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Analog Devices Inc./Maxim Integrated MAX6368LKA29-T
- Part No.:
- MAX6368LKA29-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368LKA29-T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,502
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Product details
Overview
The MAX6368LKA29-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 supply (1.2V–5.5V), asserts active-low open-drain RESET when VCC falls below 2.93V (typ), provides 150ms minimum reset timeout, consumes only 10µA quiescent current, and operates in -40°C to +85°C for portable equipment and industrial controllers.
For engineers reviewing the MAX6368LKA29-T datasheet, MAX6368LKA29-T pinout, MAX6368LKA29-T application, or MAX6368LKA29-T equivalent, this page delivers verified functional identity, confirmed SOT23-8 package mapping, validated RESET IN threshold (1.235V), battery-switchover behavior (VSW = ±20mV), and real-world CE gating propagation delay (2–9ns).
Technical Context
The MAX6368LKA29-T integrates a precision voltage comparator for VCC monitoring (2.85V–3.00V reset threshold), an independent 1.235V reference for external RESET IN signal conditioning, and a bidirectional transmission gate for CE IN/CE OUT path control. Its internal MOSFET enables seamless VCC-to-BATT switchover with 40mV hysteresis and <1µA battery standby current.
RESET assertion is triggered by VCC undervoltage, falling RESET IN below 1.235V, or manual intervention via MR (not implemented in MAX6368 variant). The device guarantees RESET/RESET validity down to 1.2V and supports chip-enable gating with 1.5ns propagation delay and 20–100Ω on-resistance during normal operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.85V (min) to 3.00V (max); factory-set for +3.3V system monitoring with ±7mV accuracy over temperature |
| RESET IN Threshold | 1.185V–1.285V; enables precise secondary supply monitoring (e.g., 4.6V rail via resistor divider) |
| Quiescent Supply Current | 10µA (typ) at VCC = 5.5V; ensures ultra-low power consumption in battery-backed SRAM retention |
| Reset Timeout Period | 150ms (min); guarantees sufficient µP initialization time after power recovery |
| Battery-Switchover Threshold | VCC − VBATT = ±20mV; prevents oscillation during slow VCC decay with 40mV hysteresis |
| CE IN to CE OUT Delay | 2ns (min) to 9ns (max); supports high-speed µP/DSP interfaces without timing violation |
| Operating Temperature | -40°C to +85°C; qualified for industrial and extended commercial environments |
Pinout & Package
MAX6368LKA29-T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), surface-mount compatible with standard reflow profiles and RoHS-compliant lead-free finish (marked "AACM" per Device Marking Codes table).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Active-low open-drain reset output | Asserts low during VCC undervoltage, RESET IN fault, or brownout; requires external pull-up for µP reset line |
| 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 for VCC, BATT, and logic signals; 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 assertion |
| 5 VCC | Main supply input | Accepts 1.2V–5.5V; powers internal circuitry and sources OUT up to 150mA during normal operation |
| 6 OUT | Power output | Switches between VCC and BATT based on voltage comparison; supplies backup power to SRAM |
| 7 BATT | Backup battery input | Accepts 0V–6V; activates switchover when VBATT > VCC + 20mV and maintains <1µA standby draw |
| 8 CE OUT | Chip-enable output | Passes CE transitions during normal operation; clamped 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 with R1/R2 divider) |
| Battery-backup switchover | Automatic VCC/BATT switching with 40mV hysteresis prevents chatter during slow power decay |
| Chip-enable gating | 1.5ns propagation delay and 20–100Ω on-resistance ensure compatibility with fast µPs and DSPs |
| Low quiescent current | 10µA typical ICC allows multi-year battery life in backup mode for CMOS RAM retention |
| Reset timeout guarantee | 150ms minimum tRP ensures reliable µP initialization across full temperature range (-40°C to +85°C) |
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: Supervisory IC maintains SRAM integrity via BATT switchover and blocks erroneous writes using CE gating. Use Value: Prevents data corruption during 200ms brownout events with guaranteed 150ms reset hold time and <1µA battery drain. |
Use Scenario: Factory-floor PLC sustains I/O state and program counter during 100ms utility dip. IC Role / Device Role / Timing Role: MAX6368LKA29-T monitors 3.3V logic rail and triggers reset before µP executes invalid instructions. Use Value: 2.93V reset threshold aligns with 3.3V ±5% tolerance; 1.235V RESET IN detects auxiliary 5V supply failure. |
| Point-of-Sale Terminal | Set-Top Box Firmware Recovery |
Use Scenario: Retail terminal preserves transaction logs during unexpected power interruption. IC Role / Device Role / Timing Role: Controls VCC-to-BATT transition for SRAM and disables CE during reset to lock memory state. Use Value: 10µA quiescent current extends coin-cell life to >3 years; 150ms tRP satisfies ARM Cortex-M boot requirements. |
Use Scenario: Consumer STB recovers from corrupted firmware after power glitch. IC Role / Device Role / Timing Role: Generates clean reset pulse and gates CE to prevent flash write during unstable VCC. Use Value: 2.93V threshold rejects 100ns transients per Maxims transient immunity spec; CE gating eliminates partial-write risk. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6368PKA29-T | Same reset threshold (2.85V–3.00V), but push-pull RESET output instead of open-drain | Eliminates need for external pull-up resistor; unsuitable where wired-OR reset bus is required | Select MAX6368PKA29-T if driving single µP reset pin without bus sharing |
| MAX6368HKA29-T | Identical functionality and pinout, but active-high open-drain RESET output | Requires inverted logic interface; used where host µP accepts active-high reset assertion | Choose MAX6368HKA29-T only when system architecture mandates active-high reset signaling |
Compared with MAX6368LKA29-T, MAX6368PKA29-T simplifies board layout by removing the pull-up resistor, while MAX6368HKA29-T supports legacy µPs requiring active-high reset - neither offers pin-to-pin compatibility due to differing RESET polarity and drive structure.
