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Analog Devices Inc. ADM693AR-REEL
- Part No.:
- ADM693AR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADM693AR-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,120
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Product details
Overview
ADM693AR-REEL from Analog Devices is a 16-pin SOIC microprocessor supervisory circuit with precision 4.4 V reset threshold, adjustable 50 ms/200 ms reset timeout, dual-mode watchdog (100 ms / 1.6 s), automatic battery backup switchover (VBATT 2.0–4.0 V), and CE gating with 5 ns propagation delay - used in industrial controllers to maintain RAM integrity during brownout.
For engineers reviewing the ADM693AR-REEL datasheet, ADM693AR-REEL pinout, ADM693AR-REEL application, or ADM693AR-REEL equivalent, this page delivers verified specifications, validated package mapping, confirmed functional alternatives, and real-world use context for power monitoring, battery-backed memory protection, and watchdog supervision in embedded systems operating from –40°C to +85°C.
Technical Context
The ADM693AR-REEL integrates three independent timing control paths: a voltage-monitoring comparator with 40 mV hysteresis triggering RESET at 4.4 V (min 4.25 V, max 4.48 V), an oscillator-selectable watchdog timer supporting internal 100 ms/1.6 s modes or external capacitor/clock-adjusted timeouts, and a dedicated power-fail comparator with 1.3 V threshold referenced to PFI.
Its battery switchover logic uses 70 mV turn-on and 50 mV turn-off thresholds with 20 mV hysteresis to prevent oscillation near VCC = VBATT; CEIN-to-CEOUT gating remains active down to VCC = 1 V, ensuring write-protection continuity during deep brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.4 V nominal (4.25–4.48 V range); ensures compatibility with ±10% 5 V supplies and reliable assertion before microprocessor malfunction. |
| Reset Timeout | 50 ms typical (adjustable to 200 ms); provides sufficient stabilization time after power-up while minimizing boot latency. |
| Watchdog Modes | 100 ms short period or 1.6 s long period (default post-reset); prevents false triggers during initialization and supports tight-loop supervision. |
| Battery Voltage Range | 2.0–4.0 V; supports common lithium, NiMH, and supercapacitor backup sources without external regulation. |
| VOUT Drive Capability | 100 mA max at ≤0.5 V dropout; powers CMOS RAM directly without external pass transistor under normal operation. |
| CE Gating Delay | 5 ns typical; enables real-time chip-enable blanking during supply transients to prevent spurious writes to memory. |
| Supply Current (Active) | 1.95 mA max at 100 mA load; enables low-power system design with minimal impact on main rail. |
| Standby Current (Battery Mode) | 1 µA max; extends backup runtime for months in sleep-critical applications like data loggers. |
Pinout & Package
ADM693AR-REEL is housed in a 16-lead SOIC (R-16) package with 1.27 mm pitch, JEDEC MS-012AC compliant, and rated for industrial temperature (–40°C to +85°C).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Common return for all analog and digital functions; must be low-impedance connection to minimize noise coupling into reset comparator. |
| VBATT | Backup battery input | Accepts 2.0–4.0 V source; internally compared against VCC to enable seamless switchover without external diodes or FETs. |
| VOUT | Switched output | Delivers VCC or VBATT (whichever higher) to RAM; capable of 100 mA continuous current with <0.5 V dropout at full load. |
| PFI | Power fail input | Non-inverting comparator input referenced to 1.3 V; used to monitor regulated/unregulated rails for early warning prior to reset assertion. |
| PFO | Power fail output | Active-low open-drain signal; asserts when PFI < 1.3 V, typically routed to µP NMI to initiate graceful shutdown. |
| WDO | Watchdog output | Active-low status flag indicating watchdog timeout; resets on next WDI transition, enabling diagnostic logging of software hangs. |
| VCC | Main supply input | 4.5–5.5 V nominal; powers internal circuitry and enables VOUT switching; RESET remains valid down to 1 V. |
| RESET | Active-low reset output | Drives microprocessor reset pin directly; guaranteed low until VCC > 4.4 V + hysteresis, then holds low for 50 ms (or adjusted period). |
| BATT ON | Battery active indicator | Active-high open-drain output; sinks 35 mA to drive base of external PNP transistor for >100 mA VOUT extension. |
| LOW LINE | Low-voltage indicator | Active-low signal asserting immediately when VCC drops below reset threshold; used for real-time supply monitoring. |
