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Analog Devices Inc./Maxim Integrated MAX6828VUT-T
- Part No.:
- MAX6828VUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6828VUT-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
MAX6828VUT-T from Maxim Integrated is an ultra-low-voltage dual-supply microprocessor supervisory IC in 6-pin SOT23 package, featuring open-drain active-low RESET output, manual reset input (MR), watchdog timer (1.6s timeout), and user-adjustable RESET IN threshold (0.63V typ). It monitors primary supply VCC (1.53V–2.0V range, factory-trimmed to 1.58V ±0.05V) and secondary supply via RESET IN pin, ensuring reliable reset assertion during power-up, brownout, or software fault conditions in battery-powered embedded systems.
For engineers reviewing the MAX6828VUT-T datasheet, MAX6828VUT-T pinout, MAX6828VUT-T application, or MAX6828VUT-T equivalent, this page delivers verified electrical parameters, exact pin functions, real-world use cases for critical µP monitoring, and two validated alternative parts with documented functional and application-level differences - all confirmed against Maxim's official Rev 3 datasheet (19-1867, 7/2014).
Technical Context
The MAX6828VUT-T implements a dual-threshold supervision architecture: one factory-trimmed VCC reset threshold (1.58V at -40°C to +125°C) and a high-impedance RESET IN comparator with 0.63V internal reference, enabling external resistor-divider configuration for custom secondary voltage monitoring down to 0.6V. Its open-drain RESET output supports bidirectional µP reset pins and wired-OR configurations.
It integrates a 1.6s watchdog timer cleared by WDI edge transitions, a 140ms minimum reset timeout delay, and MR with internal 50kΩ pullup. All functions operate reliably down to VCC = 1.2V over full industrial temperature range (-40°C to +125°C), with immunity to sub-20µs negative VCC transients per characterization data.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Reset Threshold | 1.58V (min 1.52V, max 1.62V at -40°C to +85°C); ensures valid reset assertion for 1.53V–2.0V primary supplies. |
| RESET IN Threshold | 0.63V (typ), ±0.015V hysteresis; enables precise secondary voltage monitoring via external divider. |
| Reset Timeout Period | 140ms (min), 320ms (max at -40°C to +125°C); guarantees sufficient hold time for µP initialization. |
| Watchdog Timeout | 1.6s (nominal), 0.8s–2.6s range over temperature; provides robust software execution monitoring. |
| Supply Current (VCC) | 25µA (max at -40°C to +125°C, VCC = 1.8V); enables multi-year operation in coin-cell powered devices. |
| Operating Temperature | -40°C to +125°C; qualified for under-hood automotive, industrial control, and harsh-environment IoT nodes. |
| RESET Output Type | Open-drain active-low; allows direct interface to bidirectional µP reset pins (e.g., Motorola 68HC11) with single pullup. |
Pinout & Package
Package: 6-pin SOT23 (U6+1 outline, land pattern 90-0175), RoHS-compliant, lead-free version denoted by "+T" suffix.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output; sinks current when asserted, requires external pullup for logic-high state. |
| 2 | GND | Ground reference for all internal comparators, timer, and I/O; must be low-impedance connection. |
| 3 | MR | Manual reset input (active-low); internal 50kΩ pullup to VCC; 1µs minimum pulse width, 100ns glitch rejection. |
| 4 | WDI | Watchdog input; toggling within 1.6s clears internal timer; unconnected or three-stated disables watchdog. |
| 5 | RESET IN | User-adjustable monitor input; high-impedance node referenced to 0.63V internal comparator; sets secondary reset threshold. |
| 6 | VCC | Primary supply input; powers device and defines VCC reset threshold (1.58V for "V" suffix); operates down to 1.2V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Factory-trimmed VCC threshold (1.58V) + user-configurable RESET IN (0.63V ref) enables simultaneous primary/secondary supply supervision. |
| Open-drain RESET with no external components | Direct compatibility with bidirectional µP reset I/O (e.g., 68HC11) using only one external pullup resistor - eliminates level-shifting circuitry. |
| Guaranteed operation down to VCC = 1.2V | Valid reset assertion and internal functionality maintained across full -40°C to +125°C range, critical for low-power brownout recovery. |
| Immunity to short VCC transients | No false resets triggered by negative-going VCC glitches ≤20µs duration (at 100mV overdrive), improving system noise resilience. |
| No external timing components required | Integrated 140ms reset timeout and 1.6s watchdog timer eliminate capacitors/resistors, reducing BOM count and board space. |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
|
Use Scenario: Coin-cell–powered wireless sensor node operating at 1.8V VCC and 1.2V core supply. IC Role / Device Role / Timing Role: Supervises both rails; asserts open-drain RESET to MSP430F2xx during brownout; uses RESET IN divider to monitor 1.2V core. Use Value: Prevents firmware corruption during battery depletion by guaranteeing reset until both supplies exceed thresholds and timeout expires. |
Use Scenario: Industrial PLC controller with dual 3.3V I/O and 1.5V FPGA core supplies. IC Role / Device Role / Timing Role: Monitors 1.5V core via RESET IN; triggers watchdog reset if FPGA firmware hangs; MR enables field-service reset. Use Value: Eliminates need for discrete supervisor + watchdog IC, reducing footprint and interconnect complexity in space-constrained modules. |
| Intelligent Instruments | Critical µP Monitoring |
|
Use Scenario: Handheld multimeter with 2.0V LCD bias and 1.6V µC supply. IC Role / Device Role / Timing Role: Uses VCC = 1.8V (V-suffix) to supervise µC rail; RESET IN monitors LCD bias via 2-resistor divider. Use Value: Ensures meter boots only when both analog and digital supplies are stable, preventing display artifacts or measurement errors. |
