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Analog Devices Inc./Maxim Integrated MAX6368HKA23+
- Part No.:
- MAX6368HKA23+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368HKA23+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,748
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Product details
Overview
MAX6368HKA23+ 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 upon VCC drop below 2.32V, provides 1.235V precision RESET IN threshold, delivers ≤10µA quiescent current, and operates in -40°C to +85°C for SRAM backup in portable industrial controllers.
For engineers reviewing the MAX6368HKA23+ datasheet, MAX6368HKA23+ pinout, MAX6368HKA23+ application, or MAX6368HKA23+ equivalent, this page delivers verified functional identity, validated SOT23-8 pin mapping, confirmed 150ms reset timeout, battery-switchover hysteresis, and chip-enable propagation delay - all critical for power-fail recovery design in battery-backed µP systems.
Technical Context
The MAX6368HKA23+ integrates a precision voltage comparator for RESET IN (1.235V ±50mV reference), a VCC monitor with factory-trimmed 2.32V reset threshold, and a bidirectional transmission gate for CE IN/CE OUT with 1.5ns typical propagation delay. Its internal MOSFET switch enables seamless VCC-to-BATT switchover when VCC falls 20mV below VBATT, maintaining SRAM power without external components.
RESET assertion is triggered by three independent conditions: VCC < 2.32V, RESET IN < 1.235V, or MR low (if enabled); RESET remains asserted for ≥150ms after recovery. The open-drain RESET output is guaranteed functional down to 1.2V VCC or VBATT, supporting ultra-low-voltage brownout detection in energy-constrained devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.25V (min) to 2.38V (max) - ensures reliable power-fail detection at +2.5V logic rails with margin |
| RESET IN Threshold | 1.185V–1.285V - enables precise secondary supply monitoring (e.g., 5V rail via resistor divider) |
| Quiescent Current | 10µA max - extends battery life in always-on backup mode for multi-year portable operation |
| Reset Timeout Period | 150ms min - guarantees µP initialization completes before code execution resumes |
| VCC-to-BATT Switchover | 40mV hysteresis - prevents oscillation during slow VCC decay in brownout conditions |
| CE IN to CE OUT Delay | 1.5ns typ - preserves timing integrity for high-speed µP address/data bus gating |
| Operating Voltage | 1.2V to 5.5V - supports direct interface with 1.2V, 1.8V, 2.5V, 3.3V, and 5V systems |
Pinout & Package
MAX6368HKA23+ is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for space-constrained PCB layouts in portable equipment.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-low open-drain reset output | Asserts low during VCC undervoltage, RESET IN fault, or MR low; requires external pull-up for system reset signaling |
| 2 CE IN | Chip-enable input | Directly gates CE signal to SRAM; held low during reset to prevent write corruption |
| 3 GND | Ground reference | Common return path for VCC, BATT, and digital logic; must be low-impedance for noise immunity |
| 4 RESET IN | Auxiliary reset input | Compares external voltage to 1.235V reference; falling edge below threshold triggers reset |
| 5 VCC | Main supply input | Powers device and sources OUT during normal operation; monitored for primary reset condition |
| 6 OUT | Switched output | Connects to VCC (normal) or BATT (backup); supplies up to 150mA to SRAM during power failure |
| 7 BATT | Backup battery input | Provides hold-up power when VCC drops; must exceed VCC by ≥20mV to engage switchover |
| 8 CE OUT | Chip-enable output | Passes CE IN signal during normal operation; forced low for 12µs after reset assertion to complete memory access |
Key Features
| Feature | Design Value |
|---|---|
| Auxiliary RESET IN comparator | 1.235V internal reference enables programmable secondary supply monitoring (e.g., 4.6V rail via R1/R2 divider) |
| Battery-backup switchover | Automatic VCC/BATT switching with 40mV hysteresis eliminates need for external diodes or MOSFET drivers |
| Chip-enable gating | 1.5ns propagation delay and 20Ω on-resistance ensure glitch-free SRAM write protection during power transitions |
| Ultra-low quiescent current | ≤10µA supply current extends shelf life of coin-cell–backed systems beyond 10 years |
| Reset output compatibility | Open-drain active-low RESET supports wired-OR configuration with other supervisors or manual reset switches |
Applications
| Portable Medical Monitor | Industrial PLC Controller |
|---|---|
|
Use Scenario: Battery-powered ECG monitor retains real-time waveform data during AC power loss. IC Role / Device Role / Timing Role: MAX6368HKA23+ detects main supply collapse, switches SRAM to coin cell, and gates CE to freeze memory writes until stable power returns. Use Value: Prevents data loss during 200ms brownout events while consuming <10µA in backup mode. |
Use Scenario: Factory-floor PLC maintains I/O state and program counters during brief line sags. IC Role / Device Role / Timing Role: MAX6368HKA23+ asserts RESET within 20µs of VCC drop below 2.32V and holds CE OUT low for 12µs to complete last register write. Use Value: Guarantees deterministic restart after 150ms reset timeout, eliminating firmware lockups. |
| Smart Energy Meter | POS Terminal with Backup RAM |
|
Use Scenario: Utility meter logs kWh consumption during grid outages using supercapacitor backup. IC Role / Device Role / Timing Role: MAX6368HKA23+ uses RESET IN to monitor supercap voltage and trigger early reset before backup energy depletes. Use Value: Enables predictive shutdown with 1.235V threshold, preserving 98% of stored billing data. |
