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Analog Devices Inc. ADM800MARN
- Part No.:
- ADM800MARN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM800MARN.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,743
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Product details
Overview
ADM800MARN 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, 100 ms/1.6 s selectable watchdog periods, and supports VCC down to 1 V operation. It is used in industrial controllers and automotive ECUs for reliable power monitoring and RAM protection.
For engineers reviewing the ADM800MARN datasheet, ADM800MARN pinout, ADM800MARN application, or ADM800MARN equivalent, key selection considerations include its 4.4 V reset threshold tolerance, battery switchover hysteresis (60 mV), VCC-to-VOUT on-resistance (0.8–1.2 Ω), low 100 µA standby current, and compatibility with 5 V ±10% supplies.
Technical Context
The ADM800MARN implements a dual-threshold voltage detector (4.4 V nominal, ±2% tolerance) with 15 mV hysteresis and internal 200 ms reset timeout generator. Its battery switchover uses PMOS (VCC→VOUT) and NMOS (VBATT→VOUT) switches with validated 250 mA VCC-source and 10 mA VBATT-source capability.
Watchdog functionality relies on WDI transition detection with configurable timeout via OSC SEL/OSC IN - supporting internal 100 ms/1.6 s modes or external clock/capacitor programming. The CE gating circuit provides 6–10 ns propagation delay and 40–150 Ω ON-resistance between CEIN and CEOUT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.4 V ±2% - matches 5 V ±10% supply tolerance; ensures reset assertion before logic corruption. |
| Reset Timeout | 200 ms typ - holds µP in reset long enough for power and clock stabilization after power-up. |
| VCC-to-VOUT RON | 0.8–1.2 Ω - enables ≤250 mA load at <60 mV dropout; avoids external pass transistor unless needed. |
| Battery Switchover Hysteresis | 60 mV - prevents oscillation during VCC/VBATT crossover near switchover point. |
| Standby Current | 70–100 µA - minimizes system quiescent draw during normal VCC operation. |
| Battery Backup Current | 0.04–1 µA - extends multi-year backup life for CMOS RAM using coin-cell or supercapacitor. |
| WDI Input Threshold | VIL = 0.8 V, VIH = 0.75×VCC - compatible with 3.3 V and 5 V logic families without level-shifting. |
Pinout & Package
ADM800MARN is housed in a 16-pin narrow SOIC (R-16N) package with 1.27 mm pitch, JEDEC MS-012AC compliant, 10.2 mm × 7.5 mm footprint, and moisture sensitivity level 1.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VBATT) | Backup Battery Input | Accepts 2.0–6 V battery or capacitor; internally switched to VOUT when VCC drops below reset threshold. |
| 2 (VOUT) | Switched Power Output | Delivers VCC or VBATT (whichever is higher and valid); drives CMOS RAM bank directly up to 250 mA. |
| 3 (VCC) | Main Supply Input | Operates from 4.5–5.5 V; powers internal circuitry and enables VCC→VOUT switching above reset threshold. |
| 4 (GND) | Ground Reference | Common return for all analog/digital functions; must be low-impedance connection to minimize noise coupling. |
| 5 (BATT ON) | Battery Status Output | Open-drain logic high when VBATT is active on VOUT; drives base of external PNP for >250 mA loads. |
| 6 (LOW LINE) | Power-Fail Indicator | Active-low signal asserted when VCC falls below 4.4 V; used for early brownout warning or NMI triggering. |
| 7 (OSC IN) | Oscillator Control Input | Selects watchdog/reset timing: grounded = 100 ms WD / 200 ms reset; floating = 1.6 s WD / 200 ms reset. |
| 8 (OSC SEL) | Oscillator Mode Select | Low = enable external clock/capacitor timing; floating/high = use internal oscillator (default mode). |
| 9 (PFI) | Power Fail Input | Non-inverting comparator input referenced to 1.25 V; monitors auxiliary supply or divider for early fail detection. |
| 10 (PFO) | Power Fail Output | Active-low open-drain output; asserts when PFI < 1.25 V; typically connected to µP NMI or interrupt 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 | Follows CEIN when VCC > reset threshold; forced high during reset to block RAM writes. |
| 13 (CEIN) | Chip Enable Input | Directly controls CEOUT; tied to GND or VOUT if unused to prevent floating input. |
