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Analog Devices Inc. ADM802MAN
- Part No.:
- ADM802MAN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADM802MAN.pdf
- Description:
- IC SUPERVISOR MPU 4.40V WD 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:16,702
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Product details
Overview
ADM802MAN from Analog Devices is a precision microprocessor supervisory circuit in 8-pin DIP packaging, providing active-low reset assertion at 4.40 V nominal threshold, 200 ms reset timeout, 1.6 s watchdog timer, and automatic battery switchover for CMOS RAM backup. It operates with VCC as low as 1 V and supports power-fail detection via 1.25 V internal reference.
For engineers reviewing the ADM802MAN datasheet, ADM802MAN pinout, ADM802MAN application, or ADM802MAN equivalent, key selection criteria include its 4.40 V reset threshold (vs. 4.65 V variants), ±2% PFI accuracy, battery switchover hysteresis of 40 mV, and compatibility with industrial-temperature (–40°C to +85°C) embedded systems requiring reliable power monitoring and fail-safe recovery.
Technical Context
The ADM802MAN integrates four core functions: a precision voltage monitor with 4.40 V reset threshold and 40 mV hysteresis; a 1.6 s watchdog timer triggered by WDI transitions; a battery switchover circuit with 20 mV power-up/down thresholds and <1 Ω on-resistance; and a 1.25 V reference-based power-fail comparator with ±2% accuracy on PFI input.
Its RESET output remains functional down to VCC = 1 V, ensuring deterministic microprocessor hold during brownout, while VOUT delivers up to 100 mA in normal mode and switches seamlessly to VBATT when VCC drops below threshold - all within an industrial-grade 8-pin DIP package rated for –40°C to +85°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40 V nominal (4.25 V min / 4.50 V max); ensures reliable reset initiation during 5 V supply brownout. |
| Reset Timeout Delay | 200 ms typical (140–280 ms range); provides sufficient stabilization time for microprocessor startup after power recovery. |
| Watchdog Timeout Period | 1.6 s nominal (1.0–2.25 s range); enables software execution verification without false triggers from transient I/O noise. |
| Power Fail Input Accuracy | ±2% on PFI (1.225–1.275 V range at 25°C); supports precise early-warning detection of falling input rails. |
| Supply Current | 100 µA max (70–100 µA typical); minimizes standby power draw in always-on monitoring applications. |
| Battery Switchover Hysteresis | 40 mV; prevents oscillation during VCC/VBATT crossover during power-up or power-down transitions. |
| VCC Operating Range | 4.5 V to 5.5 V; compatible with standard 5 V TTL/CMOS logic rails and regulated supplies. |
Pinout & Package
ADM802MAN is housed in an 8-pin plastic DIP (N-8) package with 0.300-inch width, 0.100-inch lead pitch, and through-hole mounting. Pin 1 is marked by a notch or dot; leads are tin-lead plated with RoHS-compliant options available.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PFO) | Power Fail Output | Active-low open-drain signal indicating PFI < 1.25 V; used to trigger NMI or initiate graceful shutdown. |
| 2 (WDI) | Watchdog Input | Three-level input (high/low/floating); toggling resets 1.6 s timer; floating disables watchdog function. |
| 3 (RESET) | Reset Output | Active-low push-pull output; asserts for 200 ms when VCC < 4.40 V or WDI un-toggled; functional down to VCC = 1 V. |
| 4 (VBATT) | Battery Backup Input | Accepts 2.8 V+ backup source; supplies VOUT when VCC falls below threshold; sourcing current < 0.1 µA. |
| 5 (VOUT) | Output Voltage | Switched output connected to VCC (normal) or VBATT (backup); supports 100 mA load with <1 Ω on-resistance. |
| 6 (VCC) | Primary Power Input | +5 V nominal supply input; powers internal circuitry and enables VOUT switching; operates from 4.5–5.5 V. |
| 7 (GND) | Ground Reference | Common return path for all analog and digital functions; must be low-impedance connection to system ground plane. |
| 8 (PFI) | Power Fail Input | Non-inverting input to 1.25 V comparator; monitors external rail via resistive divider; ±2% trip accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset operation down to VCC = 1 V | Ensures microprocessor remains held in valid reset state even during deep brownout conditions. |
| ±2% power fail detection accuracy | Enables precise early-warning threshold setting for critical power rails without external calibration. |
| Automatic battery switchover with 40 mV hysteresis | Eliminates chatter during VCC/VBATT crossover and extends backup battery life via ultra-low standby current (0.05 µA). |
| 1.6 s watchdog timer with transition-sensitive input | Verifies software liveness using simple GPIO toggle-no clock or timing-critical firmware overhead required. |
| Pin-compatible upgrade path from MAX802M | Enables drop-in replacement in legacy designs without PCB or firmware changes. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Continuous operation in factory-floor automation where mains power fluctuations risk data corruption in volatile RAM. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, battery-backed RAM retention, and watchdog-enforced firmware recovery. Use Value: Prevents spurious reboots during 5 V rail sag; maintains SRAM contents for >10 years using 3 V lithium coin cell; eliminates need for external reset supervisor IC. |
Use Scenario: Portable ultrasound device requiring guaranteed safe shutdown before battery depletion compromises image integrity. IC Role / Device Role / Timing Role: Power-fail detector triggering NMI-driven save-and-halt sequence, backed by 200 ms reset hold for processor stabilization. Use Value: Uses PFI/PFO to detect falling 5 V rail 500 ms before cutoff; guarantees full frame buffer write to nonvolatile storage prior to power loss. |
