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Analog Devices Inc. ADM800LARN-REEL
- Part No.:
- ADM800LARN-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM800LARN-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,016
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Product details
Overview
ADM800LARN-REEL from Analog Devices is a microprocessor supervisory circuit providing precision 4.65 V ±2% reset threshold, 200 ms fixed reset timeout, 1.6 s watchdog timeout (long period), automatic battery backup switchover, and chip enable gating - all in a 16-pin narrow SOIC package. It ensures reliable power-up/down sequencing and data integrity in battery-backed RAM systems for industrial controllers and embedded instrumentation.
For engineers reviewing the ADM800LARN-REEL datasheet, ADM800LARN-REEL pinout, ADM800LARN-REEL application, or ADM800LARN-REEL equivalent, key selection criteria include its 4.65 V reset threshold tolerance, 0.75 Ω VCC-to-VOUT on-resistance, 0.04 µA battery-backup supply current, and compatibility with 5 V ±5% power rails in mission-critical microprocessor monitoring.
Technical Context
The ADM800LARN-REEL integrates a precision bandgap-based voltage detector (4.65 V ±2%), an internal oscillator for timing control, and dual-path power switching logic that selects between VCC and VBATT based on voltage comparison and reset state. Its reset generator holds RESET low for 200 ms after VCC exceeds threshold, with guaranteed operation down to VCC = 1 V.
Watchdog functionality uses transition detection on WDI to restart a 1.6 s timeout counter; failure to toggle triggers a 200 ms RESET pulse and pulls WDO low. The CE gating circuit forces CEOUT high during reset regardless of CEIN, preventing spurious writes to CMOS RAM during brownouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±2% - matches +5 V supplies with –5% to +10% tolerance; ensures reset assertion before microprocessor malfunction. |
| Reset Timeout | 200 ms typ - provides stable power stabilization window post-power-up; adjustable via external capacitor or clock. |
| VCC-to-VOUT On-Resistance | 0.75 Ω typ - enables up to 250 mA output with ≤187 mV dropout at 250 mA, supporting high-current RAM banks. |
| Battery Backup Supply Current | 0.04 µA typ - extends backup battery life for years in low-power memory retention applications. |
| Watchdog Timeout (Long) | 1.6 s - allows sufficient software execution time between WDI toggles; first timeout after reset is always 1.6 s. |
| PFI Threshold | 1.25 V ±0.025 V - enables early power-fail warning via external resistor divider; supports predictive shutdown before VCC collapse. |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating. |
Pinout & Package
ADM800LARN-REEL is housed in a 16-pin narrow SOIC (R-16N) package, 3.9 mm × 9.9 mm, 1.27 mm pitch, RoHS-compliant, tape-and-reel format (REEL suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Backup Battery Input | Connects to backup source; internally switched to VOUT when VCC drops below reset threshold and VBATT > VCC – 0.03 V. |
| 2 VOUT | Switched Output | Delivers VCC or VBATT depending on switchover logic; drives RAM VCC with ≤0.75 Ω resistance from VCC path. |
| 3 VCC | Main Power Input | +5 V supply input; monitored for reset generation; functional down to 1 V. |
| 4 GND | Ground Reference | Common return for all analog and digital functions; required for accurate voltage detection. |
| 5 BATT ON | Battery Status Output | Open-drain logic-high signal indicating VBATT is active on VOUT; can drive PNP base for external current boost. |
| 6 LOW LINE | Power-Fail Indicator | Active-low output asserting when VCC < reset threshold; used for system status signaling or interrupt generation. |
| 7 OSC IN | Oscillator Control Input | Accepts external clock (≤250 kHz) or capacitor (47 pF typical) to adjust reset/watchdog timing; floating selects 1.6 s/200 ms defaults. |
| 8 OSC SEL | Oscillator Mode Select | High/floating enables internal oscillator; low enables external clock/capacitor mode; includes 10 µA internal pullup. |
| 9 PFI | Power-Fail Input | Non-inverting comparator input referenced to 1.25 V; monitors auxiliary supply or divided VCC for early warning. |
| 10 PFO | Power-Fail Output | Active-low comparator output; asserts when PFI < 1.25 V; typically connected to µP NMI line. |
