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Analog Devices Inc./Maxim Integrated MAX6368PKA46+T
- Part No.:
- MAX6368PKA46+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368PKA46+T.pdf
- Description:
- IC SUPERVISOR MPU LP SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:2,846
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Product details
Overview
The MAX6368PKA46+T from Maxim Integrated is a low-power microprocessor supervisory circuit with battery-backup switching, chip-enable gating, and auxiliary user-adjustable reset input. It operates from 1.2V to 5.5V, features a factory-preset 4.63V reset threshold (±0.13V), 150ms minimum reset timeout, 10µA quiescent current, and an open-drain active-low RESET output - designed for reliable power monitoring and data retention in SRAM-based embedded systems during brownout or main supply failure.
For engineers reviewing the MAX6368PKA46+T datasheet, MAX6368PKA46+T pinout, MAX6368PKA46+T application, or MAX6368PKA46+T equivalent, key selection criteria include its 1.235V auxiliary reset comparator threshold, VCC-to-BATT switchover hysteresis (±20mV), CE IN–to–CE OUT propagation delay (≤9ns), battery-backup mode supply current (3µA at −40°C to +85°C), and SOT23-8 package compatibility with space-constrained µP systems.
Technical Context
The MAX6368PKA46+T implements a precision voltage-monitoring architecture with dual-threshold supervision: primary VCC monitoring against a 4.63V factory-trimmed threshold and secondary undervoltage detection via the RESET IN pin referenced to an internal 1.235V bandgap. Its battery switchover logic enforces strict sequencing - requiring both VCC < VTH and VCC < VBATT − 20mV before engaging backup power.
Chip-enable gating uses a series transmission gate with 20Ω–100Ω on-resistance (reset not asserted) and 12µs reset-to-CE OUT hold time when CE IN is low during reset assertion. The RESET output is open-drain active-low, guaranteed functional down to 1.2V VCC or VBATT, with 0.3V VOL at 1.6mA sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63V ±0.13V - ensures reliable reset assertion for +5V systems with 5% tolerance margin |
| RESET IN Threshold | 1.235V ±0.05V - enables precise secondary supply monitoring (e.g., 4.6V via resistor divider) |
| Quiescent Current | 10µA max at VCC = 5.5V - minimizes standby power in battery-backed applications |
| Reset Timeout Period | 150ms min - guarantees sufficient µP initialization time after VCC recovery |
| VCC-to-BATT Switchover Hysteresis | ±20mV - prevents oscillation during slow VCC decay near VBATT |
| CE IN–to–CE OUT Delay | 2ns to 9ns - supports high-speed µP/DSP interfaces without timing violation |
| Operating Voltage Range | 1.2V to 5.5V - allows direct interface with 1.2V, 1.8V, 2.5V, 3.3V, and 5V logic domains |
Pinout & Package
MAX6368PKA46+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm), optimized for high-density PCB layouts in portable and industrial control systems.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RESET | Open-drain active-low reset output | Asserts low during VCC undervoltage, RESET IN fault, or watchdog timeout; requires external pull-up for logic-level compatibility |
| 2 CE IN | Chip-enable input | Controls gating of CE signal to SRAM; low disables write access during power faults |
| 3 GND | Ground reference | Common return path for VCC, BATT, and signal circuits; must be low-impedance for noise immunity |
| 4 RESET IN | Auxiliary reset comparator input | Triggers reset when voltage falls below 1.235V; used for secondary supply monitoring or system-level fault signaling |
| 5 VCC | Main supply input | Powers device and supplies OUT during normal operation; monitored for 4.63V reset threshold |
| 6 OUT | Power output | Sources from VCC normally; switches to BATT during backup mode; supports up to 150mA load |
| 7 BATT | Backup battery input | Provides backup power to OUT when VCC fails; requires ≥20mV above VCC to engage |
| 8 CE OUT | Chip-enable output | Passes CE IN signal during normal operation; held low for 12µs after reset assertion if CE IN is low |
