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Analog Devices Inc./Maxim Integrated MAX6421XS16-T
- Part No.:
- MAX6421XS16-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-82A, SOT-343
- Datasheet:
-
MAX6421XS16-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-4
- Quantity:
- Payment:
- Shipping:
Inventory:13,475
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Product details
Overview
MAX6421XS16-T from Maxim Integrated is a low-power microprocessor reset supervisor IC in SC70-4 package, featuring an active-low push-pull RESET output, 1.575V ±1.5% factory-trimmed reset threshold (suffix '16'), and capacitor-adjustable reset timeout delay. It monitors VCC from 1.6V to 5V, asserts reset below threshold, and holds reset for a user-defined period after VCC recovers-enabling reliable power-up sequencing in battery-powered embedded controllers.
For engineers reviewing the MAX6421XS16-T datasheet, MAX6421XS16-T pinout, MAX6421XS16-T application, or MAX6421XS16-T equivalent, key selection criteria include its 1.575V reset threshold accuracy over -40°C to +125°C, 1.6µA typical quiescent current, guaranteed RESET validity down to VCC = 1V, and SC70-4 footprint compatibility with space-constrained portable designs.
Technical Context
The MAX6421XS16-T implements a precision voltage comparator with laser-trimmed internal reference and hysteresis (4×VTH), coupled to a 240nA constant-current ramp generator tied to the SRT pin. Reset assertion occurs when VCC falls below 1.575V; deassertion requires both VCC > 1.575V and the external capacitor (CSRT) charging to 0.65V via the ramp current.
This architecture delivers immunity to short VCC transients (e.g., ≤50µs for 100mV overdrive) and ensures monotonic reset timing across temperature (-40°C to +125°C), with reset timeout drift <±5% over full range when CSRT = 1500pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 1.575V ±1.5% (typical), factory-laser-trimmed for precise brownout detection at 1.6V systems |
| Quiescent Current | 1.6µA typical at +25°C - enables multi-year battery life in always-on monitoring circuits |
| RESET Output Type | Active-low push-pull - drives µP reset input directly without external pullup resistor |
| Valid VCC Range | 1.0V to 5.5V supply - guarantees functional RESET assertion/deassertion down to 1V VCC |
| Reset Timeout Control | Capacitor-adjustable via SRT pin: tRP = 2.73×10⁶ × CSRT + 275µs - supports 0.275ms to >100ms delays |
| VCC to RESET Delay | 80µs maximum - ensures fast response to supply collapse during power-down |
| Operating Temperature | -40°C to +125°C - qualified for automotive under-hood and industrial control environments |
Pinout & Package
MAX6421XS16-T is housed in a 4-pin SC70-4 package (outline 21-0098), with 0.65mm pitch, 1.25mm × 0.85mm body size, and thermal pad omitted. Pin 1 is marked by a dot or beveled corner.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | SRT | Set Reset Timeout input - connects to external capacitor (CSRT) to define reset hold time; sensitive to leakage and stray capacitance |
| 2 | GND | Ground reference for internal comparator, ramp generator, and output stage - must be low-impedance return path |
| 3 | RESET | Active-low push-pull reset output - sinks ≥500µA at VCC ≥1.8V, sources ≥200µA; directly interfaces µP reset pin |
| 4 | VCC | Supply voltage and monitored rail - powers device and serves as input to reset threshold comparator |
Key Features
| Feature | Design Value |
|---|---|
| Capacitor-adjustable reset timeout | Enables precise tailoring of reset hold time (0.275ms–100ms+) to match µP's internal power-on reset requirement |
| 1.6µA quiescent current | Reduces standby power draw in battery-backed systems - extends shelf life and operational runtime significantly |
| Guaranteed RESET validity to VCC = 1V | Ensures deterministic reset behavior during deep brownout, preventing spurious µP execution before stable supply |
| Immunity to short VCC transients | Rejects glitches ≤50µs at 100mV overdrive - eliminates false resets from switching noise or load dumps |
| Laser-trimmed 1.575V threshold | Delivers ±1.5% accuracy over temperature - removes need for external calibration or margining in 1.6V/1.8V logic rails |
Applications
| Portable Medical Sensors | Battery-Powered Industrial Controllers |
|---|---|
Use Scenario: Wearable ECG sensor operating from coin-cell battery with intermittent wake-up cycles. IC Role / Device Role / Timing Role: Monitors 1.8V LDO output; asserts active-low RESET on voltage sag below 1.575V to force controlled µP reboot before data corruption. Use Value: 1.6µA ICC prevents measurable battery drain during 99% sleep time; SC70-4 footprint fits sub-10mm² PCB area. |
Use Scenario: Remote RTU in oil-field telemetry system powered by LiSOCl₂ battery with 15-year lifespan requirement. IC Role / Device Role / Timing Role: Supervises 3.3V system rail; provides 100ms capacitor-set reset timeout to ensure FPGA configuration completes before µP initialization. Use Value: -40°C to +125°C rating and 1.575V threshold enable reliable operation in unheated enclosures; push-pull output eliminates pullup resistor BOM item. |
| Automotive Body Control Modules | Smart Energy Meters |
Use Scenario: Door module with LIN transceiver and MCU, exposed to cold-crank (4.5V) and load-dump (18V) events. IC Role / Device Role / Timing Role: Resets MCU if 5V supply drops below 1.575V during cranking; immune to ≤50µs transients per ISO 7637-2 Pulse 4. Use Value: Valid operation down to VCC = 1V ensures reset remains asserted until supply stabilizes post-cranking; SC70-4 aids automated assembly. |
