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Analog Devices Inc./Maxim Integrated MAX6844UKD2-T
- Part No.:
- MAX6844UKD2-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6844UKD2-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:7,500
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Product details
Overview
MAX6844UKD2-T from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit with adjustable reset threshold, active-high push-pull RESET output, 30ms reset timeout, and operation down to VCC = 0.75V. It monitors power supplies in portable and battery-powered systems, provides manual reset (MR) input with internal 20kΩ pullup, and guarantees valid reset assertion down to VCC = 0.55V.
For engineers reviewing the MAX6844UKD2-T datasheet, MAX6844UKD2-T pinout, MAX6844UKD2-T application, or MAX6844UKD2-T equivalent, key selection criteria include its adjustable RESET IN threshold (187.4mV referenced to VCC), ±2.5% reset threshold accuracy over temperature, 5.7µA typical supply current, SOT23-5 package, and compatibility with 0.9V–1.5V core supply monitoring.
Technical Context
The MAX6844UKD2-T implements a precision voltage comparator with RESET IN input referenced to VCC, enabling user-defined reset thresholds via external resistor divider. Its reset logic asserts active-high RESET when RESET IN falls below 187.4mV (VCC-referenced) or MR is pulled low, holding assertion for a fixed 30ms timeout after recovery.
It features glitch-immune MR input (150ns rejection), 500ns MR-to-reset delay, and operates across -40°C to +85°C with guaranteed functionality at VCC as low as 0.75V. The push-pull output drives high to VCC with 0.8×VCC VOH (ISOURCE = 40µA) and sinks to 0.2×VCC VOL (ISINK = 80µA) when asserted.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Timeout Period | 30ms typical - ensures sufficient hold time for µP initialization after brownout recovery |
| RESET IN Threshold | 187.4mV (referenced to VCC) - enables precise external threshold setting via resistive divider |
| Supply Current | 5.7µA typical at VCC = 0.9V - minimizes quiescent drain in battery-critical applications |
| Reset Threshold Accuracy | ±2.5% over temperature - maintains reliable reset timing across industrial operating range |
| VCC Operating Range | 0.75V to 1.8V - supports modern ultra-low-voltage digital cores (e.g., 0.9V/1.0V/1.2V) |
| MR Input Pullup | 20kΩ internal - eliminates need for external pullup; allows direct switch-to-ground connection |
| Output Type | Active-high push-pull - provides rail-to-rail drive without external pullup resistor |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free compatible (ordered with "+T" suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and reset comparator |
| 2 | RESET | Active-high push-pull reset output - drives high during reset assertion; no external pullup required |
| 3 | RESET IN | Adjustable reset threshold input - high-impedance node referenced to VCC; sets trip point via external divider |
| 4 | MR | Active-low manual reset input - internally pulled up to VCC; forces reset when pulled low |
| 5 | VCC | Supply and monitored voltage input - powers device and serves as reference for RESET IN threshold |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Enabled via RESET IN pin with 187.4mV VCC-referenced comparator - supports custom VCC monitoring without factory trimming |
| Low-power supervision | 5.7µA typical ICC at 0.9V - extends battery life in portable equipment without sacrificing reliability |
| Glitch-immune MR input | 150ns transient rejection on MR - prevents spurious resets from EMI or switch bounce |
| Valid reset down to low VCC | Guaranteed RESET assertion to VCC = 0.55V - ensures robust power-down sequencing in deep-sleep states |
| Five timeout options | 30ms option (D2 suffix) - balances µP startup timing margin with fast recovery in responsive systems |
Applications
| Battery-Powered IoT Sensors | Ultra-Low-Voltage Microcontrollers |
|---|---|
Use Scenario: A coin-cell-powered environmental sensor node wakes periodically, samples data, and transmits via BLE before returning to deep sleep. IC Role / Device Role / Timing Role: MAX6844UKD2-T monitors the 0.9V LDO output powering the MCU and RF transceiver, asserting reset if supply sags during transmit burst. Use Value: Its 30ms timeout ensures full MCU register initialization after brownout, while 5.7µA quiescent current avoids measurable impact on multi-year battery life. | Use Scenario: An industrial controller uses a 1.0V core voltage MCU with tight power budget and frequent partial power cycles. IC Role / Device Role / Timing Role: MAX6844UKD2-T provides active-high reset signaling synchronized to VCC recovery, interfacing directly with the MCU's dedicated reset pin. Use Value: Push-pull output eliminates pullup resistor, saving board space and leakage path; adjustable threshold accommodates aging or tolerance drift in the 1.0V supply. |
| Portable Medical Devices | Telecom Baseband Modules |
Use Scenario: A handheld glucose meter uses a 0.95V core supply and requires fail-safe power-on reset under varying battery conditions. IC Role / Device Role / Timing Role: MAX6844UKD2-T supervises the buck converter output feeding the ADC and processor, using RESET IN to set exact 0.95V trip point. Use Value: ±2.5% threshold accuracy ensures consistent reset behavior across temperature, preventing premature wake-up or missed boot sequences. | Use Scenario: A small-cell baseband unit employs multiple voltage rails including a 1.2V FPGA core supply subject to dynamic load transients. IC Role / Device Role / Timing Role: MAX6844UKD2-T monitors the 1.2V rail with 30ms timeout, providing clean reset to FPGA configuration logic after power-up or brownout. Use Value: Immunity to short VCC transients (<150ns) prevents false resets during high-speed switching noise, improving system uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6843UKD2-T | Active-low push-pull RESET output; identical RESET IN, timeout, and supply specs | Requires inverted reset logic on host µP; not compatible with active-high reset inputs | Select when target MCU accepts active-low reset assertion and board layout already accommodates polarity |
| TPS3123E18DBVR | Fixed 1.8V reset threshold; 200ms timeout; 1.6V–5.5V VCC range; SOT23-5 | Lacks adjustable threshold and ultra-low-voltage operation - unsuitable for sub-1.0V systems | Use only if system operates above 1.8V and does not require VCC < 1.0V supervision |
Compared with MAX6843UKD2-T, the MAX6844UKD2-T provides active-high reset signaling essential for µPs without inversion capability; compared with TPS3123E18DBVR, it enables precise low-voltage monitoring (down to 0.75V) and field-adjustable thresholds critical for next-gen portable designs.
