 641mV. The MAX6734KASDD3+'s 626mV internal reference ensures accurate trip point, and its ≤25nA RSTIN input current minimizes divider error.
What is the watchdog timeout behavior of the MAX6734KASDD3+ during system power-up?
The MAX6734KASDD3+ employs a dual-mode watchdog: it starts with a 35s minimum startup delay after any reset event (power-up, brownout, or MR assertion), allowing ample time for BIOS, bootloader, or FPGA configuration. After the first valid WDI edge, it switches to the normal 1.12s minimum timeout period. This prevents false timeouts during initialization while ensuring rapid lockup detection during steady-state operation-key for reliable deployment of the MAX6734KASDD3+ in safety-critical embedded systems.
Can the MAX6734KASDD3+ RST output interface directly with a microprocessor's bidirectional reset pin?
Yes-the MAX6734KASDD3+ features an open-drain RST output compatible with bidirectional µP reset pins. To prevent logic contention, connect a 10kΩ series resistor between the MAX6734KASDD3+ RST pin and the µP's reset I/O port. This limits current during simultaneous drive and maintains valid logic levels. No additional level-shifting or buffering is required, making the MAX6734KASDD3+ ideal for space-constrained designs using modern SoCs with shared reset/debug pins.
What is the supply current consumption of the MAX6734KASDD3+ at +2.5V operation?
The MAX6734KASDD3+ draws 14µA typical total supply current at +3.6V, and its ICC1/ICC2 components scale linearly with voltage. At +2.5V, typical total supply current is approximately 9.7µA (ICC1 ≈ 6.5µA, ICC2 ≈ 3.2µA), measured per the device's electrical characteristics table. This ultra-low quiescent current enables multi-year operation from coin-cell batteries in always-on monitoring applications, a critical design advantage of the MAX6734KASDD3+ over higher-IQ alternatives.
MAX6734KASDD3+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 3
- Voltage - Threshold:
- 788mV, 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
MAX6734KASDD3+ FAQ
1.How can I place an order for MAX6734KASDD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6734KASDD3+ 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 MAX6734KASDD3+ reliable?
The price and inventory of MAX6734KASDD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6734KASDD3+ is usually 5 days.
3.What payment methods are accepted for MAX6734KASDD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6734KASDD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6734KASDD3+?
MAX6734KASDD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6734KASDD3+ 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 MAX6734KASDD3+?
For technical support, including MAX6734KASDD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6734KASDD3+ requirements.
6.How does Aetrix verify that MAX6734KASDD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6734KASDD3+ 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 MAX6734KASDD3+ meets industry standards.
7.What is the process for return or replacement of MAX6734KASDD3+?
All MAX6734KASDD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6734KASDD3+, 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 MAX6734KASDD3+ part is unused and in its original packaging.
Return procedure for MAX6734KASDD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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