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Analog Devices Inc./Maxim Integrated MAX6825RUK+
- Part No.:
- MAX6825RUK+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6825RUK+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,641
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Product details
Overview
MAX6825RUK+ from Maxim Integrated is a low-voltage microprocessor supervisory circuit in a 5-pin SOT23 package, combining voltage monitoring (2.63V threshold), manual reset input, and dual push-pull reset outputs (RESET and RESET). It asserts reset during VCC brownout, power-up, or manual trigger, with 140ms minimum timeout and guaranteed operation down to VCC = +1.0V. Used in embedded controllers and portable equipment for reliable µP initialization.
For engineers reviewing the MAX6825RUK+ datasheet, MAX6825RUK+ pinout, MAX6825RUK+ application, or MAX6825RUK+ equivalent, key selection factors include its 2.63V reset threshold, dual active-high/active-low push-pull outputs, manual reset capability, and watchdog-free architecture-critical for deterministic reset control in battery-powered and industrial µP systems.
Technical Context
The MAX6825RUK+ implements a precision bandgap-based voltage monitor with ±1.5% threshold accuracy over –40°C to +125°C and 60ppm/°C temperature coefficient. Its dual push-pull reset outputs operate independently: RESET goes high upon VCC recovery or MR release, while RESET goes low under identical conditions-enabling simultaneous control of complementary reset logic paths without external inverters.
No watchdog timer is integrated; unlike MAX6821–MAX6824, the MAX6825RUK+ omits WDI functionality entirely, simplifying firmware design and eliminating watchdog-related current draw (up to 160µA) and timing dependencies. MR features internal 50kΩ pullup and 100ns glitch rejection, supporting direct switch-to-GND connection with no external debounce.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63V ±1.5% - precisely matches 2.6V–2.7V supply rails in modern µPs and FPGAs. |
| Reset Timeout Period | 140ms (min) - ensures full µP core and peripheral stabilization before release. |
| VCC Operating Range | +1.2V to +5.5V - supports 1.8V, 2.5V, 3.3V, and 5.0V systems with valid reset assertion down to +1.0V. |
| Supply Current | 5µA (typ at +1.8V, –40°C to +85°C) - enables multi-year battery life in portable instrumentation. |
| MR Input Logic | Active-low, 0.3×VCC VIH/0.3×VCC VIL - compatible with CMOS, open-drain, and 3.3V/1.8V I/O domains. |
| Output Drive | Push-pull RESET (VOH = 0.8×VCC, VOL = 0.3V) and RESET (VOH = 0.8×VCC, VOL = 0.3V) - eliminates external pullups and supports >1.2mA sink/source. |
| Temperature Range | –40°C to +125°C - qualified for automotive under-hood and industrial motor-control environments. |
Pinout & Package
Package: 5-pin SOT23-5 (U5-1 outline, 21-0057 land pattern), RoHS-compliant, surface-mountable with 0.95mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-high push-pull reset output - drives high during normal operation; pulled low only during reset assertion. |
| 2 | GND | Ground reference for all internal circuits and output drivers - must be low-impedance connection to system ground plane. |
| 3 | MR | Active-low manual reset input - internally pulled up to VCC (50kΩ); assert by shorting to GND; 1µs minimum pulse width required. |
| 4 | RESET | Active-low push-pull reset output - drives low during reset; high-impedance state never occurs; complements RESET for dual-signaling interfaces. |
| 5 | VCC | Supply and monitored voltage input - powers device and provides reference for threshold detection; accepts 1.2V–5.5V with full spec compliance. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals eliminate need for external level-shifting or inversion in mixed-logic systems. |
| Guaranteed reset validity to VCC = +1.0V | Ensures deterministic reset behavior during deep brownout or ultra-low-power wake-up sequences where VCC dips below 1.2V. |
| No external components required | Integrates precision voltage reference, timing capacitor, pullup resistor, and output drivers - reduces BOM count and PCB area vs. discrete solutions. |
| Immunity to negative VCC transients | Withstands ≤20µs, 100mV VCC glitches without spurious reset - avoids false triggers in noisy power environments like motor drives or switching supplies. |
| Lead(Pb)-free and leaded packaging options | RoHS-compliant "+" suffix (MAX6825RUK+) and legacy "-T" suffix available - supports both new designs and legacy manufacturing transitions. |
Applications
| Embedded Controllers | Portable/Battery-Powered Equipment |
|---|---|
Use Scenario: Industrial PLC modules requiring fail-safe boot sequencing after power interruption or firmware update. IC Role / Device Role / Timing Role: Voltage supervisor enforcing strict power-on reset timing and enabling operator-initiated recovery via front-panel button. Use Value: Dual RESET/RESET outputs directly drive FPGA configuration enable and µP nRST pins without glue logic, reducing startup latency by 120ns vs. inverter-based solutions. | Use Scenario: Handheld test meters operating on single-cell Li-ion batteries with dynamic voltage sag during measurement bursts. IC Role / Device Role / Timing Role: Brownout detector maintaining reset assertion until VCC recovers above 2.63V and sustains for ≥140ms, preventing corrupted ADC readings. Use Value: Valid reset down to VCC = +1.0V allows safe shutdown and memory retention even as battery discharges to 2.5V nominal, extending usable runtime by 18%. |
| Set-Top Boxes | Critical µP Monitoring |
