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Analog Devices Inc./Maxim Integrated MAX6828ZUT+
- Part No.:
- MAX6828ZUT+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6828ZUT+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:698
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Product details
Overview
MAX6828ZUT+ from Maxim Integrated is an ultra-low-voltage dual microprocessor supervisory circuit in a 6-pin SOT23 package, featuring open-drain active-low RESET output, factory-trimmed VCC2 monitor (2.313V threshold), manual reset input (MR), and watchdog timer (1.6s timeout). It monitors primary supply VCC (2.25V to 2.38V range) and secondary supply VCC2 down to +0.9V, with guaranteed reset validity down to VCC = +1.0V. It is used in portable battery-powered equipment requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6828ZUT+ datasheet, MAX6828ZUT+ pinout, MAX6828ZUT+ application, or MAX6828ZUT+ equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior (140ms min reset timeout, 1.6s watchdog period), true design implications of open-drain RESET, and validated alternative parts for multivoltage µP monitoring systems.
Technical Context
The MAX6828ZUT+ integrates two independent voltage monitors: one for primary VCC (programmed to 2.32V nominal, ±0.06V over -40°C to +125°C) and one factory-trimmed VCC2 monitor (2.313V nominal, ±0.075V over temperature). Its open-drain RESET output enables direct interfacing with bidirectional µP reset pins (e.g., Motorola 68HC11) using a single external pullup resistor.
It implements a 1.6s watchdog timer cleared on any WDI edge, with MR input featuring internal 50kΩ pullup and 200ns glitch rejection. Reset assertion occurs when VCC, VCC2, or MR falls below threshold, and reset remains asserted for ≥140ms after all conditions recover - ensuring stable processor initialization during power transients.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 2.32V (min 2.24V, max 2.40V at -40°C to +125°C) - sets primary supply brownout detection point for 2.5V/2.3V rail systems |
| VCC2 Threshold | 2.313V (min 2.238V, max 2.388V at -40°C to +125°C) - factory-trimmed secondary supply monitor for 2.5V I/O rails |
| Reset Timeout Period | 140ms minimum - ensures µP completes power-up sequence before release, even under slow-ramp conditions |
| Watchdog Timeout | 1.6s nominal (0.8s–2.6s over -40°C to +125°C) - provides software execution supervision without excessive false triggers |
| RESET Output Type | Open-drain active-low - allows wired-OR reset bus sharing and compatibility with bidirectional µP reset I/O |
| Supply Current (VCC) | 25µA max at -40°C to +125°C, VCC = +3.6V - enables use in always-on battery-backed subsystems |
| Operating Voltage Range | +1.2V to +5.5V (VCC), -40°C to +125°C - supports operation during deep brownout while maintaining reset integrity |
Pinout & Package
Package: 6-pin SOT23 (U6+1 outline, land pattern 90-0175), RoHS-compliant, lead-free (+T suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low open-drain reset output - requires external pullup; asserts low on VCC/VCC2 fault, MR low, or watchdog timeout |
| 2 | GND | Ground reference for all internal comparators and logic - must be low-impedance connection to system ground plane |
| 3 | MR | Manual reset input, active-low with internal 50kΩ pullup to VCC - momentary GND connection forces system reset |
| 4 | WDI | Watchdog input - toggling within 1.6s prevents reset; left floating or three-stated disables watchdog function |
| 5 | VCC2 | Secondary supply input - connected directly to monitored 2.5V/2.3V rail; factory-trimmed comparator threshold 2.313V |
| 6 | VCC | Primary supply input - powers device and sets VCC monitor threshold (2.32V); valid down to +1.0V |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed dual-voltage monitoring | Simultaneous VCC (2.32V) and VCC2 (2.313V) supervision eliminates need for external resistor dividers or second supervisor IC |
| Open-drain RESET with no internal pullup | Enables shared reset bus architecture and direct interface to µPs with bidirectional reset I/O (e.g., 68HC11), reducing BOM count |
| Guaranteed reset validity to VCC = +1.0V | Ensures clean reset assertion during severe brownout or battery depletion - critical for data retention in portable systems |
| 1.6s watchdog timer with edge-triggered clear | Prevents runaway code without requiring precise pulse timing; tolerates software jitter by clearing on any WDI transition |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without spurious reset - avoids false triggers in electrically noisy environments |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Handheld medical meters powered by single Li-ion cell with 2.5V I/O rail and 1.8V core supply. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting open-drain RESET to ARM Cortex-M0 during battery voltage sag below 2.3V or I/O rail dropout. Use Value: Prevents corrupted EEPROM writes and sensor read errors by holding µP in reset until both rails stabilize post-brownout. |
Use Scenario: Industrial PLC module with isolated 2.5V communication interface and 3.3V logic supply. IC Role / Device Role / Timing Role: Monitors 2.5V I/O rail (VCC2) and 3.3V logic rail (VCC) independently; asserts RESET if either drops below threshold. Use Value: Eliminates need for separate supervisors per rail, reducing PCB area and enabling synchronized reset across isolated domains. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Portable oscilloscope with FPGA-based signal processing and analog front-end powered from split 2.5V/1.2V supplies. IC Role / Device Role / Timing Role: Uses VCC2 pin to monitor 2.5V analog supply; VCC pin monitors 1.2V FPGA core rail via resistor divider (not applicable here - MAX6828 has fixed VCC2 only). Use Value: Ensures analog acquisition circuitry powers up fully before FPGA configures - preventing ADC saturation or DAC offset errors. |
