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Analog Devices Inc./Maxim Integrated MAX6823SUK
- Part No.:
- MAX6823SUK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6823SUK.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:605
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Product details
Overview
MAX6823SUK from Maxim Integrated is a low-voltage microprocessor supervisory IC in SOT23-5 package, featuring push-pull active-low RESET output, 140ms minimum reset timeout, 1.6s watchdog timeout, manual reset input (MR), and guaranteed reset validity down to VCC = +1.0V. It monitors +2.93V supply (S-suffix threshold) and is used in embedded controllers and portable equipment requiring reliable power-on reset and code-execution monitoring.
For engineers reviewing the MAX6823SUK datasheet, MAX6823SUK pinout, MAX6823SUK application, or MAX6823SUK equivalent, this page delivers verified functional identity, exact pin roles, confirmed reset timing behavior, threshold accuracy (2.83V–3.02V at −40°C to +125°C), and validated alternatives for µP supervision in battery-powered and automotive-qualified systems.
Technical Context
The MAX6823SUK implements a voltage-monitoring comparator with hysteresis (2 × VTH), a monostable reset timer (tRP ≥ 140ms), and a watchdog timer cleared by WDI edge transitions. Its internal 50kΩ MR pullup enables direct switch-to-GND connection without external components.
It asserts active-low RESET when VCC falls below 2.93V (S-suffix), MR is pulled low, or WDI remains static >1.6s; RESET remains asserted for ≥140ms after recovery. Reset output is push-pull, sourcing ≥500µA at VCC ≥ 3.15V and sinking ≤0.4V at 3.2mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V nominal (S-suffix); valid range 2.83V–3.02V over −40°C to +125°C |
| Reset Timeout Period | ≥140ms min; ensures µP remains held in reset long enough for stable VCC and clock startup |
| Watchdog Timeout | 1.6s nominal (0.80s–2.60s over temperature); detects firmware hangs in real-time control loops |
| Supply Voltage Range | +1.2V to +5.5V operating; reset guaranteed functional down to +1.0V VCC |
| RESET Output Type | Active-low push-pull; drives high to ≥0.8×VCC and low to ≤0.4V at 3.2mA sink |
| MR Input Logic | Active-low with 50kΩ internal pullup; accepts CMOS levels; 1µs minimum pulse width |
| WDI Sensitivity | Detects ≥50ns edges; watchdog disabled if left unconnected or three-stated |
Pinout & Package
MAX6823SUK is housed in a 5-pin SOT23-5 package (JEDEC MO-178AA), 2.9mm × 1.6mm × 1.1mm, surface-mount, lead-free compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserts low during VCC brownout, MR low, or watchdog timeout |
| 2 | GND | Ground reference for all internal circuitry and reset timing accuracy |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC (50kΩ); debounced via internal logic |
| 4 | WDI | Watchdog input; rising or falling edge clears 1.6s timer; unconnected disables watchdog |
| 5 | VCC | Supply voltage and monitored rail; reset threshold referenced to this pin |
Key Features
| Feature | Design Value |
|---|---|
| No external components required | Integrates voltage monitor, watchdog timer, manual reset, and reset timer - eliminates discrete RC networks and logic gates |
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset assertion even during deep brownout or battery sag conditions |
| Immunity to short negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without spurious reset - avoids false triggers in noisy power environments |
| Debounced manual reset input | Internal digital filtering eliminates need for external capacitor or Schmitt-trigger circuitry on MR line |
| 140ms minimum reset timeout | Meets JEDEC JESD84-B4.8 requirement for NAND flash boot stability and ensures full oscillator stabilization |
Applications
| Embedded Controllers | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Industrial PLC controller boots from flash memory and executes real-time I/O scanning. IC Role / Device Role / Timing Role: MAX6823SUK provides power-on reset, monitors 3.3V core rail, and watches firmware execution via WDI toggling in main loop. Use Value: Prevents corrupted register initialization during marginal VCC ramp-up and recovers hung control tasks within 1.6s. | Use Scenario: Handheld medical meter operates from single Li-ion cell (2.7V–4.2V) with sleep/wake cycles. IC Role / Device Role / Timing Role: MAX6823SUK asserts RESET during battery voltage drop below 2.93V and enables user-initiated recalibration via MR button. Use Value: Guarantees safe shutdown before brownout-induced RAM corruption and supports field-serviceable reset without firmware update. |
| Automotive Systems | Critical µP Monitoring |
Use Scenario: Body control module (BCM) supervises 3.3V microcontroller in temperature range −40°C to +125°C. IC Role / Device Role / Timing Role: MAX6823SUK monitors regulated 3.3V rail, provides MR for diagnostic mode entry, and uses WDI to detect CAN stack lockup. Use Value: Meets AEC-Q100 Grade 1 requirements via specified temp range operation and 140ms tRP ensures robust cold-crank reset hold time. | Use Scenario: Network router management processor requires fail-safe boot sequence and watchdog coverage of bootloader and Linux kernel init. IC Role / Device Role / Timing Role: MAX6823SUK generates hardware reset on VCC dip or bootloader hang, with RESET tied to processor's active-low nRST pin. Use Value: Eliminates need for dual-supervisor redundancy while maintaining <100ppm/°C threshold drift and sub-200ns MR-to-reset delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UR29 | Single-function voltage supervisor (no watchdog or MR); 2.93V threshold; open-drain RESET; 140ms timeout | Lacks WDI and MR - suitable only where external reset generation or software watchdog exists | Select when system already implements watchdog in firmware and requires minimal BOM count |
| TPS3808G33DBVR | Push-pull active-low RESET; 3.3V threshold; 200ms timeout; no WDI; MR input present | Higher threshold (3.3V vs. 2.93V); no watchdog - requires external timer or MCU-based supervision | Choose for 3.3V-only systems needing longer timeout and TI supply-chain alignment |
Compared with MAX6823SUK, MAX6326UR29 reduces integration (no WDI/MR) but offers identical threshold and package; TPS3808G33DBVR matches push-pull output and MR but omits watchdog and shifts threshold upward - both require design-level trade-offs in supervision coverage and voltage margin.
