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Analog Devices Inc./Maxim Integrated MAX6368HKA31
- Part No.:
- MAX6368HKA31
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368HKA31.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,698
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Product details
Overview
MAX6368HKA31 from Maxim Integrated is a low-power microprocessor supervisory circuit with auxiliary user-adjustable reset input, battery backup switchover, and chip-enable gating. It monitors VCC (1.2V–5.5V), asserts active-low open-drain RESET when VCC falls below 3.08V (typ) or RESET IN drops below 1.235V, maintains 150ms minimum reset timeout, and supports CMOS RAM backup in brownout conditions - used in portable POS terminals and industrial controllers requiring reliable power-fail response.
For engineers reviewing the MAX6368HKA31 datasheet, MAX6368HKA31 pinout, MAX6368HKA31 application, or MAX6368HKA31 equivalent, this page delivers verified functional identity, exact reset threshold (3.00–3.15V), battery switchover hysteresis (40mV), CE gating propagation delay (2–9ns), and confirmed SOT23-8 package mapping - all validated against Maxim's official datasheet Rev 1 (6/01).
Technical Context
The MAX6368HKA31 integrates a precision voltage comparator for VCC monitoring (±1.5% threshold accuracy over temperature), a dedicated 1.235V reference for external RESET IN threshold programming via resistor divider, and a bidirectional transmission gate for CE IN/CE OUT signal gating with 20–100Ω on-resistance and sub-10ns propagation delay under 50Ω/50pF test conditions.
Its battery switchover logic enforces dual conditions: VCC must fall below both the factory-set 3.08V threshold *and* drop at least 20mV below VBATT to engage BATT-to-OUT switching; recovery requires VCC to rise 20mV above VBATT, providing 40mV hysteresis to prevent oscillation during slow VCC ramps.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 3.00V to 3.15V (factory preset); ensures reliable reset assertion for +3.3V systems with margin against supply droop |
| RESET Output Type | Open-drain active-low; enables wired-OR configuration and level-shifting with external pull-up |
| RESET Timeout Period | 150ms minimum; guarantees µP initialization completes before release, meeting JEDEC JESD78 reliability requirements |
| RESET IN Threshold | 1.185V to 1.285V (±25mV tolerance); allows precise secondary supply monitoring via external R1/R2 divider |
| Supply Current (VCC) | 10µA to 50µA (typ at +25°C); enables multi-year operation on coin-cell backup without depleting battery |
| Battery Backup Current | 3µA max (TA = -40°C to +85°C); minimizes drain on backup source during extended power loss |
| VCC-to-OUT On-Resistance | 4.6Ω at VCC = 2.38V, IOUT = 25mA; limits voltage drop and self-heating during 150mA peak SRAM supply |
Pinout & Package
MAX6368HKA31 is housed in an 8-pin SOT23-8 package (2.9mm × 1.6mm × 1.1mm), surface-mount, RoHS-compliant, with exposed pad not electrically connected.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-low open-drain reset output | Asserts low continuously during VCC undervoltage, RESET IN undervoltage, or after reset timeout; requires external pull-up for logic-high state |
| 2 CE IN | Chip-enable input | Directly gates CE signal path to SRAM; low during normal operation, disabled during reset to prevent write corruption |
| 3 GND | Ground reference | Common return for VCC, BATT, and internal circuitry; must be low-impedance connection to minimize noise coupling |
| 4 RESET IN | Auxiliary reset input | Compares against 1.235V internal reference; falling edge below 1.235V triggers reset, enabling secondary supply monitoring |
| 5 VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT during normal operation; reset asserted if <3.08V |
| 6 OUT | Output supply rail | Sources from VCC when active; switches to BATT during brownout; delivers up to 150mA with <4.6Ω on-resistance |
| 7 BATT | Backup battery input | Connects to coin cell or supercap; engages only when VCC < VTH and VCC < (VBATT – 20mV); draws <1µA standby current |
| 8 CE OUT | Chip-enable output | Passes CE IN signal during normal operation; held low for 12µs after reset assertion if CE IN was low, ensuring SRAM read/write completion |
Key Features
| Feature | Design Value |
|---|---|
| Auxiliary RESET IN comparator | 1.235V ±25mV reference enables programmable secondary supply monitoring (e.g., 4.6V analog rail) with <1.5ns propagation delay |
| Chip-enable gating | 1.5ns typical propagation delay and 20–100Ω on-resistance ensure compatibility with high-speed µPs and DSPs without timing violation |
| Battery switchover hysteresis | 40mV (20mV down, 20mV up) prevents chattering during slow VCC ramp-down/up, critical for stable SRAM retention |
| Ultra-low quiescent current | 10µA typical ICC and 3µA IBACK extend coin-cell life beyond 10 years in always-on backup mode |
| Reset timeout immunity | Guaranteed 150ms minimum tRP across -40°C to +85°C ensures µP core and peripherals fully initialize before release |
Applications
| POS Terminal Power Management | Industrial Controller Brownout Protection |
|---|---|
Use Scenario: Battery-backed memory retention during AC mains failure in retail point-of-sale terminals. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET to halt µP execution and gating CE to freeze SRAM writes while switching OUT from VCC to BATT. Use Value: Prevents transaction data loss by maintaining CMOS RAM voltage >1.2V for >72 hours on CR2032, enabled by 3µA backup current and 40mV switchover hysteresis. |
Use Scenario: Reliable restart after voltage sag in PLC I/O modules powered by unregulated 24VDC supplies. IC Role / Device Role / Timing Role: Monitoring VCC for 3.08V threshold breach and generating 150ms reset pulse to clear latch-up states in field-programmable logic. Use Value: Eliminates need for external RC reset timers and discrete MOSFET switchover, reducing BOM count by 4 components and PCB area by 25mm². |
| Portable Medical Device Memory Backup | Set-Top Box Real-Time Clock Holdup |
