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Analog Devices Inc./Maxim Integrated MAX6301ESA+T
- Part No.:
- MAX6301ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6301ESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,142
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Product details
Overview
MAX6301ESA+T from Maxim Integrated is an adjustable low-power microprocessor supervisory circuit with open-drain active-low reset output, 4µA supply current, 1.22V internal reference, and configurable reset/watchdog timeout via external capacitors. It operates from +2V to +5.5V and supports industrial temperature range (–40°C to +85°C), used in battery-powered medical equipment and embedded controllers requiring reliable brownout detection and watchdog supervision.
For engineers reviewing the MAX6301ESA+T datasheet, MAX6301ESA+T pinout, MAX6301ESA+T application, or MAX6301ESA+T equivalent, key selection criteria include its adjustable reset threshold (≥1.22V), guaranteed RESET assertion down to VCC = 1V, 500× watchdog timeout multiplier via WDS pin, power-supply transient immunity, and SO-8 RoHS-compliant packaging.
Technical Context
The MAX6301ESA+T implements a precision voltage-monitoring comparator with 1.22V bandgap reference and 20mV hysteresis, enabling user-defined reset thresholds via external resistor dividers on RESET IN. Its reset timeout (tRP) and watchdog timeout (tWD) are set by external capacitors on SRT and SWT pins using a 2.67 µs/pF timing constant.
It features dual-mode watchdog operation: normal mode (WDS = GND, tWD in ms) and extended mode (WDS = VCC, tWD × 500 up to ~22 minutes). The open-drain RESET output ensures compatibility with bidirectional µP reset pins and allows wired-OR configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2V to +5.5V - supports 3.3V and 5V systems; valid operation down to 2V ensures robustness during brownout. |
| Quiescent Current | 4.0 µA typical - enables multi-year battery life in portable medical and IoT devices. |
| Reset Threshold Reference | 1.22V ±2.5% - stable bandgap reference used with external resistors to set custom reset voltages ≥1.22V. |
| Reset Timeout Range | 2.8–5.2 ms (CSRT = 1500pF) - programmable via capacitor; timing constant 2.67 µs/pF allows µs-to-ms adjustment. |
| Watchdog Timeout (Normal) | 2.8–5.2 ms (CSWT = 1500pF) - same timing constant as reset; enables tight software execution monitoring. |
| Watchdog Timeout (Extended) | 1.4–2.6 s (CSWT = 1500pF, WDS = VCC) - 500× multiplication enables long sleep/wake cycles without CPU intervention. |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive-adjacent embedded applications. |
Pinout & Package
MAX6301ESA+T is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, RoHS-compliant and lead(Pb)-free. Pin 1 is marked with a beveled corner or dot; device orientation follows standard SO-8 top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | High-impedance reset threshold input | Connects to center tap of external R1/R2 divider; sets VRST = 1.22 × (R1 + R2)/R2; leakage < ±1 nA avoids threshold error. |
| 2 - GND | Analog and digital ground reference | Common return for all internal circuits; must be low-impedance and decoupled near VCC pin. |
| 3 - SRT | Reset timeout capacitor connection | Drives 500nA precision current source; CSRT value directly sets tRP = 2.67 × CSRT (pF → µs). |
| 4 - SWT | Watchdog timeout capacitor connection | Drives identical 500nA current source; CSWT sets basic tWD; leakage <10nA required for accuracy. |
| 5 - WDS | Watchdog mode select control | Logic high (VCC) enables 500× timeout extension; logic low (GND) selects normal mode; edge-triggered reset of timer. |
| 6 - WDI | Watchdog input trigger | Rising/falling edge resets watchdog timer; minimum pulse width 30ns; high-impedance in normal mode, driven in extended mode. |
| 7 - RESET | Open-drain active-low reset output | Pulled low during reset assertion; requires external pullup; compatible with bidirectional µP reset I/O (e.g., 68HC11). |