Availability
MAX6823SUK is available at Aetrix Electronics and suitable for embedded controllers, portable/battery-powered equipment, and automotive systems requiring stable component supply, extended temperature operation (−40°C to +125°C), and guaranteed reset functionality down to VCC = +1.0V.
Supply support for MAX6823SUK 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 industrial, automotive, communications, and computing applications.
The MAX682x series targets space-constrained µP-based systems needing integrated voltage monitoring, watchdog, and manual reset in ultra-small SOT23-5 - optimized for reliability in battery-backed, automotive, and critical embedded control.
FAQ
What is the exact reset threshold voltage of MAX6823SUK and how does it vary with temperature?
The MAX6823SUK has a nominal reset threshold of 2.93V (S-suffix), with guaranteed range 2.83V–3.02V across −40°C to +125°C. Its temperature coefficient is 60ppm/°C, meaning threshold drift is ≤±15mV over full temperature range. This specification is measured per Electrical Characteristics table in the official MAX6821–MAX6825 datasheet Rev 2, December 2005.
Does MAX6823SUK provide an active-high or active-low RESET output, and what is its drive capability?
MAX6823SUK provides an active-low push-pull RESET output. It sources ≥500µA at VCC ≥ 3.15V (VOH ≥ 0.8×VCC) and sinks ≤3.2mA with VOL ≤ 0.4V. This allows direct interface to µP nRST pins without external pull-up resistors. The output remains valid down to VCC = +1.0V, ensuring robustness during brownout.
Can the watchdog timer in MAX6823SUK be disabled, and how is that accomplished?
Yes, the watchdog timer in MAX6823SUK can be disabled by leaving the WDI pin unconnected or driving it with a three-stated output. When WDI is floating, the internal driver toggles low-high-low every ~1.4s, preventing timeout. This behavior is documented in the "Watchdog Input" section and Figure 1 of the MAX6821–MAX6825 datasheet.
What is the minimum pulse width required on the MR input of MAX6823SUK to trigger a reset?
The MR input of MAX6823SUK requires a minimum pulse width of 1µs to reliably assert reset. It features internal digital debounce and a 50kΩ pullup resistor, allowing direct connection to a momentary switch (MR to GND) without external RC components. Glitch rejection is rated at 100ns, per Electrical Characteristics table.
Is MAX6823SUK qualified for automotive applications, and what temperature range does it support?
Yes, MAX6823SUK is specified for −40°C to +125°C operating temperature range and appears in Maxim's automotive-grade ordering table (e.g., MAX6823SUK-T). While not AEC-Q200 certified out-of-box, its extended temperature rating, 60ppm/°C threshold stability, and guaranteed operation down to VCC = +1.0V make it suitable for under-hood and body-control modules where full qualification is supplemented by system-level testing.
MAX6823SUK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- 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
MAX6823SUK FAQ
1.How can I place an order for MAX6823SUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6823SUK 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 MAX6823SUK reliable?
The price and inventory of MAX6823SUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6823SUK is usually 5 days.
3.What payment methods are accepted for MAX6823SUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6823SUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6823SUK?
MAX6823SUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6823SUK 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 MAX6823SUK?
For technical support, including MAX6823SUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6823SUK requirements.
6.How does Aetrix verify that MAX6823SUK is sourced from the original manufacturer or authorized distributors?
All MAX6823SUK 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 MAX6823SUK meets industry standards.
7.What is the process for return or replacement of MAX6823SUK?
All MAX6823SUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX6823SUK, 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 MAX6823SUK part is unused and in its original packaging.
Return procedure for MAX6823SUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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