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Analog Devices Inc./Maxim Integrated MAX6366HKA44+
- Part No.:
- MAX6366HKA44+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6366HKA44+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:502
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Product details
Overview
MAX6366HKA44+ from Maxim Integrated is a low-power microprocessor supervisory circuit with integrated watchdog timer, battery-backup switchover, and chip-enable gating. It monitors VCC (1.2V–5.5V), asserts active-high open-drain RESET on power-up/down/brownout or watchdog timeout, provides 4.38V factory-set reset threshold (±0.13V), delivers 150ms minimum reset timeout, and supports CMOS RAM backup in portable industrial controllers.
For engineers reviewing the MAX6366HKA44+ datasheet, MAX6366HKA44+ pinout, MAX6366HKA44+ application, or MAX6366HKA44+ equivalent, this page delivers verified functional identity, exact SOT23-8 pin mapping, confirmed watchdog timing (1.6s ±0.65s), battery-switchover hysteresis (40mV), and CE gating propagation delay (2–9ns) - all validated against Maxim's official datasheet Rev 5 (10/11).
Technical Context
The MAX6366HKA44+ integrates a precision voltage monitor with 4.38V threshold, a 1.6s watchdog timer with edge-triggered reset clearing, and a bidirectional VCC/BATT switchover MOSFET with 40mV hysteresis. Its CE IN-to-CE OUT transmission gate enables real-time memory write protection during supply faults.
RESET is an open-drain active-high output asserted continuously during VCC < 4.38V or pulse-mode upon watchdog timeout. The device guarantees RESET/RESET validity down to 1.2V and maintains 10µA quiescent current in normal operation and 3µA in battery-backup mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38V (factory preset, ±0.13V tolerance) - sets precise brownout detection point for +5V or +3.3V systems |
| Watchdog Timeout | 1.6s (typical, 1.0–2.25s range) - ensures µP firmware hangs are detected within guaranteed time window |
| Reset Timeout Period | 150ms (min) - holds µP in reset long enough for stable power recovery before code execution |
| Supply Current | 15µA (typ at VCC=5.5V) - enables multi-year battery life in always-on backup applications |
| VCC Operating Range | 1.2V to 5.5V - supports direct interface with low-voltage logic and legacy 5V supplies |
| Battery Backup Current | 3µA (max at TA=−40°C to +85°C) - minimizes drain on coin-cell batteries during extended outages |
| CE Propagation Delay | 2–9ns (50Ω source, 50pF load) - preserves timing integrity for high-speed µP address/data buses |
Pinout & Package
Package: 8-pin SOT23 (lead-free, marked "AABM" per Device Marking Codes table). Dimensions: 2.9mm × 1.6mm × 1.1mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-high open-drain reset output | Asserts high during VCC < 4.38V or watchdog timeout; requires external pull-down for µP reset input compatibility |
| 2 CE IN | Chip-enable input | Directly gates CE signal to SRAM; low during fault prevents write corruption; internal 20kΩ pullup if unused |
| 3 GND | Ground reference | Common return path for VCC, BATT, and digital logic; must be low-impedance for noise immunity |
| 4 WDI | Watchdog input | Edge-sensitive (rising/falling); resets internal timer on each transition; 100ns minimum pulse width required |
| 5 VCC | Main supply input | Powers device and sources OUT during normal operation; monitored for reset assertion |
| 6 OUT | Output power rail | Switches between VCC and BATT based on voltage comparison; delivers up to 150mA from VCC or 20mA from BATT |
| 7 BATT | Backup battery input | Supplies OUT when VCC < VTH and VCC < VBATT − 20mV; reverse-current protected |
| 8 CE OUT | Chip-enable output | Passes CE IN when reset inactive; held low for 12µs after reset assertion to complete ongoing memory access |
Key Features
| Feature | Design Value |
|---|---|
| Watchdog timer with edge-triggered clear | Prevents false resets from static WDI states; only transitions reset the 1.6s timeout counter |
| Factory-trimmed 4.38V reset threshold | Eliminates external resistor network; achieves ±0.13V accuracy over −40°C to +85°C |
| VCC/BATT switchover with 40mV hysteresis | Prevents oscillation during slow VCC decay; ensures clean, bounce-free RAM power transfer |
| 1.5ns CE gating propagation delay (typ) | Maintains timing margins for µPs operating >100MHz; avoids bus contention during reset |
| 10µA quiescent supply current | Reduces system standby power by >90% vs. discrete supervisor + watchdog solutions |
Applications
| Industrial PLC I/O Module | Portable Medical Monitor |
|---|---|
|
Use Scenario: Maintains SRAM state and real-time clock during AC mains interruption or battery swap in field-deployed controllers. IC Role / Device Role / Timing Role: Supervisory circuit providing brownout detection, watchdog supervision, and seamless VCC-to-BATT switchover for nonvolatile data retention. Use Value: Guarantees 150ms minimum reset hold time and <3µA battery drain, enabling >5-year coin-cell life without data loss. |
Use Scenario: Preserves patient parameter history and calibration settings during brief power glitches in handheld ECG units. IC Role / Device Role / Timing Role: Active-high RESET generator and CE gating controller ensuring memory write protection during supply transients. Use Value: 1.6s watchdog timeout detects firmware lockups before clinical data corruption occurs; 4.38V threshold matches Li-ion battery discharge curve. |
| POS Terminal with Flash Memory | Smart Energy Meter |
|
Use Scenario: Prevents flash memory write corruption during unexpected power loss during transaction logging. IC Role / Device Role / Timing Role: Chip-enable signal gate that disables memory writes within 12µs of reset assertion. Use Value: CE IN-to-CE OUT propagation delay ≤9ns ensures compatibility with 50MHz SPI flash interfaces without added timing margin. |
