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Analog Devices Inc. ADM695AR-REEL
- Part No.:
- ADM695AR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADM695AR-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,561
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Product details
Overview
ADM695AR-REEL from Analog Devices is a 16-pin SOIC microprocessor supervisory circuit with adjustable reset timeout (200 ms typ.), 4.65 V precision reset threshold, 100 mA VOUT battery-switched power output, watchdog timer (100 ms / 1.6 s / adjustable), and CE gating with 5 ns propagation delay. It serves as a complete power-monitoring and backup-control solution in industrial embedded systems requiring reliable brownout detection and RAM write protection.
For engineers reviewing the ADM695AR-REEL datasheet, ADM695AR-REEL pinout, ADM695AR-REEL application, or ADM695AR-REEL equivalent, key selection criteria include its adjustable reset/watchdog timing, dual-mode oscillator (internal/external), battery switchover hysteresis (20 mV), low 600 nA standby current, and integrated CEIN/CEOUT gating for CMOS RAM write protection - all validated for –40°C to +85°C operation.
Technical Context
The ADM695AR-REEL implements a dual-threshold voltage monitor (4.65 V reset, 1.3 V PFI) with 40 mV hysteresis, enabling robust brownout detection down to 1 V VCC. Its internal PMOS switch delivers up to 100 mA at VOUT with ≤0.5 V dropout under full load, while the 20 Ω backup MOSFET ensures minimal voltage loss during battery switchover.
It integrates three independent timing functions: a user-adjustable reset pulse generator (via OSC SEL/OSC IN), a configurable watchdog timer (100 ms short / 1.6 s long / external clock or capacitor), and a fast CE gating path (5 ns delay) that forces CEOUT high during reset to prevent invalid memory writes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V (guaranteed 4.5–4.73 V); holds µP in reset until stable 5 V ±5% supply is confirmed. |
| Reset Timeout | 200 ms typical (adjustable via OSC IN); provides sufficient stabilization time for slow-starting µPs and peripherals. |
| VOUT Drive Capability | 100 mA continuous; powers CMOS RAM banks without external pass transistor. |
| Battery Switchover Hysteresis | 20 mV; prevents oscillation during slow VCC decay near VBATT voltage. |
| Standby Current | 600 nA (typ.); enables multi-year operation on coin-cell backup without significant drain. |
| CE Gating Delay | 5 ns max; ensures real-time disable of memory writes during power faults. |
| Watchdog Timeout Options | 100 ms, 1.6 s, or externally adjustable; supports both fast-response safety checks and long-cycle firmware validation. |
Pinout & Package
ADM695AR-REEL is housed in a 16-lead SOIC (R-16) package, RoHS-compliant, with 1.27 mm pitch and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Common return for all analog/digital functions; must be low-impedance connection to system ground plane. |
| VBATT | Backup battery input | Accepts 2.0–4.25 V rechargeable or primary cells; sources current only during VCC failure. |
| VOUT | Switched power output | Delivers VCC or VBATT (whichever higher) to RAM; rated for 100 mA continuous load. |
| PFI | Power fail comparator input | Non-inverting input referenced to 1.3 V; used to detect early supply droop before reset threshold is breached. |
| PFO | Power fail comparator output | Active-low interrupt signal to µP; asserts ~ms before VCC drops below 4.65 V. |
| WDO | Watchdog status output | Active-low flag indicating watchdog timeout; resets on next WDI transition. |
| VCC | Main supply input | Operates from 4.75–5.5 V; RESET remains functional down to 1 V for safe shutdown. |
| RESET | Active-low reset output | Drives µP reset pin directly; includes 3 µA internal pull-up; guaranteed low at VCC ≤ 1 V. |
| BATT ON | Battery switchover status | Active-high open-drain output; sinks 35 mA; drives base of external PNP for >100 mA VOUT extension. |
| LOW LINE | Low-VCC indicator | Active-low signal asserting immediately when VCC falls below reset threshold; no delay. |
| OSC IN | Oscillator control input | Accepts external clock (0–250 kHz) or 47 pF capacitor to set reset/watchdog timing. |
| OSC SEL | Oscillator mode select | High/floating = internal oscillator; low = external clock/capacitor mode; 5 µA internal pull-up. |
| RESET (active high) | Complementary reset output | Inverted version of RESET; required by µPs needing active-high reset assertion. |
| CEIN | Chip enable input | Logic input gated to CEOUT; forced high during reset to block memory writes. |
| CEOUT | Gated chip enable output | Buffered CEIN with 5 ns delay; drives RAM CE/WE pins; held high during fault conditions. |
| WDI | Watchdog input | Three-level input (low/mid/high); toggling required within timeout period to prevent reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset & watchdog timing | Configurable via OSC SEL/OSC IN to match system boot sequence and firmware loop timing. |
| Integrated CE gating with 5 ns delay | Prevents spurious RAM writes during power transients without adding external logic or delay elements. |
| 100 mA VOUT with <0.5 V dropout | Eliminates need for external pass transistor in most battery-backed RAM applications. |
| 600 nA battery standby current | Extends coin-cell life beyond 10 years in always-on monitoring applications. |
| 20 mV battery switchover hysteresis | Ensures clean, bounce-free transition between main and backup supplies during marginal VCC conditions. |
Applications
| Industrial PLC Controller | Automotive Telematics Module |
|---|---|
Use Scenario: Maintains SRAM integrity during engine cranking-induced 5 V rail collapse (down to 3.2 V for 100 ms). IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, battery switchover, and watchdog supervision. Use Value: Prevents corrupted configuration data and ensures deterministic restart after voltage recovery. |
