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Analog Devices Inc./Maxim Integrated MAX6844UKD0+T
- Part No.:
- MAX6844UKD0+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6844UKD0+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,427
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Product details
Overview
MAX6844UKD0+T from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit with adjustable reset threshold via RESET IN input, 150µs reset timeout (voltage detector mode), active-high push-pull RESET output, and manual reset (MR) input - designed for reliable power monitoring in 0.75V–1.8V systems such as portable battery-powered controllers and telecom baseband ICs.
For engineers reviewing the MAX6844UKD0+T datasheet, MAX6844UKD0+T pinout, MAX6844UKD0+T application, or MAX6844UKD0+T equivalent, this page delivers verified functional identity, SOT23-5 package mapping, confirmed 5-pin terminal roles, ±2.5% threshold accuracy over temperature, and design-meaningful timing and interface specifications - all validated against Maxim's official datasheet Rev 2 (12/05).
Technical Context
The MAX6844UKD0+T implements a precision voltage comparator referenced to an internal 187.4mV bandgap-derived threshold at RESET IN, enabling externally adjustable VCC monitoring via resistive divider. Its reset assertion logic responds to either falling RESET IN voltage below threshold or MR low pulse, with immunity to sub-150ns VCC transients.
It features a fixed 150µs timeout period (D0 suffix), guaranteed reset validity down to VCC = 0.55V, and an active-high push-pull RESET output capable of sourcing 40µA at 0.8×VCC while sinking 80µA at 0.2×VCC - supporting direct interfacing with CMOS µP reset inputs without external pullups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 0.75V to 1.8V - supports core rails of modern ultra-low-power SoCs and FPGAs |
| RESET IN Threshold | 187.4mV (typ), referenced to VCC - enables precise external threshold setting via resistor divider |
| Reset Timeout Period | 150µs (typ) - optimized for voltage-detection-only use cases, not system-level brownout recovery |
| Supply Current | 5.7µA (typ at VCC = 0.9V) - enables multi-year battery life in always-on monitoring circuits |
| Reset Threshold Accuracy | ±2.5% over -40°C to +85°C - ensures deterministic reset behavior across industrial temperature range |
| MR Input Pullup | 20kΩ internal - eliminates need for external pullup; allows direct switch-to-ground connection |
| RESET Output Type | Active-high push-pull - drives high without external components; compatible with standard µP reset inputs |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant), footprint compatible with JEDEC MO-178AB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for all internal circuitry and reset comparator |
| 2 | RESET | Active-high push-pull output - asserts high during reset; sinks 80µA / sources 40µA |
| 3 | RESET IN | High-impedance adjustable threshold input - accepts voltage divider referenced to VCC |
| 4 | MR | Active-low manual reset input - internally pulled up to VCC (20kΩ); glitch-filtered |
| 5 | VCC | Supply and monitored rail - powers device and provides reference for RESET IN threshold |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Enabled via RESET IN pin with 187.4mV internal reference - supports custom VCC thresholds from 0.8V to 1.5V using two resistors |
| Ultra-low quiescent current | 5.7µA typical - reduces standby power in battery-critical applications like IoT edge sensors |
| VCC transient immunity | Rejects <150ns falling glitches on VCC - prevents spurious resets in noisy power environments |
| Guaranteed reset operation | Valid down to VCC = 0.55V - ensures reset assertion even during deep brownout conditions |
| Integrated MR pullup | 20kΩ internal resistor - eliminates BOM count and layout area for manual reset switch interface |
Applications
| Portable Power Management | Telecom Baseband Monitoring |
|---|---|
Use Scenario: Real-time voltage supervision of 0.9V FPGA core supply in handheld test equipment with Li-ion battery input. IC Role / Device Role / Timing Role: Voltage detector and reset generator - asserts active-high RESET within 150µs of VCC drop below threshold. Use Value: Prevents corrupted configuration loading by ensuring FPGA remains held in reset until stable 0.9V rail is re-established. |
Use Scenario: Monitoring 1.2V DSP core supply in 4G/LTE small-cell basestation radio unit. IC Role / Device Role / Timing Role: Adjustable-threshold supervisor - RESET IN configured for 1.11V trip point via external divider. Use Value: Enables precise margining of DSP supply tolerance without redesigning PCB or changing IC. |
| Industrial Controller Brownout Protection | Low-Power Sensor Node Supervision |
Use Scenario: Ensuring deterministic restart of ARM Cortex-M0+ MCU after 3.3V-to-1.2V DC/DC converter brownout. IC Role / Device Role / Timing Role: Manual-reset-enabled supervisor - MR tied to front-panel button; RESET drives MCU nRST pin directly. Use Value: Eliminates need for external level shifter or pullup, reducing component count in space-constrained PLC modules. |
Use Scenario: Long-life battery operation of environmental sensor node with 1.5V RF transceiver and 0.8V microcontroller core. IC Role / Device Role / Timing Role: Ultra-low-current supervisor - draws only 5.7µA while continuously monitoring 0.8V rail. Use Value: Extends 10-year battery life by minimizing quiescent load during sleep cycles without sacrificing reset reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6843UKD0+T | Active-low push-pull RESET output; identical RESET IN threshold, timeout, and supply specs | Requires inverted logic handling at µP reset input; no pullup needed for active-low assertion | Select when target µP accepts active-low reset and board layout already accommodates polarity |
| TPS3123E12DBVR | Fixed 1.2V threshold; 200ms timeout; 1.6V–6V supply range; 1.5µA ICC | Lacks adjustable threshold and MR input; optimized for higher-VDD systems with longer timeouts | Choose for cost-sensitive, fixed-threshold applications where 1.2V monitoring suffices and MR is unnecessary |
Compared with MAX6844UKD0+T, MAX6843UKD0+T offers identical supervision accuracy and adjustability but requires active-low µP interface logic, while TPS3123E12DBVR trades flexibility for lower current and simpler implementation in non-adjustable 1.2V systems - making MAX6844UKD0+T optimal for designs needing both programmable threshold and active-high drive without external components.
