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Analog Devices Inc./Maxim Integrated MAX6301CSA+CL0
- Part No.:
- MAX6301CSA+CL0
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6301CSA+CL0.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,928
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Product details
Overview
MAX6301CSA+CL0 from Maxim Integrated is an active-low, open-drain microprocessor supervisory IC designed for precise reset and watchdog monitoring in low-power embedded systems. It features adjustable reset threshold (≥1.22V), adjustable reset timeout (2.8–5.2 ms with 1500pF), 4µA supply current, power-supply transient immunity, and guaranteed RESET assertion down to VCC = 1V. It is used in battery-powered medical instruments and portable controllers requiring reliable brownout detection.
For engineers reviewing the MAX6301CSA+CL0 datasheet, MAX6301CSA+CL0 pinout, MAX6301CSA+CL0 application, or MAX6301CSA+CL0 equivalent, key selection criteria include its open-drain active-low reset output, external capacitor–based timeout tuning, 500× watchdog extension via WDS pin, and operation across 0°C to +70°C in SO-8 package.
Technical Context
The MAX6301CSA+CL0 implements a precision bandgap-based reset comparator with 1.22V internal reference, enabling user-defined reset thresholds via external resistor dividers. Its reset timeout and watchdog timeout are independently set using precision 500nA current sources at SRT and SWT pins, respectively.
Watchdog operation supports two modes: normal mode (WDS = GND, timeout in ms) and extended mode (WDS = VCC, timeout multiplied by 500, up to seconds). The device guarantees valid reset assertion even during fast VCC transients (e.g., ≤50µs for 100mV overdrive), and disables watchdog functionality when WDI is left unconnected in extended mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2V to +5.5V - supports standard 3.3V/5V rails and brownout detection down to 2V |
| Quiescent Supply Current | 4.0 µA typical - enables multi-year battery life in portable equipment |
| Reset Threshold Reference | 1.22 V ±25 mV - sets minimum detectable voltage drop via external R-divider |
| Reset Timeout Period | 2.8–5.2 ms (with CSRT = 1500 pF) - configurable timing ensures µP initialization completes before release |
| Watchdog Timeout (Normal) | 2.8–5.2 ms (with CSWT = 1500 pF) - matches short software loops without false triggers |
| Watchdog Timeout (Extended) | 1.4–2.6 s (with CSWT = 1500 pF, WDS = VCC) - enables long sleep intervals in wake-up timer applications |
| Reset Output Type | Open-drain, active-low - allows wired-OR with other reset sources and flexible pull-up voltage selection |
Pinout & Package
MAX6301CSA+CL0 is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free, with 1.27 mm pitch and standard JEDEC MS-012AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | High-impedance reset comparator input | Connects to center tap of external R-divider to set custom reset threshold 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 node | Sinks 500 nA to ground; CSRT value directly determines tRP = 2.67 × CSRT (pF → µs) |
| 4 - SWT | Watchdog timeout capacitor node | Sinks 500 nA to ground; CSWT value sets base tWD = 2.67 × CSWT (pF → µs) |
| 5 - WDS | Watchdog mode select | Logic-low = normal mode (ms timeout); logic-high = extended mode (500× timeout, up to seconds) |
| 6 - WDI | Watchdog input | Rising/falling edge resets watchdog timer; high-impedance in normal mode; internally driven in extended mode |
| 7 - RESET | Open-drain active-low reset output | Drives µP reset pin low during fault; requires external pull-up; compatible with bidirectional µP reset I/O |
| 8 - VCC | Positive supply input | Must be bypassed with 0.1 µF ceramic capacitor placed adjacent to pin for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Settable above 1.22V using two external resistors - eliminates need for fixed-threshold variants across diverse supply rails |
| 500× watchdog timeout multiplier | Configured via WDS pin - enables single part to serve both real-time monitoring and ultra-low-power wake-up timer functions |