| OSC IN | Oscillator input | Accepts external clock (0–250 kHz) or 47 pF capacitor to adjust reset/watchdog timing; disabled when OSC SEL = high. |
| OSC SEL | Oscillator mode select | Internal 3 µA pull-up; floating/high selects internal oscillator; low enables external timing source for programmable timeouts. |
| RESET | Active-high reset output | Inverted complement of RESET; provided for processors requiring active-high reset assertion without external inverter. |
| CEIN | Chip enable input | Logic input gated to CEOUT; tied to GND if unused; monitored only when VCC ≥ reset threshold. |
| CEOUT | Gated chip enable output | Buffered CEIN replica with 5 ns delay; forced high during brownout to block writes to battery-backed RAM. |
| WDI | Watchdog input | Three-level input (low/mid/high); transitions reset watchdog timer; floating or mid-supply disables watchdog function. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset timeout | Configurable via OSC SEL/OSC IN to 50 ms or 200 ms, enabling optimization between fast boot and robust power stabilization. |
| Dual-mode watchdog timer | Hardware-selectable 100 ms or 1.6 s timeout with automatic 1.6 s post-reset default, preventing premature timeout during firmware initialization. |
| True battery switchover hysteresis | 70 mV turn-on / 50 mV turn-off differential ensures stable VOUT sourcing without oscillation during slow VCC decay near VBATT. |
| Sub-1 V reset validity | RESET output remains asserted and functional down to VCC = 1 V, guaranteeing controlled shutdown even during severe brownout. |
| Integrated CE gating | 5 ns propagation delay with automatic high-force during undervoltage, eliminating need for external logic to protect RAM write cycles. |
| Low-quiescent battery standby | 0.6–1 µA supply current in battery-backup mode, extending shelf life of coin-cell or supercapacitor backup sources. |
Applications
| Industrial PLC Controller | Automotive Telematics Module |
|---|---|
Use Scenario: Maintains volatile configuration data in SRAM during engine cranking-induced 5 V rail sag (down to 3.2 V for 100 ms). IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, battery-backed RAM switchover, and watchdog supervision. Use Value: Prevents corrupted firmware state by holding µP in reset until VCC recovers above 4.4 V, while preserving RAM contents via VBATT switchover. |
Use Scenario: Powers GPS/Bluetooth memory during vehicle ignition cycle where main 5 V supply dips below 4.5 V for up to 200 ms. IC Role / Device Role / Timing Role: Microprocessor supervisor with adjustable 200 ms reset timeout and 1.6 s watchdog, synchronized to ignition timing. Use Value: Enables deterministic boot sequence by delaying reset release until post-cranking stability, avoiding race conditions in modem initialization. |
| Medical Data Logger | Smart Energy Meter |
Use Scenario: Preserves patient measurement history in battery-backed SRAM during AC mains interruption lasting 5–30 seconds. IC Role / Device Role / Timing Role: Power management IC performing VCC monitoring, VBATT switchover, and CE gating to lock memory writes. Use Value: Guarantees zero data loss by forcing CEOUT high within 5 ns of VCC drop, blocking all write operations before supply collapse. |
Use Scenario: Monitors 5 V DC-DC output in utility meter during grid instability; triggers EEPROM save before power failure. IC Role / Device Role / Timing Role: System supervisor using PFI/PFO to detect pre-failure voltage droop and assert NMI interrupt 10–15 ms before RESET. Use Value: Provides 15 ms advance warning via PFO to complete critical metering register saves to nonvolatile memory before blackout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX693AESA+ | 4.40 V reset threshold, 16-pin SOIC, but fixed 50 ms reset timeout and no adjustable watchdog; lacks CEIN/CEOUT pins. | Suitable for basic reset-only designs without memory write protection or programmable timing. | Select MAX693AESA+ only if CE gating and adjustable timeouts are unnecessary and footprint compatibility is required. |
| TPS3823-44DBVR | 4.4 V reset threshold, SOT-23-5, no battery switchover, no watchdog, no CE gating; ultra-low 12 µA quiescent current. | Fits space-constrained applications needing only voltage monitoring and reset, not full supervisory functionality. | Choose TPS3823-44DBVR only for minimal reset supervision where battery backup, watchdog, and memory protection are omitted. |
Compared with MAX693AESA+ and TPS3823-44DBVR, the ADM693AR-REEL uniquely integrates battery switchover, dual-mode watchdog, and 5 ns CE gating in a single 16-pin SOIC - making it the only option among the three that fully satisfies requirements for RAM-integrity-critical industrial controllers.
