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Analog Devices Inc. ADM691AARNZ-REEL7
- Part No.:
- ADM691AARNZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM691AARNZ-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
ADM691AARNZ-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, 0.75 Ω VCC-to-VOUT on-resistance, and operates with VCC as low as 1 V. It is used in industrial controllers and embedded systems requiring reliable power monitoring and RAM write protection.
For engineers reviewing the ADM691AARNZ-REEL7 datasheet, ADM691AARNZ-REEL7 pinout, ADM691AARNZ-REEL7 application, or ADM691AARNZ-REEL7 equivalent, key selection criteria include reset voltage accuracy (±3%), battery switchover hysteresis (60 mV), CEOUT propagation delay (6–10 ns), PFI comparator threshold (1.25 V), and TSSOP-16 package compatibility with space-constrained PCB layouts.
Technical Context
The ADM691AARNZ-REEL7 implements a dual-voltage switchover architecture using internal PMOS (VCC→VOUT) and NMOS (VBATT→VOUT) switches, enabling seamless transition between main supply and backup battery at VCC as low as 1 V. Its reset generator uses an internal oscillator with fixed 200 ms timeout or external capacitor/clock adjustment.
Watchdog functionality relies on WDI transition detection with configurable long (1.6 s) or short (100 ms) timeout periods; the first timeout after reset defaults to 1.6 s to accommodate processor initialization. The PFI comparator compares input voltage against a precision 1.25 V reference, driving PFO low within 25–60 µs of threshold crossing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±3% - ensures reliable reset assertion for +5 V supplies with –5%/+10% tolerance. |
| Reset Timeout | 200 ms typ (adjustable) - holds µP in reset long enough for power and clock stabilization. |
| VCC-to-VOUT RON | 0.75 Ω typ - limits dropout to ≤188 mV at 250 mA, supporting high-current RAM backup. |
| Watchdog Timeout | 1.6 s (long) or 100 ms (short) - configurable via OSC SEL/OSC IN for flexible software supervision. |
| PFI Threshold | 1.25 V - enables early power-fail warning by sensing auxiliary rails or unregulated inputs. |
| Battery Standby Current | 0.04 µA typ - extends backup battery life for multi-year CMOS RAM retention. |
| CEOUT Propagation Delay | 6–10 ns - ensures precise timing alignment between CEIN and CEOUT for synchronous memory access. |
Pinout & Package
ADM691AARNZ-REEL7 is housed in a 16-lead TSSOP (RU-16) package, 5.0 mm × 4.4 mm × 1.2 mm, lead pitch 0.65 mm, moisture sensitivity level 1. Pin functions are validated per Analog Devices datasheet Rev. 0.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Backup battery input | Connects to Li-ion or supercapacitor; enables automatic switchover when VCC drops below reset threshold. |
| 2 VOUT | Switched output rail | Delivers VCC or VBATT to RAM; supports 250 mA from VCC or 10 mA from VBATT with <0.3 V dropout. |
| 3 VCC | Main +5 V supply input | Power source for internal logic; monitored for reset generation down to 1 V operation. |
| 4 GND | Ground reference | Common return for all analog/digital circuits; required for accurate voltage threshold detection. |
| 5 BATT ON | Battery switchover status output | Active-high signal indicating VBATT is active on VOUT; drives external PNP base for >250 mA loads. |
| 6 LOW LINE | VCC undervoltage indicator | Asserts low immediately when VCC falls below 4.65 V; used for real-time brownout notification. |
| 7 OSC IN | Oscillator control input | Selects reset/watchdog timing: grounded = 100 ms WD, floating = 1.6 s WD, capacitor-driven = adjustable. |
| 8 OSC SEL | Oscillator mode select | High/floating = internal oscillator; low = external clock or capacitor timing source. |
| 9 PFI | Power fail input | Non-inverting comparator input referenced to 1.25 V; accepts divided-down system rail for early warning. |
| 10 PFO | Power fail output | Open-drain output asserting low when PFI < 1.25 V; typically connected to µP NMI for data save interrupt. |
| 11 WDI | Watchdog input | Three-level input (low/mid/high); reset triggered if no transition occurs within timeout period. |
| 12 CEOUT | Gated chip enable output | Replicates CEIN when VCC is valid; forced high during reset to block RAM writes during power instability. |
