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Analog Devices Inc. ADM800MARN-REEL
- Part No.:
- ADM800MARN-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM800MARN-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,920
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Product details
Overview
ADM800MARN-REEL from Analog Devices is a microprocessor supervisory circuit integrating power-on reset, battery backup switchover, watchdog timer, chip enable gating, and power-fail detection. It features a 4.4 V ±2% reset threshold, 200 ms fixed reset timeout, 1.6 s/100 ms selectable watchdog timeout, and supports VCC down to 1 V operation. It is used in industrial controllers and automotive ECUs for reliable power monitoring and data retention during brownouts.
For engineers reviewing the ADM800MARN-REEL datasheet, ADM800MARN-REEL pinout, ADM800MARN-REEL application, or ADM800MARN-REEL equivalent, key selection criteria include its 4.4 V reset threshold tolerance, battery switchover hysteresis (60 mV), VOUT drive capability (250 mA), low standby current (0.04 µA in backup mode), and dual RESET outputs (active-low and open-drain complement).
Technical Context
The ADM800MARN-REEL implements a precision bandgap-based voltage detector with 4.4 V ±2% threshold and 15 mV hysteresis, ensuring stable reset assertion across temperature. Its internal PMOS VCC-to-VOUT switch exhibits 0.8–1.2 Ω on-resistance at 25 mA, while the VBATT-to-VOUT MOSFET delivers <0.3 V dropout at 5–20 mA under varying battery voltages (2.0–4.5 V).
Watchdog timing uses either an internal oscillator (1.6 s long / 100 ms short period) or external clock/capacitor configuration; WDI input accepts three-level logic (0.8 V low, 0.75×VCC high) and resets on any transition. CE gating provides 6–10 ns propagation delay and 40–150 Ω ON-resistance, with CEOUT forced high during reset regardless of CEIN state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.4 V ±2% - matches 5 V ±10% supplies; guarantees reset assertion before microprocessor instability. |
| Reset Timeout | 200 ms typ - holds processor in reset long enough for power and clock stabilization after power-up. |
| VOUT Drive (VCC mode) | 250 mA max, VCC–0.02 V min - powers CMOS RAM banks without external pass transistor under typical loads. |
| Battery Switchover Hysteresis | 60 mV - prevents oscillation during VCC/VBATT crossover near switchover point. |
| Standby Current (Backup) | 0.04 µA typ - enables multi-year operation on coin-cell batteries during extended power loss. |
| Power Fail Detection | 1.25 V threshold (±0.025 V) - allows precise early warning of supply collapse via external resistor divider. |
| WDI Input Logic Levels | 0.8 V low / 0.75×VCC high - compatible with TTL and CMOS I/O, tolerant of noise on watchdog strobe line. |
Pinout & Package
ADM800MARN-REEL is housed in a 16-pin narrow SOIC (R-16N) package, 7.5 mm × 10.3 mm body, 1.27 mm pitch, RoHS-compliant, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Backup battery input | Connects to Li/MnO₂ cell or supercapacitor; enables seamless switchover when VCC drops below reset threshold. |
| 2 VOUT | Switched output rail | Delivers VCC or VBATT (whichever is higher and valid) to RAM; supports 250 mA continuous load from VCC path. |
| 3 VCC | Main supply input | Accepts 4.5–5.5 V; internal circuitry remains functional down to 1 V for brownout-safe reset hold. |
| 4 GND | Ground reference | Common return for all analog/digital functions; must be low-impedance to ensure accurate voltage detection. |
| 5 BATT ON | Battery status indicator | Active-high signal indicating VBATT is active on VOUT; can drive base of external PNP for >250 mA loads. |
| 6 LOW LINE | Supply undervoltage flag | Asserts low immediately when VCC falls below 4.4 V; used for real-time system health monitoring. |
| 7 OSC IN | Oscillator control input | Selects watchdog/reset timing: grounded = 100 ms WD, floating = 1.6 s WD, capacitor-driven = adjustable. |
| 8 OSC SEL | Oscillator mode select | High/floating = internal oscillator; low = external clock/capacitor mode; includes 10 µA internal pullup. |
| 9 PFI | Power fail comparator input | Non-inverting input referenced to 1.25 V; monitors auxiliary supply or unregulated rail for predictive shutdown. |
