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Analog Devices Inc./Maxim Integrated MAX6839XSD0+T
- Part No.:
- MAX6839XSD0+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6839XSD0+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:3,054
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Product details
Overview
MAX6839XSD0+T from Maxim Integrated is a push-pull, active-high microprocessor reset circuit in SC70-4 package, designed to monitor supply voltage via an adjustable RESET-IN input with 444mV internal reference. It provides 1.5ms reset timeout, operates from VCC = 1.1V to 3.3V, and guarantees valid reset output down to VCC = 0.75V. It is used in low-voltage portable systems requiring precise, externally configurable power-on reset.
For engineers reviewing the MAX6839XSD0+T datasheet, MAX6839XSD0+T pinout, MAX6839XSD0+T application, or MAX6839XSD0+T equivalent, key selection criteria include its adjustable threshold architecture, 1.5ms fixed timeout, push-pull active-high output drive capability, ±3.0% RESET-IN threshold accuracy over temperature, and compatibility with sub-1.2V monitored rails using external resistor dividers.
Technical Context
The MAX6839XSD0+T uses a high-impedance comparator to monitor voltage at the RESET-IN pin against a factory-trimmed 444mV reference. Reset assertion occurs when RESET-IN falls below this threshold, independent of VCC-enabling monitoring of supplies as low as 0.44V with appropriate divider scaling.
Its push-pull active-high RESET output drives high (VOH ≥ 0.8×VCC) during reset assertion and low (VOL ≤ 0.2×VCC) otherwise, supporting direct interface to µP reset inputs without external pullups. The device draws only 7.5µA typical supply current and remains functional down to VCC = 0.75V for guaranteed reset validity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Output Type | Push-pull, active-high - eliminates need for external pullup resistor and ensures defined logic level during all operating conditions. |
| RESET-IN Threshold | 444mV ±3.0% - enables precise external voltage monitoring via resistive divider; supports trip points from 0.44V upward. |
| Reset Timeout Period | 1.5ms (D1 suffix) - provides sufficient hold time for reliable µP initialization after power stabilization. |
| VCC Operating Range | 1.1V to 3.3V - powers the IC while allowing RESET-IN to monitor lower-voltage rails (e.g., 0.6V core supplies). |
| Supply Current | 7.5µA (typ) at VCC = 1.2V - minimizes quiescent load in battery-powered applications. |
| Reset Validity Limit | VCC ≥ 0.75V - guarantees RESET output remains valid and driven to correct logic state down to this supply level. |
| RESET-IN Leakage | ±25nA - permits use of high-value resistors (e.g., 200kΩ) in divider networks, reducing power consumption. |
Pinout & Package
MAX6839XSD0+T is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), RoHS-compliant with lead-free termination (+T suffix). Pin 1 is RESET-IN, Pin 2 is VCC, Pin 3 is GND, and Pin 4 is RESET (push-pull, active-high).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET-IN | High-impedance input for external voltage monitoring; referenced to 444mV internal comparator threshold. |
| 2 | VCC | IC supply input (1.1V–3.3V); powers internal circuitry but does not define monitored voltage. |
| 3 | GND | Analog and digital ground reference for comparator and output stage. |
| 4 | RESET | Push-pull active-high output; drives high during reset assertion and low otherwise-no external pullup required. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable threshold monitoring | Enables precise reset trip point selection (e.g., 0.6V, 0.8V, 1.0V) using external resistor divider on RESET-IN, decoupling monitored rail from VCC requirements. |
| Guaranteed reset validity to VCC = 0.75V | Ensures RESET output remains actively driven (VOH ≥ 0.8×VCC) even as supply drops-critical for deterministic behavior during brownout. |
| Low 7.5µA supply current | Extends battery life in portable equipment; negligible impact on system power budget across full temperature range. |
| Immunity to short VCC transients | Rejects negative glitches <100ns wide at 100mV overdrive-prevents spurious resets in noisy power environments. |
| SC70-4 footprint | Provides space-constrained design flexibility with industry-standard 2.0mm × 2.1mm outline and compatible land pattern. |
Applications
| Wearable Health Sensors | Ultra-Low-Power IoT Nodes |
|---|---|
Use Scenario: A coin-cell–powered ECG sensor monitors heart rate continuously and wakes a microcontroller only on anomaly detection. IC Role / Device Role / Timing Role: MAX6839XSD0+T supervises the 0.9V LDO output powering the analog front-end and asserts reset if voltage sags below 0.9V (set via 444mV divider). Use Value: Ensures analog signal chain initializes cleanly before sampling begins, eliminating corrupted baseline readings caused by undervoltage startup. |
Use Scenario: A LoRaWAN end-node sleeps for hours between transmissions, waking only to read environmental sensors and transmit data. IC Role / Device Role / Timing Role: MAX6839XSD0+T monitors the 1.1V buck converter output feeding the MCU core; its 1.5ms timeout aligns with typical wake-up latency requirements. Use Value: Prevents firmware execution from unstable supply states, avoiding flash corruption or register lockup during deep-sleep exit. |
| Industrial Sensor Transmitters | Medical Diagnostic Handhelds |
Use Scenario: A 4–20mA loop-powered pressure transmitter operates from a 3.3V auxiliary rail derived from the loop, with tight thermal constraints. IC Role / Device Role / Timing Role: MAX6839XSD0+T monitors the 1.2V digital supply using RESET-IN; VCC is tied to 3.3V for stable operation while sensing lower rail. Use Value: Enables accurate voltage supervision without loading the sensitive 1.2V rail-leakage current <25nA preserves measurement integrity. |
Use Scenario: A handheld ultrasound probe uses a 1.0V FPGA core supply and must guarantee safe boot sequence under varying battery charge levels. IC Role / Device Role / Timing Role: MAX6839XSD0+T's RESET-IN pin monitors the 1.0V rail directly via resistor divider; its 1.5ms timeout satisfies FPGA configuration timing. Use Value: Eliminates need for discrete comparator + timer solution, reducing BOM count and PCB area while maintaining ±3% threshold accuracy over –40°C to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6836XSD0+T | Push-pull active-high output, same SC70-4 package, but uses MR input instead of RESET-IN; fixed threshold (e.g., 1.575V for V suffix). | Suitable for systems where VCC itself is the monitored rail and manual reset is required; cannot monitor voltages below VCC. | Select MAX6836XSD0+T when supervising the IC's own supply and needing debounced MR functionality-not for external rail monitoring. |
| TLV803EA29DBVR | Fixed 2.93V threshold, SOT-23-3, 1.5ms timeout, open-drain active-low output; no RESET-IN or MR pins. | Limited to higher-voltage rails (>2.9V); requires external pullup and cannot adjust trip point-only viable for simple VCC >3V monitoring. | Choose TLV803EA29DBVR only for cost-sensitive, non-adjustable 3V+ applications where board space allows SOT-23 and open-drain interface is acceptable. |
Compared with MAX6836XSD0+T and TLV803EA29DBVR, the MAX6839XSD0+T uniquely supports externally adjustable low-voltage monitoring (down to 0.44V) with active-high push-pull drive-making it the only option among the three for reliable reset generation from sub-1.2V rails without additional components.
