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Analog Devices Inc./Maxim Integrated MAX6368HKA29+T
- Part No.:
- MAX6368HKA29+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368HKA29+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,500
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Product details
Overview
MAX6368HKA29+T 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 2.93V (typ), provides 1.235V internal reference for RESET IN, delivers ≤10µA quiescent current, and operates in -40°C to +85°C for portable equipment power management.
For engineers reviewing the MAX6368HKA29+T datasheet, MAX6368HKA29+T pinout, MAX6368HKA29+T application, or MAX6368HKA29+T equivalent, key selection criteria include its 2.93V factory-set VTH, 1.235V RESET IN threshold, 150ms min reset timeout, SOT23-8 package, and support for secondary supply monitoring via external resistor divider.
Technical Context
The MAX6368HKA29+T integrates a precision voltage monitor, a comparator-based RESET IN input referenced to 1.235V, a bidirectional VCC/BATT switchover MOSFET with 40mV hysteresis, and a transmission-gate CE path with 1.5ns propagation delay. Its reset generator guarantees valid RESET assertion down to 1.2V on either VCC or VBATT.
It implements battery-backup mode only when both VCC < VTH and VCC < VBATT − 20mV, and holds CE OUT low for 12µs after CE IN goes low during reset assertion-enabling safe SRAM write termination without external timing logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VTH) | 2.85V to 3.00V (min/typ/max); factory-trimmed for +3.0V systems with ±2.5% accuracy over temperature |
| RESET IN Threshold (VRTH) | 1.185V to 1.285V (min/typ/max); enables precise undervoltage detection of secondary supplies via external resistor divider |
| Quiescent Supply Current | 15µA max at VCC = 5.5V; ensures minimal battery drain in always-on backup operation |
| Reset Timeout Period (tRP) | 150ms min; guarantees µP initialization completes before release from reset |
| VCC-to-OUT On-Resistance | 4.6Ω max at VCC = 2.38V, IOUT = 25mA; supports up to 150mA load from main supply |
| Battery-Backup Supply Current | 3µA max at VBATT = 2.8V, VCC = 0V; extends coin-cell life in long-term memory retention |
| CE IN to CE OUT Propagation Delay | 2ns to 9ns (typ); compatible with high-speed µP address/data buses without timing violation |
Pinout & Package
MAX6368HKA29+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), surface-mount, lead(Pb)-free, RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-high open-drain reset output | Asserts high during VCC brownout, RESET IN low, or manual trigger; requires external pull-down for active-low logic interface |
| 2: CE IN | Chip-enable input | Directly gates CE signal to SRAM; low disables write access during power fault |
| 3: GND | Ground reference | Common return for all analog and digital functions; must be low-impedance connection |
| 4: RESET IN | Auxiliary reset comparator input | Compares against 1.235V internal reference; falling edge below threshold triggers reset assertion |
| 5: VCC | Main supply input | Operates from 1.2V to 5.5V; powers internal circuitry and sources OUT during normal operation |
| 6: OUT | Regulated output | Switches between VCC and BATT based on voltage comparison; supplies SRAM or real-time clock |
| 7: BATT | Backup battery input | Accepts 2.0V–5.5V; connects to OUT only when VCC < VTH and VCC < VBATT − 20mV |
| 8: CE OUT | Chip-enable output | Passes CE IN when reset inactive; held low for 12µs after CE IN goes low during reset to complete pending writes |
Key Features
| Feature | Design Value |
|---|---|
| User-adjustable RESET IN | Internal 1.235V reference enables programmable undervoltage detection of secondary supplies (e.g., 5V, 3.3V) using two external resistors |
| Chip-enable gating with 1.5ns delay | Prevents SRAM corruption during brownout by disabling CE path within 1.5ns of reset assertion |
| Battery switchover with 40mV hysteresis | Eliminates oscillation during slow VCC decay by requiring 20mV rise above VBATT to revert from battery mode |
| Guaranteed RESET validity to 1.2V | Ensures reliable reset signaling even as VCC drops to minimum operating voltage-critical for Li-ion or supercapacitor backup |
| 150ms min reset timeout | Meets µP power-on reset timing requirements across industrial temperature range without external RC network |
Applications
| Portable Medical Monitor | Industrial PLC Data Logger |
|---|---|
Use Scenario: Battery-powered ECG recorder retains real-time waveform data during AC power loss. IC Role / Device Role / Timing Role: Supervises main 3.3V rail and secondary 5V analog supply; switches SRAM to coin-cell backup; gates CE to prevent partial write corruption. Use Value: Enables >10-year data retention on CR2032 via 3µA backup current and eliminates need for external reset timer or level-shifter. |
Use Scenario: Factory-floor data logger captures sensor readings during unexpected mains dropout. IC Role / Device Role / Timing Role: Monitors 24V-derived 5V system rail and 3.3V I/O rail; asserts reset on primary failure while preserving RAM contents via BATT switchover. Use Value: Guarantees deterministic µP restart and zero-data-loss SRAM hold using integrated 150ms timeout and 1.5ns CE gating. |
| Smart Energy Meter | Point-of-Sale Terminal |
Use Scenario: Utility meter maintains time-of-use billing registers during grid voltage sags. IC Role / Device Role / Timing Role: Uses RESET IN to monitor isolated 3.3V RTC supply; triggers reset if RTC rail dips below 3.1V, preventing timestamp drift. Use Value: Achieves ±2ppm RTC accuracy by detecting secondary supply faults before timekeeping degradation occurs. |
