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Analog Devices Inc./Maxim Integrated MAX6858UK29D3+T
- Part No.:
- MAX6858UK29D3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6858UK29D3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,885
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Product details
Overview
The MAX6858UK29D3+T from Maxim Integrated is a nanopower microprocessor supervisory circuit in 5-pin SOT23 package, featuring ultra-low 170nA typical supply current, factory-trimmed 2.925V reset threshold, and 150ms minimum reset timeout period. 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 MAX6858UK29D3+T datasheet, MAX6858UK29D3+T pinout, MAX6858UK29D3+T application, or MAX6858UK29D3+T equivalent, key selection criteria include its fixed 2.925V threshold, absence of watchdog timer or manual reset input, immunity to short VCC transients, and compatibility with low-voltage µP systems requiring guaranteed reset assertion below 1.2V.
Technical Context
The MAX6858UK29D3+T implements a precision voltage monitor with ±2.5% threshold accuracy over -40°C to +85°C and hysteresis of 0.5% of VTH. Its internal reset timeout generator provides deterministic 150ms (min) / 225ms (typ) / 300ms (max) delay after VCC recovery before RESET deassertion.
No MR or WDI pins are present - the device operates as a dedicated VCC supervisor only. Pin 1 and 2 are internally connected (I.C.) for enhanced noise immunity and must be tied to GND per datasheet guidance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.925V (factory-trimmed, ±2.5% tolerance) - ensures reliable brownout detection at nominal 3.0V rail |
| Supply Current | 170nA (typ) at +25°C - enables multi-year operation on coin-cell batteries |
| Reset Timeout Period | 150ms (min), 225ms (typ), 300ms (max) - provides sufficient hold time for µP power-up sequencing |
| VCC Operating Range | 1.2V to 5.5V - supports wide-input battery and low-voltage logic domains |
| Valid Reset Down to VCC | +1.1V - guarantees functional reset assertion even during deep brownout conditions |
| Output Type | Push-pull active-low RESET - eliminates need for external pullup and drives directly into CMOS inputs |
| Package | 5-pin SOT23 - surface-mount footprint compatible with high-density portable PCB layouts |
Pinout & Package
MAX6858UK29D3+T uses a 5-pin SOT23 package with pins 1 and 2 internally connected (I.C.). Per datasheet Pin Configurations (page 15), both I.C. pins must be externally connected to GND to ensure noise immunity and proper operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | I.C. (Internally Connected) | Must be tied to GND externally - improves noise rejection and stabilizes internal biasing |
| 3 | GND | Ground reference for all internal circuitry and reset output sink path |
| 4 | RESET | Active-low push-pull output - drives low during reset; no external pullup required |
| 5 | VCC | Supply input and monitored voltage rail - requires 0.1µF bypass capacitor to GND |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low supply current | 170nA typical - extends battery life in always-on wearable and implantable sensors |
| Guaranteed reset validity to 1.1V | Ensures deterministic system reset even during severe supply sag below logic thresholds |
| Immunity to short VCC transients | Rejects <40µs glitches at 100mV overdrive - prevents spurious resets in noisy environments |
| No external components required | Self-contained supervision - eliminates BOM cost and layout area for RC timing networks |
| Factory-trimmed precision threshold | 2.925V ±2.5% - removes calibration step and improves batch consistency in production |
Applications
| Glucose Monitoring Systems | Patient Vital Sign Monitors |
|---|---|
Use Scenario: Continuous glucose sensing in handheld or wearable devices powered by CR2032 coin cells. IC Role / Device Role / Timing Role: VCC supervisor ensuring µP reset during battery voltage decay below 3.0V nominal. Use Value: 170nA quiescent current enables >5-year shelf life; 150ms timeout accommodates slow analog sensor startup. |
Use Scenario: Portable ECG or SpO₂ units operating from single-cell Li-ion with variable discharge profile. IC Role / Device Role / Timing Role: Brownout detector asserting RESET when cell voltage drops below 2.925V during deep discharge. Use Value: Valid reset down to 1.1V prevents undefined µP state during final battery depletion phase. |
| Low-Power Wearable Sensors | Industrial Handheld Terminals |
Use Scenario: Bluetooth LE temperature/humidity tags powered by alkaline AA batteries. IC Role / Device Role / Timing Role: Power-on reset generator with precise 2.925V threshold matching MCU VDD min spec. Use Value: ±2.5% threshold tolerance avoids false resets during temperature-induced VCC drift. |
Use Scenario: Ruggedized barcode scanners using 3.3V logic rails with intermittent high-current motor loads. IC Role / Device Role / Timing Role: Immune supervisor rejecting <40µs supply transients induced by motor commutation noise. Use Value: Eliminates need for additional LC filtering on 3.3V rail - reduces board space and cost. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS3836K33DBVR | 3.08V fixed threshold, 200ms timeout, 1.2µA ICC - higher current, tighter threshold tolerance (±0.5%) | Requires higher supply current budget; better suited for industrial systems with stable 3.3V rails | Select when absolute threshold accuracy > stability under load transient matters more than battery life |
| ADM6806-30ARTZ-R7 | 3.00V threshold, 200ms timeout, 1.5µA ICC, open-drain output - lacks push-pull drive and 1.1V validity guarantee | Needs external pullup; not suitable for systems requiring guaranteed reset below 1.2V | Choose only if open-drain flexibility and lower cost outweigh nanopower and deep-brownout requirements |
Compared with TPS3836K33DBVR and ADM6806-30ARTZ-R7, the MAX6858UK29D3+T uniquely delivers sub-200nA operation with reset validity down to 1.1V - making it irreplaceable in multi-year battery-powered medical and wearable designs where µP reliability at end-of-battery-life is non-negotiable.