| 10 PFO | Power fail comparator output | Open-drain output asserting low when PFI < 1.25 V; typically interrupts µP NMI line to trigger save-and-shutdown. |
| 11 WDI | Watchdog input | Three-level input; reset triggered if no transition occurs within timeout period; disabled when floating. |
| 12 CEOUT | Gated chip enable output | Passes CEIN when VCC is valid; forced high during reset to block RAM writes during power instability. |
| 13 CEIN | Chip enable input | Directly controls CEOUT; tied to GND or VOUT if unused to prevent floating input and spurious gating. |
| 14 WDO | Watchdog status output | Active-low open-drain output signaling watchdog timeout; resets high on next WDI transition. |
| 15 RESET | Active-low reset output | Drives µP reset pin low during power-up/down/brownout; guaranteed 200 ms pulse after VCC recovery. |
| 16 RESET | Active-high reset complement | Open-drain output providing inverted RESET signal for processors requiring active-high reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable watchdog timeout | Configurable via OSC SEL/OSC IN to 100 ms, 1.6 s, or externally set (capacitor/clock) - enables tuning to software execution time margins. |
| Dual RESET outputs | RESET (active-low push-pull) and RESET (active-high open-drain) - eliminates need for external inverters in mixed-logic systems. |
| Low-power battery backup | 0.04 µA typical supply current in backup mode - extends coin-cell life beyond 10 years in always-on monitoring applications. |
| Integrated CE gating | CEOUT forced high during reset regardless of CEIN state - prevents corrupted RAM writes during power transients without external logic. |
| Precision 1.25 V reference | Used for PFI comparator and internal biasing - enables accurate power-fail warning independent of VCC variation. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Maintains RAM contents and ensures deterministic restart after engine cranking voltage dip (4.2–4.8 V). IC Role / Device Role / Timing Role: Supervisory IC providing reset hold, battery switchover, and watchdog supervision during 100–500 ms brownouts. Use Value: Prevents EEPROM corruption and ensures CAN bus reinitialization completes before application code resumes. |
Use Scenario: Monitors 5 V supply derived from vehicle battery; triggers safe shutdown before ignition-off voltage collapse. IC Role / Device Role / Timing Role: Power supervisor with PFI-driven NMI interrupt and 200 ms reset delay for controlled firmware save sequence. Use Value: Guarantees nonvolatile memory write completion using PFO-triggered interrupt before VCC drops below 3.3 V. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Retains therapy parameters and event logs during AC mains interruption backed by supercapacitor. IC Role / Device Role / Timing Role: Battery switchover controller and watchdog timer ensuring safety-critical firmware integrity. Use Value: Enables >24-hour backup runtime with 0.04 µA quiescent current and seamless VCC/VBATT handoff at 60 mV hysteresis. |
Use Scenario: Detects grid failure via unregulated DC bus; initiates meter data flush to FRAM before backup power depletes. IC Role / Device Role / Timing Role: Dual-threshold supervisor: 4.4 V reset + 1.25 V PFI for predictive grid collapse warning. Use Value: Provides ≥15 ms advance warning (via PFO) before VCC crosses reset threshold, enabling full data commit. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM800LARN-REEL | 4.65 V ±2% reset threshold; otherwise identical pinout, timing, and feature set. | Suitable for 5 V +10%/–5% supplies; not compatible with 5 V ±10% rails where low-threshold margin is required. | Select ADM800LARN-REEL only if system VCC tolerance is tighter on the lower side and 4.65 V threshold avoids nuisance resets. |
| MAX693AESA+ | Same 4.4 V reset threshold, but 125 µA standby current in backup mode vs. 0.04 µA; no BATT ON output. | Lacks integrated CE gating and battery status flag; requires external components for RAM write protection and PNP drive. | Choose MAX693AESA+ only if legacy MAX compatibility is mandatory and ultra-low backup current is not critical. |
Compared with ADM800LARN-REEL and MAX693AESA+, the ADM800MARN-REEL uniquely combines 4.4 V reset accuracy, sub-0.1 µA battery backup current, and integrated CEOUT/BATT ON outputs-enabling compact, low-power, and self-contained supervisory designs without external support circuitry.
