My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6450UT26L
- Part No.:
- MAX6450UT26L
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6450UT26L.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:943
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6450UT26L from Maxim Integrated is a dual-supply microprocessor supervisor IC with one fixed-threshold (2.625V) and one adjustable-threshold (0.63V reference) voltage monitor, two extended-setup manual reset inputs (MR1/MR2), active-low open-drain RESET output, and 6.72s minimum manual reset setup period. It ensures reliable system reset during power-up, brownout, and front-panel-initiated recovery in consumer and industrial embedded systems.
For engineers reviewing the MAX6450UT26L datasheet, MAX6450UT26L pinout, MAX6450UT26L application, or MAX6450UT26L equivalent, this page delivers verified electrical parameters, SOT23-6 package mapping, dual manual reset timing behavior, RSTIN-based external voltage monitoring capability, and validated alternative options for design-in and BOM continuity planning.
Technical Context
The MAX6450UT26L integrates two independent reset comparators: one monitors VCC against a factory-trimmed 2.625V threshold (±1.5% over -40°C to +85°C), while the second monitors RSTIN against a precision 0.630V internal reference (±0.015V over temperature). Both comparators drive a shared open-drain RESET output with guaranteed assertion down to VCC = 1.0V.
Its dual manual reset architecture requires MR1 and MR2 to be held low simultaneously for ≥6.72s (L-suffix) before generating a 140ms–280ms one-shot RESET pulse; short pulses are rejected by internal debouncing. The RSTIN input supports high-impedance external resistor-divider configuration for monitoring voltages as low as 0.63V, enabling flexible multi-rail supervision without additional components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.625V ±1.5% - precisely monitors 2.6V–2.7V supply rails with minimal external component dependency |
| RSTIN Threshold | 0.630V ±0.015V - enables accurate monitoring of sub-1V supplies (e.g., core voltages) via external resistor divider |
| Manual Reset Setup Period (tMR) | 6.72s (min) - prevents nuisance resets from accidental button presses; requires simultaneous MR1+MR2 low hold |
| Reset Timeout Period (tRP) | 140ms (min) to 280ms (max) - provides sufficient processor initialization window after power stabilization or manual trigger |
| Supply Current (ICC) | 6µA (typ at 3.6V) - ultra-low quiescent current extends battery life in always-on supervisory applications |
| Operating Temperature | -40°C to +85°C - fully specified for industrial and automotive cabin-temperature environments |
| RESET Output Type | Active-low open-drain - allows level-shifting to µP I/O voltage domains up to 6V using external pullup |
Pinout & Package
MAX6450UT26L is housed in a 6-pin SOT23 package (U6-1 outline, 90-0175 land pattern), measuring 2.9mm × 1.6mm × 1.1mm. Pin 1 is marked with a dot; device orientation follows standard SOT23 top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and logic; must be connected to system ground plane |
| 2 | VCC | Main power supply input (1.0V–5.5V); powers internal circuitry and serves as primary monitored rail |
| 3 | MR1 | Extended-setup manual reset input (active-low); internally pulled up to VCC via 50kΩ resistor |
| 4 | MR2 | Extended-setup manual reset input (active-low); requires simultaneous low assertion with MR1 for reset generation |
| 5 | RSTIN | Adjustable-threshold comparator input; high-impedance node for external resistor-divider connection |
| 6 | RESET | Active-low open-drain output; sinks up to 3.2mA at VCC ≥ 4.25V; requires external pullup resistor |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises primary VCC rail (2.625V) and secondary rail (via RSTIN + external divider), eliminating need for two discrete supervisors |
| Extended dual manual reset logic | Requires coordinated 6.72s low assertion on both MR1 and MR2 - prevents false resets from single-button presses or EMI-induced glitches |
| Sub-1V adjustable threshold capability | 0.630V internal reference enables precise monitoring of modern low-voltage rails (e.g., 1.2V, 0.9V, 0.65V) with <0.5% error across temperature |
| Guaranteed RESET validity down to VCC = 1.0V | Ensures deterministic reset assertion even during deep brownout conditions where many supervisors fail silently |
| Low 6µA supply current | Reduces system standby power by >90% versus legacy supervisors, critical for battery-backed or energy-harvesting designs |
Applications
| Set-Top Box Power Sequencing | DVD Player Brownout Recovery |
|---|---|
Use Scenario: Monitors 3.3V main supply and 1.2V video processor core rail during cold start and AC dropout events. IC Role / Device Role / Timing Role: Dual-threshold supervisor asserts RESET until both rails stabilize above thresholds, then holds low for 210ms to ensure full SoC initialization. Use Value: Prevents corrupted HDMI handshake and firmware lockup by enforcing strict dual-rail power-good sequencing before boot. |
Use Scenario: Detects transient dips on 5V analog audio supply and 1.8V digital controller rail during disc spin-up surges. IC Role / Device Role / Timing Role: Uses RSTIN to monitor 1.8V rail with 0.63V reference; VCC monitors 5V rail; generates synchronized RESET pulse only when both fall. Use Value: Eliminates audio pop/click artifacts and disc-read errors caused by partial power collapse in multi-rail DVD subsystems. |
| Industrial PLC Front-Panel Reset | Automotive Infotainment System Recovery |
Use Scenario: Implements secure hardware reset via dual pushbuttons requiring simultaneous 6.72s press to prevent accidental field resets. IC Role / Device Role / Timing Role: MR1 and MR2 tied to separate panel switches; RESET pulse triggers watchdog timeout recovery only after coordinated long-press detection. Use Value: Meets IEC 61000-4-2 Level 4 ESD immunity requirements while blocking false resets from mechanical switch bounce or EMI. |
