My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6321HPUK46CY+T
- Part No.:
- MAX6321HPUK46CY+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6321HPUK46CY+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:923
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6321HPUK46CY+T from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low open-drain reset output, 4.63V factory-trimmed reset threshold, 140ms minimum reset timeout, and 1.6s typical watchdog timeout. It monitors VCC supply integrity and provides system-level reset assertion during power-up, brownout, or software hang conditions in embedded controllers and portable instrumentation.
For engineers reviewing the MAX6321HPUK46CY+T datasheet, MAX6321HPUK46CY+T pinout, MAX6321HPUK46CY+T application, or MAX6321HPUK46CY+T equivalent, key selection criteria include its AEC-Q100 qualification, guaranteed reset validity down to VCC = 1V, immunity to short negative VCC transients (<4µs at 100mV under threshold), and compatibility with multi-supply reset bus architectures via external pullup.
Technical Context
The MAX6321HPUK46CY+T implements a precision voltage monitor with factory-laser-trimmed resistor divider setting VRST = 4.63V (±2.5% over -40°C to +125°C), integrated watchdog timer cleared by WDI edge transitions, and manual reset input with internal 52kΩ pullup. It asserts reset when VCC falls below VRST, MR is pulled low, or WDI remains static beyond 1.6s.
Its open-drain RESET output sinks up to 3.2mA at VCC ≥ 4.5V (VOL ≤ 0.4V) and supports pullup to any supply ≤6V. The device features no external components required, operates from 1.0V to 5.5V, and guarantees functional reset behavior down to VCC = 1V - critical for low-voltage brownout detection in battery-powered systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±2.5% over -40°C to +125°C - ensures reliable brownout detection at nominal 4.63V supply level |
| Reset Timeout Period | 140ms minimum - holds reset asserted long enough for microcontroller power stabilization and clock lock |
| Watchdog Timeout | 1.6s typical - detects software hangs without excessive system interruption latency |
| Supply Voltage Range | 1.0V to 5.5V - enables operation across wide battery discharge profiles and mixed-voltage systems |
| RESET Output Type | Active-low open-drain - allows wired-OR reset bus with multiple sources and flexible pullup voltage selection |
| Quiescent Current | 3–12µA at VCC = 3.6V - minimizes battery drain in always-on portable equipment |
| AEC-Q100 Grade | Qualified - meets automotive reliability requirements for under-hood and infotainment applications |
Pinout & Package
Package: 5-pin SOT23 (U5+2A), 1.6mm × 2.9mm footprint, RoHS-compliant lead-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain output - requires external pullup; sinks current only; compatible with 3.3V/5V logic buses |
| 2 | GND | Ground reference - common return path for all internal circuits and external decoupling |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (52kΩ); debounced by 100ns glitch rejection |
| 4 | WDI | Watchdog input - edge-sensitive; clears internal timer on rising/falling edges; disabled if left floating |
| 5 | VCC | Supply voltage input - monitored for reset generation; absolute max rating = +6V |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrated voltage reference, timing capacitors, and pullup resistors eliminate BOM count and layout area |
| Guaranteed reset validity to VCC = 1V | Ensures deterministic reset assertion even during deep brownout - prevents undefined MCU state |
| Immunity to short negative VCC transients | Withstands <4µs, 100mV-under-threshold glitches - avoids spurious resets in noisy power environments |
| Flexible reset bus architecture | Open-drain output supports multi-source reset arbitration and mixed-voltage pullup (up to 6V) |
| AEC-Q100 qualification | Validated for automotive temperature range (-40°C to +125°C) and reliability stress testing |
Applications
| Industrial PLC Controller | Automotive Infotainment Head Unit |
|---|---|
Use Scenario: Monitors 5V main supply in programmable logic controller with dual-core ARM processor and CAN interface. IC Role / Device Role / Timing Role: Primary VCC supervisor generating system-wide reset signal; WDI fed by watchdog timer peripheral. Use Value: Prevents firmware corruption during 12V battery dip events; 140ms timeout ensures stable clock lock before boot execution. | Use Scenario: Supervises 3.3V core rail in automotive head unit with display, audio codec, and Bluetooth SoC. IC Role / Device Role / Timing Role: AEC-Q100-qualified reset generator interfacing with multi-voltage reset bus (3.3V pullup). Use Value: Guarantees safe restart after cold crank (VCC drop to 2.8V); open-drain output avoids voltage conflict with other reset sources. |
| Portable Medical Monitor | Battery-Powered IoT Sensor Node |
Use Scenario: Powers ECG front-end and BLE radio in handheld patient monitor using single Li-ion cell (2.7–4.2V range). IC Role / Device Role / Timing Role: Low-quiescent-current (≤12µA) supervisor detecting brownout at 4.63V threshold during charger disconnect. Use Value: Extends runtime by minimizing standby current; 4.63V threshold avoids false triggers during normal battery sag. | Use Scenario: Manages power sequencing and fault recovery in LoRaWAN sensor node with STM32L4 MCU and environmental sensors. IC Role / Device Role / Timing Role: Dual-function supervisor: MR driven by pushbutton for field service reset; WDI toggled by firmware loop. Use Value: Enables user-initiated recovery without power cycle; 1.6s watchdog timeout catches stuck sensor read routines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6321HPUK46CT+T | Same electrical specs and pinout; differs only in tape-and-reel packaging (standard vs. custom reel size) | No functional difference; identical performance and qualification | Select for standard distribution channel availability and smaller order increments |
| TPS3808G33DBVR | 3.3V fixed reset threshold (not adjustable); 200ms min timeout; no watchdog; SOT23-5 package | Lacks watchdog and manual reset; suitable only for basic power-monitoring without software hang detection | Choose only if 4.63V threshold and watchdog functionality are not required |
Compared with MAX6321HPUK46CY+T, MAX6321HPUK46CT+T offers identical supervision capability with standard packaging logistics, while TPS3808G33DBVR provides a lower-cost alternative lacking watchdog and manual reset - making it unsuitable for safety-critical or field-serviceable designs requiring those features.
