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Analog Devices Inc./Maxim Integrated MAX6838XSD1+T
- Part No.:
- MAX6838XSD1+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6838XSD1+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:4,943
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Product details
Overview
MAX6838XSD1+T from Maxim Integrated is an ultra-low-voltage, adjustable-threshold microprocessor reset circuit in a 4-pin SC70 package. It monitors external supply voltages via RESET-IN (typical threshold 444mV), provides push-pull active-high RESET output, and features a 1.5ms reset timeout period. Designed for low-power portable systems with 1.1V–3.3V VCC, it ensures reliable power-on reset during brownout conditions in battery-powered microcontroller applications.
For engineers reviewing the MAX6838XSD1+T datasheet, MAX6838XSD1+T pinout, MAX6838XSD1+T application, or MAX6838XSD1+T equivalent, this page delivers verified electrical parameters, exact SC70-4 terminal mapping, confirmed reset timing behavior, and validated alternative options for low-voltage supervisory design.
Technical Context
The MAX6838XSD1+T uses an internal 444mV reference to compare externally divided supply voltage at RESET-IN; reset assertion occurs when that input falls below threshold. Its push-pull active-high RESET output drives high with VOH ≥ 0.8×VCC across full operating range (VCC = 1.1V–3.3V) and remains asserted for exactly 1.5ms after RESET-IN rises above threshold.
No manual reset (MR) input is present - unlike MAX6835/MAX6836/MAX6837 - and VCC is not monitored directly; only RESET-IN determines reset state. The device operates from -40°C to +85°C with ±3.0% RESET-IN threshold accuracy and draws only 7.5µA typical supply current at 1.8V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Timeout Period | 1.5ms - fixed delay ensures µP reset signal meets minimum assertion time for reliable boot initialization |
| RESET-IN Threshold | 444mV (±3.0%) - enables precise monitoring of supplies as low as 0.44V using external resistor divider |
| Supply Voltage Range | 1.1V to 3.3V - supports core logic supplies while enabling accurate RESET-IN sensing |
| Supply Current | 7.5µA (typ at 1.8V) - minimizes quiescent drain in always-on battery backup paths |
| RESET Output Type | Push-pull active-high - eliminates need for external pullup and ensures defined logic level during reset assertion |
| Operating Temperature | -40°C to +85°C - qualified for industrial-grade embedded and portable equipment environments |
| Package | SC70-4 - 1.25mm × 1.25mm footprint enables space-constrained PCB layouts |
Pinout & Package
MAX6838XSD1+T is housed in a 4-pin SC70-4 package (1.25mm × 1.25mm, 0.65mm pitch), RoHS-compliant with "+T" suffix indicating lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET-IN | High-impedance analog input for external voltage divider; reset asserts when voltage falls below 444mV |
| 2 | VCC | Power supply input (1.1V–3.3V); powers internal circuitry and defines VOH/ VOL levels |
| 3 | GND | Ground reference for all internal comparators and output drivers |
| 4 | RESET | Push-pull active-high output; drives high during reset assertion, low otherwise; no external pullup required |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset Threshold | Set via external resistor divider on RESET-IN - supports custom trip points from 0.44V upward without changing IC |
| Low Quiescent Current | 7.5µA typical - extends battery life in always-connected portable devices such as wearables and IoT sensors |
| Precision Threshold Accuracy | ±3.0% over -40°C to +85°C - eliminates need for calibration in production test for most industrial applications |
| Guaranteed Operation Down to VCC = 1.1V | Ensures valid RESET output even when system supply sags near LDO dropout limits |
| Immunity to Short VCC Transients | Rejects <100ns negative glitches - prevents spurious resets in electrically noisy environments |
Applications
| Wearable Health Monitor | Industrial Sensor Node |
|---|---|
Use Scenario: A wrist-worn ECG sensor powered by a single 1.5V alkaline cell must maintain valid reset signaling as battery voltage declines from 1.5V to 0.9V. IC Role / Device Role / Timing Role: MAX6838XSD1+T monitors battery via resistor divider on RESET-IN and asserts active-high RESET for 1.5ms to initialize the MCU upon undervoltage condition. Use Value: Enables deterministic boot recovery at sub-1.2V supply levels where fixed-threshold supervisors fail, extending usable battery life by ~18%. |
Use Scenario: A wireless temperature node uses a 1.2V LDO to power its MCU and RF transceiver; supply ripple and load transients risk false resets. IC Role / Device Role / Timing Role: MAX6838XSD1+T senses the regulated 1.2V rail through RESET-IN and provides glitch-immune reset assertion with 1.5ms hold time. Use Value: Prevents firmware lockup during transient dips caused by RF transmit bursts, improving field reliability without adding bulk capacitance. |
| Medical Diagnostic Handheld | Smart Energy Meter |
Use Scenario: A portable blood glucose meter employs a 1.8V core supply but requires reset detection at 1.35V to prevent corrupted EEPROM writes during battery depletion. IC Role / Device Role / Timing Role: MAX6838XSD1+T's RESET-IN pin is biased to 1.35V using R1/R2 divider; asserts RESET when supply drops below trip point. Use Value: Guarantees safe shutdown before critical memory operations execute under marginal voltage, meeting IEC 62304 safety requirements. |
Use Scenario: An electricity meter with dual-supply architecture (3.3V I/O, 1.2V core) needs independent reset control for the 1.2V domain without sharing VCC monitoring. IC Role / Device Role / Timing Role: MAX6838XSD1+T monitors only the 1.2V core rail via RESET-IN while powered from same rail, isolating reset behavior from I/O supply noise. Use Value: Eliminates cross-domain coupling in reset assertion, ensuring core logic resets independently of communication interface stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6836XSD1+T | Fixed-threshold (1.575V) with MR input; push-pull active-high RESET; same 1.5ms timeout and SC70-4 package | Requires direct VCC monitoring instead of adjustable RESET-IN; includes debounced manual reset capability | Select when system uses stable 1.5V–1.6V supply and requires hardware reset button support |
| MAX6381XR29+T | Fixed 2.93V threshold; 140ms timeout; SC70-3 package; no RESET-IN or MR; 1.0µA supply current | Designed for higher-voltage rails only; lacks adjustability and manual reset; smaller footprint but incompatible pinout | Choose only for cost-sensitive 3V systems where long timeout and ultra-low current outweigh need for flexibility |
Compared with MAX6838XSD1+T, MAX6836XSD1+T offers manual reset and fixed VCC monitoring but loses adjustable threshold capability, while MAX6381XR29+T trades adjustability and timeout flexibility for lower current and simpler integration in higher-voltage designs.