Key Features
| Feature | Design Value |
|---|---|
| Factory-trimmed 4.63V reset threshold | Eliminates external resistor network for +5V systems, reducing BOM count and layout area |
| 1.235V internal reference for RESET IN | Enables accurate secondary supply monitoring (e.g., 4.6V with 100kΩ/273kΩ divider) without external reference IC |
| 150ms min reset timeout | Guarantees full µP reset sequence completion even under worst-case VCC ramp conditions |
| VCC-to-BATT switchover hysteresis | Prevents chattering during slow brownout transitions, ensuring stable RAM power during marginal VCC |
| 10µA quiescent current | Extends battery life in always-on backup applications - e.g., >10 years on a 200mAh coin cell |
| CE IN–to–CE OUT propagation delay ≤9ns | Preserves timing integrity with modern µPs and DSPs operating at >50MHz clock rates |
Applications
| SRAM Data Retention System | Industrial PLC Power Monitoring |
|---|---|
Use Scenario: Maintaining volatile CMOS SRAM contents during AC mains interruption in programmable logic controllers. IC Role / Device Role / Timing Role: Supervisory controller that monitors VCC, switches SRAM power to backup battery, gates CE to prevent write corruption, and asserts RESET to halt µP execution until stable power returns. Use Value: Prevents loss of configuration, runtime variables, and process state during 100ms–500ms utility outages using a single 3V lithium coin cell. | Use Scenario: Detecting undervoltage on 24VDC fieldbus power rails feeding I/O modules in factory automation cabinets. IC Role / Device Role / Timing Role: Secondary supervisor using RESET IN to monitor regulated 5V auxiliary rail derived from 24VDC; triggers system-wide reset if 5V drops below 4.6V. Use Value: Adds fail-safe redundancy beyond primary VCC monitoring, catching regulator degradation before it causes I/O misreads or communication errors. |
| POS Terminal Battery Backup | Medical Infusion Pump Safety Monitor |
Use Scenario: Preserving transaction logs and calibration data in point-of-sale terminals during brief battery swaps or AC dropout. IC Role / Device Role / Timing Role: Provides seamless VCC-to-BATT switchover for SRAM, blocks memory writes via CE gating during power transition, and holds µP in reset until backup power stabilizes. Use Value: Ensures PCI-DSS compliance by guaranteeing non-volatile storage of encrypted payment records without external EEPROM or flash wear leveling. | Use Scenario: Monitoring dual independent power supplies (main + isolated backup) in Class II medical devices to enforce safe shutdown on dual-failure detection. IC Role / Device Role / Timing Role: Uses primary VCC monitoring (4.63V) and RESET IN (1.235V reference) to supervise both supplies - asserting RESET only when both fall below safe thresholds. Use Value: Meets IEC 62304 SOUP requirements for hardware-level fault detection, eliminating need for software-based voltage polling and associated latency risks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6368HKA46+T | Same functionality and pinout; differs only in reset output type - push-pull active-high vs. open-drain active-low | Requires redesign of RESET pull-up network and µP reset input logic polarity handling | Select when µP requires active-high reset with no external pull-up or when driving multiple loads simultaneously |
| TPS3808G33DBVR | 3.3V fixed reset threshold; no RESET IN pin; 350ms reset timeout; 2.9µA quiescent current; SOT23-6 package | Lacks battery switchover, CE gating, and auxiliary reset input - suitable only for basic VCC monitoring | Choose for cost-sensitive, space-constrained designs where backup power and memory protection are unnecessary |
Compared with MAX6368HKA46+T and TPS3808G33DBVR, the MAX6368PKA46+T uniquely combines 4.63V precision supervision, battery-backed SRAM support, chip-enable write protection, and user-adjustable secondary reset - making it irreplaceable in systems requiring guaranteed data integrity during extended power loss.