| 11 WDI | Watchdog Input | Three-level input (low/mid/high); reset triggered if no transition occurs within watchdog timeout period. |
| 12 CEOUT | Gated Chip Enable Output | Replicates CEIN when VCC is valid; forced high during reset to block RAM writes under unstable supply. |
| 13 CEIN | Chip Enable Input | Direct input to CE gating logic; tied to GND or VOUT if unused. |
| 14 WDO | Watchdog Output | Active-low status flag; goes low on watchdog timeout and remains low until next WDI transition. |
| 15 RESET | Active-Low Reset Output | Open-collector output; asserts low during power-up, brownout, or watchdog fault; held for 200 ms minimum post-recovery. |
| 16 RESET | Active-High Reset Output | Inverted complement of RESET; supports µPs requiring active-high reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| 4.65 V ±2% Precision Reset Threshold | Enables robust compatibility with standard +5 V ±5% power rails while avoiding false resets during ripple or transient dips. |
| 0.04 µA Battery-Backup Supply Current | Extends lithium or supercapacitor backup life beyond 10 years in always-on memory retention applications. |
| VCC-to-VOUT On-Resistance ≤0.75 Ω | Minimizes voltage drop under 250 mA load, preserving RAM operating margin and reducing thermal stress. |
| Integrated CE Gating with 5 ns Propagation Delay | Prevents corrupted writes to battery-backed RAM during power transitions without adding external logic delay. |
| 1.25 V ±0.025 V PFI Reference | Supports configurable early power-fail detection with hysteresis addition via external feedback resistor. |
| Guaranteed Operation Down to VCC = 1 V | Maintains RESET assertion through deep brownouts, ensuring microprocessor remains held in safe state until full recovery. |
Applications
| Industrial Programmable Logic Controller (PLC) | Automotive Body Control Module (BCM) |
|---|---|
Use Scenario: Monitors 5 V system rail in PLC backplane during mains fluctuations and battery switchover. IC Role / Device Role / Timing Role: Supervisory IC providing reset hold, watchdog supervision, and RAM write protection during brownouts. Use Value: Prevents firmware corruption and maintains real-time I/O state integrity during 100 ms–500 ms grid interruptions. |
Use Scenario: Secures EEPROM and SRAM in BCM during engine cranking-induced 6–9 V battery dips. IC Role / Device Role / Timing Role: Voltage monitor and backup switcher ensuring nonvolatile memory retention and controlled reset sequencing. Use Value: Guarantees CAN message buffer preservation and prevents unintended relay actuation during cold-crank events. |
| Medical Infusion Pump Controller | Smart Energy Meter with Tamper-Resistant Memory |
Use Scenario: Maintains volatile therapy parameter storage during AC power loss using coin-cell backup. IC Role / Device Role / Timing Role: Battery switchover controller and watchdog supervisor enforcing fail-safe shutdown protocol. Use Value: Enables deterministic 200 ms reset window and 1.6 s software sanity check before resuming drug delivery. |
Use Scenario: Protects metrology calibration data and tariff logs during utility power outages and magnetic tampering events. IC Role / Device Role / Timing Role: Dual-role supervisor: PFI-triggered NMI interrupt for data save, then battery-backed RAM retention. Use Value: Achieves IEC 62056-21 compliance by guaranteeing ≥10-year data retention with <0.1 µA backup leakage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM800MARN-REEL | 4.4 V ±2% reset threshold; otherwise identical pinout, timing, and feature set. | Suitable for 5 V ±10% supplies; less margin against overvoltage but wider input tolerance. | Select when system VCC regulation is looser and 4.4 V trip point better aligns with brownout detection requirements. |
| MAX691ACPE+ | 4.65 V ±3% threshold; 100 µA standby current; no adjustable watchdog; DIP-16 only. | Lacks OSC IN/OSC SEL flexibility and low-power battery mode; legacy footprint. | Choose only for direct DIP-16 replacement where SOIC space constraints or ultra-low battery current are not critical. |
Compared with ADM800MARN-REEL, ADM800LARN-REEL offers tighter reset threshold tolerance (±2% vs ±2%) and lower battery current (0.04 µA vs 0.1 µA), making it preferable for long-life backup; versus MAX691ACPE+, it delivers superior integration, SOIC packaging, and modern power efficiency but requires PCB redesign.
