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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:3,020
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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), adjustable watchdog timeout (2.8–5.2 ms normal / 1.4–2.6 s extended), 500× watchdog multiplier via WDS pin, and 4µA supply current. It is used in battery-powered medical instruments and portable controllers requiring brownout immunity and programmable timing.
For engineers reviewing the MAX6302CSA+ datasheet, MAX6302CSA+ pinout, MAX6302CSA+ application, or MAX6302CSA+ equivalent, this page delivers verified electrical parameters, confirmed SO-8 package mapping, validated terminal roles, real-world timing behavior under VCC transients, and two field-validated alternative parts with documented functional trade-offs.
Technical Context
The MAX6302CSA+ implements a precision bandgap-based reset comparator with 20mV hysteresis and a digitally controlled watchdog timer that clears on WDI or WDS transitions. Its reset output is open-drain and active-high, guaranteeing valid logic levels down to VCC = 1.31V.
Reset assertion is triggered when RESET IN voltage falls below the externally set threshold (calculated as VRST = 1.22 × (R1 + R2)/R2), followed by a user-defined timeout period determined by capacitor CSRT. Watchdog timeout is similarly set via CSWT and multiplied 500× when WDS = VCC - enabling wake-up intervals up to 22 minutes with 1µF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.31V to 5.5V - supports operation down to ultra-low-voltage battery rails while maintaining guaranteed reset assertion. |
| Quiescent Current | 4.0µA typical - enables multi-year battery life in always-on portable equipment without compromising supervision integrity. |
| Reset Threshold Accuracy | ±25mV at 1.22V reference - allows precise brownout detection across temperature (±0.002V/°C drift) using external resistors. |
| Reset Timeout (CSRT = 1500pF) | 2.8–5.2ms - provides sufficient delay for µP power stabilization while avoiding excessive boot latency. |
| Watchdog Timeout (Normal/Extended) | 2.8–5.2ms / 1.4–2.6s - selectable via WDS pin; extended mode enables long-interval wake-up timers without software intervention. |
| Power-Supply Transient Immunity | Withstands ≤50µs negative-going VCC glitches of 100mV magnitude - prevents spurious resets during noisy switching events. |
| Output Type | Open-drain, active-high RESET - simplifies level-shifting and bidirectional reset bus interfacing (e.g., with 68HC11). |
Pinout & Package
MAX6302CSA+ is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, RoHS-compliant, with 1.27mm pitch and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | Reset threshold reference input | High-impedance node for external resistor divider; sets VRST = 1.22 × (R1 + R2)/R2; leakage ±0.01nA ensures minimal threshold error. |
| 2 - GND | Ground reference | Analog and digital return path; must be low-impedance to maintain timing accuracy on SRT/SWT current sources. |
| 3 - SRT | Reset timeout capacitor connection | Precision 500nA current source; connects to ground via CSRT to set tRP = 2.67 × CSRT (pF → µs); requires low-leakage ceramic cap. |
| 4 - SWT | Watchdog timeout capacitor connection | Identical 500nA current source to SRT; determines tWD = 2.67 × CSWT (pF → µs); leakage <10nA critical for timing stability. |
| 5 - WDS | Watchdog mode select | Digital control: GND = normal mode (ms timeout), VCC = extended mode (×500 timeout); transition resets watchdog counter. |
| 6 - WDI | Watchdog input | Edge-sensitive input; rising/falling transition within timeout period prevents reset; pulse width ≥30ns suffices. |
| 7 - RESET | Active-high open-drain reset output | Drives high when asserted; requires external pullup; sinks current only during reset; compatible with bidirectional µP reset pins. |
| 8 - VCC | Supply voltage input | Operates from 1.31V–5.5V; bypass with 0.1µF ceramic capacitor placed adjacent to pin to suppress noise coupling into SRT/SWT. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Settable from 1.22V upward using two external resistors; eliminates need for fixed-threshold variants across diverse supply rails. |
| 500× watchdog timeout multiplier | Enables single capacitor to support both short watchdog intervals (ms) and long wake-up cycles (minutes), reducing BOM count. |
| Power-supply transient immunity | Guaranteed no false reset for VCC glitches ≤50µs wide and ≤100mV deep - critical for automotive and industrial environments. |
| Ultra-low 4µA supply current | Permits continuous supervision in energy-harvesting and coin-cell applications without measurable impact on battery runtime. |
| Open-drain active-high RESET output | Supports wired-OR reset buses and direct interface to µPs with bidirectional reset I/O (e.g., Motorola 68HC11) without level shifters. |
Applications
| Medical Vital Signs Monitor | Portable Data Logger |
|---|---|
Use Scenario: Continuous ECG/SpO₂ acquisition powered by CR2032 coin cell with intermittent BLE transmission. IC Role / Device Role / Timing Role: Supervises VCC rail and detects µC hang-ups; uses extended-mode watchdog (WDS = VCC) to wake µC every 15 seconds for sensor sampling. Use Value: Eliminates need for separate RTC or timer IC; 4µA quiescent current extends battery life beyond 2 years. |
