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Analog Devices Inc./Maxim Integrated MAX6306UK44D3
- Part No.:
- MAX6306UK44D3
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6306UK44D3.pdf
- Description:
- IC SUPERVISOR PROGRAMMABLE RESET
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
The MAX6306UK44D3 from Maxim Integrated is a precision 5-pin SOT23 programmable reset IC designed to monitor VCC supply voltage and assert an active-low push/pull RESET signal when VCC falls below 4.38V (±2.5% over temperature), with a factory-programmed 140ms minimum reset timeout period. It features manual-reset input (MR), guaranteed RESET validity down to VCC = 1V, and immunity to fast transients - ideal for reliable power-on reset in dual-voltage embedded systems.
For engineers reviewing the MAX6306UK44D3 datasheet, MAX6306UK44D3 pinout, MAX6306UK44D3 application, or MAX6306UK44D3 equivalent, key selection criteria include its 4.38V reset threshold tolerance, 140ms timeout, MR input compatibility with TTL/CMOS logic, low 8µA supply current, and SOT23-5 footprint suitability for space-constrained portable designs.
Technical Context
The MAX6306UK44D3 uses an internal factory-trimmed resistor divider to monitor VCC and compare it against a precision 1.23V reference, enabling accurate 4.38V threshold detection across -40°C to +85°C. Its reset generator incorporates a temperature-stable RC timer for the 140ms (min) timeout, and the MR input includes a 63.5kΩ internal pull-up and 1.5µs minimum pulse width requirement.
This device operates within VCC = (VTH + 2.5%) to +5.5V (i.e., 4.50V–5.5V), asserts RESET low during brownout or manual trigger, and guarantees VOL ≤ 0.3V at ISINK = 1.2mA - ensuring robust interfacing with 3.3V/5V microcontrollers without external pull-downs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 4.38V ±2.5% over -40°C to +85°C - ensures reliable brownout detection in 5V systems with margin for supply drift |
| Reset Timeout Period | 140ms (min) - meets typical µP power-up stabilization requirements without external timing components |
| Supply Current | 8µA (typ) at VCC = 5.5V - enables multi-year battery life in portable/battery-powered equipment |
| RESET Output Type | Active-low push/pull - drives loads directly without external pull-up; VOL ≤ 0.3V at 1.2mA sink current |
| Manual-Reset Input | Internal 63.5kΩ pull-up; VIH ≥ 0.7×VCC (VTH < 4.0V); 1.5µs min pulse width - supports momentary switch or logic-level reset initiation |
| Operating Voltage Range | VCC = 4.50V to 5.5V - defined by VTH + 2.5% lower bound, preventing false resets during nominal 5V operation |
| Transient Immunity | Immune to VCC transients < 140µs at 4.38V–4.25V overdrive - suppresses noise-induced false resets in electrically noisy environments |
Pinout & Package
MAX6306UK44D3 is housed in a RoHS-compliant 5-pin SOT23 package (outline U5+1, land pattern 90-0174), measuring 2.9mm × 1.6mm × 1.1mm, suitable for high-density PCB layouts and reflow soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push/pull reset output | Drives µP reset pin directly; sinks 1.2mA while holding RESET ≤ 0.3V; no external pull-up required |
| 2 - GND | System ground reference | Return path for all internal comparators and output stage; must be low-impedance connection to system ground plane |
| 3 - RST IN | Adjustable undervoltage reset input | Comparator input referenced to 1.23V; used with external resistor divider to monitor secondary supply (e.g., 3.3V rail) |
| 4 - MR | Manual-reset input | Active-low trigger; internally pulled up to VCC; debounced via 1.5µs glitch rejection; connects to momentary switch or logic signal |
| 5 - VCC | Main supply input and monitored rail | Power source and primary voltage under supervision; device monitors this pin via internal trimmed divider for 4.38V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Precision factory-set VCC threshold | 4.38V with ±2.5% tolerance over full industrial temperature range (-40°C to +85°C), eliminating calibration effort |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset assertion during deep brownout - critical for fail-safe shutdown in safety-critical embedded control |
| No external timing components | 140ms (min) reset timeout generated internally via stable RC circuit - reduces BOM count and layout area |
| Immunity to short VCC transients | Rejects glitches < 140µs duration at 4.38V–4.25V overdrive - prevents spurious resets in motor-drive or switching-power-supply environments |
| Manual-reset input with internal pull-up | 63.5kΩ internal pull-up enables direct switch connection; eliminates need for external resistor and simplifies board design |
Applications
| Industrial PLC Power Monitoring | Medical Portable Diagnostic Device |
|---|---|
Use Scenario: Monitors 5V main supply and 3.3V logic rail in a battery-backed programmable logic controller during AC loss and recovery. IC Role / Device Role / Timing Role: Primary VCC supervisor with secondary RST IN monitoring; provides 140ms reset hold to ensure FPGA configuration stability after power restoration. Use Value: Prevents corrupted state machine execution during brownout recovery by guaranteeing µP reset remains asserted until both rails stabilize above 4.38V and 3.3V thresholds. |
Use Scenario: Ensures safe power-up sequencing and fault-triggered reset in handheld ultrasound probe with dual Li-ion cells and isolated 5V/3.3V DC-DC converters. IC Role / Device Role / Timing Role: Central reset coordinator - supervises main 5V rail (VCC), auxiliary 3.3V rail (RST IN), and accepts clinician-initiated reset via MR button. Use Value: 8µA quiescent current extends battery runtime; MR input with internal pull-up enables single-pole switch interface without additional passives. |
| Automotive Body Control Module (BCM) | Network Edge Router Power Management |
Use Scenario: Supervises 5V microcontroller supply in non-safety-critical BCM subsystem exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: VCC monitor with transient-immune reset generation; MR pin tied to diagnostic port for service-mode reset. Use Value: Immunity to sub-140µs negative VCC spikes avoids false resets during alternator load dump, improving system uptime and diagnostics reliability. |