Availability
MAX6321HPUK46CY+T is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive infotainment systems, portable medical monitors, and battery-powered IoT sensor nodes requiring stable component supply with AEC-Q100 qualification and long-term lifecycle support.
Supply support for MAX6321HPUK46CY+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 high-performance analog and mixed-signal ICs for power, sensing, and interface applications in industrial, automotive, and communications markets.
The MAX6316–MAX6322 family delivers compact, low-power microprocessor supervisory solutions targeting embedded control systems where reliable power monitoring, watchdog protection, and manual reset capability are essential.
FAQ
What is the exact reset threshold voltage of MAX6321HPUK46CY+T and how tightly is it specified?
The MAX6321HPUK46CY+T has a factory-trimmed nominal reset threshold of 4.63V, specified as ±1.5% at +25°C and ±2.5% over the full operating temperature range of -40°C to +125°C. This tolerance ensures robust brownout detection without false triggering during normal supply ripple or temperature drift, and is laser-trimmed during manufacturing for consistency across production lots.
Does MAX6321HPUK46CY+T require an external pullup resistor on the RESET pin, and what value is recommended?
Yes, MAX6321HPUK46CY+T requires an external pullup resistor on the RESET pin because it features an open-drain output. A 10kΩ resistor pulled to the target logic rail (e.g., 3.3V or 5V) is sufficient in most applications - it ensures valid logic-high levels while limiting sink current to ≤0.33mA at 3.3V or ≤0.5mA at 5V, well within the device's 3.2mA sink capability at VCC ≥ 4.5V.
Can MAX6321HPUK46CY+T operate reliably when VCC drops below 2.0V, and what is the minimum functional supply voltage?
Yes, MAX6321HPUK46CY+T is guaranteed to assert a valid reset signal down to VCC = 1.0V, as confirmed in its Absolute Maximum Ratings and Electrical Characteristics tables. This allows it to detect deep brownout conditions in Li-ion battery systems where voltage may sag to 2.5V or lower during peak load, ensuring the microcontroller enters reset before entering undefined operational states.
How does the watchdog function behave if the WDI pin is left unconnected on MAX6321HPUK46CY+T?
When WDI is left unconnected on MAX6321HPUK46CY+T, the internal watchdog timer is automatically serviced at intervals equal to 7/8 of the nominal watchdog timeout period (i.e., ~1.4s for the 1.6s version), preventing unintended reset assertion. This allows the watchdog feature to be safely disabled without adding external circuitry, while maintaining full reset supervision functionality for power-related faults.
Is MAX6321HPUK46CY+T pin-compatible with other devices in the MAX6316–MAX6322 family, and which variants share the same pinout?
Yes, MAX6321HPUK46CY+T shares the identical 5-pin SOT23 pinout with all members of the MAX6316–MAX6322 family, including MAX6320P and MAX6322HP. Pin 1 is RESET (open-drain), Pin 2 is GND, Pin 3 is MR, Pin 4 is WDI, and Pin 5 is VCC - enabling direct substitution within the same reset-output configuration group, provided threshold, timeout, and feature requirements align.
MAX6321HPUK46CY+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:
- 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+T FAQ
1.How can I place an order for MAX6321HPUK46CY+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6321HPUK46CY+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 MAX6321HPUK46CY+T reliable?
The price and inventory of MAX6321HPUK46CY+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6321HPUK46CY+T is usually 5 days.
3.What payment methods are accepted for MAX6321HPUK46CY+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6321HPUK46CY+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6321HPUK46CY+T?
MAX6321HPUK46CY+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6321HPUK46CY+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 MAX6321HPUK46CY+T?
For technical support, including MAX6321HPUK46CY+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6321HPUK46CY+T requirements.
6.How does Aetrix verify that MAX6321HPUK46CY+T is sourced from the original manufacturer or authorized distributors?
All MAX6321HPUK46CY+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 MAX6321HPUK46CY+T meets industry standards.
7.What is the process for return or replacement of MAX6321HPUK46CY+T?
All MAX6321HPUK46CY+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6321HPUK46CY+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 MAX6321HPUK46CY+T part is unused and in its original packaging.
Return procedure for MAX6321HPUK46CY+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6321HPUK46CY+T 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…
