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Analog Devices Inc. ADM693AARNZ-REEL
- Part No.:
- ADM693AARNZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM693AARNZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,936
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Product details
Overview
ADM693AARNZ-REEL from Analog Devices is a microprocessor supervisory circuit integrating precision 4.4 V reset threshold, 200 ms reset timeout, 1.6 s watchdog timer, battery backup switchover (VCC/VBATT), and chip enable gating - all in a 16-pin narrow SOIC package. It monitors +5 V power rails in embedded controllers and automotive ECUs, holding RESET low during brownout and ensuring RAM write protection via CEOUT.
For engineers reviewing the ADM693AARNZ-REEL datasheet, ADM693AARNZ-REEL pinout, ADM693AARNZ-REEL application, or ADM693AARNZ-REEL equivalent, key selection criteria include its 4.4 V ±3% reset threshold compatibility with 5 V ±10% supplies, 0.75 Ω VCC-to-VOUT on-resistance at 25 mA, and guaranteed operation down to VCC = 1 V - critical for fail-safe microprocessor startup and shutdown sequencing.
Technical Context
The ADM693AARNZ-REEL implements a dual-threshold voltage detector (4.4 V reset, 1.25 V PFI) with 15 mV hysteresis, an internal oscillator selectable between 100 ms and 1.6 s watchdog periods, and a PMOS-based battery switchover circuit that transitions at VBATT ±0.03 V with 60 mV hysteresis. Its CE gating logic forces CEOUT high when VCC drops below reset threshold, independent of CEIN state.
RESET is an active-low push-pull output with 0.1 V max low-level voltage at 3.2 mA sink, while the complementary open-drain RESET provides active-high reset capability. The WDO output asserts low on watchdog timeout and remains latched until next WDI transition, supporting deterministic fault recovery in safety-critical firmware.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40 V ±3% - matches 5 V ±10% supply tolerance; ensures reliable reset assertion before microprocessor malfunction. |
| Reset Timeout | 200 ms typ - holds processor in reset long enough for power and clock stabilization after VCC rise. |
| VCC–VOUT On-Resistance | 0.75 Ω typ at 25 mA - limits dropout to ≤18.75 mV, enabling direct CMOS RAM powering without external LDO. |
| Battery Switchover Threshold | VBATT ±0.03 V - precise transition point minimizes voltage glitch during VCC failure; 60 mV hysteresis prevents chatter. |
| Supply Current (Normal) | 100 µA max - enables integration into low-power industrial sensors and battery-backed data loggers. |
| Watchdog Timeout (Long) | 1.6 s - provides sufficient margin for complex boot sequences while detecting stalled firmware loops. |
| PFI Threshold | 1.25 V - allows early power-fail warning via resistor divider; supports NMI-triggered data save before VCC collapse. |
Pinout & Package
ADM693AARNZ-REEL is housed in a 16-pin narrow SOIC (R-16N) package with 1.27 mm pitch, JEDEC MS-012AC compliant, and rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Backup battery input | Connects to 2.0–6 V battery/capacitor; enables seamless switchover when VCC fails. |
| 2 VOUT | Switched output | Delivers VCC or VBATT (whichever is higher and valid); powers RAM or low-power logic up to 250 mA. |
| 3 VCC | Main supply input | +4.5 V to +5.5 V primary rail; monitored for reset generation and CE gating control. |
| 5 BATT ON | Battery status indicator | Active-high signal indicating VBATT is active on VOUT; drives base of external PNP for >250 mA loads. |
| 6 LOW LINE | Power-fail flag | Asserts low when VCC < 4.4 V; used for immediate system alert or interrupt signaling. |
| 7 OSC IN | Oscillator input | Selects watchdog/reset timing: grounded = 100 ms short period; floating = 1.6 s long period. |
| 8 OSC SEL | Oscillator mode select | Floating/high = internal oscillator; grounded = external clock/capacitor timing control. |
| 9 PFI | Power-fail comparator input | Non-inverting input referenced to 1.25 V; accepts voltage divider for early power-loss detection. |
| 10 PFO | Power-fail output | Active-low open-drain output; triggers NMI or initiates controlled shutdown sequence. |
| 11 WDI | Watchdog input | Three-level input (low/mid/high); reset triggered if no transition occurs within timeout window. |
| 12 CEOUT | Gated chip-enable output | Replicates CEIN when VCC is valid; forced high during reset to block RAM writes. |
| 13 CEIN | Chip-enable input | Accepts microprocessor CE/CS signal; gated internally to prevent invalid memory access. |
| 14 WDO | Watchdog status output | Active-low latched output; indicates watchdog timeout occurred and requires WDI toggle to clear. |
| 15 RESET | Active-low reset output | Push-pull driver; asserts low during power-up, brownout, or watchdog fault; 200 ms minimum pulse width. |
| 16 RESET | Active-high reset output | Open-drain complement of RESET; pulls high via external resistor for processors requiring active-high reset. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed operation down to VCC = 1 V | Ensures RESET remains asserted through deep brownout, preventing partial execution during unstable supply conditions. |
| Automatic battery switchover with 60 mV hysteresis | Eliminates output glitches during VCC/VBATT crossover; maintains uninterrupted VOUT supply to RAM. |
| Programmable watchdog timeout (100 ms / 1.6 s) | Supports both fast-recovery systems and complex boot firmware without requiring external timing components. |
| Integrated CE gating with 5 ns propagation delay | Prevents spurious RAM writes during power transitions by forcing CEOUT high within 12 µs of VCC drop. |
| 1.25 V precision PFI reference with 25 nA input bias | Enables high-impedance voltage divider design for accurate early power-fail detection with minimal loading. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Monitors 5 V system rail in programmable logic controller during factory power fluctuations and ESD events. IC Role / Device Role / Timing Role: Supervisory IC providing reset assertion, RAM write protection, and early power-fail warning via PFO-triggered NMI. Use Value: Prevents corrupted ladder logic execution and preserves configuration EEPROM during 100 ms–2 s brownouts. |
