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Analog Devices Inc./Maxim Integrated MAX6319LHUK29B+
- Part No.:
- MAX6319LHUK29B+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6319LHUK29B+.pdf
- Description:
- MAX6319 5-PIN MICROPROCESSOR SUP
- Quantity:
- Payment:
- Shipping:
Inventory:1,159
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Product details
Overview
MAX6319LHUK29B+ from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, 2.93V factory-trimmed reset threshold, 140ms minimum reset timeout, and no watchdog timer. It monitors VCC supply integrity and asserts reset during power-up, brownout, or manual reset events, and is used in embedded control systems requiring guaranteed reset validity down to VCC = 1V.
For engineers reviewing the MAX6319LHUK29B+ datasheet, MAX6319LHUK29B+ pinout, MAX6319LHUK29B+ application, or MAX6319LHUK29B+ equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and validated alternative parts for industrial and battery-powered designs where reliable power-on reset and manual reset assertion are critical.
Technical Context
The MAX6319LHUK29B+ implements a precision voltage monitor with factory-laser-trimmed resistive divider setting VRST = 2.93V (±2.5% over -40°C to +125°C), and guarantees valid reset assertion down to VCC = 1V. Its internal reset generator holds RESET low for exactly 140ms after VCC rises above VRST.
This variant lacks watchdog functionality (no WDI timeout support) and features a dedicated manual reset input (MR) with 52kΩ internal pullup, 100ns glitch rejection, and compatibility with TTL/CMOS logic levels. It uses a CMOS push/pull output stage capable of sourcing/sinking ≥500µA at VCC ≥ 2.7V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.93V ±2.5% (factory-trimmed; ensures precise brownout detection at nominal 2.93V) |
| Reset Timeout Period | 140ms minimum (guaranteed deassertion delay after VCC recovery; prevents premature MCU boot) |
| Supply Voltage Range | 1.0V to 5.5V (enables operation across wide battery discharge profiles and multi-rail systems) |
| Supply Current | 3µA typical at VCC = 3.6V (ultra-low quiescent current supports long-life portable/battery applications) |
| Reset Output Type | Active-Low, Push/Pull (drives RESET directly without external pullup; sinks ≥1.2mA at VCC ≥ 2.7V) |
| Manual Reset Input | Internal 52kΩ pullup; 100ns glitch rejection; compatible with open-drain/TTL/CMOS drivers |
| Operating Temperature | -40°C to +125°C (qualified for automotive under-hood and industrial embedded environments) |
Pinout & Package
MAX6319LHUK29B+ is housed in a lead-free 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable and embedded systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Primary return path for all internal circuits; must be connected to system ground plane for stable reset timing |
| 2 - MR | Manual reset input | Active-low input; pulling MR low forces reset for full 140ms period; internally pulled up to VCC via 52kΩ resistor |
| 3 - VCC | Supply voltage input | Monitored power rail; reset asserts when VCC falls below 2.93V; device operates down to 1.0V |
| 4 - RESET | Active-low reset output | CMOS push/pull driver; actively drives low during reset and high otherwise; no external pullup required |
| 5 - NC | No connect | Unused pin; left unconnected per datasheet; not bonded internally |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed reset threshold | 2.93V with ±2.5% tolerance over full temperature range eliminates need for external resistor networks |
| Guaranteed reset validity to 1V | Ensures clean, deterministic reset assertion even during deep brownout or battery sag conditions |
| 140ms fixed reset timeout | Provides sufficient hold time for slow-ramping power supplies and complex MCU initialization sequences |
| Ultra-low supply current | 3µA typical at 3.6V enables >10-year battery life in always-on monitoring applications |
| Immunity to fast VCC transients | Rejects <4µs negative glitches down to 100mV below VRST, preventing spurious resets in noisy environments |
Applications
| Industrial PLC I/O Module | Medical Infusion Pump Controller |
|---|---|
|
Use Scenario: Power sequencing and fault recovery in DIN-rail mounted programmable logic controllers with multiple isolated DC-DC rails. IC Role / Device Role / Timing Role: Primary VCC supervisor for main 3.3V logic rail; asserts reset on undervoltage and responds to operator-initiated hardware reset. Use Value: Prevents firmware corruption during AC line sags or hot-swap events; 140ms timeout aligns with FPGA configuration time and EEPROM write cycles. |
Use Scenario: Safety-critical reset management in battery-powered infusion pumps requiring fail-safe startup and emergency shutdown. IC Role / Device Role / Timing Role: Monitors main Li-ion battery voltage (nominal 3.6V); triggers hard reset if cell drops below 2.93V or user presses emergency stop button. Use Value: Guarantees MCU enters known state before motor activation; 1V operating limit supports operation until battery reaches end-of-discharge. |
| Automotive Body Control Module | Smart Energy Meter MCU Subsystem |
|
Use Scenario: Reset coordination in 12V-to-3.3V converted subsystems exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervises post-regulator 3.3V rail; immune to <4µs VCC dips caused by relay switching or alternator noise. Use Value: Eliminates need for external RC filter on reset line; reduces BOM count and board area while meeting AEC-Q100 Grade 1 requirements. |
Use Scenario: Tamper-resistant power monitoring in utility-grade electricity meters with backup supercapacitor hold-up. IC Role / Device Role / Timing Role: Detects main supply failure and initiates secure shutdown sequence; MR pin tied to tamper switch for forced reset on enclosure breach. Use Value: Ensures meter retains last valid kWh reading and cryptographic keys during brownout; 5.5V max rating accommodates supercapacitor charge voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6316LUK29B+ | Same 2.93V threshold and 140ms timeout, but includes watchdog timer (6.3ms typ) | Required where software hang detection is needed alongside power monitoring | Select MAX6316LUK29B+ only if watchdog functionality is mandatory; otherwise MAX6319LHUK29B+ offers lower cost and simpler firmware integration |
| TPS3808G18DBVR | 2.5V threshold, 200ms timeout, 1.8V–6.0V supply range, no MR pin | Suitable for 1.8V/2.5V logic domains; lacks manual reset capability | Choose TPS3808G18DBVR for low-voltage ASIC/FPGA platforms without manual reset requirement; MAX6319LHUK29B+ preferred where MR-driven field service or safety interlock is needed |
Compared with MAX6316LUK29B+, MAX6319LHUK29B+ removes watchdog circuitry to reduce cost and complexity, making it ideal for fixed-function embedded systems. Versus TPS3808G18DBVR, it provides manual reset and tighter 2.93V threshold alignment for 3.3V systems, but requires higher minimum VCC (1.0V vs. 1.8V).
