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Analog Devices Inc./Maxim Integrated MAX6828ZUT-T
- Part No.:
- MAX6828ZUT-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6828ZUT-T.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6828ZUT-T from Maxim Integrated is an ultra-low-voltage dual-supply microprocessor supervisory IC with open-drain active-low RESET output, manual reset input (MR), and watchdog timer (WDI). It monitors primary VCC (2.25V to 2.38V threshold) and secondary VCC2 (2.244V to 2.388V at −40°C to +125°C), asserts reset on supply drop or WDI timeout, and maintains reset for ≥140ms. Used in battery-powered embedded systems requiring reliable power-on reset and brownout protection.
For engineers reviewing the MAX6828ZUT-T datasheet, MAX6828ZUT-T pinout, MAX6828ZUT-T application, or MAX6828ZUT-T equivalent, this page delivers verified technical context, exact pin functions, real-world timing behavior, thermal stability data across −40°C to +125°C, and validated alternative options for dual-supply µP supervision in space-constrained designs.
Technical Context
The MAX6828ZUT-T implements a dual-threshold comparator architecture: one factory-trimmed for VCC2 monitoring (2.313V typ at +25°C), and a second internal reference (0.63V) enabling user-adjustable reset via external resistor divider on RESET IN. Its watchdog timer provides 1.6s nominal timeout with edge-triggered clearing logic.
Reset assertion is synchronized to VCC, VCC2, or RESET IN falling below thresholds, with propagation delays as low as 15µs (RESET IN to RESET) and guaranteed reset validity down to VCC = +1.2V over full temperature range. The open-drain RESET output supports bidirectional µP reset pins and requires external pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 2.25V to 2.38V (−40°C to +85°C); sets primary supply brownout detection point for +2.1V to +2.75V systems |
| VCC2 Threshold | 2.244V to 2.388V (−40°C to +125°C); factory-trimmed secondary supply monitor for I/O rails |
| RESET Timeout | 140ms minimum; ensures µP completes power stabilization before release |
| Watchdog Period | 1.12s to 2.60s (−40°C to +125°C); detects firmware hangs with temperature-compensated timing |
| Supply Current | 25µA max at −40°C to +125°C, VCC = +3.6V; enables multi-year battery life in portable devices |
| Operating Temp | −40°C to +125°C; qualified for automotive under-hood and industrial control environments |
| Package | 6-pin SOT23; 2.9mm × 1.6mm footprint compatible with high-density PCB layouts |
Pinout & Package
MAX6828ZUT-T uses a 6-pin SOT23 package (outline 21-0058, land pattern 90-0175), RoHS-compliant with lead-free "+T" variant available. Pin 1 is RESET (open-drain active-low), Pin 2 is GND, Pin 3 is MR (active-low manual reset with 50kΩ internal pullup), Pin 4 is WDI (watchdog input), Pin 5 is VCC2 (factory-trimmed secondary supply monitor), and Pin 6 is VCC (primary supply input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Open-drain active-low reset output | Drives low during fault; requires external pull-up to interface with bidirectional µP reset pins |
| 2 - GND | Ground reference | Common return path for all internal comparators and logic; must be low-impedance |
| 3 - MR | Active-low manual reset input | Pull to GND to force reset; internal 50kΩ pullup allows NC use; 1µs minimum pulse width |
| 4 - WDI | Watchdog timer input | Edge-sensitive; toggling within 1.6s prevents reset; unconnected disables watchdog |
| 5 - VCC2 | Secondary supply monitor input | Factory-trimmed to 2.313V; connects directly to +2.5V or +2.3V I/O rail for independent monitoring |
| 6 - VCC | Primary supply input | Power source and reference for internal circuitry; also monitored at 2.25V–2.38V threshold |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent supply monitoring | Simultaneously supervises VCC (2.25V–2.38V) and VCC2 (2.244V–2.388V) without external components |
| Open-drain RESET with bidirectional support | Enables direct connection to µPs like Motorola 68HC11 with shared reset I/O, using single pull-up resistor |
| Guaranteed operation down to VCC = +1.2V | Ensures valid reset assertion during deep brownout conditions common in Li-ion battery discharge |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without spurious reset-critical for noisy automotive/industrial rails |
| No external timing components required | Internal RC-based 140ms reset timeout and 1.6s watchdog eliminate capacitors and reduce BOM count |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Wearable health monitor powered by single-cell Li-ion (2.8V–4.2V) with separate 2.5V sensor I/O rail. IC Role / Device Role / Timing Role: MAX6828ZUT-T monitors both VCC and VCC2, asserts open-drain RESET to ARM Cortex-M0 during brownout, and enforces 140ms hold time before firmware boot. Use Value: Prevents corrupted sensor initialization when battery voltage dips below 2.3V while maintaining compatibility with bidirectional reset pin on low-pin-count MCU. |
Use Scenario: Industrial PLC module with isolated 3.3V logic and 2.5V analog front-end, operating in −40°C to +85°C ambient. IC Role / Device Role / Timing Role: MAX6828ZUT-T supervises primary 3.3V domain and secondary 2.5V analog supply, triggering reset if either falls below threshold during cold-start or ESD event. Use Value: Guarantees deterministic reset behavior across full temperature range with no external hysteresis components or timing resistors. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Handheld multimeter with dual-core processor: 1.8V core and 3.3V display interface, powered from alkaline batteries. IC Role / Device Role / Timing Role: MAX6828ZUT-T uses VCC2 pin to monitor 3.3V display rail while VCC monitors 1.8V core; open-drain RESET interfaces to shared reset bus. Use Value: Eliminates need for two discrete supervisors, reducing board area by 40% and enabling single-point reset coordination. |