Availability
ADM800LARN-REEL is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical infusion pump controllers, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for ADM800LARN-REEL 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 ADM691A/ADM693A/ADM800L/M family was designed specifically for microprocessor system supervision - integrating reset, watchdog, battery switchover, CE gating, and power-fail warning in a single IC to replace discrete solutions in space-constrained embedded designs.
FAQ
What is the reset threshold voltage of the ADM800LARN-REEL and how tightly is it specified?
The ADM800LARN-REEL features a precision reset threshold of 4.65 V with a guaranteed tolerance of ±2%, meaning the actual trip point falls between 4.55 V and 4.75 V at +25°C. This tight specification ensures reliable reset assertion for +5 V systems operating within –5% to +10% supply tolerance, preventing premature or delayed resets during line transients. The ADM800LARN-REEL's threshold is distinct from the 4.4 V variant (ADM800M) and is validated per Analog Devices' Rev. 0 datasheet specifications.
Does the ADM800LARN-REEL support external adjustment of its reset and watchdog timeout periods?
Yes, the ADM800LARN-REEL supports external adjustment via the OSC IN and OSC SEL pins. With OSC SEL grounded, connecting a capacitor (e.g., 47 pF) from OSC IN to GND sets the reset active period to 200 ms and watchdog timeout to 1.6 s; varying the capacitor scales both linearly. Alternatively, applying an external clock to OSC IN yields reset timeout = 2048 × (1/fCLK) and watchdog timeout = 1024 × (1/fCLK). These configurations are fully supported in the ADM800LARN-REEL's functional block diagram and timing tables.
How does the ADM800LARN-REEL handle battery backup switchover, and what is its VOUT drive capability?
The ADM800LARN-REEL automatically switches VOUT between VCC and VBATT based on voltage comparison and reset state. In normal operation, VCC is routed to VOUT through a PMOS switch with 0.75 Ω typical on-resistance, supporting up to 250 mA. In backup mode, VBATT connects via a 7 Ω MOSFET, delivering low-dropout operation at microamp-level currents. The ADM800LARN-REEL's VOUT performance is characterized across temperature and load in Figures 5–7 of its datasheet, confirming stability under real-world conditions.
Can the ADM800LARN-REEL be used to protect EEPROM or NOVRAM write operations, not just CMOS RAM?
Yes, the ADM800LARN-REEL's CEOUT output is explicitly designed for write protection of nonvolatile memories. When VCC falls below the reset threshold, CEOUT is forced high - independent of CEIN - blocking write strobes to EEPROM, EAROM, or NOVRAM devices. Application Note AN-268 and Figure 20 in the ADM800LARN-REEL datasheet confirm this use case, noting CEOUT's ability to drive Store/Write inputs directly, preserving data integrity during power faults.
What is the maximum continuous current the ADM800LARN-REEL can deliver from its VOUT pin when powered from VCC?
The ADM800LARN-REEL guarantees continuous VOUT sourcing of 250 mA when powered from VCC, with a typical VCC-to-VOUT voltage drop of ≤187 mV (0.75 Ω × 250 mA). At 25 mA, the drop is ≤20 mV. These values are measured per the "VCC to VOUT Output Resistance" and "VOUT Output Voltage" specifications in the Absolute Maximum Ratings and Electrical Characteristics tables of the official ADM800LARN-REEL datasheet, and remain valid across the full –40°C to +85°C operating range.
ADM800LARN-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ADM800LARN-REEL FAQ
1.How can I place an order for ADM800LARN-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM800LARN-REEL 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 ADM800LARN-REEL reliable?
The price and inventory of ADM800LARN-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM800LARN-REEL is usually 5 days.
3.What payment methods are accepted for ADM800LARN-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM800LARN-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM800LARN-REEL?
ADM800LARN-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM800LARN-REEL 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 ADM800LARN-REEL?
For technical support, including ADM800LARN-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM800LARN-REEL requirements.
6.How does Aetrix verify that ADM800LARN-REEL is sourced from the original manufacturer or authorized distributors?
All ADM800LARN-REEL 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 ADM800LARN-REEL meets industry standards.
7.What is the process for return or replacement of ADM800LARN-REEL?
All ADM800LARN-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM800LARN-REEL, 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 ADM800LARN-REEL part is unused and in its original packaging.
Return procedure for ADM800LARN-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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