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Analog Devices Inc. ADM691AARN-REEL7
- Part No.:
- ADM691AARN-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM691AARN-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,925
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Product details
Overview
ADM691AARN-REEL7 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 4.65 V ±3% reset threshold, 200 ms or adjustable reset timeout, 1.6 s/100 ms selectable watchdog timeout, and supports VCC down to 1 V operation. It is used in industrial controllers and automotive ECUs requiring reliable brownout recovery and RAM write protection.
For engineers reviewing the ADM691AARN-REEL7 datasheet, ADM691AARN-REEL7 pinout, ADM691AARN-REEL7 application, or ADM691AARN-REEL7 equivalent, key selection criteria include reset voltage accuracy, battery switchover hysteresis (60 mV), CEOUT propagation delay (6–10 ns), low standby current (70–100 µA), and compatibility with 5 V ±5% supplies.
Technical Context
The ADM691AARN-REEL7 implements a dual-threshold voltage detector (4.65 V reset, 1.25 V PFI reference), an internal oscillator with selectable timing modes (200 ms reset / 1.6 s watchdog default), and a bidirectional PMOS/NMOS switchover architecture enabling seamless VCC-to-VBATT transition at <1 V VCC. Its CE gating logic forces CEOUT high during reset, independent of CEIN state.
It integrates a three-level WDI input (logic low/high/floating), a dedicated BATT ON open-drain output for external PNP base drive, and a power-fail comparator with 25 µs response. All digital outputs (RESET, WDO, PFO, LOW LINE) are push-pull or open-drain with defined sink/source specs per load condition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±3% - ensures reliable reset assertion for 5 V ±5% supplies without false triggering. |
| Reset Timeout | 200 ms typ - holds µP in reset long enough for power supply and clock stabilization after power-up. |
| Battery Switchover Hysteresis | 60 mV - prevents oscillation during VCC/VBATT crossover near switchover point. |
| VCC to VOUT On-Resistance | 0.8–1.2 Ω @ 25 mA - limits dropout to <30 mV under typical RAM load, preserving voltage margin. |
| Supply Current (Normal) | 70–100 µA - enables low-power operation in always-on monitoring applications. |
| Watchdog Timeout (Long) | 1.6 s - provides sufficient software execution window before reset, configurable via OSC SEL/OSC IN. |
| PFI Input Threshold | 1.25 V - allows precise early-warning detection of +5 V rail collapse using external resistor divider. |
Pinout & Package
ADM691AARN-REEL7 is housed in a 16-pin narrow SOIC (R-16N) package, 7.5 mm × 10.3 mm body, 1.27 mm pitch, RoHS-compliant, tape-and-reel delivery (REEL7).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Backup Battery Input | Accepts 2.0–6 V backup source; internally switched to VOUT when VCC drops below reset threshold. |
| 2 VOUT | Switched Output Rail | Delivers VCC (up to 250 mA) or VBATT (up to 10 mA) to CMOS RAM; dropout <0.3 V at full load. |
| 3 VCC | Main Power Supply Input | Operates from 4.75–5.5 V; supervisory functions remain active down to 1 V. |
| 4 GND | Ground Reference | Common return for all analog/digital circuits; critical for accurate voltage threshold sensing. |
| 5 BATT ON | Battery Active Indicator | Open-drain output pulled high when VBATT powers VOUT; drives external PNP base directly. |
| 6 LOW LINE | Low-VCC Alert | Push-pull output goes low immediately on VCC drop below 4.65 V; no delay for fast fault signaling. |
| 7 OSC IN | Oscillator Timing Control | Accepts external capacitor (for adjustable timeout) or clock signal (for precise timing control). |
| 8 OSC SEL | Oscillator Mode Select | High/floating = internal oscillator; low = external clock/capacitor mode; 10 µA internal pullup. |
| 9 PFI | Power-Fail Input | Non-inverting comparator input referenced to 1.25 V; detects pre-failure voltage sag on auxiliary rails. |
| 10 PFO | Power-Fail Output | Active-low interrupt output with 25 µs response; triggers NMI or data-save routines before shutdown. |
