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Analog Devices Inc./Maxim Integrated MAX6734KAZWD3+T
- Part No.:
- MAX6734KAZWD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
MAX6734KAZWD3+T.pdf
- Description:
- IC SUPERVISOR MPU W/WD SOT23-8
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
MAX6734KAZWD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring VCC1 (+3.075V threshold), VCC2 (+2.313V threshold), and an adjustable RSTIN input (626mV reference). It features open-drain RST and WDO outputs, manual reset input (MR), and a 140ms–280ms reset timeout period (D3 option). Designed for multivoltage embedded systems requiring reliable power-on reset and system lockup protection.
For engineers reviewing the MAX6734KAZWD3+T datasheet, MAX6734KAZWD3+T pinout, MAX6734KAZWD3+T application, or MAX6734KAZWD3+T equivalent, this page delivers verified electrical parameters, SOT23-8 package mapping, confirmed watchdog timing behavior (35s startup / 1.12s normal mode), reset threshold hysteresis (0.5%), and validated alternative options for dual-supply supervisory designs.
Technical Context
The MAX6734KAZWD3+T implements a triple-threshold supervision architecture: two factory-set voltage monitors (VCC1 = 3.075V, VCC2 = 2.313V) and one high-impedance adjustable comparator (RSTIN = 626mV reference) enabling third-rail monitoring via external resistor divider. Its independent watchdog timer operates in dual-mode-35s minimum startup delay after reset, then 1.12s minimum timeout during normal operation-with WDI edge-triggered clearing.
All supervision logic remains functional down to VCC1 or VCC2 = +0.8V, and the device guarantees valid reset assertion under brownout conditions. The open-drain RST and WDO outputs require external pullups and support noise-immune interfacing with bidirectional μP reset pins via series resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | +3.075V (factory-set, falling-edge detection; supports 3.3V rail monitoring) |
| VCC2 Threshold | +2.313V (factory-set, falling-edge detection; supports 2.5V/2.4V rail monitoring) |
| RSTIN Reference | 626mV ±15.5mV (enables precise third-rail monitoring down to +0.63V via divider) |
| Reset Timeout | 140ms–280ms (D3 option; ensures sufficient hold time for complex boot sequences) |
| Watchdog Startup Delay | 35s min (allows full system initialization before watchdog enforcement begins) |
| Normal Watchdog Timeout | 1.12s min (fast response to software hang without false triggers during transient delays) |
| Supply Current | 15µA typ at +3.6V (ultra-low quiescent current enables battery-backed operation) |
| Operating Temp | −40°C to +85°C (fully specified for industrial-grade reliability) |
Pinout & Package
MAX6734KAZWD3+T is housed in an 8-pin SOT23 package (K8SN+1 outline, JEDEC MO-178AA), measuring 2.9mm × 1.6mm × 1.1mm with 0.65mm pitch. Thermal resistance θJA = 180°C/W on a 4-layer board.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; asserts when VCC1/VCC2/RSTIN drop below threshold or MR is pulled low; requires external pullup |
| 2 | GND | Analog/digital ground reference; must be connected to system ground plane for stable threshold accuracy |
| 3 | WDO | Active-low open-drain watchdog output; asserts if no WDI edge occurs within timeout; requires external pullup |
| 4 | VCC1 | Primary supply input (monitored at +3.075V); powers internal circuitry when ≥ VCC2 |
| 5 | RSTIN | Adjustable reset comparator input; referenced to 626mV internal bandgap; accepts divided-down voltages ≥0.63V |
| 6 | WDI | Watchdog input; edge-sensitive (rising/falling); clears watchdog timer on transition; unconnected = default low via 100kΩ pull-down |
| 7 | MR | Active-low manual reset input; internal 50kΩ pullup to VCC1; 1µs minimum pulse width; debounced by design |
| 8 | VCC2 | Secondary supply input (monitored at +2.313V); powers device when > VCC1; enables dual-rail independence |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneous monitoring of primary (3.075V), secondary (2.313V), and adjustable (626mV ref) rails eliminates need for discrete comparators |
| Dual-mode watchdog timer | 35s startup delay prevents premature timeout during boot; 1.12s normal mode ensures rapid hang detection without excessive polling overhead |
| Immunity to VCC transients | Guaranteed rejection of short-duration falling glitches (e.g., <100ns at 100mV overdrive) avoids spurious resets in noisy power environments |
| Low-voltage reset validity | Functional reset assertion guaranteed down to VCC1/VCC2 = +0.8V, enabling robust brownout handling in deep-sleep states |
| High-impedance RSTIN input | ±25nA leakage enables use of megaohm-level resistor dividers, minimizing standby current in battery-critical applications |
Applications
| Industrial PLC Controller | Network Router Power Management |
|---|---|
|
Use Scenario: Monitoring 3.3V I/O, 2.5V memory, and 1.2V core rails in a fanless industrial controller exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Triple-rail supervisor ensuring synchronized reset across domains and watchdog-enforced firmware recovery during EMI-induced lockups. Use Value: Eliminates discrete reset ICs and reduces BOM count by 2 components while maintaining AEC-Q100-equivalent reliability at −40°C to +85°C. |
Use Scenario: Managing power sequencing and fault recovery in multi-core networking SoC with separate CPU, PHY, and DDR supply domains. IC Role / Device Role / Timing Role: Supervises 3.3V management bus, 2.5V PHY rail, and 1.8V DDR termination voltage; RSTIN monitors adjustable 1.2V core via resistor divider. Use Value: D3 timeout (140–280ms) aligns with DDR initialization timing; open-drain outputs interface cleanly with bidirectional SoC reset pins via 10kΩ isolation resistors. |
| Medical Point-of-Care Device | Automotive Infotainment Module |
|