Availability
MAX6368LKA29-T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC controllers, point-of-sale terminals, and set-top box firmware recovery systems requiring stable component supply and long-term lifecycle support.
Supply support for MAX6368LKA29-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 interface applications in industrial, automotive, and computing markets.
The MAX6365–MAX6368 family delivers integrated power-supply supervision, battery backup, and memory protection for space-constrained µP systems - specifically engineered to replace discrete reset generators and external gating logic.
FAQ
What is the exact reset threshold voltage of the MAX6368LKA29-T?
The MAX6368LKA29-T has a factory-trimmed reset threshold of 2.85V (minimum), 2.93V (typical), and 3.00V (maximum) at TA = +25°C, with guaranteed operation across -40°C to +85°C. This threshold is optimized for monitoring +3.3V power rails with ±5% tolerance and is specified in the Reset Threshold Ranges table of the datasheet. The MAX6368LKA29-T uses the "29" suffix code to denote this specific voltage grade.
Does the MAX6368LKA29-T support battery-backup operation, and what are the switchover conditions?
Yes, the MAX6368LKA29-T supports automatic battery-backup operation. Switchover occurs when two conditions are met: VCC falls below the 2.93V reset threshold AND VCC drops at least 20mV below VBATT. The device then connects BATT to OUT to sustain SRAM power, drawing less than 1µA from the battery in backup mode. When VCC rises 20mV above VBATT, it switches back to VCC sourcing. This 40mV hysteresis prevents oscillation during slow VCC decay.
What is the function of the RESET IN pin on the MAX6368LKA29-T, and how is it used?
The RESET IN pin on the MAX6368LKA29-T is an auxiliary reset input that compares an external voltage to an internal 1.235V reference. When the voltage at RESET IN falls below 1.235V (1.185V min, 1.285V max), the device asserts RESET. It is commonly used to monitor secondary power supplies (e.g., 5V or 2.5V rails) via a resistor divider. For example, to detect a failing 4.6V supply, R1 = 273kΩ and R2 = 100kΩ yield VRTH ≈ 4.60V, as documented in the Typical Operating Circuit.
What type of RESET output does the MAX6368LKA29-T provide, and how should it be interfaced?
The MAX6368LKA29-T provides an active-low open-drain RESET output (pin 1). It must be pulled up externally-typically to VCC or another logic rail-with a resistor (e.g., 10kΩ) to generate a valid logic-high level when deasserted. This configuration supports wired-OR reset buses and allows multiple devices to share a common reset line. The output sinks up to 1.6mA when asserted and remains valid down to 1.2V VCC or VBATT, ensuring robust operation during brownout conditions.
How does the chip-enable (CE) gating function work in the MAX6368LKA29-T?
The MAX6368LKA29-T implements CE gating using a low-on-resistance transmission gate between CE IN (pin 2) and CE OUT (pin 8). During normal operation, CE IN passes directly to CE OUT with 1.5ns propagation delay. When RESET asserts, CE OUT is forced low for 12µs to complete any ongoing memory access, then actively pulled up to OUT. This prevents partial writes to SRAM during power faults. The CE path remains disabled until RESET deasserts and CE IN returns high, ensuring data integrity.
MAX6368LKA29-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.93V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 150ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-8
MAX6368LKA29-T FAQ
1.How can I place an order for MAX6368LKA29-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368LKA29-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 MAX6368LKA29-T reliable?
The price and inventory of MAX6368LKA29-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368LKA29-T is usually 5 days.
3.What payment methods are accepted for MAX6368LKA29-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368LKA29-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368LKA29-T?
MAX6368LKA29-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368LKA29-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 MAX6368LKA29-T?
For technical support, including MAX6368LKA29-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368LKA29-T requirements.
6.How does Aetrix verify that MAX6368LKA29-T is sourced from the original manufacturer or authorized distributors?
All MAX6368LKA29-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 MAX6368LKA29-T meets industry standards.
7.What is the process for return or replacement of MAX6368LKA29-T?
All MAX6368LKA29-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368LKA29-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 MAX6368LKA29-T part is unused and in its original packaging.
Return procedure for MAX6368LKA29-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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