Use Scenario: Powers GPS/Bluetooth memory during ignition-off battery-saver mode with 12 V → 5 V converter dropout. IC Role / Device Role / Timing Role: Backup power manager and watchdog enforcer for infotainment subsystem. Use Value: Guarantees 10+ year backup runtime on CR2032 and eliminates firmware lockup without host intervention. |
| Medical Patient Monitor | Smart Energy Meter |
Use Scenario: Preserves calibration and alarm history in volatile RAM during AC mains interruption or battery swap. IC Role / Device Role / Timing Role: Power-fail warning and controlled shutdown supervisor with PFO-triggered NMI. Use Value: Enables safe save-to-EEPROM within 5 ms of PFO assertion, meeting IEC 60601-1 data retention requirements. |
Use Scenario: Secures metering registers and tariff tables during utility grid flicker events (<50 ms dips). IC Role / Device Role / Timing Role: Dual-threshold supervisor (4.65 V reset + 1.3 V PFI) with adjustable watchdog. Use Value: Delivers EN 50470-3 compliant tamper-proof data retention and anti-tamper logging capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX695CSA+ | Fixed 200 ms reset, no adjustable watchdog; 1.6 s only; no CE gating; 8-pin SOIC. | Lacks RAM write protection and flexible timing; suitable only for basic reset-only designs. | Select if cost-sensitive and CE gating/timing adjustability are unnecessary. |
| TPS3823MPW | Single 3.08 V reset threshold; no battery switchover; no watchdog; no CE gating; 5-pin SOT-23. | Designed for simple power-good monitoring only; cannot replace ADM695AR-REEL's full feature set. | Choose only for non-battery-backed, single-rail 3.3 V systems requiring minimal supervision. |
Compared with MAX695CSA+ and TPS3823MPW, the ADM695AR-REEL uniquely combines adjustable reset/watchdog timing, integrated CE gating, and dual-supply battery switchover - making it the only option among the three capable of full RAM data integrity management in 5 V industrial systems.
Availability
ADM695AR-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive telematics modules, medical patient monitors, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM695AR-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 ADM690–ADM695 family was designed specifically for microprocessor system reliability - integrating reset generation, battery backup control, watchdog supervision, and memory write protection into a single IC to eliminate discrete supervision circuits.
FAQ
What is the guaranteed reset voltage threshold range for ADM695AR-REEL?
The ADM695AR-REEL has a guaranteed reset voltage threshold of 4.5 V to 4.73 V at +25°C, with typical value 4.65 V. This range ensures compatibility with 5 V ±5% power supplies and guarantees reliable reset assertion during brownout conditions across the full –40°C to +85°C operating range. The 40 mV hysteresis prevents chatter near the threshold.
Can ADM695AR-REEL drive more than 100 mA at VOUT?
Yes - the ADM695AR-REEL supports >100 mA VOUT loads using an external PNP transistor. Its BATT ON output (capable of sinking 35 mA) directly drives the base of an external PNP, enabling VOUT currents exceeding 500 mA while maintaining low dropout. The internal 100 mA PMOS switch remains active in parallel, sharing current and reducing thermal stress.
How does the watchdog timer behave immediately after power-on reset?
After power-on reset, the ADM695AR-REEL watchdog timer defaults to the 1.6 s timeout period regardless of OSC IN state - giving firmware time to initialize before enforcement begins. Only after the first WDI transition does the selected timeout (100 ms or adjustable) become active. This prevents false resets during boot sequences.
Is ADM695AR-REEL compatible with 3.3 V microprocessors?
No - the ADM695AR-REEL is specified for 4.75–5.5 V VCC operation and generates reset based on a 4.65 V threshold. It is not designed for direct use with 3.3 V systems. For 3.3 V supervision, consider the ADM699 or TPS3809 family; interfacing ADM695AR-REEL with 3.3 V logic requires level-shifting on RESET, WDO, and CEOUT outputs.
What happens to CEOUT when VCC drops below the reset threshold?
When VCC falls below the 4.65 V reset threshold, the ADM695AR-REEL forces CEOUT high (logic 1) regardless of CEIN state - instantly disabling memory writes to protect data integrity. This action occurs with ≤5 ns delay and remains asserted until VCC rises above threshold and the 200 ms reset timeout expires, ensuring no spurious writes during power recovery.
ADM695AR-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm 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
ADM695AR-REEL FAQ
1.How can I place an order for ADM695AR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM695AR-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 ADM695AR-REEL reliable?
The price and inventory of ADM695AR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM695AR-REEL is usually 5 days.
3.What payment methods are accepted for ADM695AR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM695AR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM695AR-REEL?
ADM695AR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM695AR-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 ADM695AR-REEL?
For technical support, including ADM695AR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM695AR-REEL requirements.
6.How does Aetrix verify that ADM695AR-REEL is sourced from the original manufacturer or authorized distributors?
All ADM695AR-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 ADM695AR-REEL meets industry standards.
7.What is the process for return or replacement of ADM695AR-REEL?
All ADM695AR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM695AR-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 ADM695AR-REEL part is unused and in its original packaging.
Return procedure for ADM695AR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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