| Telecom Base Station Management | Automotive Infotainment Head Unit |
Use Scenario: Remote radio unit powered by PoE with intermittent upstream link causing supply ripple and thermal cycling. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors primary 5 V PoE rail and secondary 3.3 V management controller supply via PFI divider. Use Value: Simultaneous reset assertion and PFO warning enable coordinated restart of RF and baseband subsystems without race conditions. |
Use Scenario: In-vehicle infotainment system exposed to cold-crank (4.5 V) and load-dump (18 V) transients per ISO 7637-2. IC Role / Device Role / Timing Role: Primary reset generator and watchdog enforcer for ARM Cortex-A53 application processor during ignition cycles. Use Value: Resets processor reliably during cold-crank brownout (VCC ≥ 4.5 V); watchdog recovers hung UI stack without requiring user intervention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM802MARN | Same electrical specs but SO-8 surface-mount package; 110°C/W θJA vs. 120°C/W for DIP. | Required for automated SMT assembly; unsuitable for through-hole prototyping or repair. | Select ADM802MARN when board space or reflow compatibility is prioritized over manual serviceability. |
| MAX802M | Legacy Maxim part; identical 4.40 V reset threshold and 1.6 s watchdog, but higher 150 µA quiescent current and no ±2% PFI accuracy spec. | Lacks guaranteed PFI accuracy; requires external hysteresis for noisy environments. | Choose MAX802M only for legacy design continuity where ADM802MAN is unavailable; expect reduced power-fail reliability. |
Compared with ADM802MARN, ADM802MAN offers easier hand-soldering and thermal margin in convection-cooled enclosures; compared with MAX802M, it delivers tighter PFI accuracy and lower supply current-critical for battery-backed or energy-constrained deployments.
Availability
ADM802MAN is available at Aetrix Electronics and suitable for industrial control systems, medical instrumentation, telecom infrastructure, and automotive electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM802MAN 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The ADM690A/ADM692A/ADM802L/M/ADM805L/M family was designed specifically for robust, single-chip power supervision in microprocessor-based systems where reliability under voltage stress, battery backup integrity, and watchdog-enforced firmware health are mission-critical.
FAQ
What is the exact reset voltage threshold for ADM802MAN?
The ADM802MAN has a nominal reset voltage threshold of 4.40 V, with guaranteed minimum and maximum values of 4.25 V and 4.50 V respectively over the full –40°C to +85°C operating range. This threshold is fixed and not adjustable; it is optimized for compatibility with standard 5 V logic rails experiencing brownout conditions.
Does ADM802MAN support battery backup for CMOS RAM, and how does switchover work?
Yes, ADM802MAN supports automatic battery backup for CMOS RAM via its VBATT and VOUT pins. When VCC falls below the reset threshold and drops at least 20 mV below VBATT, the internal PMOS switch connects VBATT to VOUT. During power-up, VOUT switches back to VCC once VCC rises 20 mV above VBATT - all with 40 mV hysteresis to prevent oscillation.
Can the watchdog timer in ADM802MAN be disabled, and how?
Yes, the watchdog timer in ADM802MAN can be disabled by leaving the WDI pin floating or connecting it to a high-impedance (three-state) logic output. The timer only activates when WDI receives regular transitions; static high or low states for >1.6 s will assert RESET. No configuration register or external component is needed to disable it.
What is the accuracy of the power fail detection function in ADM802MAN?
The ADM802MAN guarantees ±2% accuracy on its power fail input (PFI) threshold, with a nominal 1.25 V internal reference and specified trip range of 1.225 V to 1.275 V at TA = 25°C. This accuracy applies specifically to the ADM802L/M variants and enables precise, calibration-free monitoring of auxiliary power rails.
Is ADM802MAN pin-compatible with older MAXIM supervisory ICs?
Yes, ADM802MAN is a pin-compatible upgrade for MAX802M in 8-pin DIP packaging. It retains identical pinout, reset behavior, and functional interface while improving key parameters: lower quiescent current (100 µA vs. 150 µA), guaranteed ±2% PFI accuracy, and enhanced VCC brownout operation down to 1 V.
ADM802MAN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- 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:
- -
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ADM802MAN FAQ
1.How can I place an order for ADM802MAN through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM802MAN 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 ADM802MAN reliable?
The price and inventory of ADM802MAN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM802MAN is usually 5 days.
3.What payment methods are accepted for ADM802MAN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM802MAN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM802MAN?
ADM802MAN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM802MAN 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 ADM802MAN?
For technical support, including ADM802MAN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM802MAN requirements.
6.How does Aetrix verify that ADM802MAN is sourced from the original manufacturer or authorized distributors?
All ADM802MAN 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 ADM802MAN meets industry standards.
7.What is the process for return or replacement of ADM802MAN?
All ADM802MAN units undergo pre-shipment inspection (PSI). If there is an issue with ADM802MAN, 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 ADM802MAN part is unused and in its original packaging.
Return procedure for ADM802MAN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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