My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6445UK23L+
- Part No.:
- MAX6445UK23L+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6445UK23L+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:869
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6445UK23L+ from Maxim Integrated is a dual manual reset, fixed-threshold microprocessor supervisor IC with active-low push-pull RESET output. It monitors a single supply (VCC) at 2.313V threshold, features 6.72s extended MR1/MR2 setup period, 210ms typical reset timeout, and operates over –40°C to +85°C in 5-pin SOT23 package. It is used in set-top boxes and cable modems to prevent nuisance resets from front-panel button presses.
For engineers reviewing the MAX6445UK23L+ datasheet, MAX6445UK23L+ pinout, MAX6445UK23L+ application, or MAX6445UK23L+ equivalent, key selection criteria include confirmed dual extended-setup manual reset inputs, precise 2.313V VCC threshold, guaranteed reset assertion down to VCC = 1.0V, low 6µA supply current, and SOT23-5 package compatibility with industrial and consumer power-management layouts.
Technical Context
The MAX6445UK23L+ implements a precision bandgap-based voltage monitor for VCC with factory-trimmed 2.313V reset threshold and 60ppm/°C tempco. Its dual manual reset inputs (MR1 and MR2) require simultaneous low assertion for ≥6.72s to trigger a one-shot RESET pulse - a timing architecture designed to reject transient switch bounce and accidental presses.
RESET output is push-pull active-low, guaranteed functional from VCC = 1.0V, with 20µs VCC-to-RESET delay and <0.3V VOL at 1.2V VCC/100µA sink. Internal 50kΩ pullups on MR1/MR2 eliminate external biasing, and the device is fully specified across –40°C to +85°C with no derating required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 2.313V ±0.075V - precisely sets brownout detection point for 2.5V or 3.3V systems with minimal external component dependency |
| Reset Timeout Period | 140ms min / 210ms typ - ensures sufficient processor initialization time before release, compatible with common µP reset timing requirements |
| Manual Reset Setup Period | 6.72s typ - prevents false resets from brief front-panel switch closures; requires simultaneous MR1+MR2 low for full duration |
| VCC Supply Current | 6µA typ at 3.6V - enables always-on supervision in battery-backed or ultra-low-power embedded systems |
| Operating Voltage Range | 1.0V to 5.5V - guarantees valid RESET logic state even during deep brownout, supporting robust power-fail recovery |
| Output Type | Active-low push-pull - eliminates need for external pullup resistor and simplifies interface to standard CMOS reset inputs |
| Temperature Range | –40°C to +85°C - fully specified for industrial and extended commercial environments without derating |
Pinout & Package
Package: 5-pin SOT23 (U5+1), 2.9mm × 1.6mm footprint, lead(Pb)-free, RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Primary return path for internal comparators and output driver; must be low-impedance connection to system ground plane |
| 2 VCC | Supply voltage input | Powers internal circuitry and serves as monitored supply; accepts 1.0V–5.5V; RESET remains valid down to 1.0V |
| 3 MR1 | Manual reset input 1 | Active-low input with internal 50kΩ pullup to VCC; must be held low simultaneously with MR2 for ≥6.72s to assert RESET |
| 4 MR2 | Manual reset input 2 | Active-low input with internal 50kΩ pullup to VCC; dual-input requirement enforces intentional reset initiation |
| 5 RESET | Active-low reset output | Push-pull driver; sinks ≥100µA at VCC ≥1.2V; asserts low for 140ms min after valid MR1+MR2 event or VCC drop |
Key Features
| Feature | Design Value |
|---|---|
| Dual extended-setup manual reset inputs | MR1 and MR2 both require ≥6.72s low assertion - eliminates accidental resets from momentary button presses in consumer UIs |
| Precision fixed VCC threshold | 2.313V ±0.075V with 60ppm/°C tempco - enables reliable brownout detection without external resistors or calibration |
| Guaranteed RESET validity down to VCC = 1.0V | Ensures deterministic reset behavior during deep undervoltage conditions, critical for data integrity in power-loss scenarios |
| Ultra-low quiescent current | 6µA typical at 3.6V - supports multi-year operation in battery-supervised systems such as remote controls or IoT edge nodes |
| Push-pull RESET output | Eliminates external pullup resistor, reduces BOM count, and ensures fast rise/fall times without RC delays |
Applications
| Set-Top Box Power Management | Cable Modem System Reset |
|---|---|
|
Use Scenario: Front-panel power button triggers system reset only after deliberate long press to avoid accidental reboots during normal operation. IC Role / Device Role / Timing Role: MAX6445UK23L+ acts as dual-input supervised reset controller, asserting RESET only when both MR1 and MR2 are held low for ≥6.72s. Use Value: Prevents nuisance resets from brief button contact while enabling intentional hard reset - improves user experience and field reliability. |
Use Scenario: System detects brownout on main 3.3V rail and initiates controlled reboot before memory corruption occurs. IC Role / Device Role / Timing Role: MAX6445UK23L+ monitors VCC at 2.313V and holds RESET low for 210ms after voltage recovers, ensuring stable µP restart. Use Value: Eliminates need for external voltage divider or trimming components - reduces design complexity and cost in high-volume modems. |
| DVD Player Front-Panel Control | Industrial HMI Panel Supervision |
|
Use Scenario: Channel-up/down buttons double as service reset inputs; technician presses both simultaneously for 6.72s to enter diagnostic mode. IC Role / Device Role / Timing Role: MAX6445UK23L+ provides hardware-enforced reset initiation via dual MR inputs, decoupling UI function from reset logic. Use Value: Enables shared mechanical switches for normal operation and maintenance - lowers bill-of-materials and panel assembly cost. |
