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Analog Devices Inc./Maxim Integrated MAX6302CSA
- Part No.:
- MAX6302CSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6302CSA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,409
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Product details
Overview
MAX6302CSA from Maxim Integrated is an active-high, open-drain microprocessor supervisory circuit designed for reliable 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), 500× watchdog timeout multiplier, 4µA supply current, and guaranteed RESET assertion above VCC = 1.31V - used in battery-powered medical instruments and portable controllers requiring brownout immunity.
For engineers reviewing the MAX6302CSA datasheet, MAX6302CSA pinout, MAX6302CSA application, or MAX6302CSA equivalent, this page delivers verified electrical behavior, SO-8 package layout guidance, real-world timing dependencies on CSRT/CSWT capacitors, and substitution options validated for active-high open-drain reset output and extended-mode watchdog operation.
Technical Context
The MAX6302CSA implements a precision bandgap reference (1.22V) to set reset thresholds via external resistor dividers, with ±20mV hysteresis and <1nA input leakage. Its reset timer uses a 500nA current source into CSRT to generate 2.8–5.2ms timeout at 1500pF, while the watchdog timer employs identical current sourcing into CSWT - scaled by WDS logic to deliver either millisecond-scale (WDS = GND) or second-scale (WDS = VCC) timeouts.
It operates across VCC = 1.31V to 5.5V, supports manual reset via parallel switch on RESET IN, and provides power-supply transient immunity up to 50µs at 100mV overdrive. The open-drain RESET output drives high only when VCC exceeds VRST and the reset timeout expires - enabling wired-OR reset bus configurations with other supervisors or µP I/O.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.31V to 5.5V - ensures valid operation during deep brownout down to 1.31V, critical for Li-ion battery discharge profiles. |
| Quiescent Current | 4.0µA typical - enables multi-year operation in coin-cell-powered portable equipment without compromising supervision integrity. |
| Reset Threshold Accuracy | 1.220V ±25mV at +25°C - sets precise voltage trip point for system-level brownout detection using external R-divider. |
| Reset Timeout Period | 4.0ms typical with 1500pF on SRT - defines minimum reset pulse width required to reliably initialize µP state machines. |
| Watchdog Timeout (Extended) | 2.0s typical with 1500pF on SWT and WDS = VCC - provides long-duration wake-up intervals for ultra-low-power sleep/wake cycles. |
| RESET Output Type | Active-high, open-drain - allows direct connection to µP reset pins requiring pull-up, or wired-OR with other reset sources. |
| Power-Supply Transient Immunity | Withstands ≤50µs negative transients of 100mV below VRST - prevents spurious resets during switching noise or load-dump events. |
Pinout & Package
MAX6302CSA is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, with 1.27mm pitch and gull-wing leads. Thermal resistance θJA = 170°C/W; recommended PCB pad layout per Maxim land pattern 90-0096.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | High-impedance reset comparator input | Accepts external resistor divider to set custom reset threshold; 1.22V internal reference defines VRST = 1.22 × (R1+R2)/R2. |
| 2 - GND | Analog and digital ground reference | Common return for all internal current sources (SRT/SWT) and comparator; must be low-impedance to avoid timing errors. |
| 3 - SRT | Reset timeout capacitor node | 500nA precision current source charges CSRT; tRP = 2.67 × CSRT (pF) → µs; requires low-leakage ceramic capacitor. |
| 4 - SWT | Watchdog timeout capacitor node | Identical 500nA current source charges CSWT; tWD = 2.67 × CSWT (pF) → µs; leakage <10nA essential for accuracy. |
| 5 - WDS | Watchdog mode select control | Logic high (VCC) enables 500× timeout multiplier; logic low (GND) selects base timeout; transition clears watchdog timer. |
| 6 - WDI | Watchdog input trigger | Rising/falling edge resets watchdog counter; in extended mode, unconnected WDI is internally pulsed to disable watchdog. |
| 7 - RESET | Active-high open-drain reset output | Pulled high externally (e.g., 10kΩ to VCC); asserts high during reset condition; compatible with bidirectional µP reset pins. |
| 8 - VCC | Positive supply input | Must be bypassed with 0.1µF ceramic capacitor placed adjacent to pin; supplies internal bandgap, timers, and comparators. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Settable from 1.22V upward using two external resistors - eliminates need for fixed-threshold parts across diverse supply rails. |
| 500× watchdog timeout multiplier | Extends basic timeout from milliseconds to seconds via WDS pin - enables low-duty-cycle wake-up timers without software intervention. |
| Open-drain active-high RESET | Allows shared reset bus with pull-up; avoids contention with µP's internal reset drivers or other supervisors. |
| Guaranteed operation down to VCC = 1.31V | Valid reset assertion and timing functionality maintained even as battery voltage drops below 1.4V - extends usable runtime. |
| Power-supply transient immunity | Rejects glitches ≤50µs wide and ≤100mV deep - prevents false resets in noisy automotive or industrial environments. |
Applications
| Medical Portable Monitors | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Continuous ECG/SpO₂ monitoring powered by single Li-ion cell with voltage decay from 4.2V to 2.8V. IC Role / Device Role / Timing Role: MAX6302CSA monitors battery voltage via RESET IN divider, asserts RESET high if VBAT falls below 2.9V, and triggers periodic wake-up via extended watchdog to sample sensors. Use Value: Prevents corrupted measurements during brownout; enables 30-day logging on 500mAh cell by minimizing µP active time. |
Use Scenario: Remote environmental sensor node sleeping >99% of time, waking every 10 minutes to record temperature/humidity. IC Role / Device Role / Timing Role: MAX6302CSA acts as hardware wake-up timer: WDS driven high before sleep, extended watchdog timeout set to 10 minutes via 1.2nF CSWT. Use Value: Eliminates need for µP RTC or external timer IC; reduces BOM cost and PCB area while guaranteeing deterministic wake-up. |
