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Analog Devices Inc./Maxim Integrated MAX6328XR23+T
- Part No.:
- MAX6328XR23+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-70, SOT-323
- Datasheet:
-
MAX6328XR23+T.pdf
- Description:
- IC MPU/RESET CIRC 2.32V SC70-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,910
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Product details
Overview
MAX6328XR23+T from Maxim Integrated is an ultra-low-power, open-drain, active-low microprocessor supervisory circuit in SC70-3 package, monitoring VCC supply voltage with factory-trimmed 2.32V reset threshold (±1.5% at +25°C, ±2.5% over -40°C to +85°C), 100ms minimum reset timeout, and 1µA max supply current at 3V - used for reliable power-on/brownout reset assertion in portable µP systems.
For engineers reviewing the MAX6328XR23+T datasheet, MAX6328XR23+T pinout, MAX6328XR23+T application, or MAX6328XR23+T equivalent, key selection criteria include open-drain RESET output compatibility with bidirectional µP reset pins (e.g., Motorola 68HC11), transient immunity against negative-going VCC glitches up to 200µs at 100mV overdrive, and guaranteed correct operation down to VCC = 1.2V over full temperature range.
Technical Context
The MAX6328XR23+T implements a precision bandgap-based reset comparator with hysteresis (6.3mV) and internal timing capacitor to generate a minimum 100ms active-low reset pulse after VCC rises above 2.32V. It asserts RESET low during power-up, power-down, and brownout conditions, holding it asserted until VCC remains stable above threshold for ≥100ms.
Its open-drain RESET output requires an external pull-up resistor and supports wired-OR configurations with µP bidirectional reset pins. The device ignores fast transients on VCC (up to 100V/µs slew rate) and operates across full industrial temperature range (-40°C to +85°C) with guaranteed functionality down to 1.2V VCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.32V (±1.5% at +25°C; ±2.5% over -40°C to +85°C) - ensures reliable detection of 3V system brownout before logic corruption. |
| Supply Current | 1.0µA max at 3V - enables multi-year battery life in portable equipment without compromising reset accuracy. |
| Reset Timeout | 100ms minimum (185ms typical, 280ms max) - guarantees sufficient hold time for µP initialization and peripheral stabilization. |
| Output Type | Open-drain active-low RESET - allows direct interface to bidirectional µP reset pins using single external pull-up. |
| VCC Operating Range | 1.2V to 5.5V - supports operation during deep brownout and ensures valid reset state even under weak battery conditions. |
| Reset Hysteresis | 6.3mV - prevents oscillation near threshold during slow VCC ramp-up or noise-induced marginal crossings. |
| Transient Immunity | Rejects negative VCC glitches ≤200µs at 100mV overdrive - eliminates false resets from switching noise or ESD coupling. |
Pinout & Package
MAX6328XR23+T is housed in a 3-pin SC70-3 (X3-2) package, 1.25mm × 0.85mm footprint, 0.95mm height, RoHS-compliant lead-free construction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (GND) | Ground reference | Return path for internal comparator and output stage; must be connected directly to system ground plane. |
| 2 (RESET) | Open-drain active-low reset output | Drives low when VCC < 2.32V or during timeout; requires external pull-up (typically 10–100kΩ) to VCC or another rail. |
| 3 (VCC) | Supply input | Monitored power rail input; accepts 1.2V–5.5V; internal circuitry remains functional down to 1.2V for valid reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low 1µA supply current | Enables integration into always-on battery-backed subsystems without measurable impact on standby life. |
| Factory-trimmed 2.32V threshold | Eliminates external resistor divider calibration; meets tight tolerance requirements for 3V logic systems. |
| 100ms minimum reset timeout | Guarantees µP core and peripherals complete power-rail stabilization and internal state initialization before release. |
| Open-drain RESET with 0.3V VOL @ 1.6mA | Ensures robust low-state drive into noisy environments and compatibility with mixed-voltage I/O domains. |
| Power-supply transient immunity | Prevents spurious resets from digital switching noise or ESD events on VCC, verified per Typical Operating Characteristics. |
Applications
| Battery-Powered Handheld Instruments | Industrial PLC I/O Modules |
|---|---|
|
Use Scenario: Portable multimeter with lithium coin-cell backup maintaining real-time clock and configuration memory during main power loss. IC Role / Device Role / Timing Role: Supervises 3.0V main rail and asserts open-drain RESET to halt µC execution and prevent corrupted EEPROM writes during brownout. Use Value: 1µA quiescent current extends battery life beyond 5 years; 2.32V threshold aligns precisely with 3V system undervoltage warning point. |
Use Scenario: DIN-rail mounted analog input module operating in electrically noisy factory environments with 24VDC-to-3.3V conversion. IC Role / Device Role / Timing Role: Monitors post-regulator 3.3V rail and generates clean, glitch-immune reset pulse to ARM Cortex-M4 controller after power cycling. Use Value: 200µs transient rejection prevents false resets from motor drive switching noise; SC70-3 footprint saves PCB area in space-constrained modules. |
| Medical Point-of-Care Diagnostics | Automotive Body Control Units (BCU) |
|
Use Scenario: Handheld blood glucose meter requiring FDA-grade reliability and zero-reset-failure operation during battery swap. IC Role / Device Role / Timing Role: Provides fail-safe power-on reset and brownout detection for safety-critical firmware boot sequence. Use Value: Guaranteed operation down to 1.2V VCC ensures valid reset assertion even with weak or aging batteries; ±2.5% tempco maintains accuracy across 0–50°C operating range. |
Use Scenario: Low-power CAN node in vehicle door module, powered from 12V battery via LDO, subject to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervises 3.3V microcontroller supply and coordinates reset timing with LIN/CAN transceiver power sequencing. Use Value: Open-drain output enables shared reset bus with other peripherals; 100ms timeout accommodates slow LDO startup after cold-crank recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6328UR23+T | SOT23-3 package (same pinout, larger footprint: 2.92mm × 1.3mm vs SC70's 1.25mm × 0.85mm); identical electrical specs. | Preferred where board assembly uses standard SOT23 pick-and-place tooling or thermal dissipation >320mW required. | Select MAX6328UR23+T when PCB layout accommodates larger package or higher power handling is needed. |
| MAX809TR23+T | Same 2.32V threshold and open-drain output, but higher 2.5µA max ICC; not specified below 1.8V VCC; no guaranteed operation below 1.8V. | Acceptable in non-battery-critical 3.3V systems where 1µA ultra-low current is not mandatory. | Choose MAX809TR23+T only if legacy design reuse or cost sensitivity outweighs ultra-low-power and wide-VCC-range requirements. |
Compared with MAX6328XR23+T, the MAX6328UR23+T offers identical supervision functionality in a larger, more thermally robust SOT23 package, while the MAX809TR23+T trades off quiescent current and low-VCC operation for broader legacy availability - making MAX6328XR23+T optimal for space- and battery-constrained new designs requiring guaranteed sub-1.8V operation.
