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Analog Devices Inc./Maxim Integrated MAX6843UKD3+T
- Part No.:
- MAX6843UKD3+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX6843UKD3+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,357
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Product details
Overview
The MAX6843UKD3+T from Maxim Integrated is an ultra-low-voltage microprocessor supervisory circuit with adjustable reset threshold via RESET IN pin, 210ms reset timeout (typ), ±2.5% threshold accuracy over temperature, and active-low push-pull RESET output - designed for reliable power-on/brownout reset in portable 0.9V–1.5V digital systems.
For engineers reviewing the MAX6843UKD3+T datasheet, MAX6843UKD3+T pinout, MAX6843UKD3+T application, or MAX6843UKD3+T equivalent, this page delivers verified functional identity, SOT23-5 package mapping, confirmed reset timing and threshold behavior, manual reset integration, and real-world substitution guidance - all grounded in Maxim's official datasheet Rev 2 (12/05).
Technical Context
The MAX6843UKD3+T implements a precision voltage comparator referenced to VCC, with internal 187.4mV threshold at RESET IN pin, enabling externally adjustable reset points using a resistive divider. Its reset assertion is immune to VCC transients ≤150ns (glitch rejection) and guarantees valid reset down to VCC = 0.55V.
It features a debounced manual reset input (MR) with 20kΩ internal pullup, fixed 210ms timeout after VCC or RESET IN recovery, and operates across -40°C to +85°C with supply current as low as 5.7µA at 0.9V - optimized for battery-powered systems requiring minimal quiescent power and space-constrained layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Timeout Period | 210ms typical - ensures µP completes full initialization before release from reset state |
| RESET IN Threshold | 187.4mV (referenced to VCC) - sets precise adjustable reset point via external resistor divider |
| Supply Current | 5.7µA typ at VCC = 0.9V - enables multi-year operation in coin-cell–powered devices |
| Reset Threshold Accuracy | ±2.5% over -40°C to +85°C - eliminates need for field calibration in industrial environments |
| VCC Operating Range | 0.55V to 1.8V - supports direct monitoring of core supplies in sub-1V SoCs and FPGAs |
| MR Input Pulse Width | 1µs minimum - allows clean reset initiation even with fast-switching logic or short button presses |
| Reset Output Type | Active-low push-pull - drives CMOS inputs directly without external pullup, reducing BOM count |
Pinout & Package
Package: 5-pin SOT23-5, surface-mount, lead-free (RoHS-compliant), footprint compatible with JEDEC MO-178AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - asserts low during power failure or MR activation; sinks/source capability defined per spec |
| 2 | GND | Ground reference for all internal comparators and bias circuits - must be low-impedance connection to system ground plane |
| 3 | RESET IN | High-impedance adjustable reset threshold input - accepts voltage divider output referenced to VCC; 25nA max leakage |
| 4 | MR | Active-low manual reset input - internally pulled up to VCC (20kΩ); initiates reset when pulled below 0.3×VCC |
| 5 | VCC | Monitored supply input - powers device and serves as reference for RESET IN threshold; valid down to 0.55V |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset Threshold | Enabled via RESET IN pin with 187.4mV internal reference - supports custom VCC thresholds (e.g., 0.9V, 1.2V) using two external resistors |
| Glitch Immunity | Rejects VCC transients ≤150ns - prevents spurious resets in noisy DC/DC converter environments |
| Low-Power Operation | 5.7µA supply current at 0.9V - extends battery life in wearables and IoT edge sensors |
| Valid Reset Down to 0.55V | Guaranteed push-pull output functionality until VCC drops to 0.55V - ensures deterministic reset before brownout lockup |
| Debounced Manual Reset | Internal MR filtering eliminates need for external RC network - simplifies PCB layout and reduces component count |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered glucose monitor with ultra-low-power MCU operating from 1.0V LDO. IC Role / Device Role / Timing Role: Supervisory circuit asserting reset during battery sag below 0.95V and on user-initiated recalibration. Use Value: 210ms timeout ensures ADC and RF subsystems fully stabilize before firmware execution resumes. |
Use Scenario: DIN-rail mounted controller monitoring 1.2V FPGA core rail in harsh factory environment. IC Role / Device Role / Timing Role: Adjustable-threshold supervisor interfacing with isolated MR switch and noise-filtered RESET IN divider. Use Value: ±2.5% threshold accuracy maintains reset reliability across -40°C to +85°C ambient without derating. |
| Wearable Fitness Trackers | Telecom Baseband Processors |
Use Scenario: Coin-cell–powered activity tracker with BLE SoC requiring guaranteed reset at end-of-battery-life. IC Role / Device Role / Timing Role: Low-ICC supervisor monitoring 0.9V supply; RESET IN configured for 0.85V threshold. Use Value: 5.7µA quiescent current minimizes standby drain, extending usable battery life by >12% vs. legacy supervisors. |
Use Scenario: 5G small-cell baseband processor with dual-core ARM and 1.1V core supply subject to transient load steps. IC Role / Device Role / Timing Role: Brownout detector with 150ns glitch rejection protecting against DC/DC switching noise. Use Value: Immunity to fast VCC dips prevents false resets during high-current TX bursts, improving link uptime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6844UKD3+T | Active-high push-pull RESET output instead of active-low; identical RESET IN, MR, timeout, and threshold specs | Required where host µP reset pin is active-high or level-sensitive rather than active-low | Select MAX6844UKD3+T only when system reset logic expects high-asserted signal; pinout and footprint match exactly |
| TPS3123QDBVRQ1 | Fixed 1.23V threshold (non-adjustable), 200ms timeout, 3.5µA ICC, automotive-grade (-40°C to +125°C) | Used in automotive infotainment modules where AEC-Q100 qualification and fixed threshold suffice | Choose TPS3123QDBVRQ1 for automotive designs needing extended temperature range and lower ICC, but accept loss of threshold adjustability |
Compared with MAX6843UKD3+T, MAX6844UKD3+T offers identical supervision functionality with inverted reset polarity - ideal for active-high µP interfaces - while TPS3123QDBVRQ1 trades adjustability for automotive qualification and lower quiescent current, making it suitable for vehicle ECU applications where fixed threshold is acceptable.
