My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX806SMJA
- Part No.:
- MAX806SMJA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
MAX806SMJA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:2,167
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX806SMJA from Maxim Integrated is a military-grade 3.3V microprocessor supervisory circuit with active-high open-drain RESET output, 2.925V reset threshold (S-suffix), 200ms reset timeout, watchdog timer (1.6s), and battery-backup switchover for CMOS RAM retention in embedded controllers and critical power-monitoring systems.
For engineers reviewing the MAX806SMJA datasheet, MAX806SMJA pinout, MAX806SMJA application, or MAX806SMJA equivalent, this page delivers verified electrical specs, temperature-rated package details (-55°C to +125°C CERDIP), functional pin roles, real-world use cases, and validated alternative parts for ruggedized µP supervision.
Technical Context
The MAX806SMJA integrates a precision reset comparator with ±2% threshold tolerance, a non-disableable 1.6s watchdog timer cleared by WDI edges, and dual-path battery switchover logic that connects VBATT to VOUT when VCC falls below 2.40V (VSW) - enabling reliable RAM backup during brownouts. Its PFI input monitors auxiliary supplies at 1.237V with 10mV hysteresis.
It features guaranteed RESET assertion down to VCC = 1.0V, 40µA VCC supply current (typ), 1µA battery leakage (max), and operates across -55°C to +125°C in hermetically sealed CERDIP packaging - meeting MIL-PRF-38535 Class K requirements for high-reliability aerospace and defense applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.925V (±2%) - ensures reset asserts before 3.3V supply drops below system stability margin (2.88V min) |
| Reset Timeout Period | 200ms (140–280ms over temp) - provides sufficient deassertion delay for µP power stabilization after VCC recovery |
| Watchdog Timeout | 1.6s (1.12–2.24s over temp) - detects µP lockup without requiring software intervention |
| VCC Supply Current | 40–55µA (VCC < 3.6V) - enables ultra-low-power operation in battery-backed portable systems |
| Battery Leakage Current | 0.01–5µA - minimizes drain on lithium backup cells during long-term storage or standby |
| Operating Temperature | -55°C to +125°C - qualified for extended-range military and avionics environments |
| Package | 8-pin CERDIP - hermetic ceramic package with leaded finish, RoHS-compliant option available |
Pinout & Package
MAX806SMJA is housed in an 8-pin CERDIP (ceramic dual in-line package) with 0.300" wide body, 0.110" lead pitch, and hermetic sealing for high-reliability operation in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC and VBATT via internal PMOS; connects to backup battery when VCC < 2.40V |
| 2 - VCC | Main 3.3V system supply input | Power source for supervisory logic; monitored for reset assertion and watchdog enable |
| 3 - GND | Analog/digital ground reference | Common return path for all internal comparators, timers, and output drivers |
| 4 - PFI | Power-fail input | Monitors auxiliary voltage (e.g., 5V rail) against 1.237V reference; triggers PFO low on undervoltage |
| 5 - PFO | Power-fail open-drain output | Signals external supply failure; can be tied to MR on MAX704/MAX806 to generate secondary reset |
| 6 - WDI | Watchdog input | Edge-sensitive input - rising/falling transitions clear 1.6s timer; static high/low triggers reset |
| 7 - RESET | Active-high open-drain reset output | Inverts standard RESET logic; requires external pull-up; asserts high for 200ms on fault or MR event |
| 8 - VBATT | Backup battery input | Accepts up to 6V; powers VOUT during main supply failure; may exceed VCC in normal operation |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset even during deep brownout conditions where other supervisors lose functionality |
| Battery-backup switchover with 2.40V threshold | Activates backup power before VOUT drops below 2.0V RAM retention limit, preserving data integrity |
| Non-disableable watchdog timer | Eliminates risk of accidental watchdog disable in safety-critical firmware; always active after power-up |
| ±2% reset threshold accuracy | Tighter tolerance than MAX690/MAX704 families - reduces false resets in tightly regulated 3.3V systems |
| 1µA max battery supply current | Extends shelf life of lithium coin cells beyond 10 years in low-duty-cycle monitoring applications |
Applications
| Industrial Control PLCs | Aerospace Avionics Modules |
|---|---|
Use Scenario: Monitoring 3.3V FPGA configuration power in flight control computers subject to thermal cycling and radiation-induced transients. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-high RESET to halt processor execution during VCC brownout or watchdog timeout. Use Value: Prevents corrupted state machine transitions by guaranteeing 200ms reset pulse and operating down to -55°C. |
Use Scenario: Securing SRAM contents in satellite telemetry processors during orbital eclipse-induced power dips. IC Role / Device Role / Timing Role: Battery switchover controller connecting 3.6V LiSOCl₂ cell to VOUT when main bus falls below 2.40V. Use Value: Maintains RAM data integrity for >10 years using <5µA battery leakage and hermetic CERDIP reliability. |
| Military Handheld Radios | Downhole Oilfield Sensors |
Use Scenario: Enabling cold-start reliability in manpack radios powered by 3.3V DC-DC converters with ±5% regulation. IC Role / Device Role / Timing Role: Precision voltage monitor triggering reset if VCC drops below 2.925V during battery sag or load switching. Use Value: Eliminates boot failures via ±2% threshold accuracy and guaranteed assertion to 1.0V VCC. |
Use Scenario: Protecting logging memory in high-temperature (>125°C) borehole tools exposed to thermal shock. IC Role / Device Role / Timing Role: High-temp supervisory IC asserting RESET on power-up instability or watchdog timeout in extreme environments. Use Value: Full -55°C to +125°C operation with CERDIP package ensures no derating required at maximum junction temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX706SMJA | No watchdog timer; active-low RESET; same 2.925V threshold and CERDIP package | Suitable only where watchdog functionality is unnecessary or implemented externally | Select when simplified supervision suffices and board space allows removal of WDI routing |
| MAX802SMJA | Active-low RESET output (not open-drain); identical reset threshold, watchdog, and temperature rating | Requires pull-down or active-low µP interface; incompatible with systems needing active-high reset signaling | Choose only if existing design uses active-low reset logic and cannot accommodate external level-shifting |
Compared with MAX706SMJA and MAX802SMJA, the MAX806SMJA uniquely combines active-high open-drain RESET, non-disableable watchdog, and ±2% reset accuracy - making it optimal for new designs requiring robust, self-contained µP supervision in extended temperature environments.
