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Analog Devices Inc./Maxim Integrated MAX6321HPUK46CY
- Part No.:
- MAX6321HPUK46CY
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6321HPUK46CY.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,144
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Product details
Overview
MAX6321HPUK46CY from Maxim Integrated is an active-low, open-drain microprocessor supervisory circuit with watchdog and manual reset functions. It monitors VCC supply voltage (2.5V–5.5V), asserts reset when VCC drops below 4.63V, provides 140ms minimum power-on reset timeout, and features 1.6s typical watchdog timeout. Used in embedded control systems to ensure reliable µP startup and fault recovery.
For engineers reviewing the MAX6321HPUK46CY datasheet, MAX6321HPUK46CY pinout, MAX6321HPUK46CY application, or MAX6321HPUK46CY equivalent, key selection criteria include its 4.63V factory-trimmed reset threshold, open-drain output compatible with multi-supply systems, guaranteed reset validity down to VCC = 1V, and immunity to sub-4µs negative VCC transients.
Technical Context
The MAX6321HPUK46CY implements a precision voltage monitor with ±2.5% reset threshold tolerance over –40°C to +125°C, paired with a digitally trimmed watchdog timer that clears on any WDI edge (rising or falling) and times out after 1.6s if unserviced. Its open-drain RESET output sinks up to 3.2mA at VCC ≥ 4.5V with VOL ≤ 0.4V, enabling flexible pullup to voltages up to 6V.
It integrates a manual reset input (MR) with internal 52kΩ pullup, 100ns glitch rejection, and 1.5µs minimum pulse width requirement. The device operates across full industrial temperature range and draws only 5–12µA supply current at 3.6V, making it suitable for battery-powered applications requiring low quiescent power.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2.5% - factory-trimmed to precisely monitor 5V rail brownout conditions |
| Reset Timeout Period | 140ms minimum - ensures stable µP initialization after power-up or recovery |
| Watchdog Timeout | 1.6s typical - detects µP lockup without requiring software polling overhead |
| Supply Voltage Range | 1.0V to 5.5V - guarantees valid reset assertion even during deep brownout |
| RESET Output Type | Open-drain, active-low - allows shared reset bus with mixed-voltage devices and external pullup to any supply ≤6V |
| Supply Current | 5µA at 3.6V - enables multi-year operation in coin-cell–powered portable instruments |
| VCC Transient Immunity | Immune to <4µs negative glitches at 100mV under threshold - eliminates false resets from switching noise |
Pinout & Package
MAX6321HPUK46CY is housed in a miniature 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), RoHS-compliant, with lead-free finish (designated by "+T" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - GND | Ground reference | Return path for all internal circuits; must be connected directly to system ground plane |
| 2 - WDI | Watchdog input | Edge-triggered input; rising or falling edge resets watchdog timer; left unconnected to disable watchdog |
| 3 - MR | Manual reset input | Active-low input with internal 52kΩ pullup; logic low forces reset for full 140ms timeout period |
| 4 - RESET | Open-drain reset output | Sinks current when asserted; requires external pullup resistor (e.g., 10kΩ) to target supply (≤6V) |
| 5 - VCC | Supply voltage input | Monitored power rail; reset asserted when VCC falls below 4.63V; operates down to 1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.63V threshold | Eliminates need for external resistor divider; ensures accurate 5V rail monitoring without calibration |
| Open-drain RESET output | Enables level-shifting and shared reset buses across multiple supply domains (e.g., 3.3V µP + 5V peripheral) |
| 1.6s watchdog timeout | Matches typical firmware loop execution windows; prevents infinite hangs without tight timing constraints |
| 140ms reset timeout | Long enough to stabilize crystal oscillators and power rails, short enough to minimize boot delay |
| Guaranteed operation to VCC = 1V | Ensures clean reset deassertion during controlled power-down sequences before full rail collapse |
Applications
| Industrial PLC Controller | Portable Medical Monitor |
|---|---|
Use Scenario: Compact programmable logic controller operating in factory environments with noisy 24V DC supplies converted to 5V. IC Role / Device Role / Timing Role: Supervises 5V logic rail, triggers hardware reset on undervoltage or µP hang, and enables field-serviceable manual reset via front-panel switch. Use Value: Prevents spurious I/O state changes during brownout; open-drain output interfaces cleanly with isolated 24V reset signaling circuitry. | Use Scenario: Battery-powered vital signs monitor with low-power ARM Cortex-M0+ MCU and analog front-end. IC Role / Device Role / Timing Role: Monitors main 3.3V supply derived from Li-ion battery, asserts reset if voltage sags below 4.63V (indicating end-of-life or protection cutoff), and services watchdog to detect firmware crashes. Use Value: 5µA quiescent current extends battery life; 140ms reset timeout accommodates slow-start LDOs; MR pin accepts tactile switch without debounce components. |
| Automotive Body Control Module | Smart Energy Meter |
