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Analog Devices Inc./Maxim Integrated MAX6302CSA+T
- Part No.:
- MAX6302CSA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6302CSA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,529
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Product details
Overview
MAX6302CSA+T from Maxim Integrated is an active-high, open-drain microprocessor supervisory circuit with adjustable reset threshold (≥1.22V), adjustable reset timeout (via external capacitor on SRT pin), and dual-mode watchdog timer (normal mode: ms-range; extended mode: up to 22 minutes via WDS pin). It operates from 1.31V to 5.5V and draws only 4µA, making it suitable for battery-powered medical instruments and portable embedded controllers requiring precise brownout detection and fail-safe software monitoring.
For engineers reviewing the MAX6302CSA+T datasheet, MAX6302CSA+T pinout, MAX6302CSA+T application, or MAX6302CSA+T equivalent, key selection criteria include its active-high open-drain RESET output, 500× watchdog timeout multiplier, guaranteed operation down to VCC = 1.31V, power-supply transient immunity, and compatibility with µP reset I/O pins requiring high-impedance assertion control.
Technical Context
The MAX6302CSA+T implements a precision bandgap-based reset comparator referenced to 1.22V, with external resistor divider programmability for VRST ≥ 1.22V. Its reset timeout is generated by a 500nA current source charging CSRT, yielding tRP = 2.67 × CSRT (CSRT in pF, tRP in µs).
The watchdog uses the same 500nA current source on SWT, with timeout scaling determined by WDS logic level: GND selects normal mode (tWD = 2.67 × CSWT); VCC enables extended mode (tWD × 500). WDI accepts >30ns transitions to clear the timer, and internal drive in extended mode allows watchdog disable via floating WDI.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.31V to 5.5V - supports low-voltage µPs and wide-input industrial rails without external regulation |
| Quiescent Current | 4µA typical - enables multi-year battery life in portable equipment with periodic wake-up cycles |
| Reset Threshold | Adjustable ≥1.22V via R1/R2 divider - sets precise brownout point independent of VCC nominal value |
| Reset Timeout Range | 2.8ms to 5.2ms (with 1500pF on SRT) - configurable timing ensures µP initialization completes before release |
| Watchdog Timeout | 2.8ms–5.2ms (normal) or 1.4s–2.6s (extended, WDS=VCC) - selectable granularity for firmware loop supervision |
| RESET Output Type | Active-high, open-drain - compatible with bidirectional µP reset pins and flexible pull-up voltage selection |
| Power-Supply Transient Immunity | Withstands ≤50µs, 100mV negative-going VCC glitches - prevents spurious resets in noisy environments |
Pinout & Package
MAX6302CSA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free, with 1.27mm 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 R1/R2 divider to set VRST = 1.22 × (R1 + R2)/R2; leakage < ±1nA avoids threshold error |
| 2 GND | Analog and digital ground reference | Common return for all internal current sources (SRT/SWT) and comparator; must be low-impedance |
| 3 SRT | Reset timeout capacitor connection | Sinks 500nA to ground; CSRT value directly sets tRP = 2.67 × CSRT (pF → µs); requires low-leakage ceramic cap |
| 4 SWT | Watchdog timeout capacitor connection | Sinks 500nA to ground; CSWT value sets base tWD; leakage < 10nA critical for timing accuracy |
| 5 WDS | Watchdog mode select input | Logic-low = normal mode (ms timeout); logic-high = extended mode (×500 timeout); edge-triggered reset of watchdog counter |
| 6 WDI | Watchdog input trigger | Rising/falling edge clears timer; in extended mode, internally driven if floating - enables watchdog disable without µP I/O |
| 7 RESET | Active-high, open-drain reset output | Pulled high externally; asserts high during fault; compatible with µP bidirectional reset pins and mixed-voltage systems |
| 8 VCC | Positive supply input | Must be bypassed with 0.1µF ceramic cap near pin; valid operation guaranteed from 1.31V, enabling ultra-low-power designs |
Key Features
| Feature | Design Value |
|---|---|
| 500× watchdog timeout multiplier | Enables single capacitor to cover both short-loop supervision (ms) and long sleep intervals (minutes), reducing BOM count |
| Adjustable reset threshold ≥1.22V | Supports custom brownout points for non-5V systems (e.g., 3.3V, 2.5V, 1.8V rails) without trimming or calibration |
| Open-drain active-high RESET | Allows shared reset bus with multiple devices and flexible pull-up to any logic rail (3.3V, 5V, or VCC) |
| 4µA supply current | Minimizes battery drain in always-on monitoring applications such as portable ECG monitors or sensor nodes |
| Power-supply transient immunity | Rejects common noise spikes (≤50µs, 100mV) on VCC, eliminating need for additional filtering in cost-sensitive designs |
| Watchdog disable via floating WDI | Eliminates µP I/O pin requirement for watchdog control in extended mode - simplifies firmware and reduces pin count |
Applications
| Medical Vital Sign Monitors | Portable Data Loggers |
|---|---|
Use Scenario: Continuous ECG/SpO₂ acquisition in battery-powered handheld units with sleep/wake cycles. IC Role / Device Role / Timing Role: Supervises µP power integrity during wake-up; triggers reset if VCC drops below 2.7V during analog front-end activation. Use Value: Prevents corrupted waveform storage by ensuring µP executes boot sequence only when supply meets ADC reference stability requirements. |
Use Scenario: Remote environmental sensors logging temperature/humidity every 10 minutes using deep-sleep µP. IC Role / Device Role / Timing Role: Acts as wake-up timer: WDS pulled high to extend watchdog timeout to 22 minutes, then asserts RESET to awaken µP. Use Value: Replaces dedicated RTC or external timer IC, reducing component count and PCB area while maintaining ±5% timing accuracy. |
| Industrial PLC I/O Modules | Battery-Powered Set-Top Boxes |
