My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6445UK26L
- Part No.:
- MAX6445UK26L
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6445UK26L.pdf
- Description:
- IC SUPERVISOR UP RESET CIRCUIT
- Quantity:
- Payment:
- Shipping:
Inventory:2,354
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6445UK26L from Maxim Integrated is a dual-manual-reset, fixed-threshold microprocessor supervisor IC with 2.625V VCC reset threshold, 6.72s extended MR1/MR2 setup period, and 140ms minimum reset timeout. It monitors a single supply (VCC) and provides active-low push-pull RESET output for reliable power-on/power-down/brownout detection in consumer and industrial embedded systems.
For engineers reviewing the MAX6445UK26L datasheet, MAX6445UK26L pinout, MAX6445UK26L application, or MAX6445UK26L equivalent, this page delivers verified electrical parameters, SOT23-5 package mapping, dual extended manual reset timing behavior, and real-world use cases including interrupt-before-reset and front-panel reset coordination.
Technical Context
The MAX6445UK26L implements dual independent manual reset inputs (MR1 and MR2), both requiring simultaneous low assertion for ≥6.72s to trigger a one-shot RESET pulse. Its internal 50kΩ pullup on each MR input eliminates external biasing. The device guarantees valid RESET down to VCC = 1.0V and features 6µA typical supply current at 3.6V.
It uses precision bandgap-based voltage monitoring with ±1.5% reset threshold accuracy over -40°C to +85°C and 60ppm/°C tempco. The 210ms typical reset timeout period remains stable across temperature, with <±5% variation from -40°C to +85°C per typical operating characteristics.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.625V ±1.5% - precisely holds system reset until main supply stabilizes above nominal 2.6V rail |
| Manual Reset Setup Period (tMR) | 6.72s - prevents nuisance resets from brief front-panel button presses; requires sustained dual-button press |
| Reset Timeout Period (tRP) | 140ms (min), 210ms (typ) - ensures µP completes full reset initialization before release |
| Supply Current (ICC) | 6µA typ at 3.6V - enables always-on supervision in battery-backed or ultra-low-power systems |
| Operating Voltage Range | 1.0V to 5.5V - supports valid RESET assertion even during deep brownout down to 1V VCC |
| Output Type | Active-low push-pull - drives RESET directly without external pullup; sinks 3.2mA at VCC ≥4.25V |
| Package | 5-pin SOT23 - footprint-compatible with industry-standard compact PCB layouts; RoHS-compliant |
Pinout & Package
MAX6445UK26L is housed in a 5-pin SOT23 package (package code U5-1, outline 21-0057), optimized for space-constrained applications. Pin 1 is GND; pin 2 is VCC; pin 3 is MR1; pin 4 is MR2; pin 5 is RESET. All pins are rated for -0.3V to +6V absolute max, with MR1/MR2 featuring internal 50kΩ pullups to VCC.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for all internal comparators and output driver; must be low-impedance |
| VCC (Pin 2) | Main supply input | Power source and primary monitored voltage; RESET asserts when VCC falls below 2.625V |
| MR1 (Pin 3) | Extended manual reset input | Active-low input requiring ≥6.72s low assertion; internally pulled up to VCC via 50kΩ |
| MR2 (Pin 4) | Extended manual reset input | Active-low input requiring ≥6.72s low assertion; both MR1 and MR2 must be low simultaneously |
| RESET (Pin 5) | Active-low push-pull output | Drives µP reset pin low for 140ms min; no external pullup needed; valid down to VCC = 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Dual extended manual reset inputs | MR1 and MR2 both require simultaneous 6.72s low assertion - prevents accidental reset from single-button press |
| Precision fixed reset threshold | 2.625V ±1.5% over -40°C to +85°C - eliminates need for external resistor divider calibration |
| Ultra-low quiescent current | 6µA typical at 3.6V - extends battery life in always-on supervisory applications |
| Guaranteed RESET validity to 1.0V VCC | Ensures deterministic reset behavior during deep brownout - critical for fail-safe embedded operation |
| Immunity to short transients | Rejects ≤20µs VCC glitches down to 100mV below threshold - avoids spurious resets from noise or coupling |
Applications
| Consumer Set-Top Box Reset Coordination | Industrial PLC Power-Up Sequencing |
|---|---|
Use Scenario: Front-panel "reset" function requires dual-button press (e.g., power + menu) to avoid accidental activation during normal operation. IC Role / Device Role / Timing Role: MAX6445UK26L acts as dual-input manual reset arbiter and VCC supervisor, asserting RESET only after both MR1 and MR2 are held low ≥6.72s. Use Value: Eliminates field-reported nuisance resets while enabling intentional recovery via deliberate user action - improves product reliability and serviceability. |
Use Scenario: Programmable logic controller powers up multiple voltage rails with staggered sequencing; main µP must not execute until all supplies stabilize. IC Role / Device Role / Timing Role: MAX6445UK26L monitors primary 2.6V logic rail and holds µP in reset until VCC exceeds 2.625V and remains stable for 210ms. Use Value: Prevents code corruption and undefined state during incomplete power ramp-up - ensures deterministic boot across temperature and line-voltage variations. |
| Medical Device Brownout Recovery | Automotive Infotainment System Interrupt/Reset Dual Mode |
Use Scenario: Portable diagnostic equipment operates from Li-ion battery; voltage sags below 2.6V during high-current pulse events trigger supervised recovery. IC Role / Device Role / Timing Role: MAX6445UK26L detects VCC drop below 2.625V and asserts RESET for 140ms min, forcing controlled restart after sag ends. Use Value: Guarantees safe shutdown and restart without data loss or hardware damage - meets IEC 60601-1 safety requirements for medical electronics. |