Use Scenario: Ensuring safe boot and runtime integrity in portable ultrasound equipment powered by Li-ion battery with variable 3.0–4.2V output. IC Role / Device Role / Timing Role: Monitors regulated 3.3V system rail, 2.3V sensor interface, and battery-derived 1.8V analog front-end using RSTIN divider. Use Value: 15µA typical supply current extends battery life; 0.5% reset hysteresis prevents chatter during slow battery discharge near threshold. |
Use Scenario: Providing fail-safe reset and watchdog supervision in head-unit MCU subsystem operating in vehicle cabin (−40°C to +85°C). IC Role / Device Role / Timing Role: Supervises 5V supply (via VCC1 divider), 3.3V domain, and 1.2V core (RSTIN); MR supports service-mode hard reset. Use Value: Matches automotive thermal profile; open-drain outputs tolerate load switching transients; AEC-Q100-qualified variants available (e.g., MAX6734KATGD3/V+T). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KALTD3+T | VCC1 = +2.925V, VCC2 = +2.188V (LT suffix); same D3 timeout, SOT23-8, open-drain outputs | Better matched to 3.0V/2.2V rail pairs; lower VCC1 threshold reduces margin for 3.3V systems | Select when supervising 3.0V main rail and 2.2V peripheral rail; verify reset timing compatibility with target μP's minimum reset pulse width. |
| TPS3808G33DBVR | Single-supply (3.3V only), push-pull RST, no RSTIN or dual-rail monitoring; 200ms timeout, SOT23-6 | Lacks triple-monitoring capability; requires additional ICs for VCC2/RSTIN functions | Use only for single-rail 3.3V systems where cost and footprint are prioritized over multi-rail integration; not a functional replacement for MAX6734KAZWD3+T. |
Compared with MAX6734KALTD3+T, the MAX6734KAZWD3+T provides higher VCC1/VCC2 thresholds better suited for 3.3V/2.5V systems, while TPS3808G33DBVR lacks RSTIN and dual-supply monitoring-making it unsuitable for applications requiring three independent voltage checks.
Availability
MAX6734KAZWD3+T is available at Aetrix Electronics and suitable for industrial PLC controllers, network router power management, medical point-of-care devices, and automotive infotainment modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6734KAZWD3+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MAX6730–MAX6735 family was designed to replace discrete reset circuits and multiple supervisory ICs in multivoltage μP systems-delivering integrated triple-rail monitoring, dual-mode watchdog, and manual reset in ultra-small SOT23 packages.
FAQ
What is the exact reset threshold voltage for VCC1 and VCC2 on the MAX6734KAZWD3+T?
The MAX6734KAZWD3+T has factory-set thresholds: VCC1 = +3.075V (TZ suffix) and VCC2 = +2.313V (ZW suffix), both specified at falling edge with ±125mV tolerance. These values are laser-trimmed during production and guaranteed over −40°C to +85°C. The MAX6734KAZWD3+T datasheet Table 1 confirms TZ/ZW pairing for this specific orderable part number.
Does the MAX6734KAZWD3+T support monitoring a third voltage higher than 0.63V?
Yes-the MAX6734KAZWD3+T includes the RSTIN pin with a fixed 626mV internal reference. To monitor voltages above 0.63V (e.g., 5V, 12V), connect a precision resistor divider between the target rail and GND, feeding the midpoint to RSTIN. The MAX6734KAZWD3+T's high-impedance input (±25nA leakage) ensures minimal loading on the divider network.
What is the watchdog timeout behavior of the MAX6734KAZWD3+T during power-up?
The MAX6734KAZWD3+T implements a dual-mode watchdog: after any reset event (power-up, brownout, or MR assertion), it enforces a 35s minimum startup delay before entering normal mode. Only after this period-or upon detecting the first valid WDI edge-does the timeout reduce to 1.12s minimum. This prevents false timeouts during lengthy system initialization sequences.
Can the MAX6734KAZWD3+T operate reliably when VCC1 drops below 1.0V?
Yes-the MAX6734KAZWD3+T guarantees valid reset assertion down to VCC1 or VCC2 = +0.8V. Below this level, internal circuitry may cease functioning, but the reset output remains asserted as long as supply voltage stays above 0.8V. For operation down to 0V, a 100kΩ pulldown resistor from RST to GND is recommended-but note this conflicts with open-drain topology and is not applicable to MAX6734KAZWD3+T.
Is the MAX6734KAZWD3+T pin-compatible with other MAX6734 variants?
Yes-all MAX6734 variants (e.g., MAX6734KALTD3+T, MAX6734KATGD3/V+T) share identical SOT23-8 pinout and footprint (K8SN+1). Differences are limited to factory-set thresholds (suffix letters), reset timeout (D-suffix), qualification grade (/V), and RoHS status (+T). No PCB layout changes are required when substituting within the MAX6734 family.
MAX6734KAZWD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
MAX6734KAZWD3+T FAQ
1.How can I place an order for MAX6734KAZWD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6734KAZWD3+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 MAX6734KAZWD3+T reliable?
The price and inventory of MAX6734KAZWD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6734KAZWD3+T is usually 5 days.
3.What payment methods are accepted for MAX6734KAZWD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6734KAZWD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6734KAZWD3+T?
MAX6734KAZWD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6734KAZWD3+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 MAX6734KAZWD3+T?
For technical support, including MAX6734KAZWD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6734KAZWD3+T requirements.
6.How does Aetrix verify that MAX6734KAZWD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6734KAZWD3+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 MAX6734KAZWD3+T meets industry standards.
7.What is the process for return or replacement of MAX6734KAZWD3+T?
All MAX6734KAZWD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6734KAZWD3+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 MAX6734KAZWD3+T part is unused and in its original packaging.
Return procedure for MAX6734KAZWD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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