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Analog Devices Inc./Maxim Integrated MAX6304CSA
- Part No.:
- MAX6304CSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6304CSA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,133
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Product details
Overview
MAX6304CSA from Maxim Integrated is an active-high, push-pull microprocessor supervisory circuit with adjustable reset threshold (≥1.22V), adjustable reset timeout (2.8–5.2 ms with 1500pF), and dual-mode watchdog timer (normal mode: 2.8–5.2 ms; extended mode: up to 2.6 s with same capacitor). It operates from 1.31V to 5.5V, draws only 4µA supply current, and is used in battery-powered embedded controllers requiring reliable power-on reset and hang detection.
For engineers reviewing the MAX6304CSA datasheet, MAX6304CSA pinout, MAX6304CSA application, or MAX6304CSA equivalent, key selection criteria include its active-high push-pull RESET output, 500× watchdog timeout multiplier via WDS pin, immunity to VCC transients ≤50µs at 100mV overdrive, and compatibility with low-leakage ceramic timing capacitors on SRT/SWT pins.
Technical Context
The MAX6304CSA implements a precision bandgap reference (1.22V) feeding a comparator for reset threshold generation, with external resistor divider scaling. Its reset timeout and watchdog timeout are set by precision 500nA current sources charging external capacitors at SRT and SWT pins respectively.
Watchdog operation supports two discrete modes: normal (WDS = GND) and extended (WDS = VCC), where the latter multiplies timeout by exactly 500× via internal counter scaling - not analog multiplication. The WDI input accepts ≥30ns pulses and clears the watchdog timer on any edge, while WDS transitions also reset the timer and change mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.31V to 5.5V - enables use with 1.8V, 2.5V, 3.3V, and 5V systems without level-shifting |
| Quiescent Supply Current | 4.0 µA typical - supports multi-year operation in coin-cell–powered portable equipment |
| Reset Threshold Accuracy | ±25 mV at 1.22V reference - allows precise brownout detection down to 1.22V × (R1+R2)/R2 |
| Reset Timeout (tRP) | 2.8–5.2 ms with 1500pF on SRT - configurable via external capacitor; timing error <±15% over temp |
| Watchdog Timeout (tWD) | 2.8–5.2 ms (normal) or 1.4–2.6 s (extended) with 1500pF on SWT - 500× scaling enabled by WDS high |
| RESET Output Type | Push-pull, active-high - drives high to VCC–0.3V at 0.8mA; sinks 3.2mA low; no external pullup required |
| Power-Supply Transient Immunity | Immune to negative-going VCC glitches ≤50µs duration at 100mV overdrive - prevents spurious resets in noisy environments |
Pinout & Package
MAX6304CSA is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, 150 mil width, with gull-wing leads and RoHS-compliant finish.
| 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 |
| 2 - GND | Analog and digital ground reference | Common return for internal comparators, current sources, and output drivers |
| 3 - SRT | Reset timeout capacitor connection | Sinks 500nA to ground; tRP = 2.67 × CSRT (pF) in µs - requires low-leakage ceramic cap |
| 4 - SWT | Watchdog timeout capacitor connection | Sinks 500nA to ground; tWD = 2.67 × CSWT (pF) in µs - same capacitor type requirement as SRT |
| 5 - WDS | Watchdog mode select input | Logic high selects 500× extended timeout; logic low selects normal timeout; edge-triggered reset of timer |
| 6 - WDI | Watchdog input | Rising or falling edge clears watchdog timer; in extended mode, unconnected WDI is auto-serviced at ~94% of tWD |
| 7 - RESET | Active-high push-pull reset output | Drives high to VCC–0.3V (min) at 0.8mA; sinks 3.2mA low; asserts high during fault conditions |
| 8 - VCC | Positive supply input | Must be bypassed with 0.1µF ceramic capacitor placed adjacent to pin; valid from 1.31V to 5.5V |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Settable to any voltage ≥1.22V using two external resistors - enables monitoring of non-5V rails like 3.3V or 1.8V |
| 500× watchdog timeout multiplier | Exact 500× extension via WDS pin - eliminates need for large-value timing capacitors in long-interval wake-up applications |
| Guaranteed RESET assertion at VCC ≥1.31V | Valid active-high output across full operating range - ensures deterministic behavior during power ramp-up |
| Power-supply transient immunity | Immunity to VCC glitches ≤50µs at 100mV overdrive - verified per Typical Operating Characteristics graph toc06 |
| Low-leakage timing interface | 500nA precision current sources at SRT/SWT - mandates low-leakage (<10nA) ceramic capacitors to avoid timing drift |
Applications
| Battery-Powered Portable Equipment | Embedded Controllers with Sleep/Wake Cycles |
|---|---|
Use Scenario: Handheld medical monitors powered by single Li-ion cell (3.0–4.2V) requiring reliable power-on initialization and low-power sleep mode. IC Role / Device Role / Timing Role: Supervises VCC rail; generates clean reset pulse on power-up; provides extended watchdog timeout to wake CPU every 20 seconds. Use Value: Enables >5-year battery life via 4µA quiescent current and eliminates need for external wake-up timer IC. |
Use Scenario: Industrial PLC controller that enters deep sleep between sensor polling intervals, waking only to process data. IC Role / Device Role / Timing Role: Acts as wake-up timer and hang detector: WDS toggled by firmware to switch between extended-mode wake-up and normal-mode watchdog. Use Value: Reduces system BOM count by replacing separate RTC + watchdog ICs; timing accuracy maintained via precision 500nA current sources. |
| Critical Microprocessor Monitoring | Set-Top Box Power Management |
Use Scenario: Automotive-grade infotainment head unit where software hangs must trigger immediate recovery without host MCU intervention. IC Role / Device Role / Timing Role: Monitors 3.3V core supply; asserts active-high RESET to processor's reset pin upon brownout or watchdog timeout. Use Value: Push-pull output guarantees fast, rail-to-rail reset assertion without pullup resistor - critical for meeting ASIL-B timing constraints. |
