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Analog Devices Inc./Maxim Integrated MAX6323BUT29-T
- Part No.:
- MAX6323BUT29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-6
- Datasheet:
-
MAX6323BUT29-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:2,657
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Product details
Overview
MAX6323BUT29-T from Maxim Integrated is a microprocessor supervisory circuit with windowed (min/max) watchdog, push-pull RESET output, and factory-trimmed 2.93V reset threshold (±2.5% accuracy). It monitors +2.5V to +5.0V supplies, guarantees valid RESET down to VCC = +1.2V, and operates across –40°C to +125°C for automotive and industrial control systems.
For engineers reviewing the MAX6323BUT29-T datasheet, MAX6323BUT29-T pinout, MAX6323BUT29-T application, or MAX6323BUT29-T equivalent, key selection criteria include its 15ms fast watchdog timeout (B-suffix), 300ms slow watchdog timeout (C-suffix), 100ms minimum reset timeout delay, 23µA typical supply current, and SOT23-6 package compatibility with space-constrained embedded designs.
Technical Context
The MAX6323BUT29-T implements a dual-window watchdog architecture: it detects both fast faults (WDI falling edges <15ms apart) and slow faults (no WDI edge >300ms), triggering a 1ms open-drain WDPO pulse. Its internal reset comparator guarantees monotonic assertion/deassertion with 20µs response to VCC transients.
RESET is push-pull active-low, asserted when VCC falls below 2.93V (typ) or MR is pulled low, and held for ≥100ms after VCC rises above threshold and MR releases. The device uses BiCMOS process (1371 transistors), supports debounced MR input with 1µs minimum pulse width, and features guaranteed operation down to VCC = +1.2V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93V (typ), ±2.5% accuracy - ensures reliable brownout detection for 3.0V/3.3V systems |
| Fast Watchdog Timeout | 15ms (max) - detects software loops executing too rapidly |
| Slow Watchdog Timeout | 300ms (max) - identifies stalled or hung processor execution |
| Reset Timeout Delay | 100ms (min) - provides sufficient hold time for µP initialization sequences |
| Supply Current | 23µA (typ at VCC = 2.5V/3.3V) - enables always-on monitoring in battery-backed systems |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial environments |
| VCC Range | 1.2V to 5.5V - supports valid RESET assertion even during deep brownout conditions |
Pinout & Package
MAX6323BUT29-T is housed in a 6-pin SOT23 package (package code U6+1A, outline 21-0058), with 1.6mm × 2.9mm footprint and 0.95mm height - suitable for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Active-low manual reset input | Internally pulled up; asserts RESET and clears watchdog on falling edge; 1µs min pulse width required |
| 2 - GND | Ground reference | Common return path for all internal circuits; must be low-impedance connection |
| 3 - WDI | Watchdog input | Falling-edge triggered; resets internal timer; 300ns min pulse width; rejects 100ns glitches |
| 4 - VCC | Supply voltage input | Monitored for reset generation; bypass with ≥500pF capacitor near pin for noise immunity |
| 5 - WDPO | Open-drain watchdog pulse output | Pulses low for 1ms (typ) on fast/slow fault; requires external pullup to ≤+6V |
| 6 - RESET | Active-low push-pull reset output | Drives µP reset pin directly; no external pullup needed; sinks current down to VCC = +1.2V |
Key Features
| Feature | Design Value |
|---|---|
| Windowed watchdog timer | Detects both premature (fast) and delayed (slow) WDI pulses - prevents false resets from jitter while catching hung code |
| Laser-trimmed reset threshold | 2.93V ±2.5% - eliminates need for external resistor divider in 3.0V system power monitoring |
| Guaranteed RESET validity to VCC = +1.2V | Ensures deterministic reset state during deep brownout - critical for fail-safe automotive ECUs |
| Debounced manual reset input | Internal 85kΩ pullup and 100ns glitch rejection - allows direct switch connection without RC network |
| Low quiescent current | 23µA typical - extends battery life in always-on monitoring applications such as telematics modules |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3V microcontroller supply and validates firmware execution timing in engine management systems. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout protection, and windowed watchdog supervision of main µP. Use Value: Prevents unsafe operation due to corrupted code or clock faults by asserting RESET within 100ms of VCC recovery and pulsing WDPO on timing violations. |
Use Scenario: Ensures deterministic startup and runtime integrity of programmable logic controller field I/O processors. IC Role / Device Role / Timing Role: System-level supervisor generating clean reset pulse and detecting µP hang via WDI interface. Use Value: Guarantees 100ms minimum reset hold time and 2.93V threshold accuracy for stable 3.0V rail monitoring in noisy factory environments. |
| Medical Infusion Pump Controller | Embedded Telematics Gateway |
Use Scenario: Provides safety-critical reset and watchdog supervision for ARM-based pump motor control MCU. IC Role / Device Role / Timing Role: Fail-safe supervisor with AEC-Q100-aligned reliability (via family qualification), ensuring compliance with IEC 62304. Use Value: Delivers guaranteed RESET down to VCC = +1.2V and 15ms/300ms watchdog windows to detect both rapid loop errors and complete firmware stalls. |
