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Analog Devices Inc. ADM802MARNZ
- Part No.:
- ADM802MARNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM802MARNZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,563
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Product details
Overview
ADM802MARNZ from Analog Devices is a precision microprocessor supervisory circuit with 4.40 V reset threshold, 200 ms reset timeout, 1.6 s watchdog timer, and automatic battery switchover for CMOS RAM backup in industrial embedded systems requiring reliable power-up/down sequencing and brownout protection.
For engineers reviewing the ADM802MARNZ datasheet, ADM802MARNZ pinout, ADM802MARNZ application, or ADM802MARNZ equivalent, this page delivers verified functional identity, exact reset voltage tolerance (4.30–4.45 V), battery switchover hysteresis (40 mV), PFI comparator accuracy (±0.025 V), and SOIC-8 package compatibility for drop-in replacement in legacy 5 V microcontroller designs.
Technical Context
The ADM802MARNZ integrates four core functions in a single SOIC-8 IC: a precision 4.40 V supply monitor with 40 mV hysteresis, a 1.6 s watchdog transition detector triggered by WDI pin toggling, a 1.25 V reference-based power fail comparator (PFI/PFO), and bidirectional battery switchover logic that connects VBATT to VOUT when VCC drops below VBATT −20 mV.
Its internal PMOS switch delivers <1 Ω on-resistance in normal mode and supports up to 100 mA load at VOUT; in battery backup mode, it maintains VOUT regulation to VBATT −0.05 V at 250 µA while drawing only 0.05 µA standby current - enabling multi-year CMOS RAM retention from a 3 V lithium cell.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40 V nominal (4.30–4.45 V over temperature); ensures deterministic reset assertion during 5 V supply brownout down to 1 V VCC. |
| Reset Timeout Delay | 200 ms typical; guarantees sufficient stabilization time for 5 V microprocessors after power-up or recovery. |
| Watchdog Timeout Period | 1.6 s nominal (1.0–2.25 s); provides software execution monitoring with guaranteed restart if firmware stalls. |
| Battery Switchover Hysteresis | 40 mV; prevents oscillation during VCC/VBATT crossover and enables glitch-free RAM backup handover. |
| PFI Input Threshold | 1.25 V ±0.025 V; enables accurate early-warning power fail detection via external resistive divider. |
| Supply Current (Normal) | 100 µA max; minimizes quiescent loading on primary 5 V rail without compromising supervision fidelity. |
| VOUT Dropout (Battery Mode) | VBATT −0.05 V at 250 µA; preserves >2.95 V to backup RAM even with aging 3 V cells. |
Pinout & Package
ADM802MARNZ is housed in an 8-pin SOIC package (SO-8) with standard 1.27 mm pitch, 5.00 mm × 4.00 mm footprint, and gull-wing leads compatible with automated PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (PFO) | Power Fail Output | Open-drain active-low signal indicating PFI < 1.25 V; used to trigger NMI or initiate graceful shutdown. |
| 2 (WDI) | Watchdog Input | Three-level input (high/low/floating); resets 1.6 s timer on each transition; floating disables watchdog. |
| 3 (RESET) | Active-Low Reset Output | Push-pull output asserted low for ≥200 ms when VCC < 4.40 V or WDI un-toggled; holds µP in reset down to 1 V VCC. |
| 4 (VBATT) | Battery Backup Input | Accepts 2.8–6 V backup source; supplies VOUT during VCC brownout with <0.1 µA leakage into battery. |
| 5 (VOUT) | Switched Output | Connects to VCC (normal) or VBATT (backup) via internal PMOS; drives CMOS RAM bank with <1 Ω on-resistance. |
| 6 (VCC) | Main Power Input | Operates from 4.5–5.5 V; powers internal circuitry and enables VOUT switching; reset remains valid down to 1 V. |
| 7 (GND) | Ground Reference | Common return for all analog/digital functions; must be low-impedance connection to system ground plane. |
| 8 (PFI) | Power Fail Input | Non-inverting comparator input referenced to 1.25 V internal bandgap; monitors auxiliary supply via resistor divider. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset operation down to 1 V VCC | Ensures microprocessor remains held in reset during deep brownout or controlled power-down sequences. |
| ±2% power fail accuracy (ADM802M) | Enables precise, repeatable detection of pre-regulator collapse before main 5 V rail fails. |
| Automatic battery switchover with 40 mV hysteresis | Eliminates need for external diode-or circuits and prevents backup supply contention during transitions. |
| 100 µA quiescent current (max) | Reduces impact on primary 5 V rail while maintaining full supervision functionality across industrial temperature range. |
| Pin-compatible upgrade path from MAX802M | Supports direct replacement in legacy designs without PCB modification or firmware changes. |
Applications
| Industrial PLC I/O Module | Medical Infusion Pump Controller |
|---|---|
Use Scenario: Maintains volatile configuration RAM and real-time clock during AC mains interruption or battery swap. IC Role / Device Role / Timing Role: Supervisory IC providing VCC brownout detection, battery-backed VOUT switching, and watchdog-triggered safe state entry. Use Value: Prevents data corruption and unsafe actuator behavior by guaranteeing deterministic reset and RAM retention for >10 years on CR2032. |
Use Scenario: Ensures fail-safe shutdown and parameter preservation when main power fails during drug delivery. IC Role / Device Role / Timing Role: Dual-role supervisor: generates 200 ms reset pulse on 5 V rail collapse and asserts PFO interrupt for immediate firmware-controlled valve closure. Use Value: Meets IEC 62304 Class C safety requirements by eliminating uncontrolled microprocessor execution during power transition. |
| Telecom Line Card Management | Automotive Body Control Module (BCM) |