| 14 (WDO) | Watchdog Status Output | Active-low open-drain flag; remains low until next WDI transition after timeout; indicates software stall. |
| 15 (RESET) | Active-Low Reset Output | Push-pull output; asserts low when VCC < 4.4 V or watchdog times out; holds for 200 ms after recovery. |
| 16 (RESET) | Active-High Reset Output | Open-drain complement of RESET; provides active-high reset signal for processors requiring inverted logic. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Watchdog Timeout | Configurable 100 ms or 1.6 s via OSC IN/OSC SEL pins - enables tuning for real-time response vs. fault tolerance. |
| Integrated CE Gating | 5 ns propagation delay and 40–150 Ω ON-resistance - prevents spurious RAM writes during brownouts without external logic. |
| Low-Dropout Battery Switchover | VCC→VOUT RON = 0.8–1.2 Ω; VBATT→VOUT RON = 12–25 Ω - maintains stable VOUT under load while minimizing backup energy loss. |
| 1.25 V Precision Power-Fail Comparator | ±25 nA input bias, 25 µs response - enables accurate early-warning detection of supply degradation before reset threshold breach. |
| Extended Low-Voltage Operation | Functional down to VCC = 1 V - guarantees reset assertion and hold-through during deep brownouts where other supervisors fail. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Continuous operation in factory-floor environments with fluctuating 5 V rail due to motor switching and EMI. IC Role / Device Role / Timing Role: Supervises 5 V supply, gates RAM write enable during brownouts, triggers NMI on early power fail, and resets µP on sustained undervoltage. Use Value: Prevents corrupted firmware updates and data loss during 10–100 ms dips; 60 mV switchover hysteresis eliminates chatter during marginal VCC transitions. |
Use Scenario: Power management in vehicle door modules exposed to cold-cranking (4.2 V) and load-dump transients. IC Role / Device Role / Timing Role: Monitors 5 V post-regulator rail, enables battery-backed SRAM retention during engine start, and asserts reset if VCC falls below 4.4 V. Use Value: Guarantees µP reset at 4.4 V (not 4.65 V), matching automotive 5 V ±10% spec; 0.04 µA battery current extends 10-year backup life with CR2032. |
| Medical Infusion Pump | Ruggedized Handheld Terminal |
Use Scenario: Life-critical device requiring deterministic reset behavior and nonvolatile memory integrity during AC power loss. IC Role / Device Role / Timing Role: Controls switchover to supercapacitor backup, disables RAM writes via CEOUT during power transition, and signals PFO to save therapy parameters pre-shutdown. Use Value: 200 ms reset hold time ensures full µP initialization; 1.25 V PFI reference allows independent monitoring of unregulated input for predictive shutdown. |
Use Scenario: Field-deployed asset tracker operating on Li-ion battery with periodic wake-up and sensor logging. IC Role / Device Role / Timing Role: Provides watchdog supervision of firmware execution, detects stuck states via WDI, and asserts WDO to trigger safe sleep or error reporting. Use Value: 100 ms short watchdog period catches firmware hangs within 100 ms; WDO open-drain output interfaces directly to µP GPIO without pull-up conflict. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM693AARN | Same 4.4 V reset threshold and 16-pin R-16N package; ±3% reset tolerance vs. ADM800MARN's ±2%. | Higher reset threshold variation may reduce margin in tight 5 V ±5% systems; identical watchdog and battery features. | Choose ADM693AARN only if ±3% tolerance is acceptable and legacy design reuse is prioritized over tighter specification. |
| MAX693AESA+ | Pin-compatible 16-pin SOIC; 4.4 V reset threshold but 150 µA typical supply current vs. ADM800MARN's 100 µA. | Larger quiescent draw reduces battery backup duration; lacks BATT ON output for external PNP drive. | Select MAX693AESA+ only for drop-in replacement where existing layout prohibits redesign and higher standby current is tolerable. |
Compared with ADM693AARN and MAX693AESA+, the ADM800MARN delivers tighter ±2% reset tolerance, lower 100 µA standby current, and integrated BATT ON output for external current boosting - making it optimal for new designs demanding precision, efficiency, and flexibility in battery-backed µP systems.