Use Scenario: Monitors 3.3V application processor supply and validates boot sequence timing in cellular-connected vehicle gateways. IC Role / Device Role / Timing Role: Low-power supervisory IC enabling always-on watchdog supervision without draining backup battery. Use Value: Achieves 23µA typical ICC and SOT23-6 footprint - essential for compact, energy-efficient telematics designs requiring long-term field reliability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6324BUT29-T | Open-drain RESET output instead of push-pull; identical watchdog and reset thresholds | Required when interfacing with bidirectional µP reset pins or level-shifting across multiple supply domains | Select MAX6324BUT29-T only if external pullup on RESET is acceptable and multi-supply reset coordination is needed |
| TPS3808G33DBVR | Fixed 3.3V reset threshold; no windowed watchdog - only basic timeout watchdog; 35µA ICC (higher than MAX6323BUT29-T) | Suitable for simpler systems where only power-on/brownout reset and single-interval watchdog are required | Choose TPS3808G33DBVR only when windowed watchdog functionality is unnecessary and 3.3V-only threshold suffices |
Compared with MAX6324BUT29-T, the MAX6323BUT29-T offers direct-drive RESET capability without external components; compared with TPS3808G33DBVR, it delivers superior fault coverage via min/max watchdog detection and tighter 2.93V threshold accuracy for 3.0V systems.
Availability
MAX6323BUT29-T is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6323BUT29-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6323/MAX6324 product line was designed specifically for fail-safe microprocessor supervision in harsh environments - delivering precision voltage monitoring, windowed watchdog timing, and guaranteed operation from –40°C to +125°C.
FAQ
What is the exact reset threshold voltage of MAX6323BUT29-T and how is it trimmed?
The MAX6323BUT29-T has a nominal reset threshold of 2.93V, with guaranteed tolerance of ±2.5% over –40°C to +125°C. This value is laser-trimmed at wafer test and corresponds to the "29" suffix in the part number, referencing the 2.85V to 3.00V range in the Reset Threshold Range table. The trimming ensures no external components are needed for accurate 3.0V system monitoring.
Does MAX6323BUT29-T support windowed watchdog functionality, and what are its timeout values?
Yes, MAX6323BUT29-T implements true windowed (min/max) watchdog supervision. The "B" in the part number specifies a fast timeout of 15ms (max) and the "C" (inferred from standard version listing MAX6323CUT29) sets the slow timeout at 300ms (max). These factory-trimmed windows detect both abnormally rapid and excessively delayed WDI pulses - critical for validating real-time software execution integrity.
What is the RESET output configuration of MAX6323BUT29-T, and how does it differ from MAX6324 variants?
MAX6323BUT29-T features a push-pull active-low RESET output, capable of directly driving µP reset pins without an external pullup resistor. In contrast, MAX6324BUT29-T uses an open-drain RESET output requiring an external pullup. This makes MAX6323BUT29-T ideal for single-supply systems where simplicity and reduced BOM count are priorities.
Can MAX6323BUT29-T operate reliably during deep brownout conditions?
Yes, MAX6323BUT29-T guarantees valid RESET assertion down to VCC = +1.2V - meaning the output remains functional and well-defined even as the supply collapses. This behavior is explicitly confirmed in the datasheet's Electrical Characteristics table and is essential for fail-safe shutdown sequencing in automotive and medical applications where partial power loss must trigger controlled reset.
What package type and footprint does MAX6323BUT29-T use, and are there thermal considerations?
MAX6323BUT29-T is supplied in a 6-pin SOT23 package (outline 21-0058, land pattern 90-0175), measuring 1.6mm × 2.9mm with 0.95mm height. Its thermal resistance is θJA = 115°C/W on multilayer board. For continuous operation at +125°C ambient, power dissipation must remain below 696mW (derated above +70°C), which is easily met given its 23µA typical supply current.
MAX6323BUT29-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Watchdog Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 100ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-6
MAX6323BUT29-T FAQ
1.How can I place an order for MAX6323BUT29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6323BUT29-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 MAX6323BUT29-T reliable?
The price and inventory of MAX6323BUT29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6323BUT29-T is usually 5 days.
3.What payment methods are accepted for MAX6323BUT29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6323BUT29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6323BUT29-T?
MAX6323BUT29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6323BUT29-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 MAX6323BUT29-T?
For technical support, including MAX6323BUT29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6323BUT29-T requirements.
6.How does Aetrix verify that MAX6323BUT29-T is sourced from the original manufacturer or authorized distributors?
All MAX6323BUT29-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 MAX6323BUT29-T meets industry standards.
7.What is the process for return or replacement of MAX6323BUT29-T?
All MAX6323BUT29-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6323BUT29-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 MAX6323BUT29-T part is unused and in its original packaging.
Return procedure for MAX6323BUT29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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