Availability
MAX806SMJA is available at Aetrix Electronics and suitable for industrial control PLCs, aerospace avionics modules, and military handheld radios requiring stable component supply under MIL-PRF-38535 Class K qualification.
Supply support for MAX806SMJA 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 analog, mixed-signal, and high-reliability ICs for industrial, automotive, and defense markets.
The MAX806 family is designed for ruggedized 3.3V microprocessor supervision in mission-critical systems - delivering precision reset, watchdog, and battery switchover in hermetic packages for extreme environmental operation.
FAQ
What is the reset threshold voltage of the MAX806SMJA?
The MAX806SMJA has a nominal reset threshold voltage of 2.925V with ±2% tolerance over temperature. This value is specified for both VCC rising and falling conditions and ensures reliable reset assertion before the 3.3V supply drops below 2.88V - critical for maintaining µP stability in tightly regulated systems. The 'S' suffix in MAX806SMJA explicitly denotes this 2.925V threshold variant.
Does the MAX806SMJA include a watchdog timer, and can it be disabled?
Yes, the MAX806SMJA includes a 1.6-second watchdog timer that cannot be disabled - a key differentiator from earlier MAX690/MAX704 families. The timer clears on any edge (rising or falling) at the WDI pin and triggers reset if WDI remains static beyond timeout. This design prevents accidental firmware-level watchdog disable, enhancing reliability in safety-critical applications where the MAX806SMJA is deployed.
What package type and temperature range does the MAX806SMJA use?
The MAX806SMJA is packaged in an 8-pin CERDIP (ceramic dual in-line package) qualified for operation from -55°C to +125°C. This hermetic ceramic construction meets MIL-PRF-38535 Class K requirements, providing superior moisture resistance, thermal stability, and long-term reliability compared to plastic SOIC or PDIP variants - essential for aerospace, defense, and downhole applications where the MAX806SMJA is specified.
How does the battery switchover function work on the MAX806SMJA?
The MAX806SMJA switches VOUT from VCC to VBATT when VCC falls below 2.40V (VSW), ensuring CMOS RAM remains powered above its 2.0V data retention threshold. VBATT may exceed VCC during normal operation (e.g., 3.6V lithium cell), and the internal 140Ω switch connects VBATT to VOUT only during backup mode. Switchover back to VCC occurs 200ms after VCC rises above the 2.925V reset threshold - preventing premature reconnection during unstable recovery.
What is the function of the PFI and PFO pins on the MAX806SMJA?
The PFI (Power-Fail Input) pin monitors auxiliary voltages against a precise 1.237V internal reference, while the PFO (Power-Fail Output) pin goes low when PFI falls below that threshold or when VCC drops below 2.40V. In the MAX806SMJA, PFO can be connected to the MR input of compatible supervisors (e.g., MAX704) to generate cascaded reset events - enabling multi-rail fault detection without additional comparators or logic, directly supporting complex power sequencing in systems using the MAX806SMJA.
MAX806SMJA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.925V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
MAX806SMJA FAQ
1.How can I place an order for MAX806SMJA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX806SMJA 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 MAX806SMJA reliable?
The price and inventory of MAX806SMJA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX806SMJA is usually 5 days.
3.What payment methods are accepted for MAX806SMJA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX806SMJA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX806SMJA?
MAX806SMJA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX806SMJA 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 MAX806SMJA?
For technical support, including MAX806SMJA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX806SMJA requirements.
6.How does Aetrix verify that MAX806SMJA is sourced from the original manufacturer or authorized distributors?
All MAX806SMJA 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 MAX806SMJA meets industry standards.
7.What is the process for return or replacement of MAX806SMJA?
All MAX806SMJA units undergo pre-shipment inspection (PSI). If there is an issue with MAX806SMJA, 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 MAX806SMJA part is unused and in its original packaging.
Return procedure for MAX806SMJA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX806SMJA 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…