| Power-supply transient immunity | Immune to ≤50 µs negative-going VCC glitches ≥100 mV below VRST - prevents spurious resets in noisy environments |
| Guaranteed reset assertion at VCC ≥ 1V | Ensures µP remains held in reset until sufficient supply voltage is established - critical for reliable power-up sequencing |
| Low-leakage timing inputs (SRT/SWT) | 500 nA precision current sources - enable accurate timeout periods with low-leakage ceramic capacitors, minimizing board-level drift |
Applications
| Medical Patient Monitor | Portable ECG Device |
|---|---|
Use Scenario: Continuous low-power monitoring of analog front-end and MCU during battery operation with intermittent data transmission. IC Role / Device Role / Timing Role: Supervises VCC and triggers system reset on brownout; provides programmable watchdog timeout aligned with firmware execution cycles. Use Value: Prevents corrupted sensor readings or missed alarms by ensuring deterministic MCU restart after supply dip, while 4µA quiescent current extends battery life. |
Use Scenario: Wearable cardiac monitor operating on coin-cell battery with sleep/wake cycles managed by firmware. IC Role / Device Role / Timing Role: Acts as wake-up timer: WDS pulled high to extend watchdog timeout to ~2 seconds, waking MCU periodically for signal sampling. Use Value: Eliminates need for separate RTC or timer IC; leverages same low-power supervisor for both safety-critical reset and energy-efficient scheduling. |
| Industrial Data Logger | Smart Home Sensor Hub |
Use Scenario: Remote environmental logger powered by solar-charged Li-ion, subject to variable input voltage and thermal stress. IC Role / Device Role / Timing Role: Monitors main rail voltage with user-adjusted threshold (e.g., 2.7V) and provides glitch-immune reset during partial shading events. Use Value: Avoids false resets from brief solar panel voltage dips, improving field reliability without sacrificing brownout protection. |
Use Scenario: Battery-backed Zigbee hub managing multiple low-power sensors, requiring robust startup and hang detection. IC Role / Device Role / Timing Role: Provides active-low open-drain reset output compatible with mixed-voltage SoC reset pins and supports manual reset via pushbutton. Use Value: Enables shared reset bus across subsystems; manual reset integration simplifies field recovery without firmware intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6303CSA+T | Push-pull active-low reset output; guaranteed reset down to VCC = 0V with external pulldown | Preferred where µP reset pin requires driven high/low (no external pull-up) or full 0V–VCC validity is mandatory | Select MAX6303CSA+T when driving reset-sensitive logic without pull-up or when VCC may collapse below 1V during shutdown |
| TPS3808G12DBVR | Fixed 1.2V reset threshold; 1.8–6V supply range; 2.5µA ICC; no adjustable watchdog | Suitable for cost-sensitive designs where only basic reset is needed and timeout tuning is unnecessary | Choose TPS3808G12DBVR for simpler, lower-cost supervision where external capacitor tuning and watchdog flexibility are not required |
Compared with MAX6301CSA+CL0, MAX6303CSA+T offers stronger reset drive but loses open-drain flexibility, while TPS3808G12DBVR reduces design complexity at the expense of configurability - making MAX6301CSA+CL0 optimal for applications demanding tunable timing and multi-source reset arbitration.
Availability
MAX6301CSA+CL0 is available at Aetrix Electronics and suitable for medical instrumentation, portable controllers, and battery-powered data loggers requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX6301CSA+CL0 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, medical, and communications applications.
The MAX6301–MAX6304 family was designed specifically for low-power microprocessor supervision in space-constrained, battery-operated systems where adjustable reset and watchdog timing are essential for system reliability and energy efficiency.
FAQ
What is the function of the WDS pin on the MAX6301CSA+CL0?
