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Analog Devices Inc./Maxim Integrated MAX6319LHUK44C-T
- Part No.:
- MAX6319LHUK44C-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6319LHUK44C-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,265
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Product details
Overview
MAX6319LHUK44C-T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low push/pull reset output, manual reset input, and factory-trimmed 4.4V reset threshold (±2.5% over -40°C to +125°C), 140ms minimum reset timeout, and no watchdog function. It monitors VCC in embedded control systems and ensures reliable power-on reset during brownout conditions.
For engineers reviewing the MAX6319LHUK44C-T datasheet, MAX6319LHUK44C-T pinout, MAX6319LHUK44C-T application, or MAX6319LHUK44C-T equivalent, key selection criteria include reset threshold accuracy, guaranteed reset validity down to VCC = 1V, manual reset pulse width tolerance (1.5µs min at full temperature range), bidirectional compatibility absence, and SOT23-5 footprint constraints.
Technical Context
The MAX6319LHUK44C-T implements a precision voltage monitor using a factory-laser-trimmed resistor divider to set its 4.4V nominal reset threshold, with ±2.5% tolerance across -40°C to +125°C and 40ppm/°C temperature coefficient. Its reset generator asserts an active-low push/pull output for ≥140ms after VCC rises above threshold or MR release.
It features a dedicated manual reset (MR) input with internal 52kΩ pullup, 0.3×VCC/0.7×VCC logic thresholds (for VTH < 4.0V), 100ns glitch rejection, and 230ns MR-to-reset propagation delay at VCC = 5V. No watchdog input (WDI) is present - confirmed by Selector Guide and ordering suffix "LH" (L = no WDI, H = active-high RESET not applicable here; per data sheet, MAX6319LH has active-low push/pull RESET).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.4V nominal (factory-trimmed), ±2.5% over -40°C to +125°C - ensures accurate brownout detection for 4.5V nominal supplies |
| Reset Timeout Period | 140ms minimum - guarantees sufficient hold time for microprocessor initialization sequences |
| Supply Current | 3–8µA at VCC = 3.6V - enables ultra-low-power operation in battery-backed systems |
| Operating Voltage Range | 1.0V to 5.5V - supports valid reset assertion even during deep brownout down to 1V VCC |
| Reset Output Type | Active-low, push/pull CMOS - drives reset line directly without external pullup; sinks/source current up to 3.2mA |
| MR Input Threshold | VIL = 0.3×VCC, VIH = 0.7×VCC (VTH < 4.0V) - compatible with 3V CMOS logic levels |
| Package | SOT23-5 (U5+2A code) - 2.9mm × 1.6mm footprint, suitable for space-constrained PCB layouts |
Pinout & Package
SOT23-5 package (outline 21-0057, land pattern 90-0174), RoHS-compliant, thermal resistance θJA = 255.9°C/W (multi-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active-low) | CMOS push/pull output; asserts low during power-up/brownout/MR activation; drives µP reset pin directly |
| 2 | GND | Ground reference for all internal comparators and output stage; must be low-impedance connection |
| 3 | MR (manual reset) | Active-low input; internal 52kΩ pullup to VCC; requires ≥1.5µs pulse width at full temp range to trigger reset |
| 4 | NC | No connect - pin 4 is unused and must remain floating or grounded per layout guidelines |
| 5 | VCC | Power supply input; monitored for reset threshold violation; absolute max = +6V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.4V reset threshold | Eliminates external resistor network; achieves ±2.5% accuracy over full industrial temperature range |
| 140ms minimum reset timeout | Meets µP power-on reset timing requirements for ARM Cortex-M and similar MCUs without external RC timing |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset behavior during severe undervoltage events, critical for fail-safe embedded systems |
| MR input with 100ns glitch rejection | Rejects EMI-induced noise on manual reset line, preventing spurious resets in electrically noisy environments |
| SOT23-5 package with AEC-Q100 qualification | Enables use in automotive body electronics and industrial controllers requiring high reliability and small form factor |
Applications
| Industrial PLC I/O Modules | Medical Infusion Pumps |
|---|---|
Use Scenario: Power monitoring in DIN-rail mounted programmable logic controller modules operating from 24VDC converted to 5V/3.3V rails. IC Role / Device Role / Timing Role: Supervises 3.3V microcontroller supply; asserts reset if input converter drops below 4.4V due to load transients or aging. Use Value: Prevents firmware corruption during brownout by holding MCU in reset until stable 3.3V is restored for ≥140ms. | Use Scenario: Battery-powered portable infusion pump with ARM-based controller requiring fail-safe power sequencing. IC Role / Device Role / Timing Role: Monitors main Li-ion battery-derived 3.3V rail; triggers reset before voltage falls below MCU operational minimum. Use Value: Guarantees safe shutdown and state preservation when battery reaches end-of-discharge at ~3.4V, leveraging 4.4V threshold margin. |
| Automotive Body Control Units | Smart Energy Meters |