Availability
MAX6843UKD3+T is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wearable fitness trackers, and telecom baseband processors requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6843UKD3+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, mixed-signal, and power management ICs for demanding industrial, computing, and communications applications.
The MAX6843UKD3+T belongs to the MAX6841–MAX6845 family of ultra-low-voltage µP supervisors - engineered specifically for reliable reset generation in sub-1.5V digital systems where space, power, and accuracy are critical constraints.
FAQ
What is the exact reset timeout period of the MAX6843UKD3+T?
The MAX6843UKD3+T has a typical reset active timeout period of 210ms, with minimum and maximum values of 140ms and 280ms respectively, as specified in Table 2 of the datasheet under suffix D3. This fixed delay begins after VCC or RESET IN rises above its threshold and continues after MR is released, ensuring sufficient time for system stabilization before µP release.
How do I configure the reset threshold for MAX6843UKD3+T?
The MAX6843UKD3+T uses its RESET IN pin to accept an externally generated threshold voltage referenced to VCC. With an internal 187.4mV reference, a simple resistor divider (e.g., R1 = 26.3kΩ, R2 = 100kΩ for 0.9V VCC threshold) sets the trip point. The MAX6843UKD3+T asserts reset when the voltage at RESET IN falls below this value, enabling precise customization without trimming components.
Does MAX6843UKD3+T support operation below 1.0V?
Yes, the MAX6843UKD3+T operates across VCC = 0.55V to 1.8V and guarantees valid active-low push-pull RESET output down to 0.55V. Its 5.7µA supply current at 0.9V and ±2.5% threshold accuracy over temperature make it suitable for modern sub-1V SoCs, FPGAs, and ultra-low-power MCUs where traditional supervisors fail to function.
What is the function of the MR pin on MAX6843UKD3+T?
The MR pin on MAX6843UKD3+T is an active-low manual reset input with internal 20kΩ pullup to VCC. Pulling MR low forces immediate reset assertion, which remains active for the full 210ms timeout after MR returns high. It requires no external debounce circuitry and accepts CMOS-level signals or momentary switch closure to GND - simplifying system-level reset control.
Is MAX6843UKD3+T pin-compatible with other parts in the MAX6841–MAX6845 family?
Yes, MAX6843UKD3+T shares the identical 5-pin SOT23-5 package and pinout with all members of the MAX6841–MAX6845 family, including MAX6841UKD3+T, MAX6842UKD3+T, MAX6844UKD3+T, and MAX6845UKD3+T. Pin 1 is RESET, Pin 2 is GND, Pin 3 is RESET IN, Pin 4 is MR, and Pin 5 is VCC - enabling drop-in replacement within the same suffix group when output polarity or adjustability requirements change.
MAX6843UKD3+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Cut Tape (CT)
- 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 Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX6843UKD3+T FAQ
1.How can I place an order for MAX6843UKD3+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6843UKD3+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 MAX6843UKD3+T reliable?
The price and inventory of MAX6843UKD3+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6843UKD3+T is usually 5 days.
3.What payment methods are accepted for MAX6843UKD3+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6843UKD3+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6843UKD3+T?
MAX6843UKD3+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6843UKD3+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 MAX6843UKD3+T?
For technical support, including MAX6843UKD3+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6843UKD3+T requirements.
6.How does Aetrix verify that MAX6843UKD3+T is sourced from the original manufacturer or authorized distributors?
All MAX6843UKD3+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 MAX6843UKD3+T meets industry standards.
7.What is the process for return or replacement of MAX6843UKD3+T?
All MAX6843UKD3+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6843UKD3+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 MAX6843UKD3+T part is unused and in its original packaging.
Return procedure for MAX6843UKD3+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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