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Analog Devices Inc./Maxim Integrated MAX6844UKD3+
- Part No.:
- MAX6844UKD3+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6844UKD3+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,832
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Product details
Overview
The MAX6844UKD3+ from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit with adjustable reset threshold and active-high push-pull RESET output, designed for monitoring 0.75V–1.8V power supplies in portable and battery-powered systems. It features a 210ms reset timeout (typ), ±2.5% threshold accuracy over temperature, 5.7µA supply current (typ at VCC = 0.9V), and guaranteed reset validity down to VCC = 0.55V. It is used in critical µP power monitoring where precise brownout detection and low-power operation are required.
For engineers reviewing the MAX6844UKD3+ datasheet, MAX6844UKD3+ pinout, MAX6844UKD3+ application, or MAX6844UKD3+ equivalent, this page provides verified functional identity, confirmed SOT23-5 pin mapping, exact timeout and threshold specifications per suffix D3, output configuration details, and validated alternative options for voltage-monitoring reset ICs in ultra-low-VCC systems.
Technical Context
The MAX6844UKD3+ implements an adjustable reset comparator referenced to VCC, with internal 187.4mV threshold at RESET IN pin - enabling external resistive-divider programming of VCC trip points from 0.765V to 1.425V. Its reset assertion logic responds to either falling RESET IN voltage or active-low MR input, with fixed 210ms (typ) timeout after recovery.
It uses BiCMOS process technology (788 transistors), supports manual reset with internal 20kΩ pullup on MR, and guarantees valid active-high push-pull RESET output down to VCC = 0.55V. The device rejects fast VCC transients (<150ns glitch immunity) and operates across –40°C to +85°C without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Timeout Period | 210ms typical - ensures µP remains held in reset long enough for stable power-up sequencing after brownout recovery. |
| RESET IN Threshold | 187.4mV (referenced to VCC) - sets precise, temperature-stable trip point for external resistor-divider networks. |
| Supply Current | 5.7µA typical at VCC = 0.9V - enables multi-year battery life in always-on portable monitoring applications. |
| Reset Threshold Accuracy | ±2.5% over –40°C to +85°C - eliminates need for field calibration in industrial and telecom base station environments. |
| VCC Operating Range | 0.75V to 1.8V - supports modern sub-1V core supplies in ASICs, FPGAs, and ultra-low-power MCUs. |
| MR Input Glitch Rejection | 150ns - prevents spurious resets from EMI or PCB noise coupling onto manual reset lines. |
| RESET Output Type | Active-high push-pull - drives µP reset pin directly without external pullup, simplifying layout and reducing BOM count. |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (indicated by '+' suffix), footprint compatible with JEDEC MO-178AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal comparators and output stage; must be low-impedance connection to system ground plane. |
| 2 | RESET | Active-high push-pull reset output - asserts high during reset condition; sinks/source up to 80µA/40µA; no external pullup required. |
| 3 | RESET IN | High-impedance adjustable threshold input - connects to external resistor divider; 25nA max leakage enables MΩ-range resistors for ultra-low quiescent current. |
| 4 | MR | Active-low manual reset input - internally pulled up to VCC (20kΩ); driven low to force reset; immune to <150ns glitches. |
| 5 | VCC | Monitored supply input - powers device and serves as reference for RESET IN threshold; valid operation from 0.75V to 1.8V. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset Threshold | Enabled via RESET IN pin with 187.4mV internal reference - allows precise VCC trip point selection (e.g., 0.9V, 1.11V, 1.388V) using two external resistors. |
| Fixed 210ms Reset Timeout | Guaranteed timing after VCC or RESET IN recovery - eliminates need for external RC timing network and improves design reproducibility. |
| Ultra-Low Supply Current | 5.7µA typical at 0.9V - reduces load on coin-cell or energy-harvesting power sources in IoT endpoint devices. |
| VCC Brownout Immunity | Rejects transients <150ns wide - prevents false resets in noisy automotive or industrial power rail environments. |
| Valid Reset Down to 0.55V VCC | Ensures deterministic µP reset state even during deep brownout - critical for fail-safe shutdown in medical and safety-critical systems. |
Applications
| Portable Medical Sensors | Battery-Powered IoT Nodes |
|---|---|
|
Use Scenario: Wearable glucose monitor operating from single 1.2V NiMH cell with gradual voltage decay during discharge. IC Role / Device Role / Timing Role: Voltage supervisor asserting active-high RESET to MSP430 MCU when cell drops below 0.9V, holding reset for 210ms to ensure clean restart. Use Value: Prevents MCU lockup during low-battery operation while extending usable runtime by enabling accurate end-of-life detection without external components. |
Use Scenario: LPWAN sensor node powered by primary lithium thionyl chloride (LiSOCl₂) battery, requiring >10-year shelf life. IC Role / Device Role / Timing Role: Ultra-low-ICC reset controller monitoring 1.5V regulated rail, triggering reset if regulator fails or battery depletes below 1.11V threshold. Use Value: 5.7µA quiescent current minimizes standby drain; adjustable threshold avoids premature shutdown during cold-temperature voltage sag. |
| Industrial PLC I/O Modules | Telecom Baseband Processors |
|
