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Analog Devices Inc./Maxim Integrated MAX6822SUK+T
- Part No.:
- MAX6822SUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6822SUK+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,867
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Product details
Overview
MAX6822SUK+T from Maxim Integrated is a low-voltage microprocessor supervisory IC in 5-pin SOT23 package, featuring open-drain active-low RESET output, 3.08V reset threshold (suffix 'S'), 140ms minimum reset timeout, and 1.6s watchdog timer. It monitors VCC for brownout detection, supports manual reset via MR pin, and operates reliably down to VCC = +1.0V - used in set-top boxes, embedded controllers, and portable battery-powered equipment.
For engineers reviewing the MAX6822SUK+T datasheet, MAX6822SUK+T pinout, MAX6822SUK+T application, or MAX6822SUK+T equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset/wdog timing, true supply voltage range (1.2V–5.5V), and validated alternative options for µP supervision in industrial and portable systems.
Technical Context
The MAX6822SUK+T implements a precision bandgap-based voltage monitor with 60ppm/°C temperature coefficient and 2×VTH hysteresis, ensuring stable reset assertion across -40°C to +125°C. Its internal watchdog timer detects µP code stalls by monitoring WDI edge transitions, clearing on any rising/falling edge and timing out after 1.12–2.40s depending on temperature.
Reset generation uses a dedicated analog comparator and digital timeout counter; the open-drain RESET output requires an external pullup and interfaces directly with bidirectional µP reset pins (e.g., Motorola 68HC11). MR input includes a 50kΩ internal pullup and rejects <100ns glitches, enabling robust manual reset without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (±3%, -40°C to +125°C) - precisely matches 3.0V system rails with margin for tolerance and drift |
| Reset Timeout Period | 140ms min - ensures µP completes power-up initialization before release |
| Watchdog Timeout | 1.6s nominal (1.12–2.40s over temp) - balances fault detection speed vs. false triggers during long ISR execution |
| Supply Voltage Range | +1.2V to +5.5V - supports operation during deep brownout and across 1.8V/2.5V/3.3V/5V logic domains |
| RESET Output Type | Open-drain active-low - enables wired-OR reset bus and direct interface to bidirectional µP reset I/O |
| MR Input Logic | Active-low with 50kΩ internal pullup - eliminates need for external resistor; accepts CMOS or open-drain drive |
| WDI Sensitivity | Detects ≥50ns pulses - tolerates fast µP GPIO toggling without missing watchdog refresh |
Pinout & Package
Package: 5-pin SOT23-5 (U5-1 outline, 21-0057 land pattern), footprint-compatible with industry-standard 5-lead SOT-23 devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (open-drain) | Active-low reset signal output; requires external pullup; sinks 50µA at VCC ≥1.0V |
| 2 | GND | Ground reference for all internal circuits and voltage monitoring |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC; asserts reset when low |
| 4 | WDI | Watchdog input; edge-sensitive; clears internal 1.6s timer on rising or falling transition |
| 5 | VCC | Supply input and monitored voltage rail; reset asserted when VCC falls below 2.93V |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset validity to VCC = +1.0V | Ensures reliable reset assertion even during severe brownout conditions where other supervisors fail |
| No external components required | Integrates voltage reference, comparator, timer, pullup resistor, and glitch filter - reduces BOM count and PCB area |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without spurious reset - avoids unnecessary system restarts |
| Debounced manual reset input | Internal 100ns glitch rejection and 200ns MR-to-reset delay eliminate need for external RC debounce |
| 1.6s watchdog timeout with edge-triggered clear | Prevents software lockup by requiring periodic WDI toggling - not just level-hold, improving fault coverage |
Applications
| Set-Top Boxes | Embedded Controllers |
|---|---|
Use Scenario: Power sequencing and firmware recovery during AC dropout or hot-swap events. IC Role / Device Role / Timing Role: Supervises main 3.3V SoC supply and asserts open-drain RESET to hold processor in reset until stable. Use Value: Prevents corrupted bootloaders and HDMI handshake failures by guaranteeing 140ms minimum reset hold time post-brownout. | Use Scenario: Industrial PLC modules requiring deterministic restart after watchdog timeout due to communication stack hang. IC Role / Device Role / Timing Role: Monitors 2.5V FPGA configuration rail and feeds WDI from FPGA GPIO; triggers reset on missed toggle. Use Value: Enables autonomous recovery without operator intervention, leveraging 1.6s timeout aligned with Modbus RTU frame timing. |
| Portable/Battery-Powered Equipment | Critical µP Monitoring |
Use Scenario: Wearable medical sensor with coin-cell battery experiencing gradual voltage sag. IC Role / Device Role / Timing Role: Tracks 1.8V LDO output using 1.67V threshold variant (MAX6822WUK+T); asserts RESET before ADC reference collapse. Use Value: Preserves data integrity by initiating graceful shutdown at 1.67V - 130mV above minimum µP operating voltage. | Use Scenario: Automotive body control module where µP must never execute undefined code during ignition cycling. IC Role / Device Role / Timing Role: Dual-supervision: MAX6822SUK+T monitors 5V MCU supply while separate supervisor watches 3.3V CAN transceiver rail. Use Value: Provides independent reset sources - prevents single-point failure from compromising safety-critical functions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR29+T | Fixed 2.93V threshold, no watchdog, push-pull RESET, 140ms timeout, same SOT23-5 package | Lacks WDI functionality; suitable only where software-level watchdog is handled externally | Select when system already implements watchdog in firmware and only voltage monitoring + reset is needed |
| TPS3808G33DBVR | 3.3V threshold, 200ms timeout, open-drain RESET, no manual reset input, 1.5µA quiescent current | Higher threshold and longer timeout; MR pin omitted - requires external button circuit if manual reset needed | Choose for ultra-low-power 3.3V systems where MR is unused and extended reset hold improves noise immunity |
Compared with MAX6822SUK+T, MAX6326UR29+T removes watchdog capability but simplifies design for basic reset-only use cases, while TPS3808G33DBVR trades manual reset and watchdog for lower ICC and tighter threshold accuracy - both require layout review due to differing pinouts and absence of MR/WDI terminals.
