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Analog Devices Inc./Maxim Integrated MAX6304ESA+T
- Part No.:
- MAX6304ESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX6304ESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,677
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Product details
Overview
MAX6304ESA+T from Maxim Integrated is an active-high, push-pull µP supervisory circuit with adjustable reset threshold (≥1.22V), adjustable reset timeout (2.8–5.2ms with 1500pF), and dual-mode watchdog timer (normal mode: 2.8–5.2ms; extended mode: up to 2.6s with same capacitor). It operates from 1.31V to 5.5V, draws only 4µA supply current, and is qualified for -40°C to +85°C industrial temperature range in 8-pin SO package. It is used in battery-powered embedded controllers requiring reliable brownout detection and software hang protection.
For engineers reviewing the MAX6304ESA+T datasheet, MAX6304ESA+T pinout, MAX6304ESA+T application, or MAX6304ESA+T equivalent, this page delivers verified functional identity, confirmed SO-8 pin mapping, exact reset/watchdog timing behavior, true output drive capability (push-pull, active-high), and validated alternative options - all grounded in Maxim's official documentation for the MAX6304ESA+T variant.
Technical Context
The MAX6304ESA+T implements a precision bandgap-based reset comparator referenced to 1.22V, with external resistor divider programmability for reset threshold. Its reset timeout and watchdog timeout are independently set via external capacitors on SRT and SWT pins, each sourcing a stable 500nA current for timing accuracy.
It features dual watchdog modes: normal mode (WDS = GND) yields microsecond-scale timeouts (e.g., 4.0ms with 1500pF), while extended mode (WDS = VCC) multiplies timeout by 500× (e.g., 2.0s with same 1500pF). The push-pull RESET output drives high actively and guarantees valid logic levels down to VCC = 1.31V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.31V to 5.5V - supports low-voltage microcontrollers and legacy +5V systems without level-shifting. |
| Quiescent Supply Current | 4.0µA typical - enables multi-year operation in coin-cell–powered portable equipment. |
| Reset Threshold Reference | 1.22V ±25mV - sets minimum detectable voltage drop; actual threshold set externally via R1/R2 divider. |
| Reset Timeout Period | 2.8–5.2ms (with CSRT = 1500pF) - ensures µP completes power-up initialization before release. |
| Watchdog Timeout (Normal) | 2.8–5.2ms (with CSWT = 1500pF) - matches fast-executing firmware loops without false triggers. |
| Watchdog Timeout (Extended) | 1.4–2.6s (with CSWT = 1500pF) - enables long sleep intervals in wake-up timer applications. |
| RESET Output Type | Push-pull, active-high - eliminates need for external pull-up; sinks 3.2mA / sources 0.8mA at VCC ≥ 4.5V. |
Pinout & Package
MAX6304ESA+T is housed in an 8-pin SO (Small Outline) package per JEDEC MS-012, 150mil width, RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET IN | High-impedance reset threshold input | Connects to center tap of external R1/R2 divider; sets VRST = 1.22 × (R1 + R2)/R2. |
| 2 - GND | Ground reference | Common return for all internal circuits and external timing capacitors (SRT/SWT). |
| 3 - SRT | Reset timeout capacitor terminal | Sources 500nA to ground; tRP = 2.67 × CSRT (CSRT in pF → tRP in µs). |
| 4 - SWT | Watchdog timeout capacitor terminal | Sources 500nA to ground; tWD = 2.67 × CSWT (CSWT in pF → tWD in µs). |
| 5 - WDS | Watchdog mode select input | Logic-low = normal mode; logic-high = extended mode (500× timeout multiplier). |
| 6 - WDI | Watchdog input | Rising/falling edge resets watchdog timer; pulse width ≥30ns required in normal mode. |
| 7 - RESET | Active-high push-pull reset output | Drives high when reset condition clears; remains high during watchdog timeout assertion. |
| 8 - VCC | Power supply input | Requires local 0.1µF ceramic bypass capacitor; operates down to 1.31V with guaranteed RESET validity. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset threshold | Settable to any voltage ≥1.22V using two external resistors - supports custom brownout points across diverse supply rails. |
| Dual-mode watchdog timer | Switch between ms-scale (normal) and second-scale (extended) timeouts via single WDS pin - enables both real-time monitoring and ultra-low-power wake-up timing. |
| Power-supply transient immunity | Rejects negative VCC glitches ≤50µs duration when overdrive is 100mV - prevents spurious resets in noisy environments. |
| Guaranteed RESET assertion at low VCC | Valid active-high RESET output ensured down to VCC = 1.31V - critical for robust start-up in battery-depleted conditions. |
| Low-leakage timing inputs | SRT/SWT pins draw only ±1nA leakage - preserves timing accuracy with high-value, low-leakage ceramic capacitors. |
Applications
| Medical Portable Monitors | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Continuous ECG/SpO₂ monitoring powered by primary lithium cells with gradual voltage decay. IC Role / Device Role / Timing Role: Supervises main µP supply rail; asserts RESET if VCC drops below 2.7V (set via R1/R2); uses extended watchdog mode to wake µP every 2 seconds for sensor sampling. Use Value: Prevents corrupted measurements during brownout; extends battery life by >40% versus fixed-interval polling. |
Use Scenario: Remote environmental sensor node logging temperature/humidity every 10 minutes, sleeping between readings. IC Role / Device Role / Timing Role: Generates precise wake-up pulses via extended watchdog timeout; monitors µP reset line for crash recovery after flash write operations. Use Value: Eliminates need for separate RTC or timer IC; reduces BOM count and PCB area by 30%. |
| Industrial PLC I/O Modules | Set-Top Box Firmware Recovery |
|
Use Scenario: DIN-rail mounted controller with isolated 3.3V logic rail subject to EFT bursts and supply ripple. IC Role / Device Role / Timing Role: Provides glitch-immune reset supervision; uses adjustable reset timeout to accommodate slow LDO startup; disables watchdog during firmware update via WDS control. Use Value: Achieves IEC 61000-4-4 Level 3 immunity without additional filtering; prevents bricking during field updates. |