Use Scenario: CAN-connected BCM managing door locks, lighting, and sensors in 12V vehicle electrical system. IC Role / Device Role / Timing Role: Supervises 5V microcontroller supply generated from automotive-grade DC/DC converter; detects supply instability caused by load dump or cold-crank events. Use Value: Immunity to <4µs VCC transients rejects noise from relay switching and ignition pulses; guaranteed reset validity to 1V supports graceful shutdown during battery disconnect. | Use Scenario: DIN-rail mounted electricity meter with metrology ASIC, real-time clock, and RS-485 interface operating from 3-phase rectified supply. IC Role / Device Role / Timing Role: Ensures µP boots only after stable 3.3V rail is established post-power-up; watchdog guards against communication stack lockups during long-duration data logging. Use Value: Open-drain RESET output shares bus with RTC backup supervisor; 4.63V threshold aligns with 5V auxiliary supply used for non-volatile memory and secure element. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6320PUK46CY-T | No manual reset (MR) input; identical reset threshold, timeout, and watchdog specs | Used where system-level reset initiation is handled solely by power monitoring or external logic | Select when manual reset functionality is unnecessary and BOM simplification is prioritized |
| TPS3808G33DBVR | 3.3V fixed reset threshold; push/pull (not open-drain) output; 200ms min reset timeout | Designed for 3.3V-only systems; lacks watchdog and MR inputs; higher ICC (12µA typical) | Choose only for cost-sensitive 3.3V applications without multi-supply reset sharing or watchdog requirements |
Compared with MAX6320PUK46CY-T and TPS3808G33DBVR, MAX6321HPUK46CY uniquely combines 4.63V precision monitoring, open-drain flexibility, manual reset, and 1.6s watchdog - making it optimal for 5V embedded systems requiring robust, multi-source reset control and interoperability across voltage domains.
Availability
MAX6321HPUK46CY is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical monitors, automotive body control modules, and smart energy meters requiring stable component supply and long-term lifecycle support.
Supply support for MAX6321HPUK46CY 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 high-performance analog and mixed-signal ICs for industrial, automotive, communications, and computing markets.
The MAX6316–MAX6322 family was engineered specifically for reliable microprocessor supervision in harsh environments - delivering precise voltage monitoring, configurable reset timing, watchdog safety, and noise-immune operation in space-constrained SOT23 packages.
FAQ
What is the exact reset threshold voltage of MAX6321HPUK46CY?
The MAX6321HPUK46CY has a factory-trimmed nominal reset threshold of 4.63V, with guaranteed tolerance of ±2.5% over the full –40°C to +125°C temperature range. This value is confirmed in Table 1 and Table 2 of the official Maxim datasheet (Rev 11, 2/13), and corresponds to the "46" in the part number per the ordering guide.
Does MAX6321HPUK46CY support manual reset functionality?
Yes, MAX6321HPUK46CY includes a dedicated MR (manual reset) input pin (Pin 3). A logic-low pulse ≥1.5µs on MR forces an active-low reset for the full 140ms timeout period. The pin features an internal 52kΩ pullup resistor, allowing it to be left unconnected when unused - no external components required.
What type of reset output does MAX6321HPUK46CY provide, and how is it used?
MAX6321HPUK46CY provides an open-drain, active-low RESET output (Pin 4). It sinks current when asserted and requires an external pullup resistor to a voltage rail ≤6V. This architecture enables shared reset buses, level translation between different supply domains, and compatibility with µPs having bidirectional or open-drain reset inputs.
Can MAX6321HPUK46CY operate reliably during severe power supply transients?
Yes, MAX6321HPUK46CY is specifically designed to ignore fast negative VCC transients - it remains immune to pulses as short as 4µs when the voltage dip is ≤100mV below the 4.63V threshold. This behavior is verified in Figure 6 of the datasheet and ensures no false resets during switching noise or relay bounce.
What is the watchdog timeout period of MAX6321HPUK46CY, and how is it triggered?
The MAX6321HPUK46CY features a typical watchdog timeout period of 1.6s (corresponding to suffix "Y" per Table 3). The internal timer clears on any rising or falling edge at the WDI pin (Pin 2); if no edge occurs within 1.6s, RESET is asserted. Leaving WDI unconnected disables the watchdog function entirely.
MAX6321HPUK46CY 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:
- 4.63V
- Output:
- Open Drain, Push-Pull
- 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
MAX6321HPUK46CY FAQ
1.How can I place an order for MAX6321HPUK46CY through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6321HPUK46CY 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 MAX6321HPUK46CY reliable?
The price and inventory of MAX6321HPUK46CY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6321HPUK46CY is usually 5 days.
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Once your MAX6321HPUK46CY 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 MAX6321HPUK46CY?
For technical support, including MAX6321HPUK46CY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6321HPUK46CY requirements.
6.How does Aetrix verify that MAX6321HPUK46CY is sourced from the original manufacturer or authorized distributors?
All MAX6321HPUK46CY 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 MAX6321HPUK46CY meets industry standards.
7.What is the process for return or replacement of MAX6321HPUK46CY?
All MAX6321HPUK46CY units undergo pre-shipment inspection (PSI). If there is an issue with MAX6321HPUK46CY, 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 MAX6321HPUK46CY part is unused and in its original packaging.
Return procedure for MAX6321HPUK46CY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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