Availability
MAX6822SUK+T is available at Aetrix Electronics and suitable for set-top boxes, embedded controllers, and portable/battery-powered equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6822SUK+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 high-reliability ICs for industrial, automotive, and computing applications.
The MAX682x family targets cost-sensitive, space-constrained µP-based systems needing integrated voltage monitoring, watchdog, and manual reset - optimized for reliability in portable, embedded, and instrumentation equipment.
FAQ
What is the exact reset threshold voltage for MAX6822SUK+T and how is it specified over temperature?
The MAX6822SUK+T has a nominal reset threshold of 2.93V, with guaranteed range of 2.83V to 3.02V over -40°C to +125°C. This is defined as the VCC voltage at which the RESET output asserts low during falling VCC, with 2×VTH hysteresis (≈5.86mV) preventing chatter near threshold. The 60ppm/°C temperature coefficient ensures minimal drift across full industrial temperature range - critical for systems operating in uncontrolled environments where thermal stability affects boot reliability.
Does MAX6822SUK+T require external components to operate, and what happens if the MR pin is left unconnected?
No, MAX6822SUK+T requires zero external components: it integrates a precision voltage reference, comparator, reset timer, 50kΩ MR pullup resistor, and glitch filter. If MR is left unconnected, the internal pullup holds it at VCC, disabling manual reset - the device functions normally for power-on reset and watchdog supervision. This simplifies design for applications where physical reset buttons are unnecessary, reducing BOM cost and PCB footprint without sacrificing core supervision functionality.
How does the watchdog timer in MAX6822SUK+T differ from simple timeout-based watchdogs, and what is the minimum WDI pulse width it accepts?
The MAX6822SUK+T watchdog clears on *any* edge (rising or falling) at WDI - not just level transitions - making it immune to stuck-at-high/low faults. It accepts pulses as narrow as 50ns, enabling use with fast µP GPIOs without additional pulse-stretching circuitry. Unlike basic timers that reset only on level change, this edge-triggered behavior ensures detection of software hangs even when WDI is toggled rapidly within tight loops, significantly improving fault coverage for safety-critical embedded code.
Can MAX6822SUK+T be used with microcontrollers that have bidirectional reset pins, and what external component is needed?
Yes, MAX6822SUK+T's open-drain RESET output is specifically designed for bidirectional µP reset pins (e.g., Motorola 68HC11). Only a single external pullup resistor (typically 10kΩ to VCC) is required - connecting RESET directly to the µP's reset pin allows either device to assert reset. This eliminates level-shifting or OR-ing logic, simplifying interface design while maintaining full reset arbitration capability between supervisor and µP - essential for systems where firmware may also initiate controlled restarts.
What is the minimum VCC voltage at which MAX6822SUK+T guarantees correct RESET output state, and why is this important?
MAX6822SUK+T guarantees valid RESET output down to VCC = +1.0V - meaning it continues asserting reset correctly even as supply collapses far below typical µP operating voltage (e.g., 1.8V). This is critical for preventing "runaway" behavior during deep brownout: while the µP may become unstable or execute random instructions below 1.2V, MAX6822SUK+T holds it in reset until VCC recovers sufficiently, ensuring deterministic power-down and eliminating corrupted memory writes or peripheral misconfiguration.
MAX6822SUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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-23-5
MAX6822SUK+T FAQ
1.How can I place an order for MAX6822SUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6822SUK+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 MAX6822SUK+T reliable?
The price and inventory of MAX6822SUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6822SUK+T is usually 5 days.
3.What payment methods are accepted for MAX6822SUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6822SUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6822SUK+T?
MAX6822SUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6822SUK+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 MAX6822SUK+T?
For technical support, including MAX6822SUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6822SUK+T requirements.
6.How does Aetrix verify that MAX6822SUK+T is sourced from the original manufacturer or authorized distributors?
All MAX6822SUK+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 MAX6822SUK+T meets industry standards.
7.What is the process for return or replacement of MAX6822SUK+T?
All MAX6822SUK+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6822SUK+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 MAX6822SUK+T part is unused and in its original packaging.
Return procedure for MAX6822SUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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