| 11 WDI | Watchdog Input | Three-state input (low/high/floating); reset triggered if no edge occurs within 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 connected to µP CE/CS line; gated through internal logic to prevent invalid memory access. |
| 14 WDO | Watchdog Status Output | Active-low status flag; remains low until first WDI edge after timeout, enabling diagnostic logging. |
| 15 RESET | Active-Low Reset Output | Push-pull output; asserts low on VCC undervoltage and holds for 200 ms post-recovery. |
| 16 RESET | Active-High Reset Output | Complementary open-drain output; provides active-high reset for processors requiring inverted logic. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset & Watchdog Timing | Supports fixed (200 ms / 1.6 s) or user-configurable timeouts via external capacitor or clock - enables design flexibility across platforms. |
| Low-VCC Operation Down to 1 V | Maintains functional reset assertion and battery switchover even as VCC collapses - guarantees safe shutdown in brownout conditions. |
| Integrated CE Gating Logic | Forces CEOUT high during reset regardless of CEIN state - eliminates risk of corrupted RAM writes during power transitions. |
| 0.04 µA Battery Backup Current | Minimizes drain on backup batteries or supercapacitors during extended offline periods - extends backup runtime significantly. |
| 1.25 V Precision PFI Reference | Enables accurate early-warning detection of power rail degradation using simple resistor dividers - improves system fault tolerance. |
Applications
| Industrial PLC Controller | Automotive Body Control Module |
|---|---|
Use Scenario: Continuous operation in factory-floor environments with fluctuating 5 V supplies and frequent brownouts. IC Role / Device Role / Timing Role: Supervisory IC providing reset hold, RAM write protection, and watchdog supervision for ARM Cortex-M4 MCU. Use Value: Prevents firmware corruption during 100–200 ms line sags by holding RESET active and blocking CEOUT, ensuring deterministic restart. |
Use Scenario: Power management in vehicle door modules exposed to cold-crank (4.5 V) and load-dump (18 V) transients. IC Role / Device Role / Timing Role: Voltage monitor and battery switchover controller for EEPROM-backed configuration storage during ignition-off. Use Value: Seamless VBATT takeover at 60 mV hysteresis avoids glitching; 0.04 µA backup current extends 3 V coin-cell life to >10 years. |
| Medical Infusion Pump | Telecom Remote Terminal Unit |
Use Scenario: Life-critical device requiring fail-safe power sequencing and data integrity during AC loss. IC Role / Device Role / Timing Role: Dual-role supervisor: generates NMI via PFO for immediate data save, then asserts RESET after 200 ms. Use Value: 25 µs PFI→PFO delay ensures NMI fires before VCC crosses reset threshold - captures last valid sensor readings. |
Use Scenario: Outdoor cabinet-mounted RTU operating unattended for months with solar/battery backup. IC Role / Device Role / Timing Role: Low-power supervisor managing 5 V rail, RAM retention, and watchdog health check over 4G modem interface. Use Value: 70 µA quiescent current minimizes daytime solar charge consumption; WDO output feeds modem reset pin for autonomous recovery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691ACPE+ | Same pinout, 4.65 V reset, but higher 120 µA supply current and no adjustable watchdog timeout. | Lacks OSC SEL/OSC IN configurability - fixed 1.6 s watchdog only; less suitable for variable-software-loop designs. | Select MAX691ACPE+ only if legacy footprint compatibility is mandatory and timing flexibility is unnecessary. |
| TPS3823-46DBVR | 4.63 V reset threshold, 200 ms timeout, but no battery switchover, CE gating, or PFI comparator. | Single-function reset IC - requires external components for RAM protection and power-fail warning, increasing BOM count. | Choose TPS3823-46DBVR only for cost-sensitive, non-battery-backed systems where full ADM691AARN-REEL7 feature set is unused. |
Compared with MAX691ACPE+, ADM691AARN-REEL7 offers lower quiescent current and field-programmable timing; compared with TPS3823-46DBVR, it integrates battery switchover and CE gating - eliminating four external components and reducing PCB area by ≥12 mm².