Availability
MAX6858UK29D3+T is available at Aetrix Electronics and suitable for glucose monitors, patient vital sign equipment, low-power wearables, and industrial handheld terminals requiring stable component supply across extended product lifecycles.
Supply support for MAX6858UK29D3+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 demanding environments.
The MAX6854–MAX6869 family was engineered specifically for nanopower microprocessor supervision in battery-critical medical, portable, and IoT edge devices - prioritizing ultra-low ICC, deep-brownout robustness, and minimal external component count.
FAQ
What is the exact reset threshold voltage of the MAX6858UK29D3+T?
The MAX6858UK29D3+T has a factory-trimmed reset threshold voltage of 2.925V, with guaranteed tolerance of ±2.5% over the full -40°C to +85°C operating temperature range. This value is confirmed in Table 2 (Threshold Suffix Guide) of the datasheet, where suffix "29" corresponds to 2.925V nominal. The MAX6858UK29D3+T does not include manual reset or watchdog functionality - its sole role is precise VCC monitoring.
Does the MAX6858UK29D3+T include a manual reset input (MR) or watchdog timer (WDI)?
No, the MAX6858UK29D3+T does not include MR or WDI pins. As shown in the Selector Guide (page 16) and Pin Configurations (page 15), MAX6858 variants have only VCC, GND, RESET, and two internally connected (I.C.) pins - no MR or WDI terminals. This distinguishes it from MAX6864–MAX6869 (with WDI) and MAX6854/MAX6856 (with MR). The MAX6858UK29D3+T is a dedicated VCC supervisor only.
What is the function of pins 1 and 2 on the MAX6858UK29D3+T?
Pins 1 and 2 of the MAX6858UK29D3+T are internally connected (I.C.) - a design feature to improve noise immunity. The datasheet explicitly states (page 7 and page 15) that both pins must be externally connected to GND. Leaving them floating or unconnected violates the recommended operating condition and may degrade transient immunity or cause erratic reset behavior. This is a mandatory layout requirement, not optional.
What is the reset timeout period for the MAX6858UK29D3+T, and how is it set?
The MAX6858UK29D3+T has a fixed reset timeout period of 150ms (minimum), 225ms (typical), and 300ms (maximum), as defined by suffix "D3" in the part number (Table 4, Reset Timeout Periods). Unlike MAX6861–MAX6863, this device has no CT pin or programmability - the timeout is factory-set and immutable. The internal timer begins counting only after VCC rises above the 2.925V threshold and continues for the full D3 interval before RESET deassertion.
Can the MAX6858UK29D3+T operate reliably below 1.2V supply voltage?
Yes - the MAX6858UK29D3+T guarantees valid reset output down to VCC = +1.1V, as specified in the Electrical Characteristics table (page 2) and Detailed Description (page 11). While the device requires ≥1.2V for normal operation, its RESET output remains functional and asserted during brownout down to 1.1V. This ensures µP reset integrity even during final battery depletion, a critical requirement for medical devices where undefined states are unacceptable. The MAX6858UK29D3+T is explicitly characterized and warranted for this behavior.
MAX6858UK29D3+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:
- 2.925V
- 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
MAX6858UK29D3+T FAQ
1.How can I place an order for MAX6858UK29D3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6858UK29D3+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 MAX6858UK29D3+T reliable?
The price and inventory of MAX6858UK29D3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6858UK29D3+T is usually 5 days.
3.What payment methods are accepted for MAX6858UK29D3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6858UK29D3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6858UK29D3+T?
MAX6858UK29D3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6858UK29D3+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 MAX6858UK29D3+T?
For technical support, including MAX6858UK29D3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6858UK29D3+T requirements.
6.How does Aetrix verify that MAX6858UK29D3+T is sourced from the original manufacturer or authorized distributors?
All MAX6858UK29D3+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 MAX6858UK29D3+T meets industry standards.
7.What is the process for return or replacement of MAX6858UK29D3+T?
All MAX6858UK29D3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6858UK29D3+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 MAX6858UK29D3+T part is unused and in its original packaging.
Return procedure for MAX6858UK29D3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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