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Analog Devices Inc./Maxim Integrated MAX6368PKA26+T
- Part No.:
- MAX6368PKA26+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SOT-23-8
- Datasheet:
-
MAX6368PKA26+T.pdf
- Description:
- IC SUPERVISOR MPU LP SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,583
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Product details
Overview
The MAX6368PKA26+T from Maxim Integrated is a low-power microprocessor supervisory circuit with auxiliary user-adjustable reset input, battery backup switching, and chip-enable gating. It monitors VCC supply (1.2V–5.5V), asserts active-low open-drain RESET when VCC falls below 2.63V (typ), provides 150ms minimum reset timeout, and supports CMOS RAM write protection via CE IN/CE OUT path with 1.5ns propagation delay. It is used in portable equipment requiring reliable brownout detection and nonvolatile memory retention during main power loss.
For engineers reviewing the MAX6368PKA26+T datasheet, MAX6368PKA26+T pinout, MAX6368PKA26+T application, or MAX6368PKA26+T equivalent, key selection criteria include its 2.63V factory-set reset threshold, 1.235V auxiliary RESET IN comparator, 8-pin SOT23 package, battery-switchover hysteresis (±20mV), and guaranteed RESET operation down to 1.2V supply.
Technical Context
The MAX6368PKA26+T implements a precision voltage-monitoring architecture with dual reset sources: primary VCC monitoring (2.55V–2.70V threshold range) and secondary RESET IN comparator referenced to an internal 1.235V bandgap. Its battery switchover logic enforces two conditions-VCC < VTH and VCC < VBATT − 20mV-before connecting BATT to OUT, preventing oscillation during slow VCC decay.
Chip-enable gating uses a transmission gate with 20Ω–100Ω on-resistance (reset not asserted), delivering 1.5ns typical propagation delay and holding CE OUT low for 12µs after CE IN goes low during reset assertion. The device draws only 10µA quiescent current at VCC = 5.5V and 3µA in battery-backup mode (VBATT = 2.8V, VCC = 0V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold (VTH) | 2.55V (min) to 2.70V (max); factory-trimmed for ±1.5% accuracy at 2.63V typ - ensures precise brownout detection for +2.5V/+3.0V systems |
| RESET Output Type | Open-drain active-low - allows wired-OR configuration and level-shifting across voltage domains |
| RESET Timeout Period (tRP) | 150ms (min) to 280ms (max); guarantees sufficient µP initialization time after power recovery |
| RESET IN Threshold (VRTH) | 1.185V–1.285V; referenced to internal 1.235V bandgap - enables external resistor-divider programming of secondary supply reset points |
| Quiescent Supply Current (ICC) | 15µA (typ) at VCC = 5.5V; 10µA (max) - minimizes system standby power in battery-powered applications |
| Battery-Backup Current (IBACK) | 3µA (max) at TA = −40°C to +85°C; 1µA (typ) at VBATT = 2.8V, VCC = 0V - preserves battery life for multi-year data retention |
| VCC-to-OUT On-Resistance | 4.6Ω (max) at VCC = 2.38V, IOUT = 25mA - supports up to 150mA load from main supply without excessive dropout |
Pinout & Package
MAX6368PKA26+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-low open-drain reset output | Asserts low continuously during VCC undervoltage, RESET IN low, or after reset timeout; requires external pull-up for logic-level compatibility |
| 2 CE IN | Chip-enable input | Directly gates CE signal to SRAM; low during normal operation passes transitions; ignored during reset assertion |
| 3 GND | Ground reference | Common return path for VCC, BATT, and all internal circuitry; must be low-impedance for noise immunity |
| 4 RESET IN | Auxiliary reset input | Compares against 1.235V internal reference; falling edge below 1.235V triggers reset; leakage ±25nA enables high-R divider networks |
| 5 VCC | Main supply input | Operates from 1.2V to 5.5V; powers internal circuitry and supplies OUT during normal operation |
| 6 OUT | Power output | Sources from VCC when active; switches to BATT during brownout; delivers up to 150mA (VCC) or 20mA (BATT) |
| 7 BATT | Backup battery input | Accepts 0V–6V; activates switchover when VCC < VBATT − 20mV; 40mV hysteresis prevents chatter |
| 8 CE OUT | Chip-enable output | Drives SRAM CE pin; low when CE IN is low and reset inactive; held low 12µs after CE IN goes low during reset |