Use Scenario: Embedded in door module ECU with backup supercapacitor to retain window position memory during ignition-off. IC Role / Device Role / Timing Role: Battery switchover controller and watchdog supervisor ensuring safe shutdown and fault recovery. Use Value: Enables 72-hour memory retention using 0.1 F supercap with <1 µA battery standby current. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Secures volatile RAM storing dosage history and calibration data during AC mains interruption. IC Role / Device Role / Timing Role: Dual-role supervisor: generates 200 ms reset pulse and gates CE to prevent write errors during power sag. Use Value: Meets IEC 62304 Class C software safety requirements via deterministic watchdog timeout and fail-safe reset behavior. |
Use Scenario: Monitors isolated 5 V DC-DC output in utility meter; detects grid collapse before backup battery engages. IC Role / Device Role / Timing Role: Precision voltage monitor with 1.25 V PFI comparator feeding MCU's ADC for predictive power-loss logging. Use Value: Extends time-to-safe-shutdown by 15–25 ms versus discrete comparator solutions, preserving last kWh reading. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX693CPE+ | 4.40 V reset threshold, 200 ms timeout, but lacks integrated CE gating and has higher 250 µA supply current. | Requires external logic for RAM write protection; less suitable for space-constrained designs needing CEOUT functionality. | Choose MAX693CPE+ only if legacy pin compatibility with Maxim-based designs is required and CE gating is implemented externally. |
| TPS3823MPW | 4.38 V reset threshold, 200 ms timeout, 1.25 V PFI, but no battery switchover or watchdog timer. | Cannot replace ADM693AARNZ-REEL in battery-backed RAM systems; limited to basic reset-only applications. | Use TPS3823MPW where cost sensitivity outweighs need for watchdog/battery features and system uses separate backup management. |
Compared with MAX693CPE+ and TPS3823MPW, the ADM693AARNZ-REEL delivers full supervisory integration - combining reset, watchdog, battery switchover, CE gating, and PFI in one SOIC - reducing BOM count by ≥4 discrete components and eliminating layout risk from external timing networks.
Availability
ADM693AARNZ-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 production lifecycles.
Supply support for ADM693AARNZ-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 ADM693AARNZ-REEL belongs to Analog Devices' microprocessor supervisory circuit family, designed specifically for robust power monitoring and fault recovery in mission-critical embedded systems where data integrity and deterministic reset behavior are mandatory.
FAQ
What is the exact reset voltage threshold of the ADM693AARNZ-REEL?
The ADM693AARNZ-REEL has a guaranteed reset voltage threshold of 4.25 V minimum, 4.40 V typical, and 4.50 V maximum at +25°C, with ±3% tolerance over temperature. This 4.4 V nominal threshold ensures compatibility with 5 V ±10% power supplies and distinguishes it from the 4.65 V ADM691A variant.
Does the ADM693AARNZ-REEL support external capacitor-based timing adjustment?
Yes - when OSC SEL is grounded, the ADM693AARNZ-REEL accepts an external capacitor from OSC IN to GND to set adjustable timing: reset active period = 1200 × (C/47 pF) ms and watchdog timeout = 600 × (C/47 pF) ms. A 47 pF capacitor yields 200 ms reset and 1.6 s watchdog, matching default behavior.
How does the ADM693AARNZ-REEL handle battery switchover during VCC brownout?
The ADM693AARNZ-REEL uses a comparator with 60 mV hysteresis to switch VOUT from VCC to VBATT when VCC falls below VBATT − 0.03 V. During switchover, VOUT remains stable within 0.15 V of VBATT at 5 mA load, and supply current drops to 0.04 µA typical in battery-backup mode.
Can the ADM693AARNZ-REEL drive CMOS RAM directly without external transistors?
Yes - the ADM693AARNZ-REEL's VOUT pin delivers up to 250 mA with 0.75 Ω on-resistance, enabling direct connection to standard CMOS RAM banks. For loads exceeding 250 mA or lower dropout, the BATT ON output can drive an external PNP transistor as shown in Figure 21 of the datasheet.
What is the function of the dual RESET outputs on the ADM693AARNZ-REEL?
The ADM693AARNZ-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 allows direct interface with both active-low and active-high reset-input microprocessors without level-shifting circuitry.
ADM693AARNZ-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:
- 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:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ADM693AARNZ-REEL FAQ
1.How can I place an order for ADM693AARNZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM693AARNZ-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 ADM693AARNZ-REEL reliable?
The price and inventory of ADM693AARNZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM693AARNZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM693AARNZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM693AARNZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM693AARNZ-REEL?
ADM693AARNZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM693AARNZ-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 ADM693AARNZ-REEL?
For technical support, including ADM693AARNZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM693AARNZ-REEL requirements.
6.How does Aetrix verify that ADM693AARNZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM693AARNZ-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 ADM693AARNZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM693AARNZ-REEL?
All ADM693AARNZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM693AARNZ-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 ADM693AARNZ-REEL part is unused and in its original packaging.
Return procedure for ADM693AARNZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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