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Analog Devices Inc. ADM693ARZ-REEL
- Part No.:
- ADM693ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADM693ARZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:706
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Product details
Overview
ADM693ARZ-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, 100 ms/1.6 s watchdog timer, automatic battery backup switchover (VCC/VBATT), and integrated CE gating for RAM write protection. It operates across –40°C to +85°C and supports VCC down to 1 V during reset assertion.
For engineers reviewing the ADM693ARZ-REEL datasheet, ADM693ARZ-REEL pinout, ADM693ARZ-REEL application, or ADM693ARZ-REEL equivalent, this device delivers verified low-power supervision (600 nA standby), fast 5 ns CE propagation delay, and dual-mode oscillator configuration (internal or external) for deterministic reset and watchdog timing in safety-critical embedded systems.
Technical Context
The ADM693ARZ-REEL implements a dual-threshold voltage monitor: one for reset (4.4 V ±0.15 V) with 40 mV hysteresis, and another for power fail detection (1.3 V ±0.05 V). Its battery switchover circuit uses internal PMOS/NMOS switches with 70 mV turn-on and 50 mV turn-off thresholds, enabling seamless transition between VCC and VBATT (2.0–4.0 V) without external components.
It integrates three independent timing domains: a factory-trimmed internal oscillator (10.24 kHz nominal), an external clock input (0–250 kHz), and a programmable capacitor-based oscillator (COSC = 47 pF → 4 kHz). These feed both the reset generator and watchdog timer, allowing independent adjustment of reset pulse width and watchdog timeout via OSC SEL and OSC IN pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.4 V (min 4.25 V, max 4.48 V); ensures reliable reset assertion for 5 V ±10% supplies. |
| Reset Timeout | 50 ms (typical) or adjustable up to 200 ms; guarantees sufficient microprocessor stabilization time after power-up. |
| Watchdog Timeout | 100 ms (short) or 1.6 s (long), selectable via OSC IN; prevents indefinite loop lockup with configurable response latency. |
| VOUT Drive Capability | 100 mA (VCC mode), 250 µA (battery mode); powers CMOS RAM directly without external pass transistor. |
| Standby Current | 600 nA (typical); enables multi-year operation on coin-cell backup without significant drain. |
| CE Propagation Delay | 5 ns (max 9 ns); provides near-instantaneous chip enable gating during brownout to prevent memory corruption. |
| Operating Temperature | –40°C to +85°C; qualified for industrial-grade embedded control and automotive body electronics. |
Pinout & Package
ADM693ARZ-REEL is housed in a 16-lead SOIC (R-16) package with 1.27 mm pitch, JEDEC MS-012AC compliant, and RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance connection to system ground plane. |
| VBATT | Backup battery input | Accepts 2.0–4.0 V rechargeable or primary cells; internally compared against VCC to trigger switchover. |
| VOUT | Switched output supply | Delivers VCC or VBATT (whichever higher) to RAM; rated for 100 mA continuous, 1 V minimum dropout at full load. |
| PFI | Power fail input | Noninverting comparator input referenced to 1.3 V; used to sense early power rail collapse before reset threshold is crossed. |
| PFO | Power fail output | Active-low open-drain signal; asserts when PFI < 1.3 V, enabling microprocessor NMI or controlled shutdown sequence. |
| WDO | Watchdog output | Active-low status flag indicating watchdog timeout; resets on next WDI transition, enabling software diagnostics. |
| VCC | Main supply input | 4.5–5.5 V nominal; powers internal logic and drives VOUT in normal mode; reset remains active down to 1 V. |
| RESET | Active-low reset output | Guaranteed low during brownout, power-down, or watchdog timeout; drives standard CMOS inputs directly. |
| BATT ON | Battery switchover 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 complementary signal to RESET; returns high immediately upon VCC recovery above threshold. |
| OSC IN | Oscillator input/control | Accepts external clock (0–250 kHz) or 47 pF capacitor to set precise reset/watchdog timing; overrides internal oscillator when OSC SEL = low. |
| OSC SEL | Oscillator select | Internal 3 µA pull-up; floating/high selects internal oscillator; low enables external timing source for full configurability. |