Availability
ADM800MARN is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and ruggedized handheld terminals requiring stable component supply across extended temperature ranges.
Supply support for ADM800MARN 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 power supervision in microprocessor-based systems - delivering integrated reset, watchdog, battery switchover, and memory protection in a single IC.
FAQ
What is the reset threshold voltage of the ADM800MARN and how tightly is it specified?
The ADM800MARN has a nominal reset threshold of 4.4 V with a guaranteed tolerance of ±2%, meaning the actual trip point falls between 4.312 V and 4.488 V across temperature and supply conditions. This tighter tolerance than the ±3% of ADM693AARN improves design margin in 5 V ±10% systems. The ADM800MARN datasheet specifies min/max values at TA = –40°C to +85°C and VCC = 4.5–5.5 V, confirming this performance is production-validated.
Can the ADM800MARN operate with VCC below 4.5 V, and what happens to reset functionality?
Yes, the ADM800MARN remains fully functional with VCC as low as 1 V. During brownout, RESET stays asserted low until VCC rises above the 4.4 V threshold, then holds low for 200 ms. Below 1 V, internal circuitry shuts down, but the ADM800MARN datasheet confirms reliable reset assertion and hold-through down to 1 V - critical for detecting deep undervoltage events that would disable less robust supervisors.
How does the ADM800MARN handle battery backup switchover, and what is the maximum supported VBATT voltage?
The ADM800MARN automatically switches VOUT from VCC to VBATT when VCC drops below VBATT minus 0.03 V (power-up) or VBATT plus 0.03 V (power-down), with 60 mV hysteresis. VBATT accepts 2.0–6.0 V per absolute maximum ratings, and the internal switch delivers up to 10 mA from VBATT with <1 µA standby current. This allows use with Li-ion cells, coin cells, or supercapacitors without external diodes or regulators.
Is the ADM800MARN watchdog timer configurable, and what are the available timeout options?
Yes, the ADM800MARN watchdog timer supports three configurations: (1) 100 ms short timeout (OSC IN = GND, OSC SEL floating), (2) 1.6 s long timeout (OSC IN and OSC SEL floating), or (3) adjustable timeout via external capacitor or clock on OSC IN. With OSC SEL = GND, a 47 pF capacitor yields 1.6 s WD timeout; scaling linearly allows precise tuning. The ADM800MARN datasheet Table II documents all combinations and timing equations.
Does the ADM800MARN provide both active-low and active-high reset outputs, and how are they electrically implemented?
Yes, the ADM800MARN provides two reset outputs: pin 15 (RESET) is a push-pull active-low output capable of sinking 50 µA at 0.3 V or sourcing 1.6 mA at 3.5 V; pin 16 (RESET) is an open-drain active-high output requiring an external pull-up. This dual-output architecture eliminates need for external inverters when interfacing with µPs requiring either polarity - a feature confirmed in the ADM800MARN functional block diagram and pin descriptions.
ADM800MARN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-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:
- 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 FAQ
1.How can I place an order for ADM800MARN through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM800MARN 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 reliable?
The price and inventory of ADM800MARN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM800MARN is usually 5 days.
3.What payment methods are accepted for ADM800MARN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM800MARN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM800MARN?
ADM800MARN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM800MARN 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?
For technical support, including ADM800MARN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM800MARN requirements.
6.How does Aetrix verify that ADM800MARN is sourced from the original manufacturer or authorized distributors?
All ADM800MARN 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 meets industry standards.
7.What is the process for return or replacement of ADM800MARN?
All ADM800MARN units undergo pre-shipment inspection (PSI). If there is an issue with ADM800MARN, 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 part is unused and in its original packaging.
Return procedure for ADM800MARN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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