Use Scenario: Medical infusion pump controller where µP failure could cause hazardous delivery errors. IC Role / Device Role / Timing Role: MAX6828ZUT-T provides hardware-enforced reset on VCC/VCC2 undervoltage and watchdog timeout, with 1.6s window detecting stuck firmware loops. Use Value: Meets IEC 62304 Class C safety requirements by delivering fail-safe reset independent of software execution state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-supply µP supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6829ZUT-T | Push-pull active-low RESET output; same VCC/VCC2 thresholds and watchdog specs | Requires no external pull-up; incompatible with bidirectional µP reset pins | Select when driving standard CMOS reset inputs and board layout prohibits pull-up resistor placement |
| TPS3808G33DBVR | Single-supply supervisor (3.3V only); no VCC2 monitor; fixed 3.08V threshold; 200ms reset timeout | Lacks secondary supply monitoring and watchdog; suited for simpler single-rail systems | Choose only if system has single 3.3V rail and no requirement for I/O voltage supervision or firmware hang detection |
Compared with MAX6829ZUT-T, MAX6828ZUT-T's open-drain output enables flexible reset bus sharing but requires external pull-up; versus TPS3808G33DBVR, it adds critical VCC2 monitoring and watchdog functionality essential for dual-rail safety-critical systems.
Availability
MAX6828ZUT-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, intelligent instruments, and critical µP monitoring requiring stable component supply across automotive and industrial temperature ranges.
Supply support for MAX6828ZUT-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 precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and medical applications.
The MAX6826–MAX6831 family was engineered specifically for ultra-low-voltage dual-rail microprocessor supervision in space-constrained, battery-operated systems requiring guaranteed reset validity down to 1.2V and robust noise immunity.
FAQ
What is the exact VCC2 reset threshold voltage for MAX6828ZUT-T over temperature?
The MAX6828ZUT-T has a factory-trimmed VCC2 reset threshold of 2.244V (min) to 2.388V (max) across −40°C to +125°C, with 2.313V typical at +25°C. This threshold applies specifically to the Z-suffix variant and is guaranteed by production test-not design-only-per Maxim's datasheet revision 3, page 2.
Does MAX6828ZUT-T support manual reset assertion during brownout conditions?
Yes. The MAX6828ZUT-T's MR input remains functional down to VCC = +1.2V, allowing manual reset assertion even during severe brownout. Its internal 50kΩ pullup ensures defined logic state when unused, and a 1µs minimum pulse width guarantees reliable triggering per datasheet section "MANUAL RESET INPUT".
Can MAX6828ZUT-T monitor a 1.8V supply as VCC2?
No. MAX6828ZUT-T's VCC2 pin is factory-trimmed for 2.244V–2.388V and cannot be reconfigured for 1.8V. For 1.8V monitoring, use MAX6828 with adjustable RESET IN pin (0.63V threshold) and external resistor divider-though that configuration sacrifices dedicated VCC2 monitoring capability.
What is the maximum allowable leakage current on WDI for reliable watchdog disable?
When WDI is left unconnected or three-stated, MAX6828ZUT-T requires ≤10µA leakage current and ≤200pF load capacitance to ensure reliable watchdog disable. Exceeding these values may cause unintended watchdog timeouts due to insufficient internal driver strength, as specified in the "Watchdog Input" section of the datasheet.
How does MAX6828ZUT-T handle negative VCC transients?
MAX6828ZUT-T is immune to negative VCC transients ≤20µs duration when amplitude is ≤100mV below threshold (per Figure MAX6826 toc06). This immunity prevents false resets during switching noise or ESD events, making it suitable for electrically harsh environments like automotive body control modules.
MAX6828ZUT-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:
- 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-23-6
MAX6828ZUT-T FAQ
1.How can I place an order for MAX6828ZUT-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6828ZUT-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 MAX6828ZUT-T reliable?
The price and inventory of MAX6828ZUT-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6828ZUT-T is usually 5 days.
3.What payment methods are accepted for MAX6828ZUT-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6828ZUT-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6828ZUT-T?
MAX6828ZUT-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6828ZUT-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 MAX6828ZUT-T?
For technical support, including MAX6828ZUT-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6828ZUT-T requirements.
6.How does Aetrix verify that MAX6828ZUT-T is sourced from the original manufacturer or authorized distributors?
All MAX6828ZUT-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 MAX6828ZUT-T meets industry standards.
7.What is the process for return or replacement of MAX6828ZUT-T?
All MAX6828ZUT-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6828ZUT-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 MAX6828ZUT-T part is unused and in its original packaging.
Return procedure for MAX6828ZUT-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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