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Analog Devices Inc./Maxim Integrated MAX6301CUA+T
- Part No.:
- MAX6301CUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX6301CUA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,206
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Product details
Overview
MAX6301CUA+T from Maxim Integrated is an 8-pin µMAX-packaged, low-power microprocessor supervisory circuit with adjustable reset threshold (≥1.22V), adjustable reset timeout (via external capacitor on SRT), and adjustable watchdog timeout (via SWT) with 500× extension mode enabled by WDS pin. It features open-drain active-low RESET output, 4µA supply current, and immunity to power-supply transients - used in battery-powered medical instruments and portable embedded controllers requiring reliable brownout detection.
For engineers reviewing the MAX6301CUA+T datasheet, MAX6301CUA+T pinout, MAX6301CUA+T application, or MAX6301CUA+T equivalent, this page delivers verified electrical parameters, precise pin functions, real-world timing behavior (e.g., tRP = 2.67 × CSRT), thermal stability data (±0.002V over –40°C to +85°C), and validated alternative options for reset supervision in space-constrained, low-quiescent-current designs.
Technical Context
The MAX6301CUA+T implements a precision bandgap-based reset comparator referenced to 1.22V, with external resistor divider programmability for VRST ≥1.22V. Its reset assertion is guaranteed down to VCC = 1V, and reset deassertion includes a fixed timeout period determined solely by capacitor CSRT connected to SRT.
Its watchdog timer operates in two modes: normal (WDS = GND, tWD = 2.67 × CSWT in µs) and extended (WDS = VCC, tWD × 500). The WDI input accepts ≥30ns pulses and clears the timer on any edge; the internal watchdog counter resets on WDI or WDS transitions, and is held cleared during RESET assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2V to +5.5V - supports operation across 3.3V and 5V systems, with valid reset down to VCC = 1V. |
| Quiescent Current | 4.0µA typical - enables multi-year battery life in portable equipment without compromising supervision reliability. |
| Reset Threshold Accuracy | ±25mV at 1.22V reference - ensures predictable brownout detection with <0.002V drift over temperature. |
| Reset Timeout Period | 2.8ms to 5.2ms (CSRT = 1500pF) - configurable via external capacitor; timing current is 500nA, requiring low-leakage ceramic caps. |
| Watchdog Timeout (Normal) | 2.8ms to 5.2ms (CSWT = 1500pF) - matches reset timeout for synchronized fault recovery; scalable linearly with capacitance. |
| Watchdog Timeout (Extended) | 1.4s to 2.6s (CSWT = 1500pF, WDS = VCC) - 500× multiplication enables long sleep intervals in wake-up timer applications. |
| Power-Supply Transient Immunity | Withstands ≤50µs negative-going transients of 100mV below VRST - prevents false resets during switching noise events. |
Pinout & Package
MAX6301CUA+T is housed in an 8-pin µMAX package (U8-1 outline, 3mm × 3mm, 0.5mm pitch), RoHS-compliant and lead-free (indicated by '+' suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | High-impedance reset threshold input | Connects to center tap of R1/R2 divider; sets VRST = 1.22 × (R1 + R2)/R2; leakage ±1nA avoids threshold error. |
| 2 - GND | Analog and digital ground reference | Shared return for internal comparators, timers, and output stage; must be low-impedance for transient immunity. |
| 3 - SRT | Reset timeout capacitor connection | Sinks 500nA precision current; CSRT value directly sets tRP (µs) = 2.67 × CSRT (pF); requires low-leakage ceramic cap. |
| 4 - SWT | Watchdog timeout capacitor connection | Sinks identical 500nA current; CSWT sets basic tWD (µs) = 2.67 × CSWT (pF); same capacitor constraints as SRT. |
| 5 - WDS | Watchdog mode select control | Logic-high (VCC) enables 500× timeout extension; logic-low (GND) selects normal mode; state change resets watchdog timer. |
| 6 - WDI | Watchdog input trigger | Edge-sensitive (≥30ns pulse); clears watchdog on rising/falling edge; in extended mode, unconnected WDI auto-serviced. |
| 7 - RESET | Open-drain, active-low reset output | Pulls low during reset assertion; requires external pullup; sinks ≥3.2mA at VCC ≥4.5V; compatible with bidirectional µP reset pins. |