Use Scenario: Provides controlled reset for dual-core ARM SoC during 5V supply instability caused by PoE injector fluctuations or hot-swap events. IC Role / Device Role / Timing Role: Primary reset generator with 140ms timeout aligned to SoC boot ROM initialization window; RST IN monitors auxiliary 3.3V PHY supply. Use Value: Push/pull RESET output drives SoC reset pin directly - eliminates timing uncertainty from external pull-up RC networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar reset supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6306UK44D2 | Same 4.38V threshold but 20ms (min) reset timeout - faster release, less margin for slow-rising supplies | Suitable for compact µC systems with rapid power-up (e.g., wearables), not for FPGAs or complex SoCs requiring longer stabilization | Select only if system boot time < 20ms and VCC rise time is monotonic and fast; verify with oscilloscope during worst-case cold-start. |
| TPS3808G33DBVR | 3.3V fixed threshold, 200ms timeout, 1.6µA ICC - lower current but incompatible threshold and no MR input | Applicable only in 3.3V-only systems without manual reset; requires external MR circuitry if needed | Choose for ultra-low-power 3.3V applications where 4.38V monitoring is unnecessary and MR is handled elsewhere in system design. |
Compared with MAX6306UK44D2 and TPS3808G33DBVR, the MAX6306UK44D3 uniquely balances 4.38V precision supervision, 140ms industrial-grade timeout, integrated MR functionality, and push/pull drive - making it optimal for dual-rail 5V/3.3V embedded controllers requiring field-serviceable reset capability.
Availability
MAX6306UK44D3 is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, automotive body control modules, and network edge routers requiring stable component supply with guaranteed long-term manufacturability.
Supply support for MAX6306UK44D3 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, computing, and communications markets.
The MAX6305–MAX6313 family was engineered to deliver precision, low-power, multi-rail reset supervision in space-constrained embedded systems - addressing demand for factory-programmable thresholds and integrated manual reset in SOT23 packages.
FAQ
What is the exact reset threshold voltage of the MAX6306UK44D3 and how does it vary with temperature?
The MAX6306UK44D3 has a factory-programmed nominal VCC reset threshold of 4.38V, specified with ±2.5% tolerance over the full operating temperature range of -40°C to +85°C. Its temperature coefficient is 40ppm/°C, meaning threshold drift is ≤ ±0.0175V across the range - verified in the Electrical Characteristics table under "Reset Threshold" conditions for MAX6306E variants. This ensures consistent brownout detection in thermally variable environments without recalibration.
Does the MAX6306UK44D3 require external components to function as a basic VCC supervisor?
No, the MAX6306UK44D3 requires no external components for core VCC supervision: its 4.38V threshold and 140ms reset timeout are factory-programmed and internally generated. Only optional functions - such as monitoring a second supply via RST IN or adding noise filtering - need external resistors or capacitors. The MR input includes a 63.5kΩ internal pull-up, enabling direct switch connection without added passives.
Can the MAX6306UK44D3 monitor both 5V and 3.3V supplies simultaneously?
Yes, the MAX6306UK44D3 monitors VCC (5V rail) via its internal trimmed divider and simultaneously monitors a second supply (e.g., 3.3V) using the RST IN pin. By connecting a resistor divider between the 3.3V rail and GND, with RST IN tied to the divider midpoint, the device triggers reset when that rail falls below its programmed 1.23V comparator threshold - enabling true dual-rail supervision in a single SOT23-5 device.
What is the minimum VCC voltage at which the MAX6306UK44D3 guarantees valid RESET output?
The MAX6306UK44D3 guarantees RESET remains a valid logic-low output down to VCC = 1V, as explicitly stated in the Features list and confirmed in the Electrical Characteristics table (VOL tested at VCC > 1.0V, ISINK = 50µA). Below 1V, push/pull drive strength degrades; however, for most µPs that cease operation below 1V, this specification ensures deterministic reset assertion throughout the functional supply range.
How does the manual-reset (MR) input behave when pulled low on the MAX6306UK44D3?
When the MR pin on the MAX6306UK44D3 is pulled low, RESET immediately asserts (goes low) and remains asserted for the full 140ms (min) timeout period after MR returns high. The input has a 1.5µs minimum pulse width requirement and built-in 0.1µs glitch rejection. Its internal 63.5kΩ pull-up allows direct connection to a normally-open momentary switch to GND - no external resistor or debounce circuitry is needed for standard use cases.
MAX6306UK44D3 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:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 4.38V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6306UK44D3 FAQ
1.How can I place an order for MAX6306UK44D3 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6306UK44D3 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 MAX6306UK44D3 reliable?
The price and inventory of MAX6306UK44D3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6306UK44D3 is usually 5 days.
3.What payment methods are accepted for MAX6306UK44D3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6306UK44D3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6306UK44D3?
MAX6306UK44D3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6306UK44D3 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 MAX6306UK44D3?
For technical support, including MAX6306UK44D3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6306UK44D3 requirements.
6.How does Aetrix verify that MAX6306UK44D3 is sourced from the original manufacturer or authorized distributors?
All MAX6306UK44D3 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 MAX6306UK44D3 meets industry standards.
7.What is the process for return or replacement of MAX6306UK44D3?
All MAX6306UK44D3 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6306UK44D3, 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 MAX6306UK44D3 part is unused and in its original packaging.
Return procedure for MAX6306UK44D3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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