Availability
MAX6844UKD0+T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, telecom baseband monitoring, and industrial controller brownout protection requiring stable component supply, full RoHS compliance, and tape-and-reel delivery for automated assembly.
Supply support for MAX6844UKD0+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, computing, and communications markets.
The MAX6841–MAX6845 family was designed specifically for ultra-low-voltage microprocessor supervision in battery-constrained and space-limited systems - delivering precision reset generation with minimal external components and sub-6µA quiescent current.
FAQ
What is the exact reset timeout period of the MAX6844UKD0+T?
The MAX6844UKD0+T has a fixed reset timeout period of 150µs (typical), corresponding to the D0 suffix in its part number. This value is factory-trimmed and guaranteed across -40°C to +85°C. It is intended for voltage-detection applications rather than full-system power-up sequencing, and does not vary with temperature or supply voltage within specification limits.
Does the MAX6844UKD0+T require external components to set its reset threshold?
Yes - the MAX6844UKD0+T uses an adjustable reset threshold via its RESET IN pin, which references an internal 187.4mV threshold relative to VCC. A two-resistor divider from VCC to GND, with the junction connected to RESET IN, sets the effective trip point. No external reference or trimming is needed; resistor values are calculated using the formula R1 = R2 × (VCC_TH / 0.1874 − 1).
What is the minimum VCC voltage at which the MAX6844UKD0+T guarantees valid reset operation?
The MAX6844UKD0+T guarantees valid reset assertion down to VCC = 0.55V for the active-high push-pull RESET output. Below this voltage, the output stage ceases to sink or source current reliably. This specification ensures robust brownout detection even as the supply collapses - critical for preventing undefined states in low-voltage microcontrollers.
Can the MAX6844UKD0+T be used with a 0.9V supply rail?
Yes - the MAX6844UKD0+T is explicitly rated for VCC = 0.75V to 1.8V, making it fully compatible with 0.9V supplies. At 0.9V, its typical supply current is 5.7µA, RESET IN threshold remains 187.4mV (referenced to VCC), and the active-high RESET output maintains 0.8×VCC high-level drive strength, ensuring interoperability with 0.9V logic families.
How does the manual reset (MR) input function on the MAX6844UKD0+T?
The MR input on the MAX6844UKD0+T is an active-low, internally pulled-up (20kΩ to VCC) signal. Pulling MR low forces immediate reset assertion, which persists for the full 150µs timeout after MR returns high. The input rejects <150ns glitches and requires no external debounce - enabling direct connection to a momentary switch or open-drain logic output without additional components.
MAX6844UKD0+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:
- Adjustable/Selectable
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 150µs Typical
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6844UKD0+T FAQ
1.How can I place an order for MAX6844UKD0+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6844UKD0+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 MAX6844UKD0+T reliable?
The price and inventory of MAX6844UKD0+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6844UKD0+T is usually 5 days.
3.What payment methods are accepted for MAX6844UKD0+T?
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4.How is shipping managed for MAX6844UKD0+T?
MAX6844UKD0+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6844UKD0+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 MAX6844UKD0+T?
For technical support, including MAX6844UKD0+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6844UKD0+T requirements.
6.How does Aetrix verify that MAX6844UKD0+T is sourced from the original manufacturer or authorized distributors?
All MAX6844UKD0+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 MAX6844UKD0+T meets industry standards.
7.What is the process for return or replacement of MAX6844UKD0+T?
All MAX6844UKD0+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6844UKD0+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 MAX6844UKD0+T part is unused and in its original packaging.
Return procedure for MAX6844UKD0+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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