My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX802REPA+
- Part No.:
- MAX802REPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX802REPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:533
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX802REPA+ from Maxim Integrated is a 3.0V/3.3V microprocessor supervisory circuit with active-low RESET output, precision 2.625V reset threshold (±2%), 200ms reset timeout, watchdog timer (1.6s), and battery-backup switchover capability. It monitors VCC supply integrity, asserts reset during brownout or watchdog timeout, and switches VOUT to VBATT when VCC falls below 2.40V - used in battery-powered embedded controllers requiring reliable power-fail detection and RAM backup.
For engineers reviewing the MAX802REPA+ datasheet, MAX802REPA+ pinout, MAX802REPA+ application, or MAX802REPA+ equivalent, this page delivers verified specifications, validated pin functions, confirmed operating conditions (–40°C to +85°C), and real-world substitution guidance for industrial and portable µP systems.
Technical Context
The MAX802REPA+ integrates a precision reset comparator with 10mV hysteresis, a non-disableable 1.6s watchdog timer cleared by WDI edges, and a dual-path power switch: VCC-to-VOUT via 3Ω PMOS and VBATT-to-VOUT via 140Ω NMOS. Its reset assertion is guaranteed down to VCC = 1V, and it supports battery voltages exceeding VCC (e.g., 3.6V Li-cell) without external diodes.
It features a dedicated PFI input (1.237V threshold, ±20mV hysteresis) for independent power-fail monitoring, and MR input with internal 70µA pull-up enabling TTL/CMOS-compatible manual reset. All logic outputs are CMOS-compatible, with RESET sinking 1.2mA at 0.3V max VOL.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold Voltage | 2.625V (nominal), ±2% tolerance - ensures reset assertion before VCC drops below 2.59V in 3.0V ±10% systems |
| Reset Timeout Period | 200ms (typical), 140–280ms over temperature - guarantees sufficient µP initialization time after power stabilization |
| VCC Supply Current | 40µA (typical, VCC < 3.6V) - enables ultra-low-power operation in battery-backed standby mode |
| VBATT Supply Current | 0.4–1µA (max) - minimizes battery drain during long-term backup operation |
| Watchdog Timeout | 1.6s (typical), 1.12–2.24s over temperature - provides robust µP activity monitoring without false triggers |
| Battery Switch Threshold | VSW = 2.40V (typical), 65mV hysteresis - initiates switchover before VOUT falls below 2.0V RAM retention limit |
| PFI Input Threshold | 1.237V (typical), ±20mV hysteresis - supports accurate undervoltage detection on auxiliary rails |
Pinout & Package
MAX802REPA+ is housed in an 8-pin plastic DIP (PDIP) package with lead-free finish (+ suffix), RoHS-compliant, 0.300" wide body, and through-hole mounting. Pin spacing is 0.100", compatible with standard 0.1" pitch PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | Supply output for CMOS RAM | Switches between VCC (via 3Ω PMOS) and VBATT (via 140Ω NMOS); must be decoupled with 0.1µF capacitor |
| 2 - VCC | Main system supply input | Accepts 2.72V–5.5V; powers internal circuitry and enables VOUT connection to VCC above reset threshold |
| 3 - GND | Ground reference | Common return for all analog and digital functions; substrate tied to higher of VCC/VBATT |
| 4 - PFI | Power-fail input | Monitors auxiliary rail via external divider; asserts PFO low when voltage falls below 1.237V |
| 5 - PFO | Power-fail open-drain output | Active-low signal indicating PFI undervoltage or VCC < VSW; can drive MR on MAX704/MAX806 |
| 6 - WDI | Watchdog input | Edge-sensitive (rising/falling); resets watchdog timer; cannot be disabled - ties high/low causes 1.8s reset cycle |
| 7 - RESET | Active-low reset output | Open-drain, sinks 1.2mA; asserted low during power-up, brownout, or watchdog timeout; guaranteed to VCC = 1V |
| 8 - VBATT | Backup battery input | Accepts up to 6.0V; connects to VOUT when VCC < VSW; may exceed VCC (e.g., 3.6V Li-cell) |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures deterministic reset behavior even during deep brownout, critical for fail-safe µP recovery |
| ±2% reset threshold tolerance | Tighter than MAX690/MAX704 families - improves margin for 3.0V ±10% supply systems |
| Battery-backup switchover with 2.40V threshold | Prevents premature RAM data loss by switching before VOUT reaches 2.0V retention limit |
| 1.6s watchdog timer with edge-triggered clear | Eliminates software lockup without requiring periodic service pulses - toggling WDI resets timer |
| 40µA VCC supply current (typ) | Extends battery life in always-on backup mode; 25× lower than discrete solutions |
| Independent PFI/PFO monitoring path | Enables concurrent supervision of secondary rails (e.g., analog supply) without affecting reset timing |
Applications
| Battery-Powered Embedded Controller | Industrial Data Logger |
|---|---|
|
Use Scenario: Portable environmental sensor node powered by lithium coin cell, logging temperature/humidity every 10 seconds with SRAM buffer. IC Role / Device Role / Timing Role: Supervises 3.0V main supply, asserts RESET on brownout, switches VOUT to VBATT during power loss, and triggers watchdog if firmware hangs. Use Value: Prevents corrupted log entries and preserves RAM contents for >72 hours on backup power using 3.6V Li-cell. |
Use Scenario: Ruggedized field recorder capturing vibration data in oil/gas pipelines, operating unattended for months. IC Role / Device Role / Timing Role: Monitors primary 3.3V rail and auxiliary 5V sensor supply via PFI divider; generates PFO interrupt on undervoltage. Use Value: Enables early warning of failing power before data loss - PFO drives µP interrupt pin to initiate safe shutdown and flash save. |
| Medical Handheld Diagnostic Device | Smart Meter with Tamper Detection |