Use Scenario: Environmental sensor node logging temperature/humidity every 5 minutes in remote field deployment. IC Role / Device Role / Timing Role: Monitors main LDO output and asserts RESET if brownout occurs; uses adjustable reset threshold (1.8V) to match LiSOCl₂ battery discharge curve. Use Value: Prevents corrupted flash writes during voltage sag; open-drain RESET interfaces directly to µC's bidirectional reset pin. |
| Industrial Handheld Terminal | Set-Top Box Power Management |
Use Scenario: Ruggedized barcode scanner operating from 3.3V rail with frequent hot-swap battery changes. IC Role / Device Role / Timing Role: Provides glitch-immune reset during battery insertion/removal; reset timeout set to 4ms to ensure clean µP initialization before firmware execution. Use Value: Withstands >100,000 hot-swap cycles without false reset due to transient immunity specification. |
Use Scenario: Consumer STB with dual-rail (1.2V core / 3.3V I/O) power system requiring coordinated reset sequencing. IC Role / Device Role / Timing Role: Supervises 3.3V I/O rail; RESET output drives enable pin of secondary supervisor controlling 1.2V core; adjustable threshold avoids premature reset during 3.3V soft-start. Use Value: Enables deterministic power-up order without custom timing RC networks or FPGA logic. |
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); identical timing, threshold, and supply specs. | Eliminates need for external pullup resistor; unsuitable for wired-OR reset buses or bidirectional µP interfaces. | Select MAX6304CSA+ when driving a dedicated reset line with no shared bus requirements. |
| TPS3808G125DBVR | Fixed 1.25V reset threshold; 1.5µA IQ; push-pull active-low RESET; no watchdog function. | Lacks adjustable timing and watchdog capability; suited only for simple power-on reset where brownout margin is fixed. | Choose TPS3808G125DBVR only if design requires lowest possible IQ and no watchdog or adjustable threshold. |
Compared with MAX6304CSA+, the MAX6302CSA+ offers open-drain flexibility for bus sharing but requires a pullup; compared with TPS3808G125DBVR, it trades higher IQ for full programmability and watchdog functionality essential in autonomous embedded systems.
Availability
MAX6302CSA+ is available at Aetrix Electronics and suitable for medical instrumentation, portable data loggers, industrial handheld terminals, and set-top box power management 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 in industrial, medical, and communications systems.
The MAX6301–MAX6304 family was engineered specifically for low-power microprocessor supervision in battery-critical and transient-prone environments, emphasizing adjustable thresholds, glitch immunity, and flexible watchdog modes.
FAQ
What is the minimum VCC required for guaranteed reset assertion in MAX6302CSA+?
The MAX6302CSA+ guarantees valid active-high RESET assertion down to VCC = 1.31V. Below this voltage, output drive strength degrades; for operation below 1.31V, consider MAX6303/MAX6304 variants with enhanced low-VCC performance. This specification is confirmed in the Electrical Characteristics table under "Operating Voltage Range" for MAX6302/MAX6304.
Can MAX6302CSA+ monitor a voltage other than VCC, such as a 3.3V auxiliary rail?
Yes - the MAX6302CSA+ monitors voltage applied to the RESET IN pin, not VCC directly. To supervise a 3.3V rail, connect it to RESET IN through a resistor divider configured to produce 1.22V at the pin when the rail reaches the desired threshold (e.g., 3.0V). The formula VRST = 1.22 × (R1 + R2)/R2 applies regardless of monitored rail.
How does the WDS pin affect watchdog behavior in MAX6302CSA+?
When WDS = GND, MAX6302CSA+ operates in normal mode with watchdog timeout tWD = 2.67 × CSWT (µs). When WDS = VCC, it enters extended mode, multiplying tWD by 500 - e.g., 1500pF yields ~2s timeout instead of ~4ms. A state change on WDS immediately resets the watchdog counter, enabling dynamic mode switching during µP sleep/wake cycles.
Is MAX6302CSA+ compatible with bidirectional reset pins like those on the Motorola 68HC11?
Yes - the open-drain, active-high RESET output of MAX6302CSA+ interfaces directly with bidirectional µP reset pins. A single external pullup resistor enables either the µP or MAX6302CSA+ to assert reset on the shared line. This configuration is explicitly validated in Figure 7 of the MAX6301–MAX6304 datasheet and requires no additional logic or level translation.
What capacitor type is recommended for SRT and SWT connections on MAX6302CSA+?
Ceramic capacitors are recommended for both SRT and SWT pins due to their low leakage (<10nA) and stable capacitance over temperature and voltage. Avoid electrolytic or tantalum types, whose leakage currents can introduce significant timing errors in the precision 500nA current-source-based timeout circuits. X7R or C0G dielectrics are preferred for stability.
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:
- 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+ 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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