Availability
MAX6368PKA46+T is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, POS terminals, and SRAM-based data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX6368PKA46+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing markets.
The MAX6365–MAX6368 family was engineered to replace discrete reset generators, battery switchover MOSFETs, and CE gating logic in µP systems - delivering integrated power supervision, data retention, and fault containment in ultra-small SOT23 packages.
FAQ
What is the exact reset threshold voltage for MAX6368PKA46+T?
The MAX6368PKA46+T has a factory-trimmed reset threshold of 4.63V, with a guaranteed range of 4.50V to 4.75V across −40°C to +85°C. This value is laser-trimmed during production and applies specifically to the VCC supply monitoring function. The MAX6368PKA46+T also includes a separate 1.235V ±0.05V internal reference for the RESET IN pin, enabling precise secondary supply monitoring.
How does the battery switchover logic work in MAX6368PKA46+T?
The MAX6368PKA46+T engages battery backup only when two conditions are met simultaneously: VCC must fall below the 4.63V reset threshold, and VCC must be at least 20mV lower than VBATT. This ±20mV hysteresis prevents oscillation during slow VCC decay. Once engaged, OUT is sourced from BATT, and CE OUT is gated to prevent SRAM writes. The MAX6368PKA46+T draws just 3µA from the battery in this mode, extending backup runtime significantly.
Can MAX6368PKA46+T monitor a secondary power rail using RESET IN?
Yes - the MAX6368PKA46+T includes a dedicated RESET IN pin referenced to an internal 1.235V bandgap. By connecting a resistor divider from the secondary rail (e.g., 5V or 3.3V) to RESET IN, users can program custom undervoltage thresholds. For example, a 100kΩ/273kΩ divider sets a 4.60V trip point. Input leakage is ±25nA, allowing use of high-value resistors without accuracy loss - a capability not found in most competing supervisors.
What is the purpose of CE IN and CE OUT in MAX6368PKA46+T?
CE IN and CE OUT implement hardware-level chip-enable gating to prevent SRAM write corruption during power faults. When reset is asserted, CE OUT is forced low (if CE IN was low) or held high (if CE IN was high), blocking all write cycles. The 12µs hold time ensures ongoing read/write operations complete before gating activates. With ≤9ns propagation delay and 20Ω–100Ω on-resistance, the MAX6368PKA46+T maintains timing integrity with high-speed µPs - unlike software-based solutions vulnerable to interrupt latency.
Is MAX6368PKA46+T compatible with 1.2V logic systems?
Yes - the MAX6368PKA46+T operates from 1.2V to 5.5V and guarantees RESET output functionality down to 1.2V on either VCC or VBATT. Its 10µA quiescent current and 3µA battery-backup current enable direct integration into ultra-low-power 1.2V microcontroller systems. The device's internal bandgap reference and comparator circuitry remain stable across this full range, ensuring consistent 4.63V threshold accuracy regardless of supply voltage.
MAX6368PKA46+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:
- 4.63V
- Output:
- Open Drain or Open Collector
- 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
MAX6368PKA46+T FAQ
1.How can I place an order for MAX6368PKA46+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368PKA46+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 MAX6368PKA46+T reliable?
The price and inventory of MAX6368PKA46+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368PKA46+T is usually 5 days.
3.What payment methods are accepted for MAX6368PKA46+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368PKA46+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368PKA46+T?
MAX6368PKA46+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368PKA46+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 MAX6368PKA46+T?
For technical support, including MAX6368PKA46+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368PKA46+T requirements.
6.How does Aetrix verify that MAX6368PKA46+T is sourced from the original manufacturer or authorized distributors?
All MAX6368PKA46+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 MAX6368PKA46+T meets industry standards.
7.What is the process for return or replacement of MAX6368PKA46+T?
All MAX6368PKA46+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368PKA46+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 MAX6368PKA46+T part is unused and in its original packaging.
Return procedure for MAX6368PKA46+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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