| 8 - VCC | Positive supply input | Operates from +2V to +5.5V; bypass with 0.1µF ceramic capacitor placed adjacent to pin for noise rejection. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Settable to any voltage ≥1.22V using two external resistors - eliminates need for fixed-threshold variants across diverse supply rails. |
| Capacitor-adjustable reset timeout | tRP = 2.67 × CSRT (pF) in µs - enables precise matching to µP power-on reset requirements without firmware changes. |
| 500× watchdog timeout multiplier | WDS pin toggles between normal (ms-range) and extended (s-range) modes - supports ultra-low-power wake-up timer architectures. |
| Power-supply transient immunity | Immune to ≤50µs glitches 100mV below VRST - maintains system stability in noisy industrial or automotive environments. |
| Guaranteed RESET assertion at VCC ≥1V | Ensures valid reset signal during deep brownout - critical for fail-safe shutdown in battery-backed medical devices. |
Applications
| Medical Vital Signs Monitor | Portable Data Logger |
|---|---|
Use Scenario: Continuous ECG/SpO₂ monitoring powered by coin-cell battery with intermittent sensor sampling. IC Role / Device Role / Timing Role: Supervises main µP (e.g., MSP430) during sleep/wake cycles; WDS toggled to extend watchdog timeout during sleep, then shortened for hang detection during active sampling. Use Value: Enables >5-year battery life while guaranteeing recovery from software lockups - leveraging 4µA ICC and 500× watchdog extension. |
Use Scenario: Remote environmental sensor node logging temperature/humidity every 10 minutes, transmitting via BLE only upon threshold breach. IC Role / Device Role / Timing Role: Provides brownout reset during battery voltage sag; uses adjustable VRST to track declining Li-ion cell voltage (2.8V–3.6V range). Use Value: Prevents corrupted flash writes during undervoltage - using resistor-programmable threshold instead of fixed 2.93V ICs that misfire near end-of-life. |
| Industrial PLC I/O Module | Set-Top Box Power Sequencer |
Use Scenario: DIN-rail mounted controller with isolated 24V input, generating local 3.3V/5V rails for FPGA and communication ICs. IC Role / Device Role / Timing Role: Monitors 5V rail for brownout; asserts open-drain RESET to FPGA and microcontroller simultaneously; immune to 50µs transients from relay switching. Use Value: Eliminates spurious resets caused by field-induced noise - confirmed by transient immunity graph (MAX6301-4 toc06). |
Use Scenario: Consumer STB with multi-rail power (12V, 5V, 3.3V) requiring controlled startup sequence and watchdog supervision of media processor. IC Role / Device Role / Timing Role: Resets media SoC if firmware hangs; uses external capacitor on SRT to set 100ms reset hold time matching SoC specification. Use Value: Ensures deterministic boot after power loss - avoiding "black screen" failures via precise, capacitor-tuned reset duration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6303CUA+T | Push-pull active-low RESET output (vs. open-drain on MAX6301CUA+T); same pinout, timing, and threshold adjustability. | Eliminates need for external pullup resistor; better suited for driving multiple loads or high-capacitance PCB traces. | Select when board layout lacks space for pullup or when driving >100pF net capacitance. |
| TPS3808G125DBVR | Fixed 1.25V reset threshold; 1.8µA ICC; no adjustable watchdog; SOT-23-6 package (6-pin, not pin-compatible). | Lower quiescent current but no timeout or watchdog configurability; requires redesign for capacitor-based timing. | Select only for cost-sensitive, fixed-threshold applications where watchdog is unnecessary and layout allows SOT-23 rework. |
Compared with MAX6303CUA+T, MAX6301CUA+T offers open-drain flexibility for shared reset buses and bidirectional µP interfaces, while TPS3808G125DBVR trades adjustability for lower ICC and smaller footprint - making MAX6301CUA+T optimal when design requires field-programmable thresholds and watchdog scalability without layout changes.
Availability
MAX6301CUA+T is available at Aetrix Electronics and suitable for medical instrumentation, portable data loggers, industrial PLC modules, and set-top box power sequencing requiring stable component supply across extended product lifecycles.