Availability
MAX6838XSD1+T is available at Aetrix Electronics and suitable for portable medical devices, industrial sensor nodes, wearable electronics, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6838XSD1+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 precision analog, mixed-signal, and power management ICs for industrial, automotive, and computing applications.
The MAX6832–MAX6840 family was designed specifically for ultra-low-voltage microprocessor supervision in space- and power-constrained portable systems, emphasizing accuracy, low ICC, and flexible threshold configuration.
FAQ
What is the exact reset timeout period for MAX6838XSD1+T?
The MAX6838XSD1+T has a fixed reset active timeout period of 1.5ms, as indicated by the "D1" suffix in its ordering code. This duration is guaranteed over the full -40°C to +85°C operating temperature range and ensures sufficient reset assertion time for reliable microprocessor initialization. The 1.5ms value is factory-trimmed and does not require external components or configuration.
Does MAX6838XSD1+T monitor VCC directly or only RESET-IN?
The MAX6838XSD1+T monitors only the RESET-IN pin - not VCC - to determine reset assertion. VCC serves solely as the power supply for internal circuitry and defines output drive strength. Reset is asserted when RESET-IN falls below the internal 444mV reference, regardless of VCC level (as long as VCC remains within 1.1V–3.3V). This decouples monitoring from supply rail selection.
Can MAX6838XSD1+T be used with a 0.9V monitored supply?
Yes - MAX6838XSD1+T supports monitored supplies as low as 0.44V via RESET-IN. For a 0.9V trip point, use R1 = R2 × ((0.9V / 0.444V) − 1); with R2 = 200kΩ, R1 ≈ 206kΩ. Note that VCC must remain ≥1.1V to guarantee RESET-IN threshold accuracy per the datasheet Electrical Characteristics table.
What is the maximum sink/source capability of the MAX6838XSD1+T RESET output?
The MAX6838XSD1+T RESET output is push-pull active-high and guarantees VOH ≥ 0.8×VCC when sourcing 10µA (at VCC ≥ 0.85V) and VOL ≤ 0.2×VCC when sinking 80µA (at VCC ≥ 1.0V). It does not specify absolute current limits beyond these test conditions, but typical operation into CMOS inputs draws <1µA, making it compatible with standard µP reset inputs.
Is there a manual reset (MR) input on MAX6838XSD1+T?
No - MAX6838XSD1+T does not include a manual reset (MR) input. It belongs to the RESET-IN variant group (alongside MAX6839/MAX6840), which replaces MR functionality with the adjustable threshold input. If manual reset capability is required, consider MAX6836XSD1+T, which shares the same package, timeout, and output type but adds a debounced MR pin.
MAX6838XSD1+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:
- 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:
- 1ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6838XSD1+T FAQ
1.How can I place an order for MAX6838XSD1+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6838XSD1+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 MAX6838XSD1+T reliable?
The price and inventory of MAX6838XSD1+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6838XSD1+T is usually 5 days.
3.What payment methods are accepted for MAX6838XSD1+T?
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4.How is shipping managed for MAX6838XSD1+T?
MAX6838XSD1+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6838XSD1+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 MAX6838XSD1+T?
For technical support, including MAX6838XSD1+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6838XSD1+T requirements.
6.How does Aetrix verify that MAX6838XSD1+T is sourced from the original manufacturer or authorized distributors?
All MAX6838XSD1+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 MAX6838XSD1+T meets industry standards.
7.What is the process for return or replacement of MAX6838XSD1+T?
All MAX6838XSD1+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6838XSD1+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 MAX6838XSD1+T part is unused and in its original packaging.
Return procedure for MAX6838XSD1+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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