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Analog Devices Inc./Maxim Integrated MAX6456UT31S+T
- Part No.:
- MAX6456UT31S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6456UT31S+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,294
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Product details
Overview
The MAX6456UT31S+T from Maxim Integrated is a low-power, dual-voltage microprocessor supervisor IC with separate active-low open-drain VCC reset and manual reset outputs. It monitors primary supply (VCC) at 3.075V threshold and secondary supply via adjustable RSTIN input down to 0.63V, supports soft/hard system reset combination via extended MR setup period (3.36s typ), and operates across -40°C to +85°C in SOT23-6 package for embedded power sequencing in consumer electronics.
For engineers reviewing the MAX6456UT31S+T datasheet, MAX6456UT31S+T pinout, MAX6456UT31S+T application, or MAX6456UT31S+T equivalent, this page delivers verified functional behavior, exact reset timing values, confirmed dual-output control logic, and real-world implementation constraints for reliable system-level reset design.
Technical Context
The MAX6456UT31S+T implements a dual-comparator architecture: one factory-set precision comparator for VCC monitoring at 3.075V ±1.5% and a high-impedance adjustable comparator on RSTIN referenced to 0.630V ±15mV. Its MR input controls both MROUT and RESET outputs - short MR assertion (<3.36s) triggers only MROUT (soft interrupt), while sustained MR assertion (≥3.36s) asserts both outputs for full system reboot.
This device uses BiCMOS process technology, guarantees valid reset output down to VCC = 1.0V, and features 140ms minimum reset timeout with <6µA typical supply current at 3.6V. The open-drain outputs require external pullups and support level-shifting up to 6V, enabling interoperability with mixed-voltage microprocessor reset inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 3.075V ±1.5% - precisely sets brownout detection point for 3.3V systems without external components |
| RSTIN Threshold | 0.630V ±15mV - enables monitoring of secondary supplies (e.g., 1.2V, 1.8V cores) via external resistor divider |
| MR Setup Period | 3.36s typical - defines minimum MR low pulse duration required to assert both MROUT and RESET outputs |
| Reset Timeout | 140ms minimum - ensures sufficient processor hold time after voltage recovery before deassertion |
| Supply Current | 6µA typical at 3.6V - minimizes quiescent power impact in battery-backed or always-on subsystems |
| Operating Temp | -40°C to +85°C - fully specified for industrial and consumer equipment operating environments |
| Output Type | Active-low open-drain RESET and MROUT - allows flexible pullup voltage selection and wired-OR connectivity |
Pinout & Package
Package: SOT23-6, surface-mount, lead(Pb)-free (indicated by "+T" suffix), 1.6mm × 2.9mm footprint, thermal pad not included.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output - asserts when VCC or RSTIN falls below threshold or MR held ≥3.36s; requires external pullup |
| 2 | GND | Ground reference - common return path for all internal circuitry and external bias networks |
| 3 | MROUT | Active-low open-drain manual reset output - asserts immediately on MR low; remains asserted 140ms after MR release |
| 4 | VCC | Main power supply input - powers internal circuitry and sets reference for VCC monitor; operates from 1.0V to 5.5V |
| 5 | RSTIN | Adjustable reset input - high-impedance node (±25nA leakage) for external resistor divider to set secondary supply threshold |
| 6 | MR | Manual reset input - internally pulled up to VCC (50kΩ); low assertion initiates MROUT, and sustained low triggers RESET |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | Separate MROUT (immediate interrupt) and RESET (delayed hard reset) enable staged system recovery without firmware intervention |
| Extended MR setup period | 3.36s typical window allows single pushbutton to serve both NMI interrupt and full reboot functions in same hardware |
| Adjustable secondary monitoring | RSTIN input with 0.63V reference supports precise threshold setting for any supply ≥0.63V using two high-value resistors |
| Low-power operation | 6µA typical ICC at 3.6V enables use in energy-sensitive applications such as portable media players and set-top boxes |
| Brownout immunity | Guaranteed valid reset assertion down to VCC = 1.0V ensures reliable operation during deep undervoltage conditions |
Applications
| Set-Top Boxes | DVD Players |
|---|---|
Use Scenario: Power-up sequencing and brownout recovery in multi-rail AV systems with 3.3V I/O and 1.2V core supplies. IC Role / Device Role / Timing Role: MAX6456UT31S+T supervises main 3.3V rail and adjusts RSTIN to monitor 1.2V core via resistor divider; generates timed reset pulses to SoC and audio codec. Use Value: Prevents corrupted boot sequences by holding SoC in reset until both rails stabilize, with 140ms timeout ensuring adequate capacitor discharge/recharge margin. |
Use Scenario: Front-panel pushbutton used for both menu navigation interrupt and forced system reboot. IC Role / Device Role / Timing Role: MAX6456UT31S+T interprets short button press (<3.36s) as NMI to save playback state, and long press (≥3.36s) as full hardware reset. Use Value: Eliminates need for separate interrupt and reset buttons, reducing BOM count and front-panel complexity while maintaining deterministic response. |
| Cable/DSL Modems | Medical Devices |
Use Scenario: Remote firmware update recovery where power interruption may occur mid-write. IC Role / Device Role / Timing Role: MAX6456UT31S+T monitors 3.3V management rail and 1.8V PHY supply; asserts RESET only after both recover and sustain 140ms timeout. Use Value: Ensures flash memory write integrity by preventing premature CPU execution before power rails settle post-interruption. |
Use Scenario: Patient-monitoring equipment requiring fail-safe power-on initialization and emergency reset capability. IC Role / Device Role / Timing Role: MAX6456UT31S+T provides guaranteed reset assertion down to VCC = 1.0V and supports LED indicator tied to RESET for visual fault signaling. Use Value: Meets IEC 60601-1 requirements for deterministic startup and operator-initiated safe shutdown without risk of partial initialization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6455UT31S+T | Same VCC threshold (3.075V), same RSTIN reference (0.63V), but push-pull RESET/MROUT outputs instead of open-drain | Requires no external pullups; incompatible with wired-OR or level-shifted reset buses | Select MAX6455UT31S+T only if system uses single-supply reset distribution and no shared reset bus |
| TPS3808G33DBVR | Single-output (RESET only), fixed 3.3V threshold, 200ms timeout, 1.4µA ICC, SOT23-6 package | Lacks manual reset output and adjustable secondary monitoring; no soft-reset interrupt capability | Choose TPS3808G33DBVR only for cost-sensitive, single-rail applications where dual outputs and MR-controlled staging are unnecessary |
Compared with MAX6456UT31S+T, MAX6455UT31S+T simplifies board layout by eliminating pullup resistors but sacrifices bus-sharing flexibility, while TPS3808G33DBVR reduces component count and power draw at the expense of system-level reset staging and secondary supply supervision.
