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Analog Devices Inc./Maxim Integrated MAX6734KALTD3+T
- Part No.:
- MAX6734KALTD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6734KALTD3+T.pdf
- Description:
- IC SUPERVISOR 3 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,717
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Product details
Overview
The MAX6734KALTD3+T from Maxim Integrated is a triple-voltage microprocessor supervisor IC with independent watchdog output, monitoring +4.625V (VCC1), +3.075V (VCC2), and an adjustable input down to +0.63V via RSTIN. It features open-drain RST and WDO outputs, 140–280ms reset timeout, manual reset input, and operates across –40°C to +85°C - used in multivoltage telecom and industrial systems for reliable power-on and brownout detection.
For engineers reviewing the MAX6734KALTD3+T datasheet, MAX6734KALTD3+T pinout, MAX6734KALTD3+T application, or MAX6734KALTD3+T equivalent, key selection criteria include its dual fixed-threshold + adjustable third-voltage supervision, AEC-Q100-qualified automotive variant availability, SOT23-8 package footprint, and compatibility with bidirectional μP reset pins using series current-limiting resistors.
Technical Context
The MAX6734KALTD3+T implements three independent voltage monitors: two factory-set comparators (VTH1 = 4.625V, VTH2 = 3.075V) and one high-impedance adjustable comparator (VRSTIN = 626.5mV) referenced to an internal bandgap. Its reset logic asserts active-low RST when any monitored voltage falls below threshold, with hysteresis (0.5%) and guaranteed validity down to VCC ≥ +0.8V.
The watchdog subsystem includes a dual-mode timer: 35s minimum startup delay after reset, then 1.12s minimum normal timeout; WDI edge detection clears the timer, while WDO provides independent open-drain fault signaling. MR input has 50kΩ internal pullup and 1µs minimum pulse width support.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC1 Threshold | 4.625V (factory-set; monitors primary supply like +5V rails) |
| VCC2 Threshold | 3.075V (factory-set; monitors secondary supply like +3.3V rails) |
| RSTIN Threshold | 626.5mV (adjustable via external divider; enables monitoring of +1.2V, +1.8V, etc.) |
| Reset Timeout | 140–280ms (D3 option; ensures sufficient hold time for μP initialization) |
| Supply Current | 15µA typ at +3.6V (ultra-low quiescent current extends battery life in portable systems) |
| Operating Temp | –40°C to +85°C (fully specified for industrial and automotive under-hood environments) |
| Watchdog Startup | 35s min after reset (allows full system boot before watchdog enforcement begins) |
| WDI Sensitivity | Detects rising/falling edges only; no level-only timeout (prevents false resets during static firmware states) |
Pinout & Package
MAX6734KALTD3+T is housed in an 8-pin SOT23-8 package (JEDEC MO-178AA), measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS-compliant lead-free plating (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RST | Active-low open-drain reset output; requires external pullup; asserts on VCC1/VCC2/RSTIN undervoltage or MR low |
| 2 | GND | Ground reference for all internal comparators and logic; must be low-impedance connection |
| 3 | VCC2 | Secondary supply input; powers VCC2 monitor and contributes to device biasing when > VCC1 |
| 4 | MR | Active-low manual reset input; internally pulled up to VCC1 (50kΩ); debounced by design |
| 5 | RSTIN | Adjustable reset comparator input; high-impedance (±25nA); referenced to 626.5mV internal reference |
| 6 | WDI | Watchdog input; edge-triggered; clears timer on rising/falling transition; unconnected = default low via 100kΩ resistor |
| 7 | WDO | Active-low open-drain watchdog output; asserts if WDI idle > 1.12s (normal mode) or >35s (startup mode) |
| 8 | VCC1 | Primary supply input; powers core logic and VCC1 monitor; dominant supply when > VCC2 |
Key Features
| Feature | Design Value |
|---|---|
| Triple-voltage supervision | Simultaneously monitors two fixed supplies (+4.625V, +3.075V) and one user-adjustable rail (down to +0.63V), reducing BOM count vs. discrete supervisors |
| Independent watchdog output | WDO provides dedicated fault signaling without sharing RST line - enables separate system-level watchdog recovery actions |
| Immunity to VCC transients | Rejects short-duration falling glitches (e.g., <100ns at 100mV overdrive), preventing spurious resets in noisy power environments |
| Guaranteed reset down to 0.8V | Ensures valid RST assertion even during deep brownout conditions where VCC drops near operational floor |
| AEC-Q100 qualified variant | MAX6734KALTD3/V+T version meets automotive stress testing (Grade 3: –40°C to +85°C), supporting infotainment and body control modules |
Applications
| Telecom Power Sequencing | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring +48V DC-DC derived +3.3V, +5V, and +1.2V rails in base station power management units. IC Role / Device Role / Timing Role: Supervisor IC providing coordinated power-good signaling and reset hold-off during cold-start sequencing. Use Value: Eliminates need for three discrete reset ICs; D3 timeout (140–280ms) aligns with FPGA configuration timing windows. | Use Scenario: Supervising dual isolated +24V and +5V supplies plus field I/O voltage in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Triple-threshold detector triggering system-wide reset upon undervoltage on any rail, with MR enabling operator-initiated diagnostics. Use Value: Open-drain RST/WDO outputs interface directly with optocoupled isolation stages; low 15µA ICC enables always-on monitoring. |
| Automotive Infotainment Head Unit | Battery-Powered Medical Monitor |