Availability
MAX6319LHUK29B+ is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical infusion pump controllers, automotive body control modules, and smart energy meter MCU subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6319LHUK29B+ 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, automotive, and computing markets.
The MAX6316–MAX6322 family was designed specifically for robust microprocessor supervision in harsh environments, delivering guaranteed reset validity down to 1V, immunity to fast transients, and factory-trimmed thresholds to eliminate calibration overhead.
FAQ
What is the reset threshold voltage of the MAX6319LHUK29B+?
The MAX6319LHUK29B+ has a factory-trimmed reset threshold of 2.93V, with guaranteed tolerance of ±2.5% over the full operating temperature range (-40°C to +125°C). This value is laser-trimmed during manufacturing and does not require external calibration. The MAX6319LHUK29B+ asserts reset when VCC falls below this threshold and holds it active for 140ms after VCC rises above it.
Does the MAX6319LHUK29B+ include a watchdog timer?
No, the MAX6319LHUK29B+ does not include a watchdog timer. Unlike variants such as MAX6316LUK29B+, this part omits the WDI (watchdog input) pin and associated timing circuitry. Its function is limited to power-supply monitoring and manual reset assertion. The absence of watchdog functionality simplifies firmware design and reduces system-level timing dependencies for applications where software hang detection is handled externally.
What is the purpose of Pin 5 (NC) on the MAX6319LHUK29B+?
Pin 5 on the MAX6319LHUK29B+ is designated NC (No Connect) and is not internally bonded. It must remain unconnected on the PCB layout. This pin exists for package compatibility within the MAX6316–MAX6322 family but serves no electrical function in the MAX6319LHUK29B+ variant. Connecting it to any net may cause unpredictable behavior or violate absolute maximum ratings.
Can the MAX6319LHUK29B+ operate reliably at VCC = 1.0V?
Yes, the MAX6319LHUK29B+ guarantees valid reset output operation down to VCC = 1.0V. Both the RESET output low voltage (VOL ≤ 0.3V at ISINK = 1.2mA) and high voltage (VOH ≥ 0.8×VCC at ISOURCE = 500µA) are specified at this minimum supply level. This ensures deterministic reset assertion during deep brownout or end-of-battery conditions, a key differentiator versus many competing supervisors rated only to 1.6V or higher.
How does the manual reset (MR) input behave on the MAX6319LHUK29B+?
The MR input on the MAX6319LHUK29B+ is an active-low signal with an internal 52kΩ pullup resistor to VCC. Pulling MR low forces a reset that remains asserted for the full 140ms timeout period, regardless of how briefly MR is held low. The input rejects transients ≤100ns and accepts TTL/CMOS logic levels. If unused, MR may be left floating - the internal pullup ensures it remains high and inactive.
MAX6319LHUK29B+ 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:
- Power Supply Monitor
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6319LHUK29B+ FAQ
1.How can I place an order for MAX6319LHUK29B+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6319LHUK29B+ 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 MAX6319LHUK29B+ reliable?
The price and inventory of MAX6319LHUK29B+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6319LHUK29B+ is usually 5 days.
3.What payment methods are accepted for MAX6319LHUK29B+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6319LHUK29B+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6319LHUK29B+?
MAX6319LHUK29B+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6319LHUK29B+ 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 MAX6319LHUK29B+?
For technical support, including MAX6319LHUK29B+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6319LHUK29B+ requirements.
6.How does Aetrix verify that MAX6319LHUK29B+ is sourced from the original manufacturer or authorized distributors?
All MAX6319LHUK29B+ 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 MAX6319LHUK29B+ meets industry standards.
7.What is the process for return or replacement of MAX6319LHUK29B+?
All MAX6319LHUK29B+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6319LHUK29B+, 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 MAX6319LHUK29B+ part is unused and in its original packaging.
Return procedure for MAX6319LHUK29B+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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