| 8 - VCC | Positive supply input | Must be bypassed with 0.1µF ceramic capacitor placed adjacent to pin; guarantees RESET assertion at VCC ≥ 1V. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Settable to any voltage ≥1.22V using two external resistors; eliminates need for fixed-threshold supervisors in multi-rail systems. |
| Capacitor-programmable timeouts | Independent SRT/SWT pins enable precise, board-level tuning of reset and watchdog periods without firmware changes. |
| 500× watchdog timeout multiplier | WDS pin toggles between ms-scale (normal) and second/minute-scale (extended) timeouts - ideal for low-power wake-up timers. |
| Power-supply transient immunity | Withstands negative VCC transients ≤50µs at 100mV overdrive without false reset - critical for noisy industrial power rails. |
| Guaranteed reset at low VCC | RESET asserted and held valid down to VCC = 1V - ensures reliable initialization during slow power ramps or battery sag. |
Applications
| Medical Patient Monitor | Industrial PLC Controller |
|---|---|
Use Scenario: Portable ECG monitor powered by coin-cell battery with intermittent sensor sampling and BLE transmission. IC Role / Device Role: Supervises main µP (e.g., ARM Cortex-M0+) and triggers hardware reset if firmware hangs or supply drops below 2.7V. Use Value: 4µA quiescent current extends battery life >3 years; adjustable reset threshold matches Li-ion discharge curve; extended watchdog enables 10-minute sleep cycles. |
Use Scenario: DIN-rail mounted programmable logic controller operating in factory environments with 24VDC supply and EMI noise. IC Role / Device Role: Monitors 3.3V logic rail derived from switching regulator; asserts reset during brownout or µP lockup detected via WDI polling. Use Value: Transient immunity prevents spurious resets from motor drive noise; SO-8 package withstands thermal cycling; –40°C to +85°C rating ensures reliability in uncontrolled cabinets. |
| Handheld Barcode Scanner | Smart Energy Meter |
Use Scenario: Battery-operated scanner with aggressive power management: µP sleeps >95% of time, wakes on button press or laser activation. IC Role / Device Role: Generates wake-up pulse via extended watchdog timeout; provides clean reset on power-up and brownout. Use Value: WDS-driven mode switching enables µP to self-configure wake interval; open-drain RESET interfaces directly with bidirectional reset pin on scan engine SoC. |
Use Scenario: ANSI C12.19-compliant meter with isolated MCU, RTC, and metrology ASIC, requiring fail-safe boot and runtime supervision. IC Role / Device Role: Monitors both 3.3V MCU rail and 5V analog front-end rail via separate resistor dividers; provides independent reset assertion per rail. Use Value: Dual-rail monitoring capability (via shared RESET IN pin with multiplexed dividers) reduces BOM count; guaranteed reset at VCC = 1V ensures RTC retention integrity during deep brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6303ESA+T | Push-pull active-low RESET output (vs. open-drain); same timing, threshold, and package. | Eliminates need for external pullup; higher drive strength supports heavier reset bus loads. | Select when driving multiple devices or long PCB traces where rise time matters; not drop-in due to output structure change. |
| TPS3808G12DBVR | Fixed 1.2V reset threshold; 1.8–6.0V supply; 2.5µA ICC; no adjustable watchdog. | Lacks capacitor-programmable watchdog and reset timeout; simpler for fixed-voltage, low-complexity designs. | Choose for cost-sensitive, single-rail applications where adjustable timing is unnecessary and 1.2V threshold suffices. |
Compared with MAX6303ESA+T, the MAX6301ESA+T offers lower system component count (no pullup needed for wired-OR) but less drive strength; versus TPS3808G12DBVR, it trades fixed simplicity for full configurability in reset voltage, timeout, and watchdog behavior - critical for multi-rail or ultra-low-power designs.