Use Scenario: Validating +5V USB host, +3.3V SoC core, and +1.8V display interface rails in AEC-Q100-compliant head units. IC Role / Device Role / Timing Role: Automotive-grade supervisor ensuring safe boot and brownout recovery for ARM-based multimedia processors. Use Value: AEC-Q100 qualification (via /V+T variant) satisfies functional safety requirements; RSTIN monitors auxiliary sensor supply independently. | Use Scenario: Supervising +3.3V MCU, +2.8V OLED display, and +1.2V ADC reference in portable ECG devices powered by Li-ion cells. IC Role / Device Role / Timing Role: Low-power supervisor maintaining reset integrity during battery sag events and enabling manual recalibration reset. Use Value: 15µA typical supply current extends runtime between charges; MR input supports tactile reset button without external pullup. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triple-voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6734KATGD3+T | VCC1 = 1.665V, VCC2 = 1.110V (TG suffix); same D3 timeout, SOT23-8, open-drain outputs | Targeted at low-voltage SoC platforms (e.g., +1.8V/1.2V/1.0V rails), not +4.6V/+3.0V systems | Select only if monitoring sub-2V supplies; incompatible with +4.625V primary rail requirement of MAX6734KALTD3+T |
| TPS3808G33DBVR | Single-supply supervisor (3.3V threshold only); no RSTIN input; push-pull RST; 200ms timeout | Lacks dual fixed + adjustable monitoring; requires additional ICs to match triple-rail coverage | Use only for single-rail applications; cannot replace MAX6734KALTD3+T without redesigning supervision architecture |
Compared with MAX6734KALTD3+T, the MAX6734KATGD3+T serves different voltage ranges and the TPS3808G33DBVR lacks triple-monitor capability - neither offers drop-in replacement for +4.625V/+3.075V + adjustable supervision in SOT23-8.
Availability
MAX6734KALTD3+T is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and automotive infotainment systems requiring stable component supply, long-lifecycle support, and AEC-Q100-qualified alternatives.
Supply support for MAX6734KALTD3+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, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX6730–MAX6735 family delivers integrated triple-voltage supervision with independent watchdog functionality - engineered for reliability-critical embedded systems where simultaneous multi-rail monitoring and fail-safe processor recovery are mandatory.
FAQ
What is the exact reset threshold voltage for VCC1 on the MAX6734KALTD3+T?
The MAX6734KALTD3+T has a factory-set VCC1 reset threshold of 4.625V (typical), with guaranteed range 4.500V to 4.750V at 25°C. This value is defined by the "LT" suffix per Maxim's Reset Voltage Threshold Suffix Guide and applies specifically to the MAX6734KALTD3+T - not to other variants in the MAX6734 family.
Does the MAX6734KALTD3+T support manual reset functionality?
Yes, the MAX6734KALTD3+T includes an active-low manual reset input (MR) with internal 50kΩ pullup to VCC1. Driving MR low forces RST assertion for the full reset timeout period (140–280ms), clears the watchdog timer, and deasserts WDO. The MR pin accepts TTL/CMOS logic levels and requires no external components for basic operation.
What package type and dimensions does the MAX6734KALTD3+T use?
The MAX6734KALTD3+T uses an 8-pin SOT23-8 package (JEDEC MO-178AA), measuring 2.9mm × 1.6mm × 1.1mm with gull-wing leads. It is RoHS-compliant and lead-free (indicated by the "+T" suffix), and shares footprint compatibility with other MAX6734/MAX6735 variants in the same package family.
Can the MAX6734KALTD3+T monitor a +1.8V supply using the RSTIN pin?
Yes, the MAX6734KALTD3+T can monitor a +1.8V supply via RSTIN by connecting a resistive voltage divider that scales +1.8V down to its internal 626.5mV threshold. For example, R1 = 182kΩ and R2 = 100kΩ yields VRSTIN = 1.8V × 100/(100+182) ≈ 638mV - within the ±15mV tolerance window and compatible with the 3mV hysteresis spec.
Is the MAX6734KALTD3+T qualified for automotive applications?
The base MAX6734KALTD3+T is rated for –40°C to +85°C but is not AEC-Q100 qualified. However, the automotive-grade variant MAX6734KALTD3/V+T - identical in electrical specs and pinout - is AEC-Q100 Grade 3 qualified and intended for automotive infotainment and body electronics where extended temperature and reliability validation are required.
MAX6734KALTD3+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:
- 3.075V, 4.625V, 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
MAX6734KALTD3+T FAQ
1.How can I place an order for MAX6734KALTD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6734KALTD3+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 MAX6734KALTD3+T reliable?
The price and inventory of MAX6734KALTD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6734KALTD3+T is usually 5 days.
3.What payment methods are accepted for MAX6734KALTD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6734KALTD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6734KALTD3+T?
MAX6734KALTD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6734KALTD3+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 MAX6734KALTD3+T?
For technical support, including MAX6734KALTD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6734KALTD3+T requirements.
6.How does Aetrix verify that MAX6734KALTD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6734KALTD3+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 MAX6734KALTD3+T meets industry standards.
7.What is the process for return or replacement of MAX6734KALTD3+T?
All MAX6734KALTD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6734KALTD3+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 MAX6734KALTD3+T part is unused and in its original packaging.
Return procedure for MAX6734KALTD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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