Use Scenario: Retail terminal preserves transaction buffer during brief UPS switchover. IC Role / Device Role / Timing Role: Provides dual-rail supervision (5V logic, 3.3V processor) and coordinates CE gating to lock flash memory writes during power transition. Use Value: Eliminates firmware rollback risk by ensuring atomic write completion via 12µs CE OUT hold time during reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6368HKA31+T | Higher reset threshold (3.00V–3.15V typ); same RESET IN, CE gating, and package | Better suited for +3.3V systems where tighter VTH margin prevents nuisance resets during ripple | Select when main supply nominal is 3.3V and tolerance stack-up requires ≥3.0V trip point |
| TPS3808G33DBVR | Fixed 3.08V reset threshold; no RESET IN input; push-pull RESET output; 1.8V–6.0V VCC range | Lacks secondary supply monitoring capability but offers lower 2.5µA quiescent current and automotive temp grade | Choose for cost-sensitive, single-rail designs where auxiliary reset input is unnecessary |
Compared with MAX6368HKA29+T, MAX6368HKA31+T provides higher VTH headroom for noisy 3.3V rails, while TPS3808G33DBVR trades RESET IN flexibility for lower IQ and AEC-Q100 qualification-making it suitable for automotive body electronics but not for dual-supply fault detection.
Availability
MAX6368HKA29+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial data loggers, smart energy meters, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6368HKA29+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 power management, sensing, and connectivity in demanding environments.
The MAX6365–MAX6368 family targets space-constrained µP systems needing integrated power supervision, battery switchover, and memory write protection-replacing discrete reset + backup + gating solutions with a single 8-pin SOT23 device.
FAQ
What is the factory-set reset threshold voltage for MAX6368HKA29+T?
The MAX6368HKA29+T has a factory-trimmed reset threshold (VTH) of 2.85V (min), 2.93V (typ), and 3.00V (max) across -40°C to +85°C. This 2.93V typical value is optimized for reliable supervision of +3.0V logic rails with margin against ripple-induced false triggers. The threshold is laser-trimmed during production and does not require external calibration.
How does the RESET IN function work on MAX6368HKA29+T?
The RESET IN pin on MAX6368HKA29+T compares an external voltage against an internal 1.235V reference. When the voltage at RESET IN falls below 1.185V (min), the device asserts RESET. This enables precise monitoring of secondary supplies (e.g., 5V or 3.3V) using a simple resistor divider. The input leakage is ±25nA max, allowing use of high-value resistors without accuracy loss.
What package type and dimensions does MAX6368HKA29+T use?
MAX6368HKA29+T uses an 8-pin SOT23 package measuring 2.9mm × 1.6mm × 1.1mm with standard gull-wing leads. It is lead(Pb)-free, RoHS-compliant, and specified for reflow soldering at +260°C (lead-free). The top mark is AACY, matching the ordering suffix HKA29.
Does MAX6368HKA29+T support battery-backup operation, and what are the switchover conditions?
Yes, MAX6368HKA29+T supports automatic battery-backup operation. Switchover to BATT occurs only when both conditions are met: VCC falls below the 2.93V reset threshold AND VCC is at least 20mV lower than VBATT. A 40mV hysteresis prevents chattering during slow VCC decay. OUT then sources from BATT, maintaining SRAM or RTC power with ≤3µA backup current.
What is the purpose of CE IN and CE OUT on MAX6368HKA29+T?
CE IN and CE OUT implement hardware-enforced memory write protection on MAX6368HKA29+T. During normal operation, CE IN passes directly to CE OUT with 1.5ns propagation delay. When reset asserts, CE OUT is immediately disabled-preventing partial writes to SRAM. If CE IN is low at reset assertion, CE OUT stays low for 12µs to complete the current cycle before disconnecting.
MAX6368HKA29+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- 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
MAX6368HKA29+T FAQ
1.How can I place an order for MAX6368HKA29+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368HKA29+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 MAX6368HKA29+T reliable?
The price and inventory of MAX6368HKA29+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368HKA29+T is usually 5 days.
3.What payment methods are accepted for MAX6368HKA29+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368HKA29+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368HKA29+T?
MAX6368HKA29+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368HKA29+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 MAX6368HKA29+T?
For technical support, including MAX6368HKA29+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368HKA29+T requirements.
6.How does Aetrix verify that MAX6368HKA29+T is sourced from the original manufacturer or authorized distributors?
All MAX6368HKA29+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 MAX6368HKA29+T meets industry standards.
7.What is the process for return or replacement of MAX6368HKA29+T?
All MAX6368HKA29+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368HKA29+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 MAX6368HKA29+T part is unused and in its original packaging.
Return procedure for MAX6368HKA29+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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