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Analog Devices Inc./Maxim Integrated MAX6456UT26S+T
- Part No.:
- MAX6456UT26S+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6456UT26S+T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,175
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Product details
Overview
The MAX6456UT26S+T from Maxim Integrated is a low-power, dual-voltage µP supervisor IC with separate active-low open-drain VCC reset and manual reset outputs, factory-set 2.625V VCC reset threshold, adjustable RSTIN input (0.63V reference), and 1.68s extended MR setup timeout for soft/hard reset combination control. It operates from 1.0V to 5.5V, draws only 6µA typical supply current, and guarantees valid reset down to VCC = 1.0V.
For engineers reviewing the MAX6456UT26S+T datasheet, MAX6456UT26S+T pinout, MAX6456UT26S+T application, or MAX6456UT26S+T equivalent, this device supports interrupt-before-reset functionality in embedded systems requiring both NMI-triggered data save and full reboot - critical for set-top boxes, medical devices, and industrial equipment where deterministic power sequencing and fault recovery are essential.
Technical Context
The MAX6456UT26S+T implements a dual-comparator architecture: one precision bandgap-based comparator monitors VCC against its fixed 2.625V threshold (±1.5% over temperature), while a second high-impedance comparator monitors RSTIN against a stable 0.63V internal reference, enabling external voltage monitoring via resistor divider. Its MR input controls both MROUT and RESET outputs with a programmable extended setup period (1.68s typ), distinguishing it from MAX6454/MAX6453 variants.
This variant uses open-drain outputs for both RESET and MROUT, requiring external pullup resistors, and features guaranteed reset assertion for VCC ≥ 1.0V, 140ms minimum reset timeout, and immunity to transients ≤ 20µs when VCC dips 100mV below threshold - all specified across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.625V ±1.5% - precisely monitors 2.6V–2.7V primary supply rails without external calibration |
| RSTIN Reference Voltage | 0.630V ±1.6% - enables accurate monitoring of secondary supplies as low as 0.63V using external resistor divider |
| MR Extended Setup Period | 1.68s (typ) - allows single pushbutton to trigger interrupt (short press) or hard reset (long press ≥1.68s) |
| Reset Timeout Period | 140ms (min) - ensures microprocessor reset pulse meets minimum duration requirements for reliable initialization |
| VCC Supply Current | 6µA (typ at 3.6V) - minimizes quiescent power in battery-backed or energy-sensitive applications |
| Operating Temperature | –40°C to +85°C - fully specified for industrial and consumer equipment deployed in uncontrolled environments |
| Output Type | Active-low open-drain - supports level-shifting to logic supplies up to 6V and wired-OR configurations |
Pinout & Package
Package: SOT23-6, surface-mount, lead(Pb)-free (RoHS-compliant), 1.6mm × 2.9mm footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output - asserts low on VCC/RSTIN undervoltage or MR long-press; 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 low 140ms after MR release |
| 4 | VCC | Main power supply input - powers internal circuitry and sets operating voltage range (1.0V–5.5V) |
| 5 | RSTIN | Adjustable reset input - high-impedance node referenced to 0.63V; connects to center tap of external resistor divider |
| 6 | MR | Manual reset input - internally pulled up to VCC (50kΩ); low assertion triggers MROUT, and sustained low (≥1.68s) also asserts RESET |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset paths | Separate VCC and RSTIN comparators enable simultaneous monitoring of primary and secondary system rails |
| Interrupt-before-reset capability | Single MR input delivers immediate MROUT assertion (NMI) on short press and full RESET assertion only after 1.68s hold |
| Ultra-low quiescent current | 6µA typical at 3.6V ensures minimal battery drain in always-on or backup-supply applications |
| Guaranteed reset validity down to VCC = 1.0V | Ensures reliable processor reset initiation even during deep brownout conditions before complete power collapse |
| Transient immunity | Rejects VCC glitches ≤20µs duration when undershoot is ≤100mV - prevents spurious resets in noisy power environments |
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: MAX6456UT26S+T supervises 2.6V LDO output (VCC) and 1.2V core rail (via RSTIN divider), asserting RESET only after both stabilize for 140ms. Use Value: Prevents firmware corruption by ensuring CPU and decoder ICs initialize synchronously after stable power, eliminating boot hangs. |
Use Scenario: Front-panel button interface requiring both menu navigation interrupt and full system reboot. IC Role / Device Role / Timing Role: MAX6456UT26S+T MR input accepts same mechanical switch: <1.68s press triggers MROUT (NMI) for UI save; ≥1.68s triggers RESET for cold restart. Use Value: Eliminates need for dual-button hardware, reducing BOM cost and PCB space while improving user experience. |
| Medical Devices | Industrial Equipment |
Use Scenario: Battery-powered patient monitor with backup SRAM retention and safety-critical reboot on power anomaly. IC Role / Device Role / Timing Role: MAX6456UT26S+T monitors main 3.3V rail (VCC) and backup 1.8V rail (RSTIN), asserting RESET if either drops below threshold for >140ms. Use Value: Guarantees deterministic fail-safe behavior per IEC 62304, preserving vital sensor logs during transient line sags. |
Use Scenario: PLC I/O module exposed to 24V field wiring noise and wide ambient temperature swings. IC Role / Device Role / Timing Role: MAX6456UT26S+T provides robust reset supervision across –40°C to +85°C with 20µs glitch immunity on VCC. Use Value: Maintains system uptime in harsh factory environments where EMI-induced resets would cause production downtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6455UT26S+T | Same 2.625V VCC threshold and 1.68s MR setup, but push-pull RESET/MROUT outputs | Requires no external pullups; unsuitable for level-shifting or wired-OR bus topologies | Select when driving CMOS inputs directly and minimizing external components is prioritized over flexibility |
| MAX6456UT29S+T | Identical package, pinout, and MR timing, but 2.925V VCC reset threshold | Monitors higher primary rail (e.g., 3.0V LDO) instead of 2.6V; not interchangeable without circuit validation | Select only when system VCC nominal is ~3.0V and 2.625V threshold is insufficient for required margin |
Compared with MAX6456UT26S+T, the MAX6455UT26S+T eliminates pullup resistors but sacrifices level-shifting capability, while the MAX6456UT29S+T shifts reset sensitivity upward by 300mV - neither is pin-compatible drop-in replacements without verifying voltage margins and output loading requirements.