|
Use Scenario: Battery-operated glucose meter with EEPROM calibration storage and LCD display. IC Role / Device Role / Timing Role: Provides 200ms power-on reset, detects VCC sag during LCD backlight surge, and backs up SRAM during battery swap. Use Value: Guarantees consistent boot state and prevents calibration corruption - RESET asserted even at VCC = 1.2V. |
Use Scenario: Utility meter with real-time clock, secure memory, and magnetic tamper detection circuitry. IC Role / Device Role / Timing Role: Uses WDI to verify firmware execution; ties MR to tamper switch - physical intrusion forces immediate reset and secure erase. Use Value: Meets IEC 62056-21 security requirements - hardware-enforced reset on tamper event, no software bypass possible. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX802SEPA+ | 2.925V reset threshold (±2%), otherwise identical pinout, timing, and features | Suitable for 3.3V ±10% systems where higher trip point avoids nuisance resets during nominal ripple | Select when system VCC nominal is 3.3V and design requires reset only below 2.85V |
| MAX802TEPA+ | 3.075V reset threshold (±2%), same package and electrical specs | Optimized for 3.3V ±5% supplies - asserts reset earlier to accommodate tighter regulation tolerances | Choose for designs with low-noise LDOs where 3.15V dropout is acceptable guardband |
Compared with MAX802SEPA+ and MAX802TEPA+, the MAX802REPA+ offers the lowest reset threshold in the family (2.625V), making it uniquely suited for 3.0V systems with wide input tolerance or legacy designs requiring deeper brownout immunity - all while retaining identical watchdog, battery switchover, and PFI functionality.
Availability
MAX802REPA+ is available at Aetrix Electronics and suitable for battery-powered computers and controllers, intelligent instruments, and critical µP power monitoring requiring stable component supply across industrial temperature ranges (–40°C to +85°C).
Supply support for MAX802REPA+ 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 demanding industrial, medical, and communications applications.
The MAX802 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for reliable power monitoring and fail-safe reset generation in 3.0V/3.3V embedded systems with battery backup requirements.
FAQ
What is the guaranteed minimum VCC voltage at which MAX802REPA+ asserts RESET?
The MAX802REPA+ guarantees RESET assertion down to VCC = 1.0V, regardless of VBATT status. This is confirmed in the Absolute Maximum Ratings and Electrical Characteristics tables, ensuring fail-safe behavior during deep brownout conditions where other supervisors may release reset prematurely. The guarantee holds with or without battery backup connected.
Does MAX802REPA+ support battery voltages higher than VCC, and what is the maximum allowed?
Yes, MAX802REPA+ explicitly supports VBATT exceeding VCC - such as a 3.6V lithium cell with a 3.3V system rail. The Absolute Maximum Ratings specify VBATT = –0.3V to +6.0V, and the Backup-Battery Switchover section confirms operation with VBATT > VCC. No external blocking diode is required due to internal MOSFET isolation.
Can the watchdog timer in MAX802REPA+ be disabled?
No, the watchdog timer in MAX802REPA+ cannot be disabled. As stated in the Watchdog Input section: "Unlike the 5V MAX690 family, the watchdog function cannot be disabled." It continuously monitors WDI for edges; tying WDI high or low results in automatic 1.8s reset cycles (tWD + tRS), providing inherent lockup protection.
What is the function of the PFI and PFO pins on MAX802REPA+?
PFI is a dedicated analog input (1.237V threshold) for monitoring auxiliary power rails via external resistor dividers. PFO is its open-drain output that goes low when PFI falls below threshold or VCC drops below VSW (2.40V). PFO can drive interrupts or be connected to MR on MAX704/MAX806 to trigger system reset - fully independent of the main reset comparator.
Is MAX802REPA+ pin-compatible with other devices in the MAX802T/S/R family?
Yes, MAX802REPA+ is fully pin-compatible with MAX802TEPA+ and MAX802SEPA+ - all share identical 8-pin PDIP package, pin numbering, and terminal functions. The only difference is the reset threshold voltage (2.625V vs. 3.075V/2.925V), allowing direct substitution in layouts where threshold selection matches system requirements.
MAX802REPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.625V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX802REPA+ FAQ
1.How can I place an order for MAX802REPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX802REPA+ 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 MAX802REPA+ reliable?
The price and inventory of MAX802REPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX802REPA+ is usually 5 days.
3.What payment methods are accepted for MAX802REPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX802REPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX802REPA+?
MAX802REPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX802REPA+ 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 MAX802REPA+?
For technical support, including MAX802REPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX802REPA+ requirements.
6.How does Aetrix verify that MAX802REPA+ is sourced from the original manufacturer or authorized distributors?
All MAX802REPA+ 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 MAX802REPA+ meets industry standards.
7.What is the process for return or replacement of MAX802REPA+?
All MAX802REPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX802REPA+, 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 MAX802REPA+ part is unused and in its original packaging.
Return procedure for MAX802REPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX802REPA+ Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