Supply support for MAX6301CUA+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 and mixed-signal ICs for demanding industrial, medical, and communications applications, emphasizing low power, high reliability, and integration.
The MAX6301–MAX6304 family was engineered specifically for ultra-low-power microprocessor supervision in battery-operated and space-constrained systems, prioritizing adjustable timing, transient resilience, and flexible reset output configurations.
FAQ
What is the minimum supply voltage at which MAX6301CUA+T guarantees RESET assertion?
MAX6301CUA+T guarantees RESET assertion down to VCC = 1V. This is explicitly specified in the Electrical Characteristics table under "Guaranteed RESET Asserted At or Above VCC = 1V (MAX6301/MAX6303)". Below 1V, RESET output drive capability degrades, but the device remains functional and will assert RESET as VCC falls through the programmed VRST threshold - critical for fail-safe shutdown in battery-powered medical devices using MAX6301CUA+T.
How do I calculate the reset timeout period for MAX6301CUA+T?
The reset timeout period tRP for MAX6301CUA+T is calculated as tRP (µs) = 2.67 × CSRT (pF), where CSRT is the capacitor connected between SRT (pin 3) and GND. For example, a 1500pF capacitor yields tRP ≈ 4005µs (4.0ms), matching the datasheet's typical value. This linear relationship holds because SRT sources a precision 500nA current - so accurate timing requires low-leakage ceramic capacitors, as stated in Note 3 of the Electrical Characteristics section for MAX6301CUA+T.
Can MAX6301CUA+T monitor voltages other than VCC?
Yes, MAX6301CUA+T can monitor any DC voltage by connecting it to the RESET IN pin (pin 1) through an external resistor divider. The monitored voltage (VIN) is scaled to match the internal 1.22V reference: VRST = 1.22 × (R1 + R2)/R2. Figure 4 in the datasheet shows this configuration applied to non-VCC rails. Since RESET IN has ±1nA leakage, high-value resistors (e.g., 1MΩ/1MΩ) minimize current draw while maintaining accuracy - a key capability leveraged in multi-rail systems using MAX6301CUA+T.
What is the function of the WDS pin on MAX6301CUA+T?
The WDS (Watchdog-Select) pin on MAX6301CUA+T controls watchdog timer mode: logic-low (GND) selects normal mode with µs-range timeout (tWD = 2.67 × CSWT), while logic-high (VCC) enables extended mode multiplying timeout by 500× (e.g., 1500pF → ~2s). Critically, changing WDS state resets the watchdog counter to zero - enabling dynamic mode switching, such as extending timeout during µP sleep and shortening it during active execution. This dual-mode operation is central to power-saving wake-up timer designs using MAX6301CUA+T.
Does MAX6301CUA+T require an external pullup resistor on the RESET pin?
Yes, MAX6301CUA+T requires an external pullup resistor on the RESET pin (pin 7) because it features an open-drain, active-low output. The datasheet specifies that RESET sinks ≥3.2mA when asserted (VCC ≥4.5V), so the pullup value must balance rise time and current draw - typically 10kΩ to 100kΩ. This architecture allows wired-OR connection with other reset sources and compatibility with bidirectional µP reset pins (e.g., Motorola 68HC11), as shown in Figure 7 of the MAX6301CUA+T datasheet.
MAX6301CUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX6301CUA+T FAQ
1.How can I place an order for MAX6301CUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6301CUA+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 MAX6301CUA+T reliable?
The price and inventory of MAX6301CUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6301CUA+T is usually 5 days.
3.What payment methods are accepted for MAX6301CUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6301CUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6301CUA+T?
MAX6301CUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6301CUA+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 MAX6301CUA+T?
For technical support, including MAX6301CUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6301CUA+T requirements.
6.How does Aetrix verify that MAX6301CUA+T is sourced from the original manufacturer or authorized distributors?
All MAX6301CUA+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 MAX6301CUA+T meets industry standards.
7.What is the process for return or replacement of MAX6301CUA+T?
All MAX6301CUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6301CUA+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 MAX6301CUA+T part is unused and in its original packaging.
Return procedure for MAX6301CUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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