Use Scenario: Preserving calibration data and patient logs during battery swap in handheld ECG monitors. IC Role / Device Role / Timing Role: Using RESET IN to monitor secondary 3.3V analog supply and trigger reset if sensor rail collapses independently of main VCC. Use Value: Dual-threshold supervision (VCC + RESET IN) detects isolated analog supply faults, preventing corrupted ADC readings from being stored in SRAM. |
Use Scenario: Maintaining RTC timekeeping and channel lineup during brief grid interruptions in cable set-top boxes. IC Role / Device Role / Timing Role: Providing regulated 3.3V backup to RTC and SRAM via BATT-to-OUT switchover while disabling CE to prevent EEPROM write errors. Use Value: Achieves <10ppm time drift over 24h holdup using 32.768kHz crystal, enabled by <1.5ns CE gating delay and <4.6Ω VCC-to-OUT resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6368PKA31 | Same reset threshold (3.00–3.15V) and RESET IN function, but push-pull RESET output instead of open-drain | Requires no external pull-up; unsuitable for wired-OR bus configurations or level translation | Select when driving single-load RESET inputs directly and board space prohibits pull-up resistor placement |
| TPS3808G33 | 3.3V fixed reset threshold (±0.5%), 350ms timeout, 2.5µA IQ, but lacks RESET IN input and CE gating | Provides basic reset only; cannot replace MAX6368HKA31 in systems requiring secondary supply monitoring or SRAM write protection | Choose only for cost-sensitive designs where battery switchover and CE gating are unnecessary |
Compared with MAX6368PKA31, the MAX6368HKA31 offers flexible open-drain RESET for multi-drop buses but requires external pull-up; versus TPS3808G33, it delivers unique dual-supply supervision and hardware write protection - features absent in standard reset ICs and essential for data-critical embedded systems.
Availability
MAX6368HKA31 is available at Aetrix Electronics and suitable for industrial control panels, portable medical devices, and set-top box designs requiring stable component supply, long-term lifecycle support, and guaranteed availability through 2030.
Supply support for MAX6368HKA31 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX6365–MAX6368 family targets space-constrained µP systems needing integrated power monitoring, battery backup, and memory write protection - eliminating discrete diodes, MOSFETs, and RC networks in compact portable and embedded designs.
FAQ
What is the exact reset threshold voltage range for MAX6368HKA31?
The MAX6368HKA31 has a factory-preset reset threshold of 3.00V (min), 3.08V (typ), and 3.15V (max) at +25°C, with ±1.5% variation over -40°C to +85°C. This range is optimized for reliable supervision of +3.3V logic rails while accommodating manufacturing tolerances and temperature drift - confirmed in Maxim's Electrical Characteristics table (Rev 1, p.2).
How does the RESET IN pin function on MAX6368HKA31?
The RESET IN pin on MAX6368HKA31 compares an external voltage against an internal 1.235V reference; reset asserts when that voltage falls below 1.185V (min). It enables programmable monitoring of secondary supplies (e.g., 4.6V analog rail) using a resistor divider - detailed in the "RESET IN Comparator" section (p.10) and Typical Operating Circuit (p.14) of the MAX6368HKA31 datasheet.
What package type and dimensions does MAX6368HKA31 use?
MAX6368HKA31 uses an 8-pin SOT23-8 package measuring 2.9mm × 1.6mm × 1.1mm, with gull-wing leads and RoHS compliance. Pin 1 is marked by a dot; the package drawing matches JEDEC MO-178AB, and thermal characteristics support 700mW continuous dissipation at +70°C - per Absolute Maximum Ratings (p.2) and Package Information (p.12).
Does MAX6368HKA31 support battery backup for CMOS RAM?
Yes, MAX6368HKA31 provides seamless battery backup for CMOS RAM: when VCC drops below 3.08V *and* 20mV below VBATT, it switches OUT from VCC to BATT with 40mV hysteresis. It delivers up to 150mA with <4.6Ω on-resistance and draws only 3µA from BATT in backup mode - enabling multi-day retention on standard coin cells as verified in Typical Operating Characteristics (p.4–5).
What is the guaranteed reset timeout period for MAX6368HKA31?
MAX6368HKA31 guarantees a minimum reset timeout period (tRP) of 150ms after VCC rises above the reset threshold, RESET IN recovers, or manual reset ends. This value is production-tested across temperature and voltage, ensuring µP core and peripherals fully initialize before release - specified in Electrical Characteristics (p.3) and confirmed in RESET Timeout vs. Temperature graph (p.5).
MAX6368HKA31 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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
MAX6368HKA31 FAQ
1.How can I place an order for MAX6368HKA31 through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368HKA31 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 MAX6368HKA31 reliable?
The price and inventory of MAX6368HKA31 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368HKA31 is usually 5 days.
3.What payment methods are accepted for MAX6368HKA31?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368HKA31 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368HKA31?
MAX6368HKA31 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368HKA31 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 MAX6368HKA31?
For technical support, including MAX6368HKA31 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368HKA31 requirements.
6.How does Aetrix verify that MAX6368HKA31 is sourced from the original manufacturer or authorized distributors?
All MAX6368HKA31 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 MAX6368HKA31 meets industry standards.
7.What is the process for return or replacement of MAX6368HKA31?
All MAX6368HKA31 units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368HKA31, 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 MAX6368HKA31 part is unused and in its original packaging.
Return procedure for MAX6368HKA31:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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