Availability
MAX6328XR23+T is available at Aetrix Electronics and suitable for battery-powered handheld instruments, industrial PLC I/O modules, medical diagnostics devices, and automotive body control units requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6328XR23+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6326/MAX6327/MAX6328 family was designed specifically for ultra-low-power, precision voltage monitoring in portable and embedded microprocessor systems - prioritizing sub-1µA current, factory-trimmed thresholds, and robust transient immunity over general-purpose supervision.
FAQ
What is the exact reset threshold voltage of MAX6328XR23+T and how tightly is it specified?
The MAX6328XR23+T has a factory-trimmed nominal reset threshold of 2.32V, with ±1.5% tolerance at +25°C and ±2.5% over the full -40°C to +85°C operating range. This specification is guaranteed by production testing and documented in the Electrical Characteristics table of the official datasheet. The 2.32V value corresponds to the "R23" suffix in the part number and is optimized for reliable brownout detection in 3V systems.
Does MAX6328XR23+T support operation at VCC voltages below 1.8V, and what is its minimum functional VCC?
Yes, MAX6328XR23+T is fully specified to operate down to VCC = 1.2V over the entire -40°C to +85°C temperature range. Its internal circuitry remains functional and correctly asserts the open-drain RESET output even at this low supply level, ensuring valid reset behavior during deep brownout or weak battery conditions - a key differentiator from alternatives like MAX809TR23+T, which is not guaranteed below 1.8V.
What is the purpose of the open-drain RESET output in MAX6328XR23+T, and how should it be interfaced?
The open-drain RESET output in MAX6328XR23+T enables wired-OR connection with other reset sources (e.g., manual reset buttons or other supervisors) and direct compatibility with microprocessors having bidirectional reset pins, such as the Motorola 68HC11. It requires an external pull-up resistor (typically 10–100kΩ) to VCC or another logic rail. When asserted, RESET sinks up to 1.6mA with VOL ≤ 0.3V, ensuring solid low-state drive in noisy environments.
How does MAX6328XR23+T handle fast transients on the VCC line, and what is its maximum tolerable glitch duration?
MAX6328XR23+T is designed to ignore fast negative-going VCC transients. According to the Typical Operating Characteristics graph "Maximum Transient Duration vs. Reset Threshold Overdrive", it rejects glitches up to 200µs in duration when the overdrive (VTH – VCC) is 100mV. As the amplitude of the transient increases, the allowable pulse width decreases - for example, a 200mV overdrive permits only ~20µs. This immunity prevents false resets from digital switching noise or ESD coupling.
Is MAX6328XR23+T pin-compatible with other members of the MAX632x family, and what package options exist?
Yes, MAX6328XR23+T is pin-compatible with all SC70-3 variants in the MAX6326/MAX6327/MAX6328 series (e.g., MAX6326XR23+T, MAX6327XR23+T) and shares identical pinout (GND, RESET, VCC). It is also functionally and physically pin-compatible with the SOT23-3 version MAX6328UR23+T - same pin assignments and signal roles, differing only in package dimensions and thermal characteristics. Both packages use RoHS-compliant lead-free terminations indicated by the "+T" suffix.
MAX6328XR23+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-70, SOT-323
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.32V
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-3
MAX6328XR23+T FAQ
1.How can I place an order for MAX6328XR23+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6328XR23+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 MAX6328XR23+T reliable?
The price and inventory of MAX6328XR23+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6328XR23+T is usually 5 days.
3.What payment methods are accepted for MAX6328XR23+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6328XR23+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6328XR23+T?
MAX6328XR23+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6328XR23+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 MAX6328XR23+T?
For technical support, including MAX6328XR23+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6328XR23+T requirements.
6.How does Aetrix verify that MAX6328XR23+T is sourced from the original manufacturer or authorized distributors?
All MAX6328XR23+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 MAX6328XR23+T meets industry standards.
7.What is the process for return or replacement of MAX6328XR23+T?
All MAX6328XR23+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6328XR23+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 MAX6328XR23+T part is unused and in its original packaging.
Return procedure for MAX6328XR23+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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