Use Scenario: Embedded controller in factory automation panel must survive voltage sags on 24V-to-3.3V DC/DC output without erratic behavior. IC Role / Device Role / Timing Role: MAX6445UK23L+ supervises the 3.3V rail with 2.313V threshold and immune-to-glitch timing, asserting RESET only on sustained undervoltage. Use Value: Immunity to ≤20µs transients at 100mV overdrive ensures no spurious resets during motor switching noise - increases system uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6446UK23L+ | Same pinout and electrical specs, but open-drain RESET output instead of push-pull | Requires external pullup resistor; suited for level-shifting or wired-OR reset bus configurations | Select MAX6446UK23L+ only if system requires open-drain drive or shared reset line with other devices |
| TPS3808G33DBVR | Single manual reset input, 3.08V threshold, 200ms timeout, 2.5µA ICC - lower current but no dual-MR support | Lacks dual extended-setup capability; suitable for simpler reset schemes where only one button is available | Choose TPS3808G33DBVR for cost-sensitive, single-button designs where 6.72s dual-press enforcement is unnecessary |
Compared with MAX6445UK23L+, MAX6446UK23L+ offers identical supervision and timing but requires external pullup due to open-drain output, while TPS3808G33DBVR reduces current consumption by 60% but removes dual manual reset functionality - trade-offs directly impact UI robustness and BOM count.
Availability
MAX6445UK23L+ is available at Aetrix Electronics and suitable for set-top boxes, cable modems, and industrial HMI panels requiring stable component supply, long-term manufacturability, and guaranteed extended temperature performance.
Supply support for MAX6445UK23L+ 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 management, sensing, and interface applications, with emphasis on high-reliability industrial and communications systems.
The MAX6443–MAX6452 family was engineered specifically for robust microprocessor supervision in consumer and industrial equipment where immunity to switch bounce, brownout, and transient noise is critical - delivering factory-trimmed thresholds and extended manual reset timing in miniature packages.
FAQ
What is the exact reset threshold voltage for MAX6445UK23L+?
The MAX6445UK23L+ has a factory-set VCC reset threshold of 2.313V, with a tolerance of ±0.075V (min 2.25V, max 2.38V) over –40°C to +85°C. This value is laser-trimmed during production and documented in the Electrical Characteristics table under "VCC Reset Threshold" with suffix "23". The threshold remains stable with 60ppm/°C tempco.
How does the dual manual reset function work on MAX6445UK23L+?
MAX6445UK23L+ requires both MR1 and MR2 inputs to be held low simultaneously for ≥6.72s (the "L" suffix) before asserting RESET. Neither input alone triggers reset - this dual-input enforcement prevents accidental activation. Internal 50kΩ pullups eliminate external resistors, and the RESET pulse lasts 140ms minimum after valid assertion.
Is MAX6445UK23L+ compatible with 1.8V microcontrollers?
Yes, MAX6445UK23L+ is fully compatible with 1.8V µCs: its RESET output is push-pull active-low and guarantees VOH ≥0.8×VCC when VCC ≥1.8V and ISOURCE = 200µA. Additionally, it operates down to VCC = 1.0V, ensuring valid reset signaling even during brownout conditions affecting 1.8V rails.
What package type and footprint does MAX6445UK23L+ use?
MAX6445UK23L+ uses a 5-pin SOT23 package (package code U5+1, outline 21-0057), measuring 2.9mm × 1.6mm with 0.95mm height. It is lead(Pb)-free and RoHS compliant. The pinout is GND (1), VCC (2), MR1 (3), MR2 (4), RESET (5), matching standard SOT23-5 land patterns (land pattern no. 90-0174).
Does MAX6445UK23L+ support adjustable voltage monitoring?
No, MAX6445UK23L+ does not support adjustable voltage monitoring. It is a fixed-threshold device monitoring only VCC at 2.313V. Adjustable monitoring (via RSTIN pin) is available only on MAX6449–MAX6452 variants - MAX6445UK23L+ lacks the RSTIN pin and internal adjustable comparator circuitry.
MAX6445UK23L+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.32V
- 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
MAX6445UK23L+ FAQ
1.How can I place an order for MAX6445UK23L+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6445UK23L+ 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 MAX6445UK23L+ reliable?
The price and inventory of MAX6445UK23L+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6445UK23L+ is usually 5 days.
3.What payment methods are accepted for MAX6445UK23L+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6445UK23L+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6445UK23L+?
MAX6445UK23L+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6445UK23L+ 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 MAX6445UK23L+?
For technical support, including MAX6445UK23L+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6445UK23L+ requirements.
6.How does Aetrix verify that MAX6445UK23L+ is sourced from the original manufacturer or authorized distributors?
All MAX6445UK23L+ 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 MAX6445UK23L+ meets industry standards.
7.What is the process for return or replacement of MAX6445UK23L+?
All MAX6445UK23L+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6445UK23L+, 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 MAX6445UK23L+ part is unused and in its original packaging.
Return procedure for MAX6445UK23L+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6445UK23L+ 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…