| 13 CEIN | Chip enable input | Accepts µP CE/CS signal; gated internally to prevent memory corruption during brownouts. |
| 14 WDO | Watchdog status output | Active-low open-drain output signaling WD timeout; resets high on next WDI transition. |
| 15 RESET | Active-low reset output | Drives µP reset pin; guaranteed low until 200 ms after VCC exceeds 4.65 V. |
| 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-defined periods via external capacitor (COSC) or clock, enabling design flexibility across applications. |
| Low-power battery backup mode | Draws only 0.04 µA from VBATT when VCC is absent, extending 3 V coin-cell life to >10 years for CMOS RAM retention. |
| Integrated CE gating logic | Forces CEOUT high during reset or brownout, preventing erroneous writes to battery-backed RAM without external logic. |
| 1.25 V precision PFI comparator | Enables early power-fail detection with 25 µs response time, allowing µP to execute safe shutdown before VCC collapse. |
| VCC-operational down to 1 V | Maintains functional reset assertion and battery switchover even as main supply decays to 1 V, ensuring robust shutdown sequencing. |
Applications
| Industrial PLCs | Automotive Body Control Modules |
|---|---|
Use Scenario: Power monitoring and nonvolatile memory protection in programmable logic controllers exposed to wide temperature and voltage fluctuations. IC Role / Device Role / Timing Role: Supervisory IC providing reset hold-off, battery-backed RAM switchover, and watchdog supervision during engine cranking or load dump events. Use Value: Prevents firmware corruption during 12 V battery dips to 6 V by maintaining RESET assertion and switching to backup supply before VCC falls below 4.65 V. |
Use Scenario: Ensuring deterministic startup and fault recovery in vehicle body electronics managing door locks, lighting, and sensors. IC Role / Device Role / Timing Role: Dual-role supervisor generating timed reset pulses and detecting pre-failure conditions on 5 V regulated rail. Use Value: Uses PFI to monitor unregulated 12 V input via resistor divider, triggering PFO interrupt 15 ms before VCC drops below reset threshold-enabling EEPROM save before power loss. |
| Medical Diagnostic Equipment | Network Edge Routers |
Use Scenario: Safeguarding configuration memory and calibration data in portable ultrasound or patient monitors during AC power interruption. IC Role / Device Role / Timing Role: Battery switchover controller and watchdog timer ensuring continuous RAM retention and software health monitoring during mains failure. Use Value: Delivers 250 mA from VCC or 10 mA from VBATT to SRAM bank with <0.25 V dropout, preserving critical state during 200 ms backup window. |
Use Scenario: Maintaining packet buffer integrity and management CPU reset integrity in carrier-grade edge routers with redundant power supplies. IC Role / Device Role / Timing Role: System-level supervisor coordinating CEOUT-driven memory write blocking, PFO-triggered graceful shutdown, and WDI-monitored firmware liveness. Use Value: CEOUT propagation delay <10 ns ensures synchronous write disable with µP address/data bus timing, eliminating race conditions during brownout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691ACPE+ | Pin-compatible DIP-16; 4.65 V reset threshold; no TSSOP option; higher 150 µA quiescent current vs. 100 µA typ for ADM691A. | Legacy through-hole designs; lacks RU-16 footprint for modern SMT layouts. | Select MAX691ACPE+ only for existing DIP-based repair or prototyping where board rework is impractical. |
| TPS3823MPW | Single-supply 3.3 V/5 V operation; 4.63 V reset threshold; 200 ms fixed timeout; no battery switchover or CE gating. | Cost-sensitive 5 V-only systems without backup RAM requirements. | Choose TPS3823MPW when battery backup, CE control, and watchdog are unnecessary-reducing BOM count and layout area. |
Compared with MAX691ACPE+, ADM691AARNZ-REEL7 offers lower standby current and TSSOP packaging for density-critical designs; versus TPS3823MPW, it delivers full battery switchover, CE gating, and watchdog-making it suitable for systems requiring comprehensive power integrity beyond basic reset.