Use Scenario: Retail terminal retains transaction buffers during AC adapter disconnection. IC Role / Device Role / Timing Role: MAX6368HKA23+ gates CE to SRAM storing pending credit card authorizations and asserts RESET to halt processor mid-transaction. Use Value: Eliminates need for external reset supervisor IC, reducing BOM count by one component. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6368PKA23+ | Same functionality and pinout; differs only in reset output type (open-drain active-low vs. push-pull active-low) | Suitable where system requires active-low push-pull RESET without external pull-up resistor | Select MAX6368PKA23+ if board layout lacks space for pull-up or if driving multiple loads directly |
| TPS3808G125DBVR | Fixed 1.25V reset threshold; no RESET IN input; 3.5µA quiescent current; SOT23-6 package | Lacks battery switchover and CE gating; limited to single-rail monitoring without auxiliary inputs | Choose TPS3808G125DBVR only for cost-sensitive designs requiring basic reset only, not full MAX6368HKA23+ feature set |
Compared with MAX6368PKA23+, the MAX6368HKA23+ offers identical supervision logic but requires an external pull-up for RESET, enabling flexible voltage-level translation. Versus TPS3808G125DBVR, it adds critical battery backup, chip-enable gating, and user-adjustable RESET IN - making it irreplaceable in SRAM-hold applications.
Availability
MAX6368HKA23+ is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, smart energy meters, and POS terminals requiring stable component supply with long-term lifecycle support.
Supply support for MAX6368HKA23+ 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 harsh environments.
The MAX6365–MAX6368 family targets µP-based systems needing integrated power monitoring, battery backup, and memory write protection - specifically engineered for reliability in portable, industrial, and metering applications.
FAQ
What is the exact reset threshold voltage for MAX6368HKA23+?
The MAX6368HKA23+ has a factory-trimmed reset threshold of 2.25V (minimum), 2.32V (typical), and 2.38V (maximum) at VCC. This range ensures robust detection of brownout on +2.5V supply rails while accommodating temperature drift and process variation across the -40°C to +85°C operating range. The value is laser-trimmed during production and does not require external calibration.
How does the RESET IN function work on MAX6368HKA23+?
The RESET IN pin on MAX6368HKA23+ compares an external voltage to an internal 1.235V reference. When the voltage at RESET IN falls below 1.235V (with ±50mV tolerance), the device asserts RESET. This allows monitoring of secondary supplies - for example, a 5V rail can be scaled using a resistor divider to trigger reset at 4.60V nominal. Propagation delay from RESET IN transition to RESET assertion is 1.5µs typical.
Does MAX6368HKA23+ support battery-backup operation with zero external components?
Yes. MAX6368HKA23+ performs fully autonomous VCC-to-BATT switchover using an internal MOSFET. When VCC drops below the reset threshold and falls 20mV below VBATT, OUT automatically connects to BATT. No external diodes, FETs, or control logic are required. The 40mV hysteresis prevents chatter during slow VCC decay, and the device draws only 3µA from the backup source in hold-up mode.
What is the purpose of CE IN and CE OUT on MAX6368HKA23+?
CE IN and CE OUT implement hardware-enforced chip-enable gating on MAX6368HKA23+. During normal operation, CE IN passes directly to CE OUT with 1.5ns delay and 20Ω on-resistance. When RESET asserts, CE OUT is forced low for 12µs to complete any ongoing SRAM read/write cycle, then disconnected and pulled up to OUT. This prevents corrupted writes during power transitions - a critical safeguard for volatile memory integrity.
Can MAX6368HKA23+ operate with a 1.2V supply voltage?
Yes. MAX6368HKA23+ is specified to operate from VCC = 1.2V to 5.5V. Its internal comparators, reset generator, and transmission gate remain fully functional down to 1.2V, and RESET/RESET outputs are guaranteed valid at this minimum supply. This enables use in ultra-low-power applications such as coin-cell–powered IoT sensors where supply headroom is minimal.
MAX6368HKA23+ 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:
- 2.32V
- 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
MAX6368HKA23+ FAQ
1.How can I place an order for MAX6368HKA23+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368HKA23+ 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 MAX6368HKA23+ reliable?
The price and inventory of MAX6368HKA23+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368HKA23+ is usually 5 days.
3.What payment methods are accepted for MAX6368HKA23+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368HKA23+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368HKA23+?
MAX6368HKA23+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368HKA23+ 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 MAX6368HKA23+?
For technical support, including MAX6368HKA23+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368HKA23+ requirements.
6.How does Aetrix verify that MAX6368HKA23+ is sourced from the original manufacturer or authorized distributors?
All MAX6368HKA23+ 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 MAX6368HKA23+ meets industry standards.
7.What is the process for return or replacement of MAX6368HKA23+?
All MAX6368HKA23+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368HKA23+, 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 MAX6368HKA23+ part is unused and in its original packaging.
Return procedure for MAX6368HKA23+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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