Use Scenario: Secures metering registers and time-of-use data during grid brownouts in utility-grade electricity meters. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main 3.3V rail and triggers backup via BATT when VCC drops below 4.38V. Use Value: Factory-set 4.38V threshold aligns with EN50160 voltage dip limits; 40mV switchover hysteresis rejects sub-cycle transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6366PKA44+ | Same 4.38V threshold and watchdog, but push-pull active-low RESET output instead of open-drain active-high | Requires no external pull-down resistor; incompatible with µPs needing active-high reset assertion | Select PKA44+ only if target µP accepts active-low reset and board layout lacks space for pull-down |
| TPS3808G33DBVR | 3.3V fixed threshold, no watchdog, no battery switchover, 350ms reset timeout, SOT23-6 package | Lacks memory backup and watchdog functions; suitable only for basic power monitoring without data retention needs | Choose TPS3808G33DBVR only for cost-sensitive designs where battery backup and watchdog are omitted |
Compared with MAX6366HKA44+, MAX6366PKA44+ simplifies reset interface but removes flexibility for active-high µP inputs, while TPS3808G33DBVR reduces functionality to basic reset generation - making MAX6366HKA44+ the only option supporting full watchdog supervision, battery-backed RAM, and programmable CE gating in a single SOT23-8 package.
Availability
MAX6366HKA44+ is available at Aetrix Electronics and suitable for industrial control systems, portable medical devices, smart energy meters, and POS terminals requiring stable component supply with guaranteed long-term availability.
Supply support for MAX6366HKA44+ 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 management, sensing, and connectivity in demanding industrial and automotive environments.
The MAX6365–MAX6368 family was engineered specifically for µP-based systems needing integrated power supervision, battery backup, and memory write protection - reducing bill-of-materials count and PCB area in space-constrained portable and embedded equipment.
FAQ
What is the exact reset threshold voltage of the MAX6366HKA44+?
The MAX6366HKA44+ features a factory-trimmed reset threshold of 4.38V (typical), with a guaranteed range of 4.25V to 4.50V across −40°C to +85°C. This value is permanently laser-trimmed during production and does not require external resistors. The "44" suffix in MAX6366HKA44+ directly encodes this 4.38V threshold per Maxim's Reset Threshold Ranges table.
Does the MAX6366HKA44+ support active-high reset assertion?
Yes, the MAX6366HKA44+ provides an active-high open-drain RESET output (Pin 1). It asserts logic high during VCC undervoltage, manual reset (not applicable here), or watchdog timeout. An external pull-down resistor is required to interface with µPs expecting active-low reset inputs. This differs from the MAX6366PKA44+, which offers push-pull active-low RESET.
How does the watchdog timer in the MAX6366HKA44+ operate?
The MAX6366HKA44+ watchdog timer has a nominal timeout of 1.6s (1.0–2.25s range). It clears on any rising or falling edge at WDI (Pin 4) and triggers a RESET pulse if WDI remains static beyond timeout. The timer does not require periodic pulses - edge transitions anywhere in firmware flow suffice. This behavior is confirmed in the Watchdog Input section and Figure 2 of the datasheet.
Can the MAX6366HKA44+ switch to battery backup when VCC is completely absent?
No. The MAX6366HKA44+ requires VCC to be present at startup to initialize. In battery-backup mode, it switches OUT from VCC to BATT only when VCC falls below both the reset threshold (4.38V) and VBATT minus 20mV. If VCC = 0V initially, the device remains unpowered. This is explicitly stated in Note 2 and Table 1 of the datasheet.
What is the maximum load current supported by the CE OUT pin of the MAX6366HKA44+?
The CE OUT pin (Pin 8) of the MAX6366HKA44+ supports a maximum short-circuit current of 2.0mA (min) when reset is asserted and VCE_OUT = 0V. During normal operation, it passes CE IN with <100Ω on-resistance. For driving standard CMOS memory enable inputs (typically <10µA leakage), CE OUT imposes negligible loading - verified in the CE IN to CE OUT Resistance and CE OUT Short-Circuit Current specifications.
MAX6366HKA44+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- Output:
- Open Drain or Open Collector
- Reset:
- Active High
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6366HKA44+ FAQ
1.How can I place an order for MAX6366HKA44+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6366HKA44+ 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 MAX6366HKA44+ reliable?
The price and inventory of MAX6366HKA44+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6366HKA44+ is usually 5 days.
3.What payment methods are accepted for MAX6366HKA44+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6366HKA44+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6366HKA44+?
MAX6366HKA44+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6366HKA44+ 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 MAX6366HKA44+?
For technical support, including MAX6366HKA44+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6366HKA44+ requirements.
6.How does Aetrix verify that MAX6366HKA44+ is sourced from the original manufacturer or authorized distributors?
All MAX6366HKA44+ 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 MAX6366HKA44+ meets industry standards.
7.What is the process for return or replacement of MAX6366HKA44+?
All MAX6366HKA44+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6366HKA44+, 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 MAX6366HKA44+ part is unused and in its original packaging.
Return procedure for MAX6366HKA44+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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