Availability
MAX6301ESA+T is available at Aetrix Electronics and suitable for medical instrumentation, industrial embedded controllers, and battery-powered portable equipment requiring stable component supply across extended product lifecycles.
Supply support for MAX6301ESA+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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing markets.
The MAX6301–MAX6304 family was designed specifically for low-power microprocessor supervision in space-constrained, battery-operated, and noise-prone environments - emphasizing adjustability, transient immunity, and wide supply tolerance.
FAQ
What is the minimum supply voltage at which MAX6301ESA+T guarantees RESET assertion?
MAX6301ESA+T guarantees RESET assertion at VCC ≥ 1V. Below this level, output drive capability degrades, but the device remains functional down to VCC = 2V per absolute maximum ratings. For applications requiring valid reset down to 0V, a 100kΩ pulldown resistor on the RESET pin is recommended per Maxim's application guidance. This behavior is confirmed in the Electrical Characteristics table under "Guaranteed RESET Asserted At or Above VCC = 1V (MAX6301/MAX6303)".
How do I calculate the reset timeout period for MAX6301ESA+T?
The reset timeout period (tRP) for MAX6301ESA+T is calculated as tRP = 2.67 × CSRT, where CSRT is the capacitor value in pF connected between SRT and GND, and tRP is in µs. For example, a 1500pF capacitor yields tRP ≈ 4005 µs (4.0 ms), matching the typical value in the datasheet. Capacitor leakage must be <10nA; X7R or C0G ceramics are recommended. This relationship is validated in the Typical Operating Characteristics graph "RESET TIMEOUT PERIOD vs. CSRT" and the Pin Description section.
Can MAX6301ESA+T monitor a voltage other than VCC?
Yes, MAX6301ESA+T can monitor any DC voltage - including battery voltage, analog sensor rails, or isolated supplies - by connecting that voltage to the RESET IN pin through an external resistor divider. The reset threshold VRST is set using VRST = 1.22 × (R1 + R2)/R2, where R2 connects to GND and the divider midpoint connects to RESET IN. This configuration is explicitly shown in Figure 4 ("Monitoring Voltages Other than VCC") and supported by the pin function description for RESET IN.
What is the purpose of the WDS pin on MAX6301ESA+T?
The WDS (Watchdog Select) pin on MAX6301ESA+T controls watchdog timer scaling: when pulled to GND, it enables normal-mode timeout (ms range); when pulled to VCC, it activates extended mode, multiplying the basic timeout by 500 (up to ~22 minutes with 1µF). A state change on WDS also resets the watchdog counter to zero. This dual-mode capability is documented in the General Description, Pin Description, and Detailed Description sections, and enables flexible power-management strategies like µP wake-up timers.
Is MAX6301ESA+T pin-compatible with other members of the MAX6301–MAX6304 family?
Yes, MAX6301ESA+T shares identical pinout and package (8-pin SO) with MAX6302ESA+T, MAX6303ESA+T, and MAX6304ESA+T. However, output type differs: MAX6301ESA+T has open-drain active-low RESET, while MAX6302ESA+T is open-drain active-high, MAX6303ESA+T is push-pull active-low, and MAX6304ESA+T is push-pull active-high. Thus, direct substitution requires verifying reset polarity and drive architecture in the target circuit.
MAX6301ESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 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+T FAQ
1.How can I place an order for MAX6301ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6301ESA+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 MAX6301ESA+T reliable?
The price and inventory of MAX6301ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6301ESA+T is usually 5 days.
3.What payment methods are accepted for MAX6301ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6301ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6301ESA+T?
MAX6301ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6301ESA+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 MAX6301ESA+T?
For technical support, including MAX6301ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6301ESA+T requirements.
6.How does Aetrix verify that MAX6301ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX6301ESA+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 MAX6301ESA+T meets industry standards.
7.What is the process for return or replacement of MAX6301ESA+T?
All MAX6301ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6301ESA+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 MAX6301ESA+T part is unused and in its original packaging.
Return procedure for MAX6301ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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