My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX6828SUT+T
- Part No.:
- MAX6828SUT+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6828SUT+T.pdf
- Description:
- IC MPU SUPERVISOR SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,050
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX6828SUT+T from Maxim Integrated is an ultra-low-voltage dual microprocessor supervisory circuit in a 6-pin SOT23 package, designed to monitor primary supply (VCC) at 3.08V ±3% and secondary supply (VCC2) at 2.188V ±3%, with open-drain active-low RESET output, manual reset input (MR), and 1.6s watchdog timeout. It ensures reliable power-up/power-down sequencing in battery-powered embedded systems.
For engineers reviewing the MAX6828SUT+T datasheet, MAX6828SUT+T pinout, MAX6828SUT+T application, or MAX6828SUT+T equivalent, this page delivers verified functional identity, precise threshold voltages, reset timing behavior, watchdog interaction logic, and validated alternative options for dual-supply µP monitoring in industrial and portable designs.
Technical Context
The MAX6828SUT+T integrates two independent voltage comparators-one factory-trimmed for VCC2 at 2.188V (Y-suffix), one preprogrammed for VCC at 3.08V (S-suffix)-with a shared 140ms minimum reset timeout delay and 1.6s watchdog timer. Its open-drain RESET output enables bidirectional reset pin interfacing (e.g., Motorola 68HC11) via external pullup.
It features guaranteed reset assertion down to VCC = +1.2V over full temperature range (–40°C to +125°C), immunity to negative VCC transients ≤20µs at 100mV overdrive, and no external components required. MR includes internal 50kΩ pullup; WDI accepts CMOS-level edges and disables watchdog when floating or three-stated.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Threshold | 3.08V ±3% (S-suffix); asserts reset if primary supply drops below this level during brownout |
| VCC2 Threshold | 2.188V ±3% (Y-suffix); monitors secondary supply without external resistor divider |
| Reset Timeout Period | 140ms min; holds RESET low after all supplies recover, ensuring µP initialization completes |
| Watchdog Timeout | 1.6s nominal; triggers reset if WDI lacks edge transition, preventing firmware lockup |
| RESET Output Type | Open-drain active-low; supports wired-OR configuration and bidirectional µP reset I/O |
| Operating Voltage Range | +1.2V to +5.5V (VCC); valid reset operation guaranteed down to +1.2V over –40°C to +125°C |
| Supply Current | 7µA typ at +3.6V, –40°C to +85°C; enables multi-year battery life in portable equipment |
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 for logic-high state |
| 2 | GND | Ground reference for all internal comparators and logic |
| 3 | MR | Manual reset input (active-low); internal 50kΩ pullup to VCC; resets µP on logic-low pulse ≥1µs |
| 4 | WDI | Watchdog input; edge-sensitive (rising/falling); clears 1.6s timer on transition; disabled when floating |
| 5 | VCC2 | Secondary supply input; factory-trimmed comparator input for +2.188V threshold monitoring |
| 6 | VCC | Primary supply input; connects to main system rail; powers internal circuitry and references VCC2/VTH |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitoring | Simultaneously supervises VCC (3.08V) and VCC2 (2.188V) with separate comparators-no shared reference error |
| Open-drain RESET with bidirectional support | Enables direct interface to µPs with bidirectional reset pins (e.g., 68HC11) using single external pullup resistor |
| Guaranteed operation down to VCC = +1.2V | Ensures valid reset assertion during deep brownout conditions across full industrial temperature range |
| No external components required | Eliminates BOM cost and layout area for RC networks, precision references, or discrete supervisors |
| Watchdog with glitch-immune edge detection | Accepts 50ns minimum WDI pulses; immune to noise-induced false timeouts due to transient rejection |
Applications
| Portable/Battery-Powered Equipment | Embedded Controllers |
|---|---|
Use Scenario: Long-life handheld medical devices powered by single Li-ion cell with dual-rail (3.3V I/O, 1.8V core) regulation. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting open-drain RESET to coordinate safe boot after both rails stabilize. Use Value: Prevents erratic µP execution during partial power-up; 7µA quiescent current extends battery runtime. |
Use Scenario: Industrial PLC controller with isolated 5V and 3.3V domains requiring synchronized reset on power loss. IC Role / Device Role / Timing Role: Primary VCC (3.08V) and secondary VCC2 (2.188V) monitoring with 140ms timeout to ensure FPGA configuration completes. Use Value: Eliminates need for discrete reset ICs per rail; single SOT23 reduces PCB footprint by >60% vs. dual discrete solution. |
| Intelligent Instruments | Critical µP Monitoring |
Use Scenario: Portable multimeter with real-time clock (RTC) backup rail and main processor supply. IC Role / Device Role / Timing Role: VCC2 monitors 2.188V RTC supply while VCC monitors 3.08V main processor rail; open-drain RESET drives shared reset bus. Use Value: Factory-trimmed thresholds remove calibration burden; 1.6s watchdog prevents firmware hang during sensor polling loops. |
Use Scenario: Automotive body control module where µP must restart within 200ms of supply recovery after load dump. IC Role / Device Role / Timing Role: Supervises 3.08V main MCU supply and 2.188V CAN transceiver supply; asserts RESET until both exceed thresholds +140ms timeout. Use Value: Meets ISO 16750-2 cold-cranking voltage dip requirements; -40°C to +125°C rating ensures reliability under hood conditions. |
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 |
|---|---|---|---|
| MAX6828SUT-T | Same functionality and pinout, but leaded (SnPb) packaging instead of lead-free (+T) | Requires Pb-containing solder process; not compliant with RoHS Directive 2011/65/EU | Select only for legacy manufacturing lines certified for SnPb assembly |
| MAX6831SUT+T | Identical package and pinout; differs in VCC2 threshold (1.575V V-suffix vs. 2.188V Y-suffix) and includes factory-trimmed VCC2 monitor | Suitable for systems with lower secondary supply (e.g., 1.5V core rails); same open-drain RESET and watchdog behavior | Choose when secondary supply is 1.5V instead of 2.2V; verify VCC2 threshold match before substitution |
Compared with MAX6828SUT+T, MAX6828SUT-T offers identical electrical performance but requires Pb-based reflow, while MAX6831SUT+T maintains pin compatibility but shifts VCC2 monitoring to 1.575V-making it suitable only for lower-voltage secondary rails without redesigning the power architecture.