Use Scenario: Infotainment head unit uses same front-panel button for soft interrupt (short press) and hard reset (long press); system must distinguish intent. IC Role / Device Role / Timing Role: MAX6445UK26L's 6.72s MR1/MR2 setup period allows short presses (<6.72s) to be ignored, while long presses trigger RESET. Use Value: Enables single-button dual-function interface without additional GPIO or firmware debounce logic - reduces BOM and software complexity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6446UK26L | Identical specs except open-drain RESET output instead of push-pull | Requires external pullup resistor; better suited for level-shifting or wired-OR configurations | Select MAX6446UK26L only if interfacing to non-VCC logic domains or sharing RESET bus with other open-drain drivers |
| MAX6445UK26+T | Same electrical specs and timing; lead-free (RoHS-compliant) packaging variant | No functional difference; required for compliance with environmental regulations in EU/China markets | Choose MAX6445UK26+T for new designs targeting RoHS certification; standard -T version remains viable for legacy production |
Compared with MAX6446UK26L, MAX6445UK26L simplifies layout by eliminating the pullup resistor, while MAX6445UK26+T offers identical performance with compliant materials - both preserve the 6.72s dual-MR timing and 2.625V threshold critical for coordinated reset behavior.
Availability
MAX6445UK26L is available at Aetrix Electronics and suitable for consumer electronics, industrial control, and medical device applications requiring stable component supply, guaranteed -40°C to +85°C operation, and long manual reset setup immunity.
Supply support for MAX6445UK26L 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 low-power operation.
The MAX6443–MAX6452 family was engineered specifically for robust microprocessor supervision in noisy, thermally variable environments - delivering precise reset thresholds, extended manual reset immunity, and ultra-low ICC for always-on embedded systems.
FAQ
What is the exact reset threshold voltage of the MAX6445UK26L?
The MAX6445UK26L 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 confirmed in Table 1 of the datasheet (suffix "26") and is laser-trimmed during production for precision. The MAX6445UK26L maintains this threshold stability with only 60ppm/°C tempco, ensuring consistent behavior across thermal conditions.
How does the dual manual reset function work on the MAX6445UK26L?
The MAX6445UK26L requires both MR1 (pin 3) and MR2 (pin 4) to be held low simultaneously for ≥6.72 seconds (per suffix "L") before asserting RESET. Neither input alone triggers reset - both must meet the extended setup period. This dual-input requirement prevents accidental resets from single-button presses and is ideal for service-mode entry or secure recovery functions.
Does the MAX6445UK26L support operation below 1.8V VCC?
Yes, the MAX6445UK26L is fully specified down to VCC = 1.0V. Its RESET output remains valid and actively driven (push-pull) even at 1.0V, with VOL ≤0.3V at ISINK = 50µA. This capability ensures deterministic reset behavior during deep brownout conditions where many supervisors fail - a key differentiator of the MAX6445UK26L.
What package type and pin count does the MAX6445UK26L use?
The MAX6445UK26L uses a 5-pin SOT23 package (package code U5-1, outline 21-0057), with pin 1 = GND, pin 2 = VCC, pin 3 = MR1, pin 4 = MR2, and pin 5 = RESET. This compact surface-mount footprint measures 2.9mm × 1.6mm × 1.1mm and is compatible with standard reflow profiles, including lead-free soldering at +260°C.
Can the MAX6445UK26L monitor a voltage other than VCC?
No - the MAX6445UK26L monitors only the VCC supply. It belongs to the MAX6443–MAX6448 subgroup, which lacks the RSTIN pin. For adjustable-voltage monitoring, select MAX6449–MAX6452 variants (e.g., MAX6449UT26L), which include a dedicated RSTIN input with 0.63V threshold and external resistor-divider support. The MAX6445UK26L is strictly a single-fixed-threshold VCC supervisor.
MAX6445UK26L Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6445UK26L FAQ
1.How can I place an order for MAX6445UK26L through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6445UK26L 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 MAX6445UK26L reliable?
The price and inventory of MAX6445UK26L are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6445UK26L is usually 5 days.
3.What payment methods are accepted for MAX6445UK26L?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6445UK26L transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6445UK26L?
MAX6445UK26L orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6445UK26L 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 MAX6445UK26L?
For technical support, including MAX6445UK26L datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6445UK26L requirements.
6.How does Aetrix verify that MAX6445UK26L is sourced from the original manufacturer or authorized distributors?
All MAX6445UK26L 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 MAX6445UK26L meets industry standards.
7.What is the process for return or replacement of MAX6445UK26L?
All MAX6445UK26L units undergo pre-shipment inspection (PSI). If there is an issue with MAX6445UK26L, 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 MAX6445UK26L part is unused and in its original packaging.
Return procedure for MAX6445UK26L:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6445UK26L 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…