| RESET | Active-high reset output | Inverted complement of RESET pin; provided for processors requiring active-high reset assertion (e.g., ARM Cortex-M series). |
| CEIN | Chip enable input | Logic input gated by VCC health; when VCC drops below reset threshold, CEOUT is forced high regardless of CEIN state. |
| CEOUT | Gated chip enable output | 5 ns propagation delay replica of CEIN during valid VCC; prevents RAM writes during unstable supply conditions. |
| WDI | Watchdog input | Three-level input (low/mid/high); toggling required within timeout period; floating or mid-supply disables watchdog function. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset timeout | Configurable 50 ms or 200 ms pulse width via OSC SEL/OSC IN, enabling optimization for fast-boot vs. slow-ramp power supplies. |
| Dual-mode watchdog timer | Factory-set 100 ms/1.6 s selection with automatic long-period first-cycle behavior post-reset, eliminating boot-time false triggers. |
| Integrated CE gating | 5 ns propagation delay ensures RAM write protection activates before supply collapse reaches critical levels. |
| Low-dropout battery switchover | 1.5 Ω on-resistance in VCC mode and 20 Ω in VBATT mode minimize voltage loss, preserving RAM retention voltage margin. |
| Power fail warning comparator | 1.3 V reference with <1 µs response time enables preemptive data save operations 5–10 ms before reset assertion. |
| Ultra-low standby current | 600 nA typical in battery-backup mode extends 3 V coin-cell life beyond 10 years for infrequently powered systems. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Real-time I/O monitoring and fault logging in programmable logic controllers with nonvolatile RAM backup. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, battery-backed RAM power switching, and watchdog-triggered safe state entry. Use Value: Guarantees deterministic reset at 4.4 V threshold and maintains RAM integrity during 100 ms–2 s power interruptions using internal 100 mA VOUT driver. |
Use Scenario: Central body controller managing door locks, lighting, and window motors with EEPROM configuration storage. IC Role / Device Role / Timing Role: Power supervisor with PFI/PFO interface to main 12 V regulator and CEOUT-driven EEPROM write protection. Use Value: Uses 1.3 V PFI comparator to detect pre-failure voltage sag on 5 V LDO, triggering EEPROM store 8 ms before reset-preventing configuration corruption. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Battery-powered infusion pump retaining dosage history and calibration data during AC power loss. IC Role / Device Role / Timing Role: Dual-supply supervisor asserting RESET and forcing CEOUT high to freeze RAM writes while switching to Li-MnO₂ backup cell. Use Value: 600 nA standby current enables >5 year shelf life on 120 mAh coin cell; BATT ON output drives external PNP for 500 mA peak RAM refresh current. |
Use Scenario: Revenue-grade meter with tamper-detection logging and time-of-use tariff storage during grid outages. IC Role / Device Role / Timing Role: High-reliability supervisor with adjustable 200 ms reset timeout to accommodate slow-ramping supercapacitor backup. Use Value: OSC IN capacitor configuration allows precise 200 ms reset pulse synchronized to supercap charging curve, avoiding premature MCU reset. |
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, 200 ms fixed reset timeout, no adjustable watchdog, 16-pin SOIC package. | Lacks OSC IN/OSC SEL configurability; suitable only where fixed timing suffices and CE gating not required. | Select MAX693AESA+ only if design requires pin compatibility with legacy Maxim designs and does not need programmable timing. |
| TPS3823MPW | 4.38 V reset threshold, 200 ms fixed timeout, no battery switchover, no CE gating, 8-pin TSSOP package. | Single-supply only; no VBATT support or RAM write protection; intended for simpler reset-only use cases. | Choose TPS3823MPW only for cost-sensitive, space-constrained applications lacking battery backup or memory protection requirements. |
Compared with ADM693ARZ-REEL, MAX693AESA+ offers identical reset threshold and package but omits oscillator configurability and CE gating, while TPS3823MPW reduces footprint and cost at the expense of battery management and memory safety features-making ADM693ARZ-REEL the sole choice for full-featured industrial supervision.