Use Scenario: DIN-rail mounted meter with isolated DC-DC converter powering 3.3V logic, subject to grid sags and surges. IC Role / Device Role / Timing Role: Detects 1.6V brownout on 3.3V rail; holds µP in reset for 250ms (CSRT = 92nF) to allow analog front-end settling and EEPROM write completion. Use Value: Factory-trimmed threshold eliminates production test calibration; push-pull output avoids contention with isolated reset signaling paths. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor reset supervision applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6421US16-T | Same electrical specs and reset threshold, but in 4-pin SOT143-4 package (1.3mm × 1.5mm, 0.95mm pitch) | SOT143 offers slightly higher thermal mass and legacy board compatibility; SC70 preferred for ultra-compact layouts | Select MAX6421XS16-T for new designs prioritizing minimal footprint; choose MAX6421US16-T only if SOT143 land pattern exists. |
| TPS3123QDBVRQ1 | Automotive-grade (AEC-Q100), 1.6V threshold (±2%), fixed 200ms timeout, 2.5µA ICC, SOT23-5 | Fixed timeout lacks adjustability; AEC-Q100 qualification required for safety-critical automotive zones | Use TPS3123QDBVRQ1 where automotive qualification is mandatory and timeout flexibility is not needed; MAX6421XS16-T suits non-AEC designs requiring tunable delay. |
Compared with MAX6421US16-T, the MAX6421XS16-T saves 0.2mm² board area and improves high-frequency layout isolation for SRT; versus TPS3123QDBVRQ1, it trades AEC-Q100 compliance for capacitor-based timeout tuning and lower quiescent current-critical for energy harvesting and long-life battery systems.
Availability
MAX6421XS16-T is available at Aetrix Electronics and suitable for portable medical sensors, battery-powered industrial controllers, automotive body modules, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6421XS16-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, automotive, and computing applications.
The MAX6421 series belongs to Maxim's microprocessor supervisory product line, designed specifically for low-power, precision reset generation in space- and energy-constrained embedded systems with demanding environmental requirements.
FAQ
What is the exact reset threshold voltage of the MAX6421XS16-T?
The MAX6421XS16-T has a factory-laser-trimmed reset threshold of 1.575V, with ±1.5% accuracy over -40°C to +125°C and ±2.5% over the full temperature range. This value is confirmed in Table 1 of the datasheet (suffix '16') and applies specifically to the MAX6421XS16-T, not the broader MAX6421 family.
Does the MAX6421XS16-T require an external pullup resistor on the RESET pin?
No, the MAX6421XS16-T features an active-low push-pull RESET output, which actively drives both high and low states. Unlike open-drain variants (e.g., MAX6423), it does not require an external pullup resistor-reducing BOM count and eliminating potential weak-high issues in noisy environments.
How do I calculate the capacitor value needed for a specific reset timeout with the MAX6421XS16-T?
Use the formula CSRT = (tRP – 275µs) / 2.73×10⁶, where tRP is the desired reset timeout in seconds and CSRT is in farads. For example, a 100ms timeout requires CSRT = (0.1 – 0.000275) / 2.73×10⁶ ≈ 36.5nF. Ceramic capacitors with <10nA leakage are recommended for accuracy.
Is the MAX6421XS16-T qualified for automotive applications?
The MAX6421XS16-T is rated for -40°C to +125°C operation and meets industrial reliability standards, but it is not AEC-Q100 qualified. For automotive applications requiring formal qualification, consider alternatives like the TPS3123QDBVRQ1; the MAX6421XS16-T is suitable for non-safety-critical automotive subsystems where qualification is not mandated.
Can the MAX6421XS16-T operate reliably below 1.6V supply voltage?
Yes-the MAX6421XS16-T guarantees functional RESET assertion and deassertion down to VCC = 1.0V, as specified in the Absolute Maximum Ratings and Electrical Characteristics tables. However, RESET output drive strength degrades below 1.8V, and the device ceases to monitor VCC below 1.0V.
MAX6421XS16-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-82A, SOT-343
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.575V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- Adjustable/Selectable
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-4
MAX6421XS16-T FAQ
1.How can I place an order for MAX6421XS16-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6421XS16-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 MAX6421XS16-T reliable?
The price and inventory of MAX6421XS16-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6421XS16-T is usually 5 days.
3.What payment methods are accepted for MAX6421XS16-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6421XS16-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6421XS16-T?
MAX6421XS16-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6421XS16-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 MAX6421XS16-T?
For technical support, including MAX6421XS16-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6421XS16-T requirements.
6.How does Aetrix verify that MAX6421XS16-T is sourced from the original manufacturer or authorized distributors?
All MAX6421XS16-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 MAX6421XS16-T meets industry standards.
7.What is the process for return or replacement of MAX6421XS16-T?
All MAX6421XS16-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6421XS16-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 MAX6421XS16-T part is unused and in its original packaging.
Return procedure for MAX6421XS16-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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