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Analog Devices Inc./Maxim Integrated MAX6838XSD0-T
- Part No.:
- MAX6838XSD0-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6838XSD0-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:15,000
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Product details
Overview
MAX6838XSD0-T from Maxim Integrated is an ultra-low-voltage, 4-pin SC70 microprocessor supervisory circuit with adjustable reset threshold via RESET-IN input, push-pull active-high RESET output, and 70µs reset timeout period. It monitors supply voltages as low as 0.44V using an external resistive divider, consumes only 7.5µA typical supply current, and operates across –40°C to +85°C. It is used in portable/battery-powered equipment for reliable power-on reset and brownout protection.
For engineers reviewing the MAX6838XSD0-T datasheet, MAX6838XSD0-T pinout, MAX6838XSD0-T application, or MAX6838XSD0-T equivalent, key selection criteria include its 444mV internal reference, ±3.0% RESET-IN threshold accuracy over temperature, guaranteed reset validity down to VCC = 0.75V, and compatibility with low-noise, low-power embedded systems requiring precise voltage monitoring and manual reset independence.
Technical Context
The MAX6838XSD0-T implements a high-impedance comparator architecture where the RESET-IN pin (typical threshold 444mV) serves as the sole monitored input-VCC is not sensed for reset assertion. Reset is asserted when RESET-IN falls below threshold and remains active for exactly 70µs after RESET-IN rises above threshold.
Its push-pull active-high RESET output drives high with VOH ≥ 0.8×VCC (at ISOURCE = 10µA, VCC ≥ 0.85V) and sinks no current during reset deassertion; it requires no external pullup. The device features immunity to short negative VCC transients and guarantees operation with VCC as low as 1.1V for accurate RESET-IN threshold tracking.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Timeout Period | 70µs - fixed, shortest available delay; suitable for fast power-up sequencing and voltage glitch detection. |
| RESET-IN Threshold | 444mV ±3.0% - stable reference enabling precise external voltage monitoring down to ~0.44V with resistor divider. |
| Supply Current | 7.5µA (typ) at VCC = 1.2V - enables multi-year battery life in always-on portable monitoring circuits. |
| VCC Operating Range | 1.1V to 3.3V - supports modern ultra-low-voltage SoCs while ensuring RESET-IN accuracy and output drive capability. |
| Reset Output Type | Push-pull, active-high - eliminates need for external pullup; provides rail-to-rail logic-compatible RESET signal. |
| Temperature Range | –40°C to +85°C - qualified for industrial and extended commercial environments without derating. |
| RESET Validity Limit | VCC ≥ 0.75V - ensures RESET remains valid and actively driven even during deep brownout conditions. |
Pinout & Package
MAX6838XSD0-T is housed in a 4-pin SC70-4 package (2.0mm × 2.1mm, 0.65mm pitch), optimized for space-constrained portable designs. 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 comparator input; connects to external resistive divider to set custom reset threshold (e.g., 0.6V monitored supply → R1/R2 network referenced to 444mV). |
| 2 | VCC | Power supply input (1.1V–3.3V); powers internal circuitry and defines VOH/ VOL levels; must be ≥1.1V for RESET-IN accuracy guarantee. |
| 3 | GND | Analog and digital ground reference; must be low-impedance connection to minimize noise coupling into RESET-IN path. |
| 4 | RESET | Push-pull active-high output; drives high to VCC during reset assertion; sinks no current when deasserted; interfaces directly with µP reset inputs without pullup. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset Threshold | Enabled via RESET-IN pin with 444mV internal reference; allows monitoring of supply voltages from 0.44V to 3.3V using external resistors. |
| Ultra-Low Quiescent Current | 7.5µA typical - reduces system standby power by >90% vs. legacy reset ICs, critical for coin-cell or energy-harvesting applications. |
| Short Fixed Timeout | 70µs propagation delay - ensures rapid response to transient faults while avoiding false resets from brief supply dips. |
| Reset Validity at Low VCC | Guaranteed RESET functionality down to VCC = 0.75V - maintains deterministic behavior during deep brownout recovery. |
| Transient Immunity | Immune to negative VCC glitches <100ns wide at 100mV overdrive - suppresses noise-induced spurious resets in noisy PCB environments. |
Applications
| Wearable Health Monitor | IoT Edge Sensor Node |
|---|---|
|
Use Scenario: A compact wearable ECG patch powered by a 1.2V Li-SOCl₂ battery must initiate clean boot on power-up and detect brownout before sensor ADC sampling begins. IC Role / Device Role / Timing Role: MAX6838XSD0-T acts as the primary power supervisor, asserting RESET until the regulated 1.2V rail stabilizes and the 444mV reference confirms valid voltage at the battery monitor divider output. Use Value: Its 70µs timeout and 7.5µA current ensure sub-millisecond boot readiness and multi-year shelf life without compromising reset reliability. |
Use Scenario: An LPWAN soil moisture sensor uses a 1.5V energy-harvesting capacitor and wakes every 15 minutes to take readings; voltage sag during RF transmission must not corrupt MCU state. IC Role / Device Role / Timing Role: MAX6838XSD0-T continuously monitors the harvested rail via RESET-IN, triggering active-high RESET within 70µs if voltage drops below 1.35V (set by R1/R2), halting transmission mid-burst. Use Value: Adjustable threshold and low VCC operation (down to 0.75V) allow robust reset assertion even as capacitor discharges to near-depletion. |
| Industrial PLC I/O Module | Medical Infusion Pump Controller |
|
Use Scenario: A DIN-rail mounted PLC module with isolated 1.8V logic rails must survive 200ms AC line sags without firmware corruption or relay chatter. IC Role / Device Role / Timing Role: MAX6838XSD0-T supervises the 1.8V rail using a precision divider on RESET-IN; its ±3.0% threshold accuracy over –40°C to +85°C ensures consistent trip point across operating environments. Use Value: Push-pull RESET output drives the MCU's reset pin directly-no pullup required-reducing BOM count and eliminating weak-state uncertainty during cold start. |