Use Scenario: DIN-rail mounted controller with 0.85V FPGA core supply subject to 100ms line dips during factory motor switching. IC Role / Device Role / Timing Role: Brownout detector using RESET IN pin to set 0.833V trip point, asserting reset only after sustained dip exceeds 210ms timeout. Use Value: Eliminates nuisance resets from transient sags while ensuring reliable recovery - no external timing capacitor or precision reference needed. |
Use Scenario: 5G small-cell baseband ASIC powered from 1.0V core rail with strict power sequencing requirements. IC Role / Device Role / Timing Role: Primary reset generator providing active-high signal to ASIC's POR pin, synchronized to 1.0V rail stability with ±2.5% threshold tolerance. Use Value: Guarantees deterministic boot sequence across temperature; push-pull output drives heavy capacitive loads without rise-time degradation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage-monitoring reset applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6843UKD3+ | Active-low push-pull RESET output; identical RESET IN threshold, timeout, and supply specs. | Requires inverted reset logic on µP side; not suitable for systems needing active-high assertion without level-shifting. | Select when interfacing with legacy µPs that accept only active-low reset inputs and lack internal inversion. |
| TPS3808G33DBVR | Fixed 3.3V threshold; 200ms timeout (min); 1.4µA ICC; SOT23-6 package; requires external pullup for open-drain variant. | Not adjustable; limited to higher-VCC applications; lacks RESET IN pin for ultra-low-VCC customization. | Choose only for 3.3V systems where ultra-low quiescent current outweighs adjustability and sub-1V support. |
Compared with MAX6844UKD3+, MAX6843UKD3+ offers identical supervision accuracy and timing but inverted output polarity, while TPS3808G33DBVR trades adjustability and ultra-low-VCC capability for lower ICC at fixed 3.3V - making MAX6844UKD3+ uniquely suited for sub-1V, field-programmable reset in space-constrained portable designs.
Availability
MAX6844UKD3+ is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered IoT nodes, industrial PLC I/O modules, telecom baseband processors, and critical µP power monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6844UKD3+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and consumer applications.
The MAX6841–MAX6845 family was designed specifically for ultra-low-voltage microprocessor supervision in portable and battery-operated equipment, addressing the need for sub-1V reset accuracy, nanoscale leakage control, and minimal external component count.
FAQ
What is the exact reset timeout period for MAX6844UKD3+?
The MAX6844UKD3+ has a typical reset active timeout period of 210ms, with minimum 140ms and maximum 280ms across temperature and process variation. This fixed delay begins after VCC or RESET IN rises above its respective threshold and MR is released, ensuring sufficient hold time for microprocessor initialization before release.
How do I configure the reset threshold for MAX6844UKD3+?
The MAX6844UKD3+ uses the RESET IN pin with an internal 187.4mV reference (relative to VCC) to set the trip point via an external resistor divider. For example, to monitor a 0.9V supply, connect R1 between VCC and RESET IN, and R2 between RESET IN and GND; calculate R1 = R2 × ((VCC–TH / VRSTIN) – 1), where VCC–TH = 0.9V and VRSTIN = 0.1874V.
Does MAX6844UKD3+ support operation below 1.0V?
Yes, MAX6844UKD3+ operates from VCC = 0.75V to 1.8V and guarantees valid active-high RESET output down to VCC = 0.55V. Its adjustable RESET IN architecture enables precise threshold setting as low as 0.765V (suffix D), making it suitable for modern sub-1V ASIC and FPGA core supplies.
What is the function of the MR pin on MAX6844UKD3+?
The MR pin on MAX6844UKD3+ is an active-low manual reset input with internal 20kΩ pullup to VCC. Pulling MR low forces an immediate reset assertion, which remains active for the full 210ms timeout after MR returns high. It accepts CMOS logic levels and rejects glitches shorter than 150ns, eliminating need for external debounce circuitry.
Is MAX6844UKD3+ pin-compatible with other parts in the MAX6841–MAX6845 family?
Yes, MAX6844UKD3+ shares the identical 5-pin SOT23-5 package and pinout with all MAX6841–MAX6845 variants, including MAX6841UKD3+, MAX6842UKD3+, MAX6843UKD3+, and MAX6845UKD3+. Pin functions are consistent across the family: Pin 1 = GND, Pin 2 = RESET, Pin 3 = RESET IN, Pin 4 = MR, Pin 5 = VCC.
MAX6844UKD3+ 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:
- Adjustable/Selectable
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6844UKD3+ FAQ
1.How can I place an order for MAX6844UKD3+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6844UKD3+ 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 MAX6844UKD3+ reliable?
The price and inventory of MAX6844UKD3+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6844UKD3+ is usually 5 days.
3.What payment methods are accepted for MAX6844UKD3+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6844UKD3+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6844UKD3+?
MAX6844UKD3+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6844UKD3+ 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 MAX6844UKD3+?
For technical support, including MAX6844UKD3+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6844UKD3+ requirements.
6.How does Aetrix verify that MAX6844UKD3+ is sourced from the original manufacturer or authorized distributors?
All MAX6844UKD3+ 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 MAX6844UKD3+ meets industry standards.
7.What is the process for return or replacement of MAX6844UKD3+?
All MAX6844UKD3+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6844UKD3+, 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 MAX6844UKD3+ part is unused and in its original packaging.
Return procedure for MAX6844UKD3+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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