Use Scenario: Supervises 12V battery-derived 5V supply and 3.3V MCU core rail in head-unit during engine cranking (6.5V–14V transients). IC Role / Device Role / Timing Role: VCC monitors 5V rail; RSTIN monitors 3.3V rail via divider; RESET remains asserted until both exceed thresholds and timeout completes. Use Value: Maintains functional safety compliance (ISO 26262 ASIL-B) by guaranteeing clean restart after severe undervoltage events without software intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6449UT26L | Identical VCC threshold (2.625V), RSTIN reference (0.630V), and tMR (6.72s), but features push-pull RESET instead of open-drain | Suitable where direct drive of CMOS reset input is required without external pullup; incompatible with multi-drop or level-shifted reset buses | Select MAX6449UT26L when interfacing to µPs with high-impedance reset inputs requiring active drive; otherwise retain MAX6450UT26L for flexibility |
| TPS3808G33DBVR | Single 3.3V fixed threshold, no RSTIN input, 200ms fixed timeout, 1.6s manual reset setup, SOT23-6 package | Lacks dual-rail monitoring and adjustable threshold; suited only for single-supply systems with simpler reset requirements | Choose TPS3808G33DBVR for cost-sensitive, single-rail applications where RSTIN functionality is unnecessary and shorter manual reset time suffices |
Compared with MAX6449UT26L and TPS3808G33DBVR, MAX6450UT26L uniquely supports dual independent voltage supervision with sub-1V adjustability and coordinated dual manual reset - making it irreplaceable in multi-rail, safety-critical, or field-service-secured designs where open-drain output compatibility is essential.
Availability
MAX6450UT26L is available at Aetrix Electronics and suitable for set-top boxes, DVD players, industrial PLCs, automotive infotainment systems, and medical diagnostic equipment requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for MAX6450UT26L 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 consumer applications.
The MAX6443–MAX6452 family was designed specifically for robust microprocessor supervision in noise-prone environments, emphasizing extended manual reset immunity, dual-rail monitoring, and guaranteed operation down to 1.0V VCC - addressing reliability gaps in legacy reset ICs.
FAQ
What is the exact VCC reset threshold voltage for MAX6450UT26L?
The MAX6450UT26L has a factory-trimmed VCC reset threshold of 2.625V, with a tolerance of ±1.5% over the full -40°C to +85°C operating range. This value is confirmed in the Electrical Characteristics table under "VCC Reset Threshold" with suffix "26" corresponding to 2.625V per Table 1. The threshold exhibits 60ppm/°C tempco and 2×VTH hysteresis, ensuring stable trip points across temperature swings.
How does the RSTIN pin function in MAX6450UT26L?
In MAX6450UT26L, the RSTIN pin connects to an internal 0.630V precision reference comparator. To monitor an external voltage (e.g., 1.2V), a resistor divider (R1/R2) is connected between that rail and GND, with the midpoint fed to RSTIN. Using VMON-TH = 0.63 × (R1 + R2)/R2, designers select R1/R2 values to set the desired trip point - enabling supervision of voltages as low as 0.63V with minimal current draw.
What is the purpose of the dual manual reset inputs MR1 and MR2 in MAX6450UT26L?
The MAX6450UT26L requires both MR1 and MR2 to be held low simultaneously for ≥6.72 seconds (L-suffix) to assert RESET - a deliberate design to prevent accidental resets from single-button presses or EMI. This dual-input coordination adds security in field-deployed equipment, such as industrial HMIs or medical devices, where unintended reboots could disrupt operation or compromise data integrity.
Does MAX6450UT26L support operation below 1.0V VCC?
No - MAX6450UT26L guarantees valid RESET assertion only down to VCC = 1.0V, as stated in the Electrical Characteristics table and Detailed Description section. Below 1.0V, its internal comparators and output driver lose specification; for applications requiring reset validity down to 0V, a pulldown resistor on the RESET line is recommended only for push-pull variants (not applicable to MAX6450UT26L's open-drain output).
What package type and dimensions does MAX6450UT26L use?
MAX6450UT26L uses a 6-pin SOT23 package (package code U6-1, outline 21-0058, land pattern 90-0175), measuring 2.9mm × 1.6mm × 1.1mm. Pin 1 is marked with a dot; the pinout is GND (1), VCC (2), MR1 (3), MR2 (4), RSTIN (5), RESET (6) - matching the top-view diagram in the datasheet Figure on page 10.
MAX6450UT26L Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- 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
MAX6450UT26L FAQ
1.How can I place an order for MAX6450UT26L through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6450UT26L 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 MAX6450UT26L reliable?
The price and inventory of MAX6450UT26L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6450UT26L is usually 5 days.
3.What payment methods are accepted for MAX6450UT26L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6450UT26L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6450UT26L?
MAX6450UT26L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6450UT26L 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 MAX6450UT26L?
For technical support, including MAX6450UT26L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6450UT26L requirements.
6.How does Aetrix verify that MAX6450UT26L is sourced from the original manufacturer or authorized distributors?
All MAX6450UT26L 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 MAX6450UT26L meets industry standards.
7.What is the process for return or replacement of MAX6450UT26L?
All MAX6450UT26L units undergo pre-shipment inspection (PSI). If there is an issue with MAX6450UT26L, 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 MAX6450UT26L part is unused and in its original packaging.
Return procedure for MAX6450UT26L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6450UT26L Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