Availability
ADM691AARN-REEL7 is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive body control modules, medical infusion pumps, and telecom remote terminal units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM691AARN-REEL7 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 family was designed specifically for robust microprocessor supervision in harsh environments - delivering integrated reset, watchdog, battery switchover, and power-fail warning in a single SOIC package.
FAQ
What is the guaranteed reset voltage threshold tolerance for ADM691AARN-REEL7?
The ADM691AARN-REEL7 has a guaranteed reset voltage threshold of 4.65 V with ±3% tolerance (4.50 V to 4.75 V), validated across –40°C to +85°C. This ensures compatibility with 5 V ±5% power supplies while preventing spurious resets during nominal operation. The specification is tested per Analog Devices' ADM691A/ADM693A/ADM800L/M Rev. 0 datasheet, Table "Reset Voltage Threshold".
Can ADM691AARN-REEL7 operate with VCC below 4.75 V?
Yes, ADM691AARN-REEL7 remains fully functional down to VCC = 1 V, including reset generation, battery switchover, and watchdog monitoring. Below 4.75 V, the reset output stays asserted until VCC rises above 4.65 V, and the internal circuitry continues monitoring VBATT. This behavior is explicitly documented in the "GENERAL DESCRIPTION" and "ABSOLUTE MAXIMUM RATINGS" sections of the datasheet.
How does the CEOUT pin behave during a power-down event?
During power-down, when VCC falls below the 4.65 V reset threshold, ADM691AARN-REEL7 forces CEOUT high regardless of CEIN state - blocking all RAM write operations. This action begins within 800 ns of VCC crossing the threshold (per "LOW LINE to RESET Delay") and persists for the full 200 ms reset timeout. CEOUT returns to tracking CEIN only after VCC stabilizes above threshold and reset deasserts.
What is the maximum continuous current ADM691AARN-REEL7 can deliver from VOUT when powered by VCC?
ADM691AARN-REEL7 delivers up to 250 mA continuously from VOUT when sourced by VCC, with a typical VCC-to-VOUT on-resistance of 0.75 Ω. At 250 mA, the voltage drop is ≤0.3 V (per "VCC to VOUT Output Resistance" spec). For loads exceeding 250 mA, the BATT ON output can drive an external PNP transistor to augment current capacity - a method validated in Figure 21 of the datasheet.
Is ADM691AARN-REEL7 pin-compatible with MAX691A variants?
Yes, ADM691AARN-REEL7 is functionally and pin-compatible with MAX691A in 16-pin narrow SOIC (R-16N) packages, sharing identical pinout, electrical characteristics, and timing behavior. However, ADM691AARN-REEL7 offers improved specifications: lower supply current (70–100 µA vs. 120 µA), tighter reset threshold tolerance (±3% vs. ±4%), and enhanced battery switchover hysteresis (60 mV vs. unspecified in MAX691A).
ADM691AARN-REEL7 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:
- 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
ADM691AARN-REEL7 FAQ
1.How can I place an order for ADM691AARN-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM691AARN-REEL7 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 ADM691AARN-REEL7 reliable?
The price and inventory of ADM691AARN-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM691AARN-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM691AARN-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM691AARN-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM691AARN-REEL7?
ADM691AARN-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM691AARN-REEL7 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 ADM691AARN-REEL7?
For technical support, including ADM691AARN-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM691AARN-REEL7 requirements.
6.How does Aetrix verify that ADM691AARN-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM691AARN-REEL7 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 ADM691AARN-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM691AARN-REEL7?
All ADM691AARN-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM691AARN-REEL7, 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 ADM691AARN-REEL7 part is unused and in its original packaging.
Return procedure for ADM691AARN-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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