Use Scenario: DIN-rail mounted controller modules exposed to 24V DC supply fluctuations and EMI. IC Role / Device Role / Timing Role: Monitors local 3.3V LDO output; asserts RESET on brownout or software hang detected via WDI polling. Use Value: Guarantees deterministic recovery from power transients without µP lockup, meeting IEC 61000-4-4 surge immunity requirements. |
Use Scenario: Cable TV receivers with backup battery for channel memory and clock retention during AC loss. IC Role / Device Role / Timing Role: Supervises 3.3V backup rail; provides reset pulse if voltage sags below 2.9V during battery switchover. Use Value: Eliminates EEPROM corruption risk by holding µP in reset until backup supply stabilizes, preserving user settings across outages. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6304CSA+T | Push-pull active-high RESET output (vs. MAX6302CSA+T's open-drain); identical timing, threshold, and watchdog architecture | Requires no external pull-up; better for driving heavy capacitive loads or level-shifting circuits | Select MAX6304CSA+T when board layout lacks space for pull-up resistor or when driving long traces with >50pF capacitance |
| TPS3808G125DBVR | Fixed 1.25V reset threshold; 3.8µA ICC; no adjustable watchdog; push-pull active-low RESET | Lacks programmable timeout and watchdog extension; suited for simple power-on reset only | Choose TPS3808G125DBVR only if design requires minimal BOM, no watchdog function, and fixed threshold suffices |
Compared with MAX6302CSA+T, MAX6304CSA+T eliminates external pull-up needs but sacrifices bidirectional reset pin compatibility; TPS3808G125DBVR reduces cost and complexity but forfeits adjustability and extended watchdog capability essential for sleep/wake architectures.
Availability
MAX6302CSA+T is available at Aetrix Electronics and suitable for medical instrumentation, portable data loggers, and industrial PLC modules requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MAX6302CSA+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.
The MAX6301–MAX6304 family was engineered specifically for low-power, field-deployable embedded systems needing customizable reset behavior and robust software supervision without external timing components.
FAQ
What is the minimum VCC required for MAX6302CSA+T to guarantee RESET assertion?
MAX6302CSA+T guarantees RESET assertion down to VCC = 1.31V. Below this voltage, the internal reference and comparator may not operate reliably. The device remains functional across its full 1.31V–5.5V range, and RESET deassertion is guaranteed once VCC exceeds the programmed reset threshold plus hysteresis. This makes MAX6302CSA+T suitable for systems powered by single-cell Li-ion or alkaline batteries under load.
How does the WDS pin affect watchdog behavior in MAX6302CSA+T?
In MAX6302CSA+T, the WDS pin selects watchdog mode: grounding WDS enables normal mode (tWD = 2.67 × CSWT in µs); connecting WDS to VCC enables extended mode (tWD × 500). A transition on WDS also clears and restarts the watchdog timer. In extended mode, leaving WDI unconnected disables the watchdog function entirely, as the internal driver pulses WDI before timeout - a feature unique to MAX6302CSA+T among its family.
Can MAX6302CSA+T monitor voltages other than VCC?
Yes, MAX6302CSA+T can monitor any DC voltage via the RESET IN pin. Connect the target voltage (e.g., 3.3V rail, battery voltage, sensor supply) to the center of an R1/R2 divider referenced to ground, setting VRST = 1.22 × (R1 + R2)/R2. The input impedance exceeds 100MΩ, so high-value resistors (e.g., 1MΩ/1MΩ) minimize loading. This enables independent supervision of analog supplies, I/O rails, or battery health thresholds.
What capacitor type is recommended for SRT and SWT on MAX6302CSA+T?
Ceramic capacitors with leakage < 10nA are recommended for both SRT and SWT pins on MAX6302CSA+T. These pins sink a precision 500nA current, and excessive leakage (e.g., from electrolytic or high-K dielectric caps) causes timing errors in reset and watchdog periods. X7R or C0G ceramics in 0603 or 0805 packages provide optimal stability, low parasitic inductance, and negligible leakage across temperature.
Is MAX6302CSA+T pin-compatible with other members of the MAX6301–MAX6304 family?
Yes, MAX6302CSA+T shares identical 8-pin SO package pinout and electrical interface with MAX6301CSA+T, MAX6303CSA+T, and MAX6304CSA+T. All four variants use the same footprint, thermal profile, and PCB layout. Functional differences (e.g., RESET polarity, output type) are implemented internally - allowing drop-in replacement during prototyping or revision changes, provided firmware and external pull-up configuration match the selected variant's output behavior.
MAX6302CSA+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 High
- Reset Timeout:
- 2.8ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX6302CSA+T FAQ
1.How can I place an order for MAX6302CSA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6302CSA+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 MAX6302CSA+T reliable?
The price and inventory of MAX6302CSA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6302CSA+T is usually 5 days.
3.What payment methods are accepted for MAX6302CSA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6302CSA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6302CSA+T?
MAX6302CSA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6302CSA+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 MAX6302CSA+T?
For technical support, including MAX6302CSA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6302CSA+T requirements.
6.How does Aetrix verify that MAX6302CSA+T is sourced from the original manufacturer or authorized distributors?
All MAX6302CSA+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 MAX6302CSA+T meets industry standards.
7.What is the process for return or replacement of MAX6302CSA+T?
All MAX6302CSA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6302CSA+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 MAX6302CSA+T part is unused and in its original packaging.
Return procedure for MAX6302CSA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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