Key Features
| Feature | Design Value |
|---|---|
| Factory-set 2.63V reset threshold | Enables drop-in replacement for +2.5V logic rails without external resistor calibration |
| 1.235V internal reference for RESET IN | Allows accurate programmable monitoring of secondary supplies (e.g., 4.60V via R1/R2 divider) with <0.1% error contribution |
| 1.5ns CE IN-to-CE OUT propagation delay | Supports high-speed µP and DSP interfaces without timing violation in >50MHz address/data buses |
| 150ms minimum reset timeout | Meets JEDEC JESD8-12B requirements for full µP core and peripheral initialization before code execution |
| 3µA max battery-backup supply current | Extends CR2032 battery life beyond 10 years in always-on SRAM retention applications |
Applications
| Portable Medical Data Logger | Industrial PLC Memory Backup |
|---|---|
Use Scenario: Battery-powered ECG logger retains waveform data in SRAM during AC power interruption or low-battery shutdown. IC Role / Device Role / Timing Role: MAX6368PKA26+T monitors main 3.3V rail and asserts RESET while enabling CE gating to freeze SRAM writes; switches OUT to coin-cell backup when VCC drops below 2.63V. Use Value: Prevents data corruption during brownout by disabling writes before supply collapse and maintaining SRAM voltage above 2.0V for >10 years. | Use Scenario: Programmable logic controller maintains real-time clock and configuration registers during factory line power dips. IC Role / Device Role / Timing Role: MAX6368PKA26+T acts as dual-supply supervisor: primary VCC monitor (2.63V) and secondary 5.0V analog supply monitor via RESET IN pin configured for 4.60V trip point. Use Value: Eliminates need for separate voltage detectors, reducing BOM count and PCB area while ensuring deterministic reset sequencing across two critical rails. |
| Point-of-Sale Terminal | Set-Top Box Firmware Protection |
Use Scenario: Retail terminal uses SRAM for transaction buffering; must survive brief grid sags without corrupting pending sales records. IC Role / Device Role / Timing Role: MAX6368PKA26+T provides VCC supervision and automatic battery switchover to maintain SRAM power; CE gating blocks write cycles during reset assertion. Use Value: Guarantees atomic write completion before power loss - no partial transactions written to memory during brownout events. | Use Scenario: Consumer STB stores bootloader and channel map in SRAM; firmware integrity must be preserved during power cycling or surges. IC Role / Device Role / Timing Role: MAX6368PKA26+T monitors 3.3V SoC supply and asserts RESET within 20µs of VCC falling below 2.63V; CE OUT disables SRAM writes during boot sequence. Use Value: Reduces risk of corrupted firmware images by enforcing strict write-protection window aligned with µP reset state machine. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6367PKA26+T | Replaces RESET IN with BATT ON push-pull output; same VTH, tRP, and package | Used where battery-backup status indication is required instead of secondary supply monitoring | Select when visual/LED feedback or external pass-transistor control is needed instead of programmable reset input |
| TPS3808G33DBVR | Fixed 3.08V reset threshold; no battery switchover or CE gating; 350ms timeout; SOT23-6 package | Limited to single-rail supervision without memory backup or write protection functions | Choose only for basic reset generation where battery backup and SRAM write protection are unnecessary |
Compared with MAX6367PKA26+T and TPS3808G33DBVR, the MAX6368PKA26+T uniquely combines adjustable secondary reset input, integrated battery switchover, and chip-enable gating in one 8-pin SOT23 - eliminating three discrete components in portable and industrial memory-retention designs.
Availability
MAX6368PKA26+T is available at Aetrix Electronics and suitable for portable medical devices, industrial PLCs, point-of-sale terminals, and set-top boxes requiring stable component supply, long-term memory retention, and robust brownout immunity.
Supply support for MAX6368PKA26+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, mixed-signal, and power-management ICs for industrial, automotive, communications, and computing markets.
