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Analog Devices Inc./Maxim Integrated MAX6858UK22D3+T
- Part No.:
- MAX6858UK22D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6858UK22D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,161
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Product details
Overview
The MAX6858UK22D3+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in a 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.235V reset threshold (suffix "22"), and 150ms minimum reset timeout (suffix "D3"). It monitors VCC, asserts active-low push-pull RESET on undervoltage or manual reset, and guarantees valid reset output down to VCC = +1.1V - ideal for battery-powered glucose monitors and portable medical devices.
For engineers reviewing the MAX6858UK22D3+T datasheet, MAX6858UK22D3+T pinout, MAX6858UK22D3+T application, or MAX6858UK22D3+T equivalent, key selection criteria include its fixed 2.235V threshold, 150ms reset timeout, absence of watchdog timer or manual reset input, and immunity to short VCC transients - critical for reliable power-on reset in low-voltage, low-power embedded systems.
Technical Context
The MAX6858UK22D3+T implements a precision voltage monitor with ±2.5% threshold accuracy over -40°C to +85°C and 0.5% hysteresis to prevent chatter during brownout recovery. Its internal reset timer ensures deterministic deassertion timing after VCC exceeds VTH, independent of external components.
Unlike variants with MR or WDI pins, the MAX6858 has internally connected (I.C.) pins 1 and 2 tied to GND for enhanced noise immunity - confirmed by its dedicated pin configuration diagram and absence of MR/WDI functionality in the Selector Guide.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Current | 170nA typical at +25°C - enables multi-year operation on coin-cell batteries without compromising reset reliability. |
| Reset Threshold | 2.235V (±2.5%) - factory-trimmed for precise monitoring of 2.2V–2.3V logic rails or LDO outputs. |
| Reset Timeout | 150ms minimum - ensures µP initialization completes before release, compatible with slow-start power supplies. |
| VCC Operating Range | 1.2V to 5.5V - supports wide-input battery systems including single Li-ion, dual alkaline, or regulated 3.3V/2.5V domains. |
| Reset Output Type | Active-low push-pull - drives RESET directly without external pullup, simplifying PCB layout and reducing BOM count. |
| Valid Reset Down To | VCC = +1.1V - guarantees clean reset assertion even during deep brownout, preventing undefined µP states. |
| Package | 5-pin SOT23 - 2.9mm × 1.6mm footprint ideal for space-constrained portable medical and wearables. |
Pinout & Package
MAX6858UK22D3+T is housed in a lead-free 5-pin SOT23 package (JEDEC MO-178AA), with pins 1 and 2 internally connected and recommended for GND connection to improve noise immunity per datasheet Figure 15 and Pin Configurations section.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | I.C. (Internally Connected) | Must be connected to GND externally to maximize noise rejection; not functional as signal pins. |
| 3 | GND | Primary ground reference for all internal comparators and reset logic; requires low-impedance connection. |
| 4 | RESET | Active-low push-pull output; sinks ≥500µA at VCC ≥ 2.38V; no external pullup required. |
| 5 | VCC | Monitored supply input; bypass with 0.1µF ceramic capacitor to GND for transient suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low ICC | 170nA typical enables >10-year shelf life in battery-backed medical sensors without periodic maintenance. |
| No external components | Eliminates need for RC timing networks or pullup resistors - reduces bill-of-materials and assembly cost. |
| Guaranteed reset validity to 1.1V | Ensures deterministic µP reset behavior during deep discharge, avoiding boot failures in energy-harvesting systems. |
| Immunity to short VCC transients | Rejects ≤40µs glitches at 100mV overdrive - prevents spurious resets in noisy automotive or industrial environments. |
| SOT23-5 footprint | Compatible with standard pick-and-place equipment and reflow profiles; supports high-volume automated assembly. |
Applications
| Portable Medical Sensors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous glucose monitoring patch operating from CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Primary VCC supervisor ensuring µP resets cleanly during battery voltage sag between sensor reads. Use Value: 170nA ICC extends operational life beyond 2 years; 2.235V threshold precisely matches LDO output feeding the analog front-end. |
Use Scenario: Environmental data logger powered by two AA alkaline cells, sampling temperature/humidity every 5 minutes. IC Role / Device Role / Timing Role: Power-on reset generator that holds µP in reset until regulated 3.3V rail stabilizes post-brownout. Use Value: 150ms timeout accommodates slow-start DC-DC converter; 1.1V valid reset prevents erratic startup during end-of-life battery discharge. |
| Wearable Health Trackers | Low-Power IoT End Nodes |
Use Scenario: Heart-rate monitor worn continuously, using motion-triggered wake-up and sleep-mode optimization. IC Role / Device Role / Timing Role: Brownout detector asserting RESET when battery drops below safe operating voltage during peak current draw. Use Value: ±2.5% threshold tolerance ensures consistent trip point across temperature; push-pull output eliminates pullup resistor area. |