Availability
ADM691AARNZ-REEL7 is available at Aetrix Electronics and suitable for industrial PLCs, automotive body control modules, medical diagnostic equipment, and network edge routers requiring stable component supply, long-term lifecycle support, and RoHS-compliant TSSOP packaging.
Supply support for ADM691AARNZ-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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADM691AARNZ-REEL7 belongs to Analog Devices' microprocessor supervisory circuit family, designed specifically for robust power monitoring, battery-backed memory protection, and watchdog supervision in mission-critical embedded systems.
FAQ
What is the reset voltage threshold accuracy of the ADM691AARNZ-REEL7?
The ADM691AARNZ-REEL7 has a guaranteed reset voltage threshold of 4.65 V with ±3% tolerance over temperature and supply variations. This corresponds to a minimum of 4.50 V and maximum of 4.75 V, making it compatible with +5 V supplies having –5%/+10% regulation tolerance. The specification is validated per Analog Devices datasheet Rev. 0, Table I and page 2 specifications.
Does the ADM691AARNZ-REEL7 support adjustable watchdog timeout periods?
Yes, the ADM691AARNZ-REEL7 supports adjustable watchdog timeout periods via the OSC SEL and OSC IN pins. With OSC SEL grounded, connecting a capacitor (COSC) from OSC IN to GND sets the timeout to Twd = 600 × (C/47 pF) ms. An external clock applied to OSC IN yields Twd = 1024 × (1/fCLK) seconds. These configurations are detailed in Table II and Figure 18c/d of the ADM691A datasheet.
How does the ADM691AARNZ-REEL7 handle battery switchover during power failure?
The ADM691AARNZ-REEL7 automatically switches VOUT from VCC to VBATT when VCC drops below VBATT − 0.03 V (power-up) or VBATT + 0.03 V (power-down), with 60 mV hysteresis. In battery mode, VOUT is sourced through a 7 Ω switch with dropout <0.15 V at 5 mA, and supply current drops to 0.04 µA. This behavior is confirmed in the "Battery Backup Switching" section (page 2) and Table III of the datasheet.
Can the ADM691AARNZ-REEL7 drive external transistors for higher VOUT current?
Yes, the ADM691AARNZ-REEL7's BATT ON output is designed to drive the base of an external PNP transistor for loads exceeding 250 mA. When VBATT powers VOUT, BATT ON goes high, enabling base current flow through an external resistor. Figure 21 in the datasheet shows this configuration, and the BATT ON sink capability (60 mA short-circuit) supports robust transistor turn-on under worst-case conditions.
What is the function of the dual RESET outputs on the ADM691AARNZ-REEL7?
The ADM691AARNZ-REEL7 provides two complementary reset outputs: pin 15 (RESET) is active-low open-drain, and pin 16 (RESET) is active-high open-drain. This allows direct interface with microprocessors requiring either polarity without external inverters. Both outputs are synchronized and share the same 200 ms timeout; pin 16 is explicitly described as "the inverse of RESET" on page 5 of the datasheet.
ADM691AARNZ-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:
- Active
- 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
ADM691AARNZ-REEL7 FAQ
1.How can I place an order for ADM691AARNZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM691AARNZ-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 ADM691AARNZ-REEL7 reliable?
The price and inventory of ADM691AARNZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM691AARNZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM691AARNZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM691AARNZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM691AARNZ-REEL7?
ADM691AARNZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM691AARNZ-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 ADM691AARNZ-REEL7?
For technical support, including ADM691AARNZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM691AARNZ-REEL7 requirements.
6.How does Aetrix verify that ADM691AARNZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM691AARNZ-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 ADM691AARNZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM691AARNZ-REEL7?
All ADM691AARNZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM691AARNZ-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 ADM691AARNZ-REEL7 part is unused and in its original packaging.
Return procedure for ADM691AARNZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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