Availability
MAX6844UKD2-T is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, ultra-low-voltage microcontrollers, telecom baseband modules, and industrial embedded controllers requiring stable component supply and long-term lifecycle support.
Supply support for MAX6844UKD2-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, computing, and communications markets.
The MAX6841–MAX6845 family was developed specifically for ultra-low-voltage microprocessor supervision in portable and energy-constrained systems, addressing the need for sub-1V reset accuracy, nanoscale quiescent current, and flexible threshold configuration.
FAQ
What is the exact reset timeout period for MAX6844UKD2-T?
The MAX6844UKD2-T has a typical reset active timeout period of 30ms, with minimum and maximum values of 20ms and 40ms respectively, as defined by the D2 suffix in its ordering code. This fixed delay begins after VCC or RESET IN rises above the threshold and MR is released, ensuring sufficient time for microprocessor initialization before release of reset.
Does MAX6844UKD2-T support adjustable reset threshold, and how is it implemented?
Yes, MAX6844UKD2-T supports adjustable reset threshold via its RESET IN pin, which compares the external voltage to an internal 187.4mV reference referenced to VCC. A resistor divider from VCC to GND, with the midpoint connected to RESET IN, sets the effective trip point - for example, a 0.9V threshold requires R1/R2 ≈ 3.75 per the datasheet formula.
What is the lowest VCC voltage at which MAX6844UKD2-T guarantees valid reset assertion?
MAX6844UKD2-T guarantees valid reset assertion down to VCC = 0.55V for the active-low output variants, but for MAX6844UKD2-T (active-high push-pull), valid operation is specified down to VCC = 0.75V. Below this, the push-pull driver may not meet VOH/VOL specifications, though the internal comparator remains functional.
Can MAX6844UKD2-T be used with a 0.9V supply, and what is its supply current at that voltage?
Yes, MAX6844UKD2-T is fully specified for use with 0.9V supplies, operating within its 0.75V–1.8V VCC range. At VCC = 0.9V and TA = +25°C with reset not asserted, its typical supply current is 5.7µA, making it suitable for long-life battery-powered applications where quiescent current is critical.
What is the function of the MR pin on MAX6844UKD2-T, and does it require an external pullup?
The MR pin on MAX6844UKD2-T is an active-low manual reset input with an internal 20kΩ pullup resistor to VCC, so no external pullup is required. Pulling MR low forces reset assertion for the duration of the low signal plus the full 30ms timeout period after release, supporting pushbutton or logic-controlled reset initiation.
MAX6844UKD2-T 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:
- 20ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6844UKD2-T FAQ
1.How can I place an order for MAX6844UKD2-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6844UKD2-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 MAX6844UKD2-T reliable?
The price and inventory of MAX6844UKD2-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6844UKD2-T is usually 5 days.
3.What payment methods are accepted for MAX6844UKD2-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6844UKD2-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6844UKD2-T?
MAX6844UKD2-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6844UKD2-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 MAX6844UKD2-T?
For technical support, including MAX6844UKD2-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6844UKD2-T requirements.
6.How does Aetrix verify that MAX6844UKD2-T is sourced from the original manufacturer or authorized distributors?
All MAX6844UKD2-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 MAX6844UKD2-T meets industry standards.
7.What is the process for return or replacement of MAX6844UKD2-T?
All MAX6844UKD2-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6844UKD2-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 MAX6844UKD2-T part is unused and in its original packaging.
Return procedure for MAX6844UKD2-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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