Use Scenario: Consumer set-top box with standby mode drawing <100µA, requiring glitch-immune reset during AC line disturbances. IC Role / Device Role / Timing Role: Supervises 5V standby rail; uses RESET IN to monitor auxiliary 3.3V LDO; rejects short VCC transients per toc06 curve. Use Value: Prevents false reboots during EFT bursts or lightning-induced surges - improves field reliability and user experience. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6302CSA | Active-high, open-drain RESET output; lacks push-pull drive strength | Requires external pullup resistor; unsuitable for high-speed or low-impedance reset lines | Select MAX6302CSA only when interfacing with legacy µPs requiring open-drain reset or level translation |
| MAX6303CSA | Active-low, push-pull RESET output; identical timing, threshold, and current specs | Direct replacement in circuits designed for active-low reset assertion (e.g., most ARM Cortex-M boot sequences) | Choose MAX6303CSA when board layout already uses active-low reset topology and no signal inversion is feasible |
Compared with MAX6302CSA and MAX6303CSA, the MAX6304CSA uniquely combines active-high polarity with push-pull drive - eliminating external components while maintaining full timing configurability and transient immunity, making it optimal for new designs targeting compactness and robustness.
Availability
MAX6304CSA is available at Aetrix Electronics and suitable for battery-powered portable equipment, embedded controllers with sleep/wake cycles, and critical microprocessor monitoring requiring stable component supply across industrial temperature ranges and long production lifecycles.
Supply support for MAX6304CSA 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 U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, communications, and computing markets.
The MAX6301–MAX6304 family was designed specifically for low-power microprocessor supervision in space-constrained, battery-sensitive applications - emphasizing ultra-low ICC, flexible reset configuration, and robust watchdog functionality without external logic.
FAQ
What is the minimum VCC required for guaranteed operation of the MAX6304CSA?
The MAX6304CSA guarantees functional operation and valid active-high RESET output down to VCC = 1.31V, as specified in the Electrical Characteristics table. Below this voltage, reset assertion is not assured. This makes the MAX6304CSA suitable for systems powered by partially discharged lithium batteries or low-voltage logic rails, unlike earlier variants such as the MAX6301 which guarantee operation only down to 1.00V.
How does the WDS pin affect watchdog timeout behavior in the MAX6304CSA?
In the MAX6304CSA, the WDS pin selects between two discrete watchdog modes: when pulled low (GND), it enables normal-mode timeout (e.g., 4.0 ms with 1500pF); when pulled high (VCC), it activates extended mode, multiplying the base timeout by exactly 500× (e.g., 2.0 s). A transition on WDS immediately resets the watchdog counter and changes mode - no delay or debounce is applied.
Can the MAX6304CSA monitor voltages other than VCC?
Yes, the MAX6304CSA can monitor any DC voltage via the RESET IN pin using an external resistor divider. The device references its internal 1.22V bandgap, so VRST = 1.22 × (R1 + R2)/R2. This allows direct supervision of 3.3V, 2.5V, or 1.8V rails - or even battery voltage - without additional op-amps or level shifters, as confirmed in Figure 4 of the datasheet.
What capacitor type is required for accurate timing on SRT and SWT pins of the MAX6304CSA?
The MAX6304CSA requires low-leakage ceramic capacitors (≤10nA leakage) on both SRT and SWT pins because its internal 500nA timing current sources are highly sensitive to parasitic leakage. X7R or C0G dielectrics are recommended; aluminum electrolytic or tantalum capacitors are unsuitable due to higher leakage, which would cause significant timing errors in reset and watchdog periods.
Is the MAX6304CSA pin-compatible with other members of the MAX6301–MAX6304 family?
Yes, the MAX6304CSA shares identical 8-pin SO packaging and pinout with all MAX6301–MAX6304 variants, including MAX6301CSA, MAX6302CSA, and MAX6303CSA. This allows drop-in replacement within the same temperature grade (C-grade: 0°C to +70°C) when output polarity and drive type match system requirements - though firmware may need adjustment for active-high vs. active-low logic.
MAX6304CSA 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:
- Push-Pull, Totem Pole
- 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
MAX6304CSA FAQ
1.How can I place an order for MAX6304CSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6304CSA 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 MAX6304CSA reliable?
The price and inventory of MAX6304CSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6304CSA is usually 5 days.
3.What payment methods are accepted for MAX6304CSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6304CSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6304CSA?
MAX6304CSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6304CSA 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 MAX6304CSA?
For technical support, including MAX6304CSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6304CSA requirements.
6.How does Aetrix verify that MAX6304CSA is sourced from the original manufacturer or authorized distributors?
All MAX6304CSA 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 MAX6304CSA meets industry standards.
7.What is the process for return or replacement of MAX6304CSA?
All MAX6304CSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX6304CSA, 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 MAX6304CSA part is unused and in its original packaging.
Return procedure for MAX6304CSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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