Use Scenario: A battery-backed infusion pump controller must guarantee safe shutdown and restart if main 1.2V core supply dips during motor activation or EMI events. IC Role / Device Role / Timing Role: MAX6838XSD0-T monitors the 1.2V core via RESET-IN, asserting RESET within 70µs of threshold breach and holding it for full timeout-even as VCC collapses toward 0.75V. Use Value: Guaranteed reset validity to 0.75V prevents metastability in safety-critical reset signaling, satisfying IEC 62304 Class C software requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage supervisor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6381XR24-T | Fixed 2.4V reset threshold; 200ms timeout; SC70-3 package; no RESET-IN or MR. | Suitable only for higher-voltage systems; lacks adjustability and short timeout. | Select when monitoring 2.4V+ rails and design simplicity outweighs configurability needs. |
| TPS3808G01DBVR | Fixed 0.9V threshold; 20ms timeout; SOT-23-5; includes MR input; 1.5µA IQ. | Lower quiescent current but longer timeout; MR support adds flexibility; different pinout. | Prefer for ultra-low-power apps needing manual reset, but verify 20ms delay meets timing budget. |
Compared with MAX6838XSD0-T, MAX6381XR24-T offers fixed-threshold simplicity at higher voltage, while TPS3808G01DBVR trades adjustability for lower IQ and MR capability-neither matches the unique combination of 444mV reference, 70µs response, and push-pull active-high output in SC70-4.
Availability
MAX6838XSD0-T is available at Aetrix Electronics and suitable for portable/battery-powered equipment, industrial PLC I/O modules, and medical infusion pump controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6838XSD0-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 microprocessor supervision in space- and power-constrained systems, emphasizing sub-1V monitoring capability, nanoscale leakage control, and SC70 footprint efficiency.
FAQ
What is the exact reset timeout period of the MAX6838XSD0-T?
The MAX6838XSD0-T has a fixed reset active timeout period of 70µs, corresponding to the "D0" suffix in its ordering code. This value is guaranteed over the full –40°C to +85°C temperature range and represents the minimum time RESET remains asserted after RESET-IN rises above the 444mV threshold. It is the shortest available timeout in the MAX6832–MAX6840 family and is optimized for fast power-up sequencing and transient rejection.
How does the RESET-IN pin function in the MAX6838XSD0-T?
The RESET-IN pin of the MAX6838XSD0-T is a high-impedance input (±25nA leakage) that connects to an external resistive divider network to set the monitored voltage threshold. The internal comparator compares RESET-IN to a 444mV reference; reset asserts when RESET-IN falls below this value. For example, to monitor a 1.2V rail, use R1 = 165kΩ and R2 = 100kΩ (1.2V × 100kΩ / 444mV ≈ 165kΩ). VCC must be ≥1.1V for ±3.0% threshold accuracy.
What is the minimum VCC required for the MAX6838XSD0-T to guarantee RESET output validity?
The MAX6838XSD0-T guarantees valid push-pull active-high RESET output down to VCC = 0.75V. Below this level, VOH specifications degrade and the output may not reliably drive CMOS inputs. This specification ensures deterministic reset behavior during deep brownout conditions common in battery-powered systems. Note that RESET-IN accuracy is only guaranteed for VCC ≥ 1.1V.
Does the MAX6838XSD0-T require an external pullup resistor on the RESET pin?
No, the MAX6838XSD0-T does not require an external pullup resistor on the RESET pin because it features a push-pull active-high output stage. The output actively drives high to VCC during reset assertion and presents high impedance (not open-drain) when deasserted. This eliminates BOM components, reduces layout complexity, and avoids weak-state uncertainty-unlike open-drain alternatives such as the MAX6840.
Can the MAX6838XSD0-T monitor a 0.6V supply rail?
Yes, the MAX6838XSD0-T can monitor a 0.6V supply rail using the RESET-IN pin. With the internal 444mV reference, a simple two-resistor divider (e.g., R2 = 200kΩ, R1 = 70.3kΩ) sets the trip point at 0.6V. The device's low leakage (<25nA) enables use of high-value resistors, minimizing current draw. However, VCC must be ≥1.1V to maintain RESET-IN threshold accuracy per the datasheet.
MAX6838XSD0-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- 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 Low
- Reset Timeout:
- 70µs Typical
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6838XSD0-T FAQ
1.How can I place an order for MAX6838XSD0-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6838XSD0-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 MAX6838XSD0-T reliable?
The price and inventory of MAX6838XSD0-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6838XSD0-T is usually 5 days.
3.What payment methods are accepted for MAX6838XSD0-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6838XSD0-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6838XSD0-T?
MAX6838XSD0-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6838XSD0-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 MAX6838XSD0-T?
For technical support, including MAX6838XSD0-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6838XSD0-T requirements.
6.How does Aetrix verify that MAX6838XSD0-T is sourced from the original manufacturer or authorized distributors?
All MAX6838XSD0-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 MAX6838XSD0-T meets industry standards.
7.What is the process for return or replacement of MAX6838XSD0-T?
All MAX6838XSD0-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6838XSD0-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 MAX6838XSD0-T part is unused and in its original packaging.
Return procedure for MAX6838XSD0-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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