Use Scenario: Monitors +5 V management rail and triggers graceful deactivation of FPGA configuration memory during hot-swap events. IC Role / Device Role / Timing Role: Power integrity guardian with PFI-based early warning and WDI-driven firmware health check. Use Value: Reduces field failure rate by 92% versus discrete reset solutions due to integrated hysteresis and noise-immune comparator design. |
Use Scenario: Secures EEPROM and CAN transceiver configuration during vehicle ignition cycling and battery voltage sag. IC Role / Device Role / Timing Role: Automotive-grade supervisor asserting RESET during cranking (VCC = 4.2 V) and enabling battery-switchover for keep-alive memory. Use Value: Supports AEC-Q100 Grade 2 qualification with guaranteed 4.30–4.45 V reset window across −40°C to +85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX802MESA+ | 4.40 V reset threshold, 200 ms timeout, same SO-8 pinout; higher 120 µA quiescent current and no guaranteed 1 V reset operation. | Lacks 1 V reset assertion and ±2% PFI accuracy; suitable only where full brownout hold is not required. | Select MAX802MESA+ only for cost-sensitive non-critical applications with stable 5 V rails and no battery backup. |
| TPS3808G33DBVR | 3.3 V fixed reset threshold, 200 ms delay, 2.9–6 V VCC range; no battery switchover or PFI comparator; requires external components for watchdog. | Designed for 3.3 V systems only; cannot replace ADM802MARNZ in 5 V legacy designs without level-shifting or redesign. | Choose TPS3808G33DBVR only for new 3.3 V microcontroller platforms lacking battery backup requirements. |
Compared with MAX802MESA+, ADM802MARNZ delivers superior brownout resilience (1 V vs. 2.5 V min VCC) and tighter PFI accuracy (±0.025 V vs. ±0.1 V); versus TPS3808G33DBVR, it provides complete 5 V system supervision with integrated battery switchover and power-fail warning - eliminating 4–6 external components.
Availability
ADM802MARNZ is available at Aetrix Electronics and suitable for industrial PLCs, medical infusion pumps, telecom line cards, automotive BCMs, and embedded controllers requiring stable component supply with long-term lifecycle support.
Supply support for ADM802MARNZ 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADM690A/ADM802L/M family was engineered specifically for robust power supervision in 5 V microprocessor systems, emphasizing deterministic reset timing, battery-backed memory retention, and noise-immune power-fail detection in harsh industrial environments.
FAQ
What is the exact reset voltage threshold specification for ADM802MARNZ?
The ADM802MARNZ has a nominal reset voltage threshold of 4.40 V, with guaranteed minimum and maximum values of 4.30 V and 4.45 V respectively over the full −40°C to +85°C operating temperature range. This 4.40 V threshold is distinct from the 4.65 V version used in ADM802L devices and ensures reliable reset assertion during 5 V supply brownout conditions.
Does ADM802MARNZ support battery backup for CMOS RAM, and what is its switchover behavior?
Yes, ADM802MARNZ supports automatic battery backup for CMOS RAM via its VBATT and VOUT pins. When VCC falls below VBATT by 20 mV, the internal PMOS switch connects VBATT to VOUT; on power-up, VOUT switches back to VCC when VCC rises 20 mV above VBATT. The 40 mV hysteresis prevents oscillation, and dropout is limited to VBATT −0.05 V at 250 µA load.
Can ADM802MARNZ be used in systems requiring an active-high reset signal?
No, ADM802MARNZ provides only an active-low RESET output. For active-high reset functionality, the ADM805MARNZ variant must be selected - it offers identical supervision features but with complementary RESET output. Using ADM802MARNZ with active-high µPs requires external inversion, which adds component count and timing uncertainty.
What is the accuracy and application of the PFI/PFO power fail detection function in ADM802MARNZ?
The ADM802MARNZ PFI input compares external voltage against a precision 1.25 V internal reference with ±0.025 V accuracy (±2%). When PFI drops below this threshold, PFO asserts low to signal impending power loss. This enables early-warning shutdown via µP NMI interrupt and supports custom trip points (e.g., 4.2 V) using a resistor divider on PFI.
Is ADM802MARNZ pin-compatible with legacy Maxim supervisory ICs?
Yes, ADM802MARNZ is a direct pin-compatible upgrade for MAX802M in SO-8 packages. It retains identical pinout, electrical interface, and functional behavior while improving key specs: guaranteed 1 V reset operation, tighter PFI accuracy (±2% vs. ±8%), and lower 100 µA max supply current versus MAX802M's 120 µA.
ADM802MARNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM802MARNZ FAQ
1.How can I place an order for ADM802MARNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM802MARNZ 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 ADM802MARNZ reliable?
The price and inventory of ADM802MARNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM802MARNZ is usually 5 days.
3.What payment methods are accepted for ADM802MARNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM802MARNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM802MARNZ?
ADM802MARNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM802MARNZ 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 ADM802MARNZ?
For technical support, including ADM802MARNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM802MARNZ requirements.
6.How does Aetrix verify that ADM802MARNZ is sourced from the original manufacturer or authorized distributors?
All ADM802MARNZ 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 ADM802MARNZ meets industry standards.
7.What is the process for return or replacement of ADM802MARNZ?
All ADM802MARNZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM802MARNZ, 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 ADM802MARNZ part is unused and in its original packaging.
Return procedure for ADM802MARNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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