Availability
MAX6456UT31S+T is available at Aetrix Electronics and suitable for set-top boxes, DVD players, and cable/DSL modems requiring stable component supply, industrial temperature operation, and dual-output reset control with adjustable secondary monitoring.
Supply support for MAX6456UT31S+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 is a semiconductor company specializing in analog and mixed-signal ICs for power management, interface, sensing, and reliability-critical applications.
The MAX6453–MAX6456 family was designed specifically for robust, low-power microprocessor supervision in consumer and industrial systems requiring dual independent reset outputs and flexible voltage monitoring.
FAQ
What is the exact VCC reset threshold voltage for MAX6456UT31S+T?
The MAX6456UT31S+T has a factory-set VCC reset threshold of 3.075V, with tolerance of ±1.5% over temperature. This value is fixed per part number suffix "31" and is guaranteed across the full -40°C to +85°C operating range. The threshold exhibits 60ppm/°C tempco, resulting in ≤±0.5% drift over temperature extremes. This precise value targets 3.3V nominal supply systems for reliable brownout detection without calibration.
How does the manual reset input function on MAX6456UT31S+T?
On the MAX6456UT31S+T, the MR input controls both MROUT and RESET outputs. Pulling MR low immediately asserts MROUT. If MR remains low for ≥3.36s (typical extended setup period), RESET also asserts. After MR is released, both outputs remain low for ≥140ms before deasserting. This dual-stage behavior enables one pushbutton to trigger either an interrupt (short press) or full reboot (long press), with no external timing components required.
Can MAX6456UT31S+T monitor a 1.2V supply, and how is it configured?
Yes, MAX6456UT31S+T can monitor a 1.2V supply using its RSTIN pin. Connect RSTIN to the center tap of a resistor divider between the 1.2V rail and ground. With RSTIN's internal 0.630V threshold, select R1 and R2 such that 1.2V × R2/(R1+R2) = 0.630V - e.g., R2 = 250kΩ, R1 ≈ 226kΩ. The high-impedance input (±25nA leakage) minimizes divider current, preserving efficiency while enabling accurate secondary supply supervision.
What are the absolute maximum ratings for MAX6456UT31S+T's supply and I/O pins?
The MAX6456UT31S+T has absolute maximum ratings of VCC = -0.3V to +6V, MR and RSTIN = -0.3V to +6V, and open-drain RESET/MROUT = -0.3V to +6V. Input current on any pin must not exceed ±20mA. Continuous power dissipation is 696mW at +70°C (derated 8.7mW/°C above), junction temperature must stay ≤+150°C, and storage temperature range is -65°C to +150°C. Exceeding these limits risks permanent damage.
Is MAX6456UT31S+T compatible with 1.8V microprocessor reset inputs?
Yes, MAX6456UT31S+T is compatible with 1.8V µP reset inputs via its open-drain outputs. Connect the RESET and MROUT pins to a 1.8V pullup supply (not VCC). When asserted, the outputs sink current to GND; when deasserted, they float, allowing the 1.8V pullup to define the high state. This level-shifting capability supports mixed-voltage systems without additional logic, provided VCC remains ≥1.0V for internal operation.
MAX6456UT31S+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 3.075V, 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-6
MAX6456UT31S+T FAQ
1.How can I place an order for MAX6456UT31S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6456UT31S+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 MAX6456UT31S+T reliable?
The price and inventory of MAX6456UT31S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6456UT31S+T is usually 5 days.
3.What payment methods are accepted for MAX6456UT31S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6456UT31S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6456UT31S+T?
MAX6456UT31S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6456UT31S+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 MAX6456UT31S+T?
For technical support, including MAX6456UT31S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6456UT31S+T requirements.
6.How does Aetrix verify that MAX6456UT31S+T is sourced from the original manufacturer or authorized distributors?
All MAX6456UT31S+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 MAX6456UT31S+T meets industry standards.
7.What is the process for return or replacement of MAX6456UT31S+T?
All MAX6456UT31S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6456UT31S+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 MAX6456UT31S+T part is unused and in its original packaging.
Return procedure for MAX6456UT31S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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