Availability
ADM693AR-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive telematics modules, medical data loggers, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM693AR-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, founded in 1965 and headquartered in Wilmington, MA.
The ADM690–ADM695 family was designed specifically for microprocessor system supervision - integrating reset generation, battery backup control, watchdog timing, and memory write protection into single-chip solutions for industrial, automotive, and instrumentation applications.
FAQ
What is the exact reset voltage threshold specification for ADM693AR-REEL?
The ADM693AR-REEL has a guaranteed reset voltage threshold of 4.25 V minimum, 4.4 V typical, and 4.48 V maximum over temperature. This 4.4 V nominal threshold is optimized for compatibility with ±10% 5 V power supplies and ensures reliable reset assertion before microprocessor operational failure occurs. The 40 mV hysteresis prevents chatter during slow VCC recovery.
Does ADM693AR-REEL support adjustable reset timeout, and how is it configured?
Yes, ADM693AR-REEL supports adjustable reset timeout (50 ms or 200 ms) via the OSC SEL and OSC IN pins. With OSC SEL floating or high, connecting OSC IN low selects 50 ms; leaving OSC IN floating selects 200 ms. With OSC SEL low, an external capacitor on OSC IN allows proportional adjustment (e.g., 260 ms × C/47 pF). This configurability is documented in Table I of the ADM693AR-REEL datasheet.
Can ADM693AR-REEL drive more than 100 mA on VOUT, and if so, how?
Yes, ADM693AR-REEL can drive >100 mA on VOUT by adding an external PNP pass transistor. The BATT ON output (pin 9) directly drives the base of the PNP device, enabling extended current capability beyond the internal 100 mA PMOS switch. This configuration is shown in Figure 17 of the ADM693AR-REEL datasheet and maintains low dropout voltage while scaling output current.
What is the battery voltage range supported by ADM693AR-REEL, and why does it differ from ADM691/ADM695?
ADM693AR-REEL supports VBATT from 2.0 V to 4.0 V, whereas ADM691/ADM695 support up to 4.25 V. This difference arises from process and design optimizations specific to the ADM693 variant's internal comparator and switchover circuitry, as confirmed in the "VBATT Operating Voltage Range" table of the ADM693AR-REEL datasheet. It ensures safe operation with common 3.6 V lithium and 3.3 V rechargeable cells.
How does the CE gating function of ADM693AR-REEL protect memory during brownout?
The CE gating in ADM693AR-REEL forces CEOUT high within nanoseconds of VCC falling below the 4.4 V reset threshold - regardless of CEIN state - thereby disabling chip enable to battery-backed RAM and preventing spurious writes. With a guaranteed 5 ns propagation delay and operation down to VCC = 1 V, ADM693AR-REEL ensures memory integrity even during rapid, deep brownout events.
ADM693AR-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:
- 4.4V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ADM693AR-REEL FAQ
1.How can I place an order for ADM693AR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM693AR-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 ADM693AR-REEL reliable?
The price and inventory of ADM693AR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM693AR-REEL is usually 5 days.
3.What payment methods are accepted for ADM693AR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM693AR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM693AR-REEL?
ADM693AR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM693AR-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 ADM693AR-REEL?
For technical support, including ADM693AR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM693AR-REEL requirements.
6.How does Aetrix verify that ADM693AR-REEL is sourced from the original manufacturer or authorized distributors?
All ADM693AR-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 ADM693AR-REEL meets industry standards.
7.What is the process for return or replacement of ADM693AR-REEL?
All ADM693AR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM693AR-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 ADM693AR-REEL part is unused and in its original packaging.
Return procedure for ADM693AR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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