Use Scenario: 12V automotive system with buck regulator supplying 3.3V to body control MCU; subject to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Detects VCC dip below 4.4V during cranking; holds reset asserted until supply stabilizes post-cranking. Use Value: Maintains MCU reset during 500ms cold-crank event, avoiding erratic behavior or EEPROM corruption. | Use Scenario: Revenue-grade electricity meter with isolated power supply and metrology SoC requiring deterministic boot integrity. IC Role / Device Role / Timing Role: Supervises 3.3V metrology domain supply; provides clean reset pulse synchronized to AC zero-crossing startup. Use Value: Ensures metrology firmware starts only after stable 3.3V is confirmed for ≥140ms, meeting IEC 62053-21 timing compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6319MHUK44C-T | Bidirectional active-low reset output (not push/pull); includes internal 4.7kΩ pullup + active P-channel FET | Required for Motorola 68HC11 or other µPs with bidirectional reset pins; incompatible with standard push/pull-only reset inputs | Select MAX6319MHUK44C-T only when interfacing with bidirectional-reset µPs; otherwise MAX6319LHUK44C-T is preferred for simplicity and lower cost |
| TPS3808G33DBVR | 3.3V fixed reset threshold (not 4.4V); 200ms reset timeout; includes watchdog timer; SOT23-6 package | Designed for 3.3V systems; adds watchdog functionality absent in MAX6319LHUK44C-T; requires sixth pin for WDI | Choose TPS3808G33DBVR only for 3.3V-supply systems needing watchdog; MAX6319LHUK44C-T remains optimal for 4.4V threshold and pin-count-constrained designs |
Compared with MAX6319MHUK44C-T, the MAX6319LHUK44C-T offers simpler push/pull drive without bidirectional complexity, reducing layout risk in standard µP interfaces; versus TPS3808G33DBVR, it provides precise 4.4V threshold and 5-pin footprint where watchdog is unnecessary and voltage margin is critical.
Availability
MAX6319LHUK44C-T is available at Aetrix Electronics and suitable for industrial PLC I/O modules, medical infusion pumps, and automotive body control units requiring stable component supply with AEC-Q100 qualification and long-term lifecycle support.
Supply support for MAX6319LHUK44C-T 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 industrial, automotive, and computing applications, emphasizing reliability, low power, and integration.
The MAX6316–MAX6322 family delivers highly configurable µP supervisory circuits targeting space-constrained, mission-critical embedded systems where deterministic power-on reset and brownout protection are essential.
FAQ
What is the exact reset threshold voltage of MAX6319LHUK44C-T and how does it vary with temperature?
The MAX6319LHUK44C-T has a factory-trimmed nominal reset threshold of 4.4V, with ±2.5% tolerance over -40°C to +125°C and a temperature coefficient of 40ppm/°C. At +25°C, VRST is guaranteed between 4.29V and 4.51V; at extremes, it remains within 4.29V to 4.51V, ensuring consistent brownout detection across automotive and industrial environments.
Does MAX6319LHUK44C-T include a watchdog timer function?
No, MAX6319LHUK44C-T does not include a watchdog timer. The "LH" in its part number denotes no watchdog input (WDI) and active-low push/pull reset output. This is confirmed by the Selector Guide and Electrical Characteristics tables, which omit WDI-related parameters for this variant.
What is the minimum pulse width required on the MR pin of MAX6319LHUK44C-T to guarantee reset assertion?
The MR input of MAX6319LHUK44C-T requires a minimum pulse width of 1.5µs over the full -40°C to +125°C temperature range to reliably trigger reset. At +25°C, a 1µs pulse suffices, but design must accommodate the worst-case 1.5µs specification for robust operation in industrial and automotive applications.
Can MAX6319LHUK44C-T operate with supply voltages below 2.5V?
Yes, MAX6319LHUK44C-T operates from VCC = 1.0V to 5.5V. Its reset output remains valid (guaranteed logic low/high) down to VCC = 1V, enabling use in ultra-low-voltage brownout scenarios where other supervisors fail - critical for battery-depleted conditions in portable equipment.
What is the function of Pin 4 on MAX6319LHUK44C-T, and how should it be handled in PCB layout?
Pin 4 of MAX6319LHUK44C-T is a no-connect (NC) terminal. It must be left unconnected - neither tied to GND nor VCC - to avoid unintended electrical interaction. Layout best practice is to omit copper connection entirely at this pad to prevent solder bridging or parasitic coupling in high-density designs.
MAX6319LHUK44C-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.39V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6319LHUK44C-T FAQ
1.How can I place an order for MAX6319LHUK44C-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6319LHUK44C-T 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 MAX6319LHUK44C-T reliable?
The price and inventory of MAX6319LHUK44C-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6319LHUK44C-T is usually 5 days.
3.What payment methods are accepted for MAX6319LHUK44C-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6319LHUK44C-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6319LHUK44C-T?
MAX6319LHUK44C-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6319LHUK44C-T 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 MAX6319LHUK44C-T?
For technical support, including MAX6319LHUK44C-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6319LHUK44C-T requirements.
6.How does Aetrix verify that MAX6319LHUK44C-T is sourced from the original manufacturer or authorized distributors?
All MAX6319LHUK44C-T 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 MAX6319LHUK44C-T meets industry standards.
7.What is the process for return or replacement of MAX6319LHUK44C-T?
All MAX6319LHUK44C-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6319LHUK44C-T, 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 MAX6319LHUK44C-T part is unused and in its original packaging.
Return procedure for MAX6319LHUK44C-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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