Use Scenario: Consumer STB platforms with multi-rail power (3.3V, 1.8V, 1.2V) and HDMI hot-plug detection logic. IC Role / Device Role / Timing Role: Primary supervisor for 3.3V domain, coordinating reset release with secondary supervisors on lower rails via daisy-chained reset propagation. Use Value: 140ms timeout aligns with HDMI controller's 100ms power-stabilization requirement, eliminating video artifacts during cold boot. | Use Scenario: Medical infusion pump controller where unintended reset could cause therapy interruption. IC Role / Device Role / Timing Role: Safety-critical reset manager with manual override for service mode and immunity to EFT-induced VCC dips. Use Value: 100ns MR glitch rejection prevents accidental reset from ESD events on front-panel buttons, meeting IEC 60601-1 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6823RUK+ | Same 2.63V threshold, manual reset, and SOT23-5 package; includes watchdog timer (WDI pin) and single push-pull RESET output. | Supports code-execution monitoring in firmware-rich systems; adds 120µA typical WDI current and 1.6s timeout dependency. | Select MAX6823RUK+ only if watchdog supervision is required; MAX6825RUK+ avoids WDI routing and firmware overhead. |
| TPS3808G26DBVR | 2.63V threshold, push-pull RESET, no manual reset input; requires external pullup on MR-equivalent pin; 200ms timeout. | Lacks native MR function - demands external switch + RC network or GPIO-driven reset, increasing component count and board space. | Choose TPS3808G26DBVR for cost-sensitive, non-manual-reset applications; MAX6825RUK+ integrates MR with internal pullup and no external parts. |
Compared with MAX6823RUK+, the MAX6825RUK+ removes watchdog complexity and saves 120µA standby current; versus TPS3808G26DBVR, it delivers true hardware-managed manual reset without external components-making it optimal for compact, deterministic, and serviceable embedded designs.
Availability
MAX6825RUK+ is available at Aetrix Electronics and suitable for embedded controllers, portable/battery-powered equipment, and critical µP monitoring applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.
Supply support for MAX6825RUK+ 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 markets.
The MAX682x family targets space-constrained µP-based systems needing reliable, low-quiescent-power voltage supervision with flexible reset signaling-specifically addressing brownout resilience, manual recovery, and multi-rail coordination in harsh environments.
FAQ
What is the exact reset threshold voltage of the MAX6825RUK+?
The MAX6825RUK+ has a factory-trimmed reset threshold of 2.63V, with ±1.5% accuracy over –40°C to +125°C and a 60ppm/°C temperature coefficient. This value is confirmed in the Threshold Suffix Guide (suffix "R") and Electrical Characteristics table under VTH for MAX682_R, with min/typ/max values of 2.53V/2.63V/2.72V at full temperature range.
Does the MAX6825RUK+ include a watchdog timer?
No, the MAX6825RUK+ does not include a watchdog timer. Unlike MAX6821–MAX6824 variants, the MAX6825RUK+ omits the WDI pin and associated watchdog circuitry entirely. Its Selector Guide entry explicitly lists "-" under WATCHDOG INPUT, confirming this is a deliberate functional distinction-not a missing feature.
What are the functions of the two reset outputs on the MAX6825RUK+?
The MAX6825RUK+ provides two independent push-pull reset outputs: RESET (active-high) and RESET (active-low). When reset is asserted, RESET drives low and RESET drives high; when released, RESET goes high and RESET goes low. This dual-signal capability enables direct interface to µPs or FPGAs requiring complementary reset inputs without external inverters or pull resistors.
Can the MAX6825RUK+ operate reliably at VCC = +1.1V?
Yes, the MAX6825RUK+ guarantees correct reset output states down to VCC = +1.0V, as stated in the General Description and Electrical Characteristics. At +1.1V, both RESET and RESET outputs remain fully functional with specified VOH (0.8×VCC) and VOL (0.3V), and the internal voltage monitor continues asserting reset if VCC falls below 2.63V-even during ultra-low-power wake-up sequences.
Is the manual reset input (MR) on the MAX6825RUK+ debounced internally?
Yes, the MR input on the MAX6825RUK+ includes internal hardware debounce: it rejects glitches ≤100ns and requires a minimum 1µs pulse width for recognition. The internal 50kΩ pullup resistor eliminates need for external components, and MR can be driven directly by a momentary switch to GND-no external RC network or firmware polling is required.
MAX6825RUK+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High/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
MAX6825RUK+ FAQ
1.How can I place an order for MAX6825RUK+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6825RUK+ 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 MAX6825RUK+ reliable?
The price and inventory of MAX6825RUK+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6825RUK+ is usually 5 days.
3.What payment methods are accepted for MAX6825RUK+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6825RUK+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6825RUK+?
MAX6825RUK+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6825RUK+ 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 MAX6825RUK+?
For technical support, including MAX6825RUK+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6825RUK+ requirements.
6.How does Aetrix verify that MAX6825RUK+ is sourced from the original manufacturer or authorized distributors?
All MAX6825RUK+ 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 MAX6825RUK+ meets industry standards.
7.What is the process for return or replacement of MAX6825RUK+?
All MAX6825RUK+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6825RUK+, 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 MAX6825RUK+ part is unused and in its original packaging.
Return procedure for MAX6825RUK+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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