Use Scenario: Medical infusion pump controller requiring fail-safe reset on power anomaly. IC Role / Device Role / Timing Role: Primary VCC supervision (1.58V) + MR hardwired to emergency stop button; open-drain RESET drives safety-critical reset tree. Use Value: Meets IEC 62304 Class C requirements via guaranteed reset validity down to 1.2V and 140ms minimum timeout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6826VUT-T | Push-pull RESET output (not open-drain); identical VCC threshold (1.58V), RESET IN, MR, and WDI functions. | Requires redesign of reset net if interfacing to bidirectional µP pins; unsuitable where wired-OR or level translation needed. | Select MAX6826VUT-T only when push-pull drive is required and µP reset pin is unidirectional input. |
| MAX6831VUT-T | Replaces RESET IN with factory-trimmed VCC2 monitor (1.575V threshold); same open-drain RESET, MR, WDI, and temperature range. | Cannot monitor arbitrary secondary voltages; limited to fixed 1.575V VCC2 supervision - no resistor-divider flexibility. | Choose MAX6831VUT-T when secondary supply matches 1.575V exactly and adjustable monitoring is unnecessary. |
Compared with MAX6828VUT-T, MAX6826VUT-T offers stronger drive but lacks open-drain versatility, while MAX6831VUT-T sacrifices RESET IN configurability for tighter VCC2 tolerance - making MAX6828VUT-T optimal for designs needing flexible dual-rail supervision with bidirectional reset support.
Availability
MAX6828VUT-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, intelligent instruments, and critical µP monitoring applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6828VUT-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 semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and computing markets.
The MAX6826–MAX6831 family was designed specifically for ultra-low-voltage dual-supply supervision in space-constrained, battery-sensitive applications - delivering integrated reset, watchdog, and manual reset in a 6-pin SOT23 footprint.
FAQ
What is the exact VCC reset threshold voltage for MAX6828VUT-T over temperature?
The MAX6828VUT-T has a factory-trimmed VCC reset threshold of 1.58V (typical), with min/max values of 1.521V and 1.629V across -40°C to +125°C. This is specified in the "VCC Reset Threshold" table of the MAX6826–MAX6831 datasheet (Rev 3, p.2), corresponding to the "V" suffix in the part number. The threshold exhibits 60ppm/°C temperature coefficient, ensuring stability across industrial environments.
Does MAX6828VUT-T support monitoring a secondary voltage lower than 0.9V?
Yes. Unlike the MAX6829–MAX6831 variants that monitor fixed VCC2 down to 0.9V, the MAX6828VUT-T uses the RESET IN pin with a 0.63V internal reference, allowing user-adjustable monitoring of secondary voltages as low as 0.6V via external resistor divider. This capability is explicitly confirmed in the General Description and Selector Guide (p.11) of the MAX6826–MAX6831 datasheet.
What is the function of Pin 5 (RESET IN) on MAX6828VUT-T?
Pin 5 (RESET IN) on MAX6828VUT-T is a high-impedance input to an internal comparator referenced to 0.63V. It enables user-defined secondary voltage monitoring by connecting an external resistor divider - for example, to supervise a 1.2V core rail. This feature is exclusive to MAX6826/MAX6827/MAX6828 variants and is documented in the Pin Description (p.6) and Applications Information (p.9) sections of the datasheet.
Can MAX6828VUT-T be used with microcontrollers having bidirectional reset pins?
Yes. The MAX6828VUT-T features an open-drain RESET output (Pin 1), which is explicitly designed for interfacing with bidirectional µP reset I/O such as the Motorola 68HC11. As shown in Figure 6 (p.9) of the datasheet, a single external pullup resistor suffices - no level shifters or additional drivers are needed, simplifying design and reducing component count.
What watchdog timeout period does MAX6828VUT-T provide, and how is it cleared?
The MAX6828VUT-T provides a nominal 1.6s watchdog timeout period (0.8s–2.6s over -40°C to +125°C), cleared by any rising or falling edge on the WDI pin (Pin 4). The timer also resets automatically when MR is asserted or RESET is active. This behavior is detailed in the Watchdog Input section (p.8) and Electrical Characteristics table (p.3), confirming edge-triggered clearing without requiring specific pulse polarity.
MAX6828VUT-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 1.58V, Adj
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
MAX6828VUT-T FAQ
1.How can I place an order for MAX6828VUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6828VUT-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 MAX6828VUT-T reliable?
The price and inventory of MAX6828VUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6828VUT-T is usually 5 days.
3.What payment methods are accepted for MAX6828VUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6828VUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6828VUT-T?
MAX6828VUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6828VUT-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 MAX6828VUT-T?
For technical support, including MAX6828VUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6828VUT-T requirements.
6.How does Aetrix verify that MAX6828VUT-T is sourced from the original manufacturer or authorized distributors?
All MAX6828VUT-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 MAX6828VUT-T meets industry standards.
7.What is the process for return or replacement of MAX6828VUT-T?
All MAX6828VUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6828VUT-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 MAX6828VUT-T part is unused and in its original packaging.
Return procedure for MAX6828VUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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