| Industrial PLC I/O Modules | Set-Top Box Power Sequencing |
Use Scenario: DIN-rail mounted controller with isolated 5V and 3.3V rails, subject to 48V field wiring transients. IC Role / Device Role / Timing Role: MAX6302CSA supervises 5V rail, with RESET IN tied to regulated output; RESET output drives µP and FPGA configuration logic. Use Value: Immunity to 50µs/100mV transients prevents lockup during relay switching; open-drain output safely interfaces with multiple downstream devices. |
Use Scenario: Consumer STB requiring controlled power-up sequence: main SoC resets before HDMI PHY and audio codec. IC Role / Device Role / Timing Role: MAX6302CSA generates programmable reset pulse (via 2200pF CSRT) to hold SoC in reset until 5V rail stabilizes and clocks lock. Use Value: Adjustable timeout replaces fixed-delay RC networks; eliminates boot failures due to marginal power supply ramp rates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6304CSA | Push-pull active-high RESET output (vs. open-drain); same pinout, timing, and threshold specs. | Requires no external pull-up; unsuitable for wired-OR reset buses or bidirectional µP reset pins. | Select MAX6304CSA only when driving a dedicated µP reset input without shared reset lines. |
| TPS3808G125DBVR | Fixed 1.25V reset threshold; 200ms min timeout; push-pull active-low output; 1.4µA ICC. | Lacks adjustable threshold/watchdog; suited for simple power-on reset only - not for brownout recovery or wake-up timer use. | Choose TPS3808G125DBVR for cost-sensitive designs where voltage margin is stable and extended watchdog is unnecessary. |
Compared with MAX6302CSA, MAX6304CSA offers higher drive strength but forfeits reset bus flexibility, while TPS3808G125DBVR trades adjustability for lower quiescent current and simpler implementation - making each optimal for distinct supervision architecture requirements.
Availability
MAX6302CSA is available at Aetrix Electronics and suitable for medical portable monitors, battery-powered data loggers, industrial PLC I/O modules, and set-top box power sequencing requiring stable component supply across extended product lifecycles.
Supply support for MAX6302CSA 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 power, sensing, and interface applications - emphasizing reliability, low power, and integration for demanding industrial and medical systems.
The MAX6301–MAX6304 family was engineered specifically for flexible, low-quiescent-current microprocessor supervision in space-constrained, battery-operated, or brownout-prone environments - prioritizing configurability over fixed-function simplicity.
FAQ
What is the minimum VCC required for MAX6302CSA to assert RESET reliably?
The MAX6302CSA guarantees valid RESET assertion for VCC ≥ 1.31V. Below this voltage, timing accuracy and output drive capability degrade. This threshold ensures reliable operation during Li-ion battery discharge down to ~2.8V system rail, provided the external reset threshold (VRST) is set above 1.31V using the R1/R2 divider network feeding RESET IN.
How do I configure MAX6302CSA for a 3.3V system reset at 2.85V?
To set MAX6302CSA reset threshold to 2.85V, use the formula VRST = 1.22 × (R1 + R2)/R2. Select R2 = 1MΩ, then solve for R1: R1 = R2 × (VRST/1.22 − 1) = 1MΩ × (2.85/1.22 − 1) ≈ 1.34MΩ. Use standard 1% resistors: R2 = 1.00MΩ, R1 = 1.33MΩ. Connect R1 between VCC and RESET IN, R2 between RESET IN and GND.
Can MAX6302CSA be used as a wake-up timer, and how is the interval set?
Yes - MAX6302CSA functions as a hardware wake-up timer via its extended-mode watchdog. Drive WDS high before µP sleep, then select CSWT to set timeout: e.g., 1.2nF yields ~10 minutes (tWD = 2.67 × 1200pF = 3204µs base; ×500 = 1.6s). For longer intervals, increase CSWT linearly - 10nF gives ~13.3 minutes. Ensure WDI is left unconnected or three-stated in extended mode.
What capacitor type and tolerance are required for SRT and SWT pins?
SRT and SWT require low-leakage ceramic capacitors with leakage <10nA - X7R or C0G dielectrics are preferred. Typical values range 100pF–10nF. Tolerance should be ±10% or better; 5% is recommended for timing-critical applications. Avoid electrolytic, tantalum, or high-leakage film types, as they introduce timing errors due to parasitic DC current paths.
Does MAX6302CSA support manual reset, and how is it implemented?
Yes - manual reset is implemented by adding a normally open momentary switch in parallel with R2 (the lower leg of the RESET IN voltage divider). When pressed, the switch pulls RESET IN to GND, forcing VRST = 0V and triggering reset. The internal timer holds RESET high for the full tRP period (e.g., 4ms with 1500pF), providing inherent debounce without external components.
MAX6302CSA 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 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 FAQ
1.How can I place an order for MAX6302CSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6302CSA 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 reliable?
The price and inventory of MAX6302CSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6302CSA is usually 5 days.
3.What payment methods are accepted for MAX6302CSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6302CSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6302CSA?
MAX6302CSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6302CSA 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?
For technical support, including MAX6302CSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6302CSA requirements.
6.How does Aetrix verify that MAX6302CSA is sourced from the original manufacturer or authorized distributors?
All MAX6302CSA 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 meets industry standards.
7.What is the process for return or replacement of MAX6302CSA?
All MAX6302CSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6302CSA, 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 part is unused and in its original packaging.
Return procedure for MAX6302CSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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