The WDS (Watchdog Select) pin on the MAX6301CSA+CL0 configures watchdog timer operation: logic-low selects normal mode (timeout in milliseconds), while logic-high enables extended mode (500× multiplication, yielding timeout in seconds). A state change on WDS resets the watchdog counter to zero, and the pin must be actively driven - floating is not permitted. This dual-mode capability makes MAX6301CSA+CL0 uniquely suited for both real-time hang detection and ultra-low-power wake-up timer functions.
Can the MAX6301CSA+CL0 monitor voltages other than VCC?
Yes, the MAX6301CSA+CL0 can monitor any DC voltage by connecting it to the RESET IN pin through an external resistor divider. The internal 1.22V reference sets the trip point, so VRST = 1.22 × (R1 + R2)/R2. For example, to monitor a 3.3V rail at 2.8V threshold, R1/R2 ≈ 1.30. The high-impedance input draws <1 nA, minimizing loading. This flexibility allows MAX6301CSA+CL0 to supervise auxiliary supplies, battery voltage, or sensor references without additional components.
What is the maximum leakage current allowed on the SRT and SWT pins of the MAX6301CSA+CL0?
The SRT and SWT pins of the MAX6301CSA+CL0 each source a precision 500 nA current for timing. To maintain accuracy, total leakage (board + capacitor + probe) at either pin must remain below 10 nA - less than 2% of the timing current. Ceramic capacitors are recommended due to their low leakage (<1 nA). Avoid high-leakage types like electrolytic or certain film caps. Layout best practices include short traces, isolation from noisy signals, and clean prototype boards - critical because 10 nA error introduces >2% timeout deviation in MAX6301CSA+CL0.
Does the MAX6301CSA+CL0 require an external pull-up resistor on the RESET pin?
Yes, the MAX6301CSA+CL0 features an open-drain, active-low RESET output and requires an external pull-up resistor to VCC or another logic-compatible voltage. Typical values range from 4.7kΩ to 100kΩ, balancing rise time and power consumption. This architecture enables wired-OR connection with other reset sources (e.g., manual reset switch, other supervisors) and supports mixed-voltage interfaces - a key advantage over push-pull alternatives. Without the pull-up, RESET remains undefined, and MAX6301CSA+CL0 cannot assert a valid logic-high level.
How does the MAX6301CSA+CL0 achieve immunity to power-supply transients?
The MAX6301CSA+CL0 achieves power-supply transient immunity through internal hysteresis (20 mV) and a proprietary response delay mechanism. When VCC dips negatively, the device ignores transients shorter than a threshold duration - e.g., ≤50 µs for a 100 mV overdrive below VRST - as shown in the "Maximum Transient Duration vs. Reset Threshold Overdrive" graph. This behavior prevents false resets caused by switching noise or coupling spikes, while still guaranteeing response to sustained brownouts. The design ensures MAX6301CSA+CL0 remains stable in electrically harsh environments like motor-driven medical equipment or industrial gateways.
MAX6301CSA+CL0 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:
- 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-SOIC
MAX6301CSA+CL0 FAQ
1.How can I place an order for MAX6301CSA+CL0 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6301CSA+CL0 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 MAX6301CSA+CL0 reliable?
The price and inventory of MAX6301CSA+CL0 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6301CSA+CL0 is usually 5 days.
3.What payment methods are accepted for MAX6301CSA+CL0?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6301CSA+CL0 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6301CSA+CL0?
MAX6301CSA+CL0 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6301CSA+CL0 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 MAX6301CSA+CL0?
For technical support, including MAX6301CSA+CL0 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6301CSA+CL0 requirements.
6.How does Aetrix verify that MAX6301CSA+CL0 is sourced from the original manufacturer or authorized distributors?
All MAX6301CSA+CL0 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 MAX6301CSA+CL0 meets industry standards.
7.What is the process for return or replacement of MAX6301CSA+CL0?
All MAX6301CSA+CL0 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6301CSA+CL0, 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 MAX6301CSA+CL0 part is unused and in its original packaging.
Return procedure for MAX6301CSA+CL0:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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