Availability
MAX6839XSD0+T is available at Aetrix Electronics and suitable for ultra-low-power portable equipment, industrial sensor transmitters, and medical diagnostic handhelds requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6839XSD0+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, medical, and communications applications.
The MAX6832–MAX6840 family was developed specifically for ultra-low-voltage µP reset supervision in battery-powered and energy-harvesting systems where supply rails fall below 1.2V and external threshold adjustment is essential.
FAQ
What is the function of the RESET-IN pin on the MAX6839XSD0+T?
The RESET-IN pin on the MAX6839XSD0+T serves as a high-impedance input for external voltage monitoring. It connects to an external resistor divider that scales the target supply voltage down to match the device's internal 444mV comparator reference. When the scaled voltage falls below 444mV, the MAX6839XSD0+T asserts its active-high RESET output. This architecture allows the MAX6839XSD0+T to supervise rails as low as 0.44V without requiring the monitored voltage to power the IC itself.
Does the MAX6839XSD0+T require an external pullup resistor on its RESET pin?
No, the MAX6839XSD0+T does not require an external pullup resistor on its RESET pin because it features a push-pull active-high output stage. Unlike open-drain supervisors, this output actively drives both HIGH (≥0.8×VCC) during reset assertion and LOW (≤0.2×VCC) otherwise. This eliminates dependency on external components for logic-level definition and ensures robust interfacing with µP reset inputs-even under low-VCC conditions down to 0.75V.
What is the guaranteed operating VCC range for the MAX6839XSD0+T?
The MAX6839XSD0+T is specified to operate with VCC between 1.1V and 3.3V across the full temperature range of –40°C to +85°C. Within this range, the internal circuitry-including the 444mV reference, comparator, and push-pull output driver-functions reliably. Note that VCC powers the IC but does not define the monitored voltage; the RESET-IN pin enables supervision of lower rails (e.g., 0.6V) independently.
How accurate is the RESET-IN threshold voltage of the MAX6839XSD0+T over temperature?
The RESET-IN threshold voltage of the MAX6839XSD0+T is 444mV with ±3.0% accuracy over the full operating temperature range of –40°C to +85°C. This specification applies when VCC is maintained between 1.1V and 3.3V. The low leakage current (±25nA) at RESET-IN further ensures minimal error contribution from divider resistor self-heating or parasitic paths, preserving threshold stability in precision applications.
Can the MAX6839XSD0+T be used to monitor a 0.6V supply rail?
Yes, the MAX6839XSD0+T can monitor a 0.6V supply rail using an external resistor divider on the RESET-IN pin. With a 444mV internal reference, a divider ratio of R1/R2 = (0.6V / 0.444V) − 1 ≈ 0.35 yields the correct scaling. For example, using R2 = 200kΩ gives R1 ≈ 70kΩ. The MAX6839XSD0+T's ±25nA RESET-IN leakage and ±3.0% threshold accuracy ensure trip-point repeatability, making it suitable for reliable 0.6V rail supervision in portable systems.
MAX6839XSD0+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- 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:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6839XSD0+T FAQ
1.How can I place an order for MAX6839XSD0+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6839XSD0+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 MAX6839XSD0+T reliable?
The price and inventory of MAX6839XSD0+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6839XSD0+T is usually 5 days.
3.What payment methods are accepted for MAX6839XSD0+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6839XSD0+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6839XSD0+T?
MAX6839XSD0+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6839XSD0+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 MAX6839XSD0+T?
For technical support, including MAX6839XSD0+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6839XSD0+T requirements.
6.How does Aetrix verify that MAX6839XSD0+T is sourced from the original manufacturer or authorized distributors?
All MAX6839XSD0+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 MAX6839XSD0+T meets industry standards.
7.What is the process for return or replacement of MAX6839XSD0+T?
All MAX6839XSD0+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6839XSD0+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 MAX6839XSD0+T part is unused and in its original packaging.
Return procedure for MAX6839XSD0+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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