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Analog Devices Inc./Maxim Integrated MAX6301ESA
- Part No.:
- MAX6301ESA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6301ESA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,817
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Product details
Overview
The MAX6301ESA from Maxim Integrated is an industrial-grade, low-power microprocessor supervisory circuit with active-low open-drain reset output, adjustable reset threshold (≥1.22V), adjustable reset timeout (via external capacitor on SRT), and adjustable watchdog timeout with 500× extension mode (via WDS pin). It operates from +2V to +5.5V, draws only 4µA supply current, and is used in battery-powered medical equipment and embedded controllers requiring reliable brownout and hang detection.
For engineers reviewing the MAX6301ESA datasheet, MAX6301ESA pinout, MAX6301ESA application, or MAX6301ESA equivalent, key selection considerations include its -40°C to +85°C temperature range, SO-8 package, open-drain active-low RESET output, VCC monitoring capability with external resistor divider, and dual-mode watchdog timing controlled by WDS voltage level.
Technical Context
The MAX6301ESA implements a precision bandgap-based reset comparator referenced to 1.22V, with hysteresis of 20mV and input leakage <±1nA. Its reset assertion is guaranteed down to VCC = 1V, and it features immunity to negative-going VCC transients ≤50µs at 100mV overdrive.
Watchdog operation uses two independent precision current sources (500nA) on SWT and SRT pins to charge external capacitors; timing is linearly scalable (tWD = 2.67 × CSWT in µs for normal mode, ×500 when WDS = VCC). The WDI input detects >30ns transitions and clears the timer on any edge.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2V to +5.5V - supports standard 3.3V/5V systems and brownout detection down to 2V |
| Quiescent Current | 4.0µA typical - enables multi-year battery life in portable medical and sensor devices |
| Reset Threshold Accuracy | 1.220V ±25mV at +25°C - sets precise power-fail detection point via external R1/R2 divider |
| Reset Timeout Range | 2.8ms to 5.2ms with 1500pF on SRT - configurable reset hold time for diverse µP boot sequences |
| Watchdog Timeout (Normal) | 2.8ms to 5.2ms with 1500pF on SWT - software watchdog window for real-time task supervision |
| Watchdog Timeout (Extended) | 1.4s to 2.6s with 1500pF on SWT and WDS = VCC - enables ultra-low-power wake-up timer applications |
| Operating Temperature | -40°C to +85°C - qualified for industrial and automotive-adjacent embedded environments |
Pinout & Package
MAX6301ESA is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, with 1.27mm pitch and RoHS-compliant lead-free option available.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | High-impedance reset threshold reference input | Connects to center tap of external R1/R2 divider; sets VRST = 1.22 × (R1+R2)/R2 |
| 2 - GND | Ground reference | Common return path for all internal circuits and external timing capacitors |
| 3 - SRT | Reset timeout capacitor connection | Sinks 500nA to ground; tRP = 2.67 × CSRT (pF) in µs - requires low-leakage ceramic cap |
| 4 - SWT | Watchdog timeout capacitor connection | Sinks 500nA to ground; tWD = 2.67 × CSWT (pF) in µs - same capacitor requirements as SRT |
| 5 - WDS | Watchdog mode select input | GND = normal mode (ms timeout); VCC = extended mode (×500, s timeout); edge-triggered reset |
| 6 - WDI | Watchdog input | Rising/falling edge resets watchdog timer; detects pulses ≥30ns; high-Z in normal mode |
| 7 - RESET | Active-low open-drain reset output | Pulled low during reset assertion; requires external pullup; compatible with bidirectional µP reset pins |
| 8 - VCC | Positive supply input | Bypass with 0.1µF ceramic capacitor close to pin; powers all internal circuitry and timing references |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Set to any voltage ≥1.22V using two external resistors - eliminates need for fixed-threshold variants |
| 500× watchdog timeout multiplier | WDS pin selects between ms-scale hang detection and s-scale wake-up timer - single device serves dual roles |
| Power-supply transient immunity | Rejects VCC glitches ≤50µs duration at 100mV overdrive - prevents spurious resets in noisy environments |
| Guaranteed reset assertion at VCC ≥1V | Ensures valid reset signal during power-up/down even below typical logic thresholds - critical for robust boot sequencing |
| Open-drain active-low RESET output | Enables wired-OR reset bus and direct interface with bidirectional µP reset I/O (e.g., 68HC11) without level-shifting |
Applications
| Medical Patient Monitor | Industrial Data Logger |
|---|---|
Use Scenario: Portable ECG monitor powered by coin-cell battery, entering deep sleep between measurements. IC Role / Device Role / Timing Role: MAX6301ESA acts as wake-up timer and brownout protector: WDS driven high to enable extended watchdog mode, triggering periodic reset to awaken µP. Use Value: Achieves multi-month battery life by eliminating continuous µP operation while guaranteeing safe restart after voltage sag. | Use Scenario: Remote environmental sensor node logging temperature/humidity every 10 minutes in unattended field deployment. IC Role / Device Role / Timing Role: MAX6301ESA monitors main 3.3V rail and asserts RESET if voltage drops below 2.9V; also supervises µP firmware execution via WDI. Use Value: Prevents corrupted data writes during brownout and recovers hung firmware without manual intervention. |
| Point-of-Care Diagnostic Device | Smart Energy Meter |