Availability
MAX6456UT26S+T is available at Aetrix Electronics and suitable for set-top boxes, medical devices, and industrial equipment requiring stable component supply, RoHS-compliant packaging, and guaranteed long-term availability in tape-and-reel format (2500-piece minimum order).
Supply support for MAX6456UT26S+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 power, sensing, and interface applications, with emphasis on reliability and integration for demanding environments.
The MAX6453–MAX6456 family was engineered specifically for embedded systems needing dual-voltage supervision with configurable reset behavior - targeting consumer, industrial, and medical applications where deterministic power-up, brownout recovery, and user-initiated reset coordination are critical.
FAQ
What is the exact VCC reset threshold voltage for MAX6456UT26S+T?
The MAX6456UT26S+T has a factory-set VCC reset threshold of 2.625V, with ±1.5% tolerance over the full –40°C to +85°C temperature range. This value is laser-trimmed during production and documented in the Electrical Characteristics table under "VCC Reset Threshold" with part suffix "26" corresponding to 2.625V per Table 1 in the datasheet.
Does MAX6456UT26S+T support reset assertion when VCC falls below 1.0V?
No - the MAX6456UT26S+T guarantees valid reset output only down to VCC = 1.0V. Below that voltage, RESET output behavior is not specified, and current-sinking capability degrades rapidly. For applications requiring reset assertion at VCC < 1.0V, an external pulldown resistor cannot be used with the open-drain outputs of MAX6456UT26S+T.
How does the MR input of MAX6456UT26S+T differ from MAX6454UT26S+T?
Unlike MAX6454UT26S+T (which uses MR to control only MROUT), the MR input of MAX6456UT26S+T controls both MROUT and RESET outputs. A short MR low pulse asserts only MROUT; holding MR low for ≥1.68s (extended setup period) additionally asserts RESET - enabling true interrupt-before-reset functionality unique to MAX6455/MAX6456 variants.
What is the purpose of the RSTIN pin on MAX6456UT26S+T?
The RSTIN pin on MAX6456UT26S+T is a high-impedance input referenced to an internal 0.63V comparator threshold. It allows monitoring of a secondary voltage rail (e.g., 1.2V, 1.8V) via an external resistor divider. The monitored voltage VMON_TH is calculated as 0.63V × (R1 + R2)/R2, enabling flexible, low-power supervision of non-primary supplies.
Can MAX6456UT26S+T be used with a 5V microprocessor reset input?
Yes - the open-drain RESET output of MAX6456UT26S+T can interface to 5V logic when paired with a pullup resistor to the 5V supply. The output is rated for up to 6V, and leakage current remains ≤1µA when deasserted. Ensure the pullup value (e.g., 10kΩ) provides sufficient drive strength while respecting the 3.2mA sink capability at VCC ≥ 4.25V.
MAX6456UT26S+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:
- 2.625V, 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-6
MAX6456UT26S+T FAQ
1.How can I place an order for MAX6456UT26S+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6456UT26S+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 MAX6456UT26S+T reliable?
The price and inventory of MAX6456UT26S+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6456UT26S+T is usually 5 days.
3.What payment methods are accepted for MAX6456UT26S+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6456UT26S+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6456UT26S+T?
MAX6456UT26S+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6456UT26S+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 MAX6456UT26S+T?
For technical support, including MAX6456UT26S+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6456UT26S+T requirements.
6.How does Aetrix verify that MAX6456UT26S+T is sourced from the original manufacturer or authorized distributors?
All MAX6456UT26S+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 MAX6456UT26S+T meets industry standards.
7.What is the process for return or replacement of MAX6456UT26S+T?
All MAX6456UT26S+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6456UT26S+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 MAX6456UT26S+T part is unused and in its original packaging.
Return procedure for MAX6456UT26S+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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