Availability
MAX6828SUT+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, embedded controllers, and intelligent instruments requiring stable component supply with guaranteed long-term availability and RoHS-compliant packaging.
Supply support for MAX6828SUT+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 and mixed-signal ICs for power, sensing, and connectivity applications, with focus on high-reliability industrial and automotive markets.
The MAX6826–MAX6831 family was engineered specifically for dual-rail microprocessor supervision in space-constrained, battery-sensitive systems-delivering factory-trimmed thresholds, integrated watchdog, and guaranteed operation down to 1.2V in SOT23.
FAQ
What is the exact VCC reset threshold voltage for MAX6828SUT+T?
The MAX6828SUT+T has a VCC reset threshold of 3.08V, with ±3% tolerance over the full operating temperature range (–40°C to +125°C). This value is fixed by the "S" suffix in the part number and is factory-trimmed-not user-adjustable. The threshold remains stable with a temperature coefficient of 60ppm/°C, ensuring consistent brownout detection across environmental conditions. MAX6828SUT+T guarantees reset assertion when VCC falls below this level and holds RESET active for ≥140ms after recovery.
Does MAX6828SUT+T support monitoring a secondary supply below 2.0V?
No-MAX6828SUT+T is configured with the "Y" suffix for VCC2, setting its secondary supply threshold at 2.188V ±3%. It does not support sub-2.0V secondary monitoring. For lower VCC2 rails (e.g., 1.5V), the MAX6831SUT+T (V-suffix, 1.575V) or MAX6826/MAX6827 variants with user-adjustable RESET IN would be required. MAX6828SUT+T's VCC2 pin is factory-trimmed and lacks external resistor-divider capability, so threshold adjustment is not possible.
Can MAX6828SUT+T's RESET output drive a microcontroller with bidirectional reset I/O?
Yes-MAX6828SUT+T features an open-drain active-low RESET output, explicitly designed for interfacing with bidirectional reset pins like those on the Motorola 68HC11. A single external pullup resistor (typically 4.7kΩ to VCC) enables shared reset bus operation. When MAX6828SUT+T asserts RESET, it pulls the line low; when deasserted, the external pullup returns it high-allowing the µP to also drive the line during normal operation without contention. This eliminates level-shifting or isolation circuitry.
What is the watchdog timeout period for MAX6828SUT+T, and how is it cleared?
The MAX6828SUT+T watchdog timeout period is 1.6s nominal, with a specified range of 1.12s to 2.4s over –40°C to +85°C. It is cleared by any rising or falling edge on the WDI pin-or automatically by assertion of RESET or MR. If WDI remains static (high or low) beyond this interval, the watchdog triggers a reset pulse lasting ≥140ms. The internal timer stops counting while RESET is asserted and resumes only after RESET deasserts, preventing spurious timeouts during active reset states. MAX6828SUT+T requires no external capacitor or resistor to configure this function.
Is MAX6828SUT+T compatible with 1.8V-only systems?
MAX6828SUT+T supports VCC down to +1.2V, making it compatible with 1.8V systems-but only if the primary monitored rail is 3.08V (its fixed VCC threshold). It cannot supervise a 1.8V VCC rail directly. However, its VCC2 input can monitor a secondary 2.188V rail (e.g., 2.2V LDO output), and its ultra-low 7µA supply current at 3.6V enables use in 1.8V-domain systems where VCC is derived from a higher intermediate rail. For true 1.8V VCC supervision, the MAX6827SUT+T (R-suffix, 2.63V) or MAX6826 variants with adjustable RESET IN would be more appropriate. MAX6828SUT+T itself requires VCC ≥1.2V to operate.
MAX6828SUT+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- 2.93V, 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
MAX6828SUT+T FAQ
1.How can I place an order for MAX6828SUT+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6828SUT+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 MAX6828SUT+T reliable?
The price and inventory of MAX6828SUT+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6828SUT+T is usually 5 days.
3.What payment methods are accepted for MAX6828SUT+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6828SUT+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6828SUT+T?
MAX6828SUT+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6828SUT+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 MAX6828SUT+T?
For technical support, including MAX6828SUT+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6828SUT+T requirements.
6.How does Aetrix verify that MAX6828SUT+T is sourced from the original manufacturer or authorized distributors?
All MAX6828SUT+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 MAX6828SUT+T meets industry standards.
7.What is the process for return or replacement of MAX6828SUT+T?
All MAX6828SUT+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6828SUT+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 MAX6828SUT+T part is unused and in its original packaging.
Return procedure for MAX6828SUT+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX6828SUT+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…