The MAX6365–MAX6368 family was engineered specifically for microprocessor systems needing integrated power supervision, battery-backed memory retention, and hardware-enforced write protection - targeting space-constrained, low-power, and mission-critical applications.
FAQ
What is the exact reset threshold voltage of the MAX6368PKA26+T?
The MAX6368PKA26+T has a factory-trimmed reset threshold (VTH) of 2.55V (minimum), 2.63V (typical), and 2.70V (maximum) over temperature. This 2.63V nominal value targets +2.5V logic rails and is specified with ±1.5% accuracy at +25°C, ensuring reliable brownout detection without external calibration. The MAX6368PKA26+T datasheet confirms this range in the Reset Threshold table under Ordering Information.
How does the RESET IN pin function on the MAX6368PKA26+T?
The RESET IN pin on the MAX6368PKA26+T compares an external voltage against an internal 1.235V bandgap reference. When the voltage at RESET IN falls below 1.235V (1.185V min, 1.285V max), it triggers a reset assertion independent of VCC. Its ±25nA leakage enables high-impedance resistor-divider networks for programmable secondary supply monitoring - for example, setting a 4.60V trip point using R1 = 273kΩ and R2 = 100kΩ. The MAX6368PKA26+T uses this feature to add fault detection beyond primary VCC supervision.
Does the MAX6368PKA26+T support battery backup for SRAM, and how does switchover work?
Yes, the MAX6368PKA26+T supports automatic battery backup for SRAM via its BATT and OUT pins. Switchover occurs only when both conditions are met: VCC falls below the 2.63V reset threshold AND VCC is at least 20mV lower than VBATT. A 40mV hysteresis prevents oscillation during slow VCC decay. In backup mode, OUT connects to BATT, supplying up to 20mA with <1µA quiescent draw from the battery. The MAX6368PKA26+T maintains this state until VCC rises 20mV above VBATT, ensuring clean, chatter-free transitions.
What is the purpose of the CE IN and CE OUT pins on the MAX6368PKA26+T?
The CE IN and CE OUT pins on the MAX6368PKA26+T provide hardware-enforced chip-enable gating to prevent erroneous SRAM writes during power faults. During normal operation, CE IN passes directly to CE OUT through a low-on-resistance transmission gate (20Ω–100Ω). When reset asserts, CE OUT is immediately disabled - if CE IN is low, CE OUT stays low for 12µs to complete ongoing read/write cycles; if CE IN is high, CE OUT remains high. This 1.5ns propagation delay ensures compatibility with fast µPs. The MAX6368PKA26+T uses this to guarantee data integrity without software intervention.
Is the MAX6368PKA26+T pin-compatible with other members of the MAX6365–MAX6368 family?
Yes, the MAX6368PKA26+T shares identical 8-pin SOT23 pinout and footprint with all MAX6365–MAX6368 variants, including MAX6365PKA26+T (manual reset), MAX6366PKA26+T (watchdog), and MAX6367PKA26+T (BATT ON output). All share identical VCC, GND, BATT, OUT, CE IN, CE OUT, and RESET pin assignments. Function-specific pins (MR, WDI, BATT ON, RESET IN) occupy the same location (pin 4) across the family, enabling board-level design reuse. The MAX6368PKA26+T differs only in internal functionality - not physical layout.
MAX6368PKA26+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- 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
MAX6368PKA26+T FAQ
1.How can I place an order for MAX6368PKA26+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX6368PKA26+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 MAX6368PKA26+T reliable?
The price and inventory of MAX6368PKA26+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX6368PKA26+T is usually 5 days.
3.What payment methods are accepted for MAX6368PKA26+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX6368PKA26+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX6368PKA26+T?
MAX6368PKA26+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX6368PKA26+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 MAX6368PKA26+T?
For technical support, including MAX6368PKA26+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX6368PKA26+T requirements.
6.How does Aetrix verify that MAX6368PKA26+T is sourced from the original manufacturer or authorized distributors?
All MAX6368PKA26+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 MAX6368PKA26+T meets industry standards.
7.What is the process for return or replacement of MAX6368PKA26+T?
All MAX6368PKA26+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX6368PKA26+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 MAX6368PKA26+T part is unused and in its original packaging.
Return procedure for MAX6368PKA26+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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