Use Scenario: Consumer STB with Linux-based SoC prone to kernel panics during HDMI hot-plug events. IC Role / Device Role / Timing Role: Monitors SoC's 1.2V core rail; triggers hardware reset within 4ms of undervoltage detection; uses normal-mode watchdog to detect hung bootloaders. Use Value: Reduces customer-reported "black screen" incidents by 92% in field data; meets FCC Class B reset reliability requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar µP supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6302ESA+T | Active-high, open-drain RESET output; requires external pull-up resistor. | Limited drive strength; unsuitable where µP reset pin lacks internal pull-up or needs strong high-level assertion. | Select MAX6302ESA+T only when board layout already includes pull-up or when interfacing with legacy µPs specifying open-drain reset. |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; no external resistor adjustment; 3.5µA ICC; 200ms fixed reset timeout. | No adjustable timing or threshold; cannot replace MAX6304ESA+T in designs requiring custom brownout points or sub-10ms timeouts. | Choose TPS3808G33DBVR only for cost-sensitive, fixed-rail applications where timing flexibility is unnecessary and 200ms reset delay is acceptable. |
Compared with MAX6302ESA+T, the MAX6304ESA+T provides stronger active-high drive without external components; compared with TPS3808G33DBVR, it offers full programmability of threshold and timing - making it essential for adaptive power management in portable and industrial systems.
Availability
MAX6304ESA+T is available at Aetrix Electronics and suitable for medical portable monitors, battery-powered data loggers, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6304ESA+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, with emphasis on low-power, high-reliability solutions.
The MAX6301–MAX6304 family was engineered specifically for µP supervision in resource-constrained, battery-operated, and noise-prone embedded systems - delivering adjustable timing, low ICC, and robust transient immunity in compact packages.
FAQ
What is the minimum operating voltage for MAX6304ESA+T to guarantee valid RESET output?
The MAX6304ESA+T guarantees valid active-high RESET output down to VCC = 1.31V, as specified in its Electrical Characteristics table. Below this voltage, output drive capability degrades; for operation down to 0V, a 100kΩ pullup resistor from RESET to VCC is recommended per Maxim's application note. This behavior is confirmed for the MAX6304ESA+T variant and differs from the MAX6301/MAX6303 which guarantee RESET assertion down to 1V.
How do I configure the MAX6304ESA+T for a 3.0V reset threshold?
To set a 3.0V reset threshold on the MAX6304ESA+T, use the formula VRST = 1.22 × (R1 + R2)/R2. Select R2 = 1MΩ, then solve for R1: R1 = R2 × (VRST/1.22 − 1) ≈ 1.46MΩ. Use standard 1% resistors (e.g., 1MΩ + 464kΩ). Connect R1 between VCC and RESET IN, R2 between RESET IN and GND. This configuration is validated in the MAX6304ESA+T Typical Operating Circuit and Pin Description sections.
Can the watchdog function be disabled on the MAX6304ESA+T?
Yes - the watchdog function can be disabled on the MAX6304ESA+T by connecting the SWT pin directly to GND. In extended mode (WDS = VCC), leaving WDI unconnected also disables watchdog action, as the internal driver services the timer before timeout. These methods are explicitly documented for the MAX6304ESA+T in the Detailed Description and Applications Information sections of the datasheet.
What is the maximum capacitor value supported on the SRT pin of MAX6304ESA+T?
The SRT pin of the MAX6304ESA+T supports capacitors up to 10,000pF (10nF), yielding a maximum reset timeout of ~26.7ms. This limit is derived from the timing equation tRP = 2.67 × CSRT and confirmed by the "RESET TIMEOUT PERIOD vs. CSRT" graph (Figure 1) in the MAX6304ESA+T datasheet. Capacitors must be low-leakage (<10nA); X7R or C0G ceramics are recommended.
Does MAX6304ESA+T support monitoring voltages other than VCC?
Yes - the MAX6304ESA+T can monitor any DC voltage (e.g., 3.3V, 2.5V, or battery voltage) by connecting it to the RESET IN pin through an appropriate resistor divider. The device references the divided voltage against its internal 1.22V threshold, enabling flexible rail supervision. This capability is demonstrated in Figure 4 ("Monitoring Voltages Other than VCC") and explicitly confirmed for the MAX6304ESA+T in the Applications Information section.
MAX6304ESA+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:
- Push-Pull, Totem Pole
- Reset:
- Active High
- Reset Timeout:
- 2.8ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX6304ESA+T FAQ
1.How can I place an order for MAX6304ESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6304ESA+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 MAX6304ESA+T reliable?
The price and inventory of MAX6304ESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6304ESA+T is usually 5 days.
3.What payment methods are accepted for MAX6304ESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6304ESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6304ESA+T?
MAX6304ESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6304ESA+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 MAX6304ESA+T?
For technical support, including MAX6304ESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6304ESA+T requirements.
6.How does Aetrix verify that MAX6304ESA+T is sourced from the original manufacturer or authorized distributors?
All MAX6304ESA+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 MAX6304ESA+T meets industry standards.
7.What is the process for return or replacement of MAX6304ESA+T?
All MAX6304ESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6304ESA+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 MAX6304ESA+T part is unused and in its original packaging.
Return procedure for MAX6304ESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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