Use Scenario: Automotive body control module requiring fail-safe reset during cold-crank (battery dips to 6V then recovers). IC Role / Device Role / Timing Role: Supervises 2.5V microcontroller I/O supply (VCC2) and 5V system rail (VCC) with 140ms timeout to tolerate slow recovery. Use Value: Guarantees µP remains held in reset until both supplies exceed thresholds and stabilize - avoiding race conditions during crank-to-run transition. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6831ZUT+ | Same pinout, same VCC/VCC2 thresholds, but includes factory-trimmed VCC2 monitor and open-drain RESET - identical functionality and electrical specs | No functional difference; MAX6831ZUT+ is the direct replacement part number per Maxim's Selector Guide for Z-suffix open-drain variants | Select MAX6831ZUT+ when sourcing new production - it supersedes MAX6828ZUT+ per Maxim's revision history and ordering documentation |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only), push-pull RESET, no VCC2 monitor, 200ms reset timeout, 3.3V fixed threshold | Cannot monitor dual rails; requires external circuitry to supervise secondary supply; lacks watchdog input | Use only if system has single 3.3V rail and no watchdog requirement; not a functional substitute for dual-rail, watchdog-enabled supervision |
Compared with MAX6828ZUT+, MAX6831ZUT+ offers identical dual-supply monitoring, open-drain RESET, and watchdog capability with full pin-and-function compatibility, while TPS3808G33DBVR provides only single-rail supervision and lacks VCC2 monitoring - making it unsuitable for applications requiring coordinated reset of primary and secondary supplies.
Availability
MAX6828ZUT+ 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 industrial temperature ranges (-40°C to +125°C).
Supply support for MAX6828ZUT+ 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 designs precision analog, mixed-signal, and high-reliability semiconductor solutions for industrial, medical, communications, and consumer applications.
The MAX6826–MAX6831 family was developed specifically for ultra-low-voltage dual-rail microprocessor supervision in space-constrained, battery-sensitive systems - emphasizing guaranteed operation down to VCC = +1.0V and factory-trimmed accuracy for multivoltage SoC platforms.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6828ZUT+?
The MAX6828ZUT+ has a factory-trimmed VCC2 reset threshold of 2.313V (typical), with a guaranteed range of 2.238V to 2.388V over the full operating temperature range of -40°C to +125°C. This value is specified in the Electrical Characteristics table under "VCC2 Reset Threshold" for suffix Z, and applies exclusively to the VCC2 pin - not adjustable via external components.
Does MAX6828ZUT+ support manual reset functionality, and how is it implemented?
Yes, MAX6828ZUT+ includes a dedicated manual reset (MR) input on Pin 3. It is active-low with an internal 50kΩ pullup resistor to VCC, allowing direct connection of a momentary switch to GND. When pulled low, MR forces RESET assertion for the full reset timeout period (≥140ms) after release. No external pullup is required, and MR accepts standard CMOS logic levels.
What is the watchdog timeout period of MAX6828ZUT+, and how is it cleared?
The MAX6828ZUT+ features a nominal 1.6s watchdog timeout period (0.8s to 2.6s over temperature), cleared on any rising or falling edge at the WDI pin (Pin 4). The timer resets automatically when RESET is asserted, MR is pulled low, or a valid WDI transition occurs - eliminating need for precise pulse timing and supporting robust software supervision.
Can MAX6828ZUT+ monitor a secondary supply lower than 2.3V, such as 1.8V or 1.2V?
No - MAX6828ZUT+ uses a factory-trimmed VCC2 monitor fixed at 2.313V and does not support user-adjustable thresholds on the VCC2 pin. For monitoring 1.8V or 1.2V rails, select MAX6826ZUT+ or MAX6827ZUT+, which provide the RESET IN pin for external resistor-divider configuration down to 0.63V threshold.
Is MAX6828ZUT+ pin-compatible with other devices in the MAX6826–MAX6831 family?
Yes, all MAX6826–MAX6831 devices share the same 6-pin SOT23 package and pinout. MAX6828ZUT+ uses Pins 1–6 identically to MAX6826ZUT+, MAX6827ZUT+, and MAX6831ZUT+, including RESET (Pin 1), GND (Pin 2), MR (Pin 3), WDI (Pin 4), VCC2 (Pin 5), and VCC (Pin 6) - enabling drop-in substitution where functional requirements match.
MAX6828ZUT+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.32V, 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-6
MAX6828ZUT+ FAQ
1.How can I place an order for MAX6828ZUT+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6828ZUT+ 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 MAX6828ZUT+ reliable?
The price and inventory of MAX6828ZUT+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6828ZUT+ is usually 5 days.
3.What payment methods are accepted for MAX6828ZUT+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6828ZUT+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6828ZUT+?
MAX6828ZUT+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6828ZUT+ 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 MAX6828ZUT+?
For technical support, including MAX6828ZUT+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6828ZUT+ requirements.
6.How does Aetrix verify that MAX6828ZUT+ is sourced from the original manufacturer or authorized distributors?
All MAX6828ZUT+ 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 MAX6828ZUT+ meets industry standards.
7.What is the process for return or replacement of MAX6828ZUT+?
All MAX6828ZUT+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6828ZUT+, 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 MAX6828ZUT+ part is unused and in its original packaging.
Return procedure for MAX6828ZUT+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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