Use Scenario: Handheld blood glucose analyzer with LCD display and USB charging, requiring fail-safe boot under variable input conditions. IC Role / Device Role / Timing Role: MAX6301ESA provides power-on reset with 4ms timeout and monitors USB-charged battery voltage via RESET IN divider. Use Value: Ensures deterministic µP initialization regardless of charger ripple or battery state, meeting IEC 62304 safety requirements. | Use Scenario: DIN-rail mounted electricity meter operating continuously from 230VAC-derived 3.3V supply in electrically noisy utility substations. IC Role / Device Role / Timing Role: MAX6301ESA detects rapid VCC dips caused by switching transients and asserts RESET only after sustained undervoltage (>4ms). Use Value: Eliminates false resets from grid harmonics while maintaining response to genuine supply failures per ANSI C12.1. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6303ESA | Push-pull active-low RESET output (vs. open-drain); identical timing, threshold, and temperature specs | Eliminates need for external pullup resistor; not suitable for wired-OR reset buses or bidirectional µP interfaces | Select MAX6303ESA when board layout simplification and reduced component count outweigh bus-sharing requirements. |
| TPS3808G125DBVR | Fixed 1.25V reset threshold; 1.8–6V supply range; 1.8µA quiescent current; no watchdog extension mode | Lacks adjustable threshold and 500× watchdog scaling; optimized for ultra-low-power always-on monitoring, not wake-up timer use | Select TPS3808G125DBVR when fixed threshold suffices and sub-2µA supply current is mandatory for >10-year battery life. |
Compared with MAX6303ESA, the MAX6301ESA offers open-drain flexibility for system-level reset arbitration but requires a pullup; compared with TPS3808G125DBVR, it trades lower quiescent current for full adjustability and extended watchdog functionality essential for programmable wake-up timing.
Availability
MAX6301ESA is available at Aetrix Electronics and suitable for medical equipment, industrial data loggers, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6301ESA 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 and mixed-signal ICs for industrial, medical, and communications applications, emphasizing reliability, low power, and integration.
The MAX6301–MAX6304 family was engineered specifically for microprocessor supervision in space-constrained, battery-sensitive systems where adjustable reset and watchdog timing eliminate design compromises across voltage rails and firmware architectures.
FAQ
What is the minimum VCC required for guaranteed RESET assertion in MAX6301ESA?
The MAX6301ESA guarantees RESET output remains asserted (low) for VCC ≥ 1V. Below 1V, output drive capability degrades; for applications requiring valid reset down to 0V, a 100kΩ pulldown resistor on the RESET pin is recommended. This behavior is confirmed in the Electrical Characteristics table and Detailed Description section of the MAX6301ESA datasheet.
Can MAX6301ESA monitor a voltage other than VCC, such as a 3.3V auxiliary rail?
Yes, the MAX6301ESA can monitor any DC voltage via the RESET IN pin using an external resistor divider. For example, to monitor a 3.3V rail at 2.8V threshold, set R1 = 432kΩ and R2 = 1MΩ to achieve VRST = 1.22 × (432k + 1M)/1M ≈ 2.8V. The pin's ±1nA leakage ensures minimal error, and Figure 4 in the MAX6301ESA datasheet explicitly shows this configuration.
How does the WDS pin affect watchdog behavior in MAX6301ESA?
In MAX6301ESA, the WDS pin selects watchdog mode: grounded = normal mode (tWD in ms), tied to VCC = extended mode (tWD × 500, yielding seconds). A transition on WDS immediately clears and restarts the watchdog timer. Extended mode also allows watchdog disable by leaving WDI unconnected, as the internal driver pulses WDI near timeout - a feature documented in the Watchdog Timer section of the MAX6301ESA datasheet.
What capacitor type and value are recommended for SRT and SWT pins on MAX6301ESA?
MAX6301ESA requires low-leakage (<10nA) ceramic capacitors on SRT and SWT. For a 4ms reset timeout, use CSRT = 4000µs / 2.67 ≈ 1500pF; for 4ms normal-mode watchdog, use identical CSWT = 1500pF. X7R or C0G dielectrics are preferred; avoid electrolytics or high-leakage types, as specified in the Applications Information section of the MAX6301ESA datasheet.
Is MAX6301ESA pin-compatible with other members of the MAX6301–MAX6304 family?
Yes, all MAX6301–MAX6304 variants share identical 8-pin SO, PDIP, and µMAX packages and pinouts - including MAX6301ESA, MAX6302ESA, MAX6303ESA, and MAX6304ESA. Differences are limited to reset polarity (active-low/high) and output structure (open-drain/push-pull), as confirmed in the Selector Guide and Pin Configuration diagrams of the MAX6301ESA datasheet.
MAX6301ESA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active Low
- Reset Timeout:
- 2.8ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX6301ESA FAQ
1.How can I place an order for MAX6301ESA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6301ESA 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 MAX6301ESA reliable?
The price and inventory of MAX6301ESA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6301ESA is usually 5 days.
3.What payment methods are accepted for MAX6301ESA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6301ESA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6301ESA?
MAX6301ESA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6301ESA 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 MAX6301ESA?
For technical support, including MAX6301ESA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6301ESA requirements.
6.How does Aetrix verify that MAX6301ESA is sourced from the original manufacturer or authorized distributors?
All MAX6301ESA 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 MAX6301ESA meets industry standards.
7.What is the process for return or replacement of MAX6301ESA?
All MAX6301ESA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6301ESA, 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 MAX6301ESA part is unused and in its original packaging.
Return procedure for MAX6301ESA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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