Availability
ADM800MARN-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, and medical infusion pumps requiring stable component supply, long-term lifecycle assurance, and guaranteed RoHS-compliant sourcing.
Supply support for ADM800MARN-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 robust microprocessor power supervision in harsh environments-delivering precision reset, battery switchover, watchdog, and memory protection in a single IC.
FAQ
What is the reset threshold voltage of the ADM800MARN-REEL and how tightly is it specified?
The ADM800MARN-REEL has a guaranteed reset threshold of 4.25 V minimum and 4.50 V maximum at 25°C, with ±2% tolerance over temperature. This 4.4 V nominal threshold is optimized for 5 V ±10% power supplies, ensuring reliable reset assertion before microprocessor operational limits are exceeded. The specification is validated per Analog Devices' ADM691A/ADM693A/ADM800L/M datasheet Rev. 0, Table I and page 2 specifications.
Does the ADM800MARN-REEL support battery backup switching, and what is its dropout behavior?
Yes, the ADM800MARN-REEL supports automatic battery backup switching between VCC and VBATT. In battery mode, VOUT tracks VBATT with ≤0.3 V dropout at 5–20 mA (depending on VBATT voltage), enabled by a dedicated 7 Ω internal MOSFET. The switchover threshold is VBATT ±0.03 V with 60 mV hysteresis to prevent chatter. This behavior is confirmed in the "BATTERY BACKUP SWITCHING" section of the ADM800MARN-REEL datasheet, page 2.
Can the watchdog timeout period of the ADM800MARN-REEL be adjusted, and how?
Yes, the ADM800MARN-REEL watchdog timeout is configurable: grounding OSC IN selects 100 ms (short period); leaving OSC IN and OSC SEL floating selects 1.6 s (long period); connecting OSC SEL to GND enables external control via capacitor (Twd = 600 × C/47 pF ms) or clock (Twd = 1024/fCLK). These modes are defined in Table II and Figure 18 of the ADM800MARN-REEL datasheet Rev. 0.
What is the function of the dual RESET outputs on the ADM800MARN-REEL?
The ADM800MARN-REEL provides two complementary reset signals: pin 15 (RESET) is an active-low push-pull output, while pin 16 (RESET) is an active-high open-drain output. This eliminates the need for external inverters or level shifters when interfacing with processors requiring either polarity. Both outputs are synchronized and share the same 200 ms timeout, as documented in the "RESET AND WATCHDOG TIMER" section (page 2) and Figure 16.
How does the ADM800MARN-REEL handle chip enable (CE) gating during power faults?
The ADM800MARN-REEL forces CEOUT (pin 12) high whenever VCC falls below the 4.4 V reset threshold-regardless of CEIN (pin 13) state-blocking RAM writes during brownouts. CEOUT follows CEIN only when VCC is valid, with 6–10 ns propagation delay. This CE gating function is integral to data integrity and is detailed in the "CHIP ENABLE GATING" specifications (page 3) and Figure 17 timing diagram.
ADM800MARN-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:
- 4.4V
- 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
ADM800MARN-REEL FAQ
1.How can I place an order for ADM800MARN-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM800MARN-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 ADM800MARN-REEL reliable?
The price and inventory of ADM800MARN-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM800MARN-REEL is usually 5 days.
3.What payment methods are accepted for ADM800MARN-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM800MARN-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM800MARN-REEL?
ADM800MARN-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM800MARN-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 ADM800MARN-REEL?
For technical support, including ADM800MARN-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM800MARN-REEL requirements.
6.How does Aetrix verify that ADM800MARN-REEL is sourced from the original manufacturer or authorized distributors?
All ADM800MARN-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 ADM800MARN-REEL meets industry standards.
7.What is the process for return or replacement of ADM800MARN-REEL?
All ADM800MARN-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM800MARN-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 ADM800MARN-REEL part is unused and in its original packaging.
Return procedure for ADM800MARN-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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