Availability
ADM693ARZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for ADM693ARZ-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 supervision-integrating reset generation, battery backup, watchdog monitoring, and memory protection into a single IC to eliminate discrete supervision circuits in space-constrained embedded designs.
FAQ
What is the guaranteed reset voltage threshold range for ADM693ARZ-REEL?
The ADM693ARZ-REEL has a guaranteed reset voltage threshold range of 4.25 V (minimum) to 4.48 V (maximum) at +25°C, with 40 mV hysteresis. This specification ensures reliable reset assertion for 5 V ±10% power supplies and remains stable over the full –40°C to +85°C operating temperature range. The ADM693ARZ-REEL's threshold is distinct from the 4.65 V variants (e.g., ADM691) and is optimized for tighter-tolerance 5 V rails.
How does ADM693ARZ-REEL handle battery switchover during power transitions?
The ADM693ARZ-REEL uses internal comparators to monitor the differential between VCC and VBATT, initiating switchover when VCC falls 70 mV below VBATT (power-down) or rises 50 mV above VBATT (power-up), with 20 mV hysteresis to prevent chatter. In battery mode, VOUT connects to VBATT through a 20 Ω switch, delivering up to 250 µA at <50 mV dropout. The ADM693ARZ-REEL maintains RESET assertion down to 1 V VCC during transition, ensuring uninterrupted microprocessor hold.
Can ADM693ARZ-REEL generate both active-high and active-low reset signals simultaneously?
Yes, the ADM693ARZ-REEL provides two dedicated reset outputs: RESET (active-low) and RESET (active-high), both asserted synchronously during brownout, power-down, or watchdog timeout. The active-high RESET output is the logical inverse of RESET and is designed to interface directly with processors requiring high-asserted reset (e.g., certain ARM, Renesas, and Microchip MCUs). Both outputs drive CMOS loads without external pull-ups due to internal 3 µA pull-up on RESET.
What is the maximum continuous current ADM693ARZ-REEL can deliver from VOUT in normal operation?
The ADM693ARZ-REEL delivers up to 100 mA continuously from VOUT when powered by VCC, with a typical VOUT–VCC dropout of 25 mV at 1 mA and ≤500 mV at 100 mA. This capability eliminates the need for external pass transistors in most CMOS RAM applications. For loads exceeding 100 mA, the BATT ON output can directly drive the base of an external PNP transistor, extending VOUT current capacity while maintaining low dropout-verified in ADM693ARZ-REEL application circuit Figure 17.
How does the watchdog timer behave immediately after power-up on ADM693ARZ-REEL?
Upon initial power-up, the ADM693ARZ-REEL defaults to the "long" watchdog timeout period (1.6 s) regardless of OSC IN state, giving the microprocessor sufficient time to initialize peripherals and configure I/O before the first watchdog service is required. After the first valid WDI transition (high-to-low or low-to-high), the timer switches to the selected "short" period (100 ms) if configured. If WDI remains static beyond the active timeout, RESET and WDO assert low-behavior confirmed in ADM693ARZ-REEL functional description and timing diagram Figure 3.
ADM693ARZ-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:
- Active
- 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
ADM693ARZ-REEL FAQ
1.How can I place an order for ADM693ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM693ARZ-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 ADM693ARZ-REEL reliable?
The price and inventory of ADM693ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM693ARZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM693ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM693ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM693ARZ-REEL?
ADM693ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM693ARZ-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 ADM693ARZ-REEL?
For technical support, including ADM693ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM693ARZ-REEL requirements.
6.How does Aetrix verify that ADM693ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM693ARZ-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 ADM693ARZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM693ARZ-REEL?
All ADM693ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM693ARZ-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 ADM693ARZ-REEL part is unused and in its original packaging.
Return procedure for ADM693ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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