Use Scenario: Soil moisture sensor node powered by solar harvester, transmitting via LoRaWAN only when threshold exceeded. IC Role / Device Role / Timing Role: System-level reset controller guaranteeing known state after energy storage capacitor recharge cycles. Use Value: Immunity to <40µs transients prevents false resets during capacitor charging spikes; SOT23 size fits compact outdoor enclosure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6854UK22D3+T | Includes active-low manual reset (MR) input; identical 2.235V threshold and 150ms timeout. | Required where operator-initiated reset or test-mode entry is needed. | Select MAX6854UK22D3+T if system design mandates hardware reset button or automated test reset capability. |
| TPS3836K22DBVR | 2.2V threshold (±0.5%), 200ms timeout, 1.5µA ICC - higher quiescent current but tighter threshold tolerance. | Better suited for precision 2.2V rail monitoring where absolute accuracy outweighs battery life. | Choose TPS3836K22DBVR when ±0.5% threshold stability is mandatory and supply current >1µA is acceptable. |
Compared with MAX6858UK22D3+T, MAX6854UK22D3+T adds MR functionality at identical power and timing specs, while TPS3836K22DBVR trades 10× higher ICC for superior threshold accuracy - guiding selection based on whether reset flexibility or voltage precision dominates the design requirement.
Availability
MAX6858UK22D3+T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered data loggers, wearable health trackers, and low-power IoT end nodes requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6858UK22D3+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 management, sensing, and interface applications in industrial, medical, and communications markets.
The MAX6858UK22D3+T belongs to the nanopower µP supervisory family engineered specifically for ultra-low-power battery-operated systems where reset reliability must coexist with multi-year operating life.
FAQ
What is the exact reset threshold voltage of the MAX6858UK22D3+T?
The MAX6858UK22D3+T has a factory-trimmed reset threshold of 2.235V, with ±2.5% tolerance over -40°C to +85°C. This value is confirmed by the "22" suffix in the part number per Table 2 (Threshold Suffix Guide) and electrical characteristics table, where VTH = 2.235V (typ) at VCC = 2.5V and TA = +25°C.
Does the MAX6858UK22D3+T include a manual reset input or watchdog timer?
No, the MAX6858UK22D3+T does not include MR or WDI functionality. Per the Selector Guide and Pin Configurations diagram, MAX6858 uses pins 1 and 2 as I.C. (internally connected) and lacks MR/WDI terminals - distinguishing it from MAX6854/MAX6864 variants. Its sole functions are VCC monitoring and reset generation.
What is the function of pins 1 and 2 on the MAX6858UK22D3+T?
Pins 1 and 2 of the MAX6858UK22D3+T are labeled "I.C." (Internally Connected) and must be externally connected to GND per the datasheet's Pin Configurations section and Applications Information. This connection enhances noise immunity and is required for proper operation - they are not signal pins and carry no active circuit function.
What reset output type does the MAX6858UK22D3+T provide?
The MAX6858UK22D3+T provides an active-low push-pull RESET output (pin 4), as confirmed by the MAX6858/MAX6860 Pin Description table and Selector Guide. This eliminates the need for an external pullup resistor and ensures robust drive capability: VOL ≤ 0.3V at ISINK = 1.2mA when VCC ≥ 2.38V.
Is the MAX6858UK22D3+T compatible with 1.8V supply rails?
Yes, the MAX6858UK22D3+T operates from VCC = 1.2V to 5.5V and guarantees valid reset output down to VCC = +1.1V. Its 2.235V threshold is fully functional at 1.8V supply, with supply current dropping to 170nA (typ) at VCC = 1.8V - making it suitable for modern low-voltage µP systems.
MAX6858UK22D3+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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.188V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6858UK22D3+T FAQ
1.How can I place an order for MAX6858UK22D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6858UK22D3+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 MAX6858UK22D3+T reliable?
The price and inventory of MAX6858UK22D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6858UK22D3+T is usually 5 days.
3.What payment methods are accepted for MAX6858UK22D3+T?
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4.How is shipping managed for MAX6858UK22D3+T?
MAX6858UK22D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6858UK22D3+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 MAX6858UK22D3+T?
For technical support, including MAX6858UK22D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6858UK22D3+T requirements.
6.How does Aetrix verify that MAX6858UK22D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6858UK22D3+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 MAX6858UK22D3+T meets industry standards.
7.What is the process for return or replacement of MAX6858UK22D3+T?
All MAX6858UK22D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6858UK22D3+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 MAX6858UK22D3+T part is unused and in its original packaging.
Return procedure for MAX6858UK22D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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