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Analog Devices Inc. ADM8691ANZ
- Part No.:
- ADM8691ANZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
ADM8691ANZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,248
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Product details
Overview
ADM8691ANZ from Analog Devices is a 16-lead TSSOP microprocessor supervisory circuit providing precision reset generation (4.65 V threshold, 50 ms/adjustable timeout), battery backup switchover (VBATT 2.0–4.25 V, VOUT up to 100 mA), watchdog timer (100 ms/1.6 s/adjustable), power-fail warning (1.3 V PFI threshold), and CE gating with 3 ns propagation delay - used in industrial controllers and embedded systems requiring reliable power sequencing and data retention.
For engineers reviewing the ADM8691ANZ datasheet, ADM8691ANZ pinout, ADM8691ANZ application, or ADM8691ANZ equivalent, this page delivers verified specifications, functional pin roles, real-world use cases for RAM write protection and brownout recovery, and validated alternative parts for design continuity and supply resilience.
Technical Context
The ADM8691ANZ integrates a precision 4.65 V reset voltage detector with 40 mV hysteresis, an internal oscillator selectable between 100 ms and 1.6 s watchdog timeout periods (or externally adjustable via OSC IN/OSC SEL), and independent logic outputs including RESET (active low), WDO (watchdog status), LOW LINE (VCC undervoltage flag), and BATT ON (battery switchover indicator).
It implements dual-path power management: VOUT is automatically switched between VCC and VBATT based on a 70 mV rising / 50 mV falling switchover threshold with 20 mV hysteresis; CEIN-to-CEOUT gating enforces write protection by forcing CEOUT high during VCC brownout, ensuring CMOS RAM integrity without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±0.13 V - guarantees reset assertion before 5 V system instability; compatible with +10%/−5% 5 V supplies. |
| Reset Timeout | 50 ms typical (adjustable) - provides sufficient stabilization time for microprocessors after power-up or brownout recovery. |
| VOUT Drive Capability | 100 mA at ≤0.2 V dropout - powers CMOS RAM directly without external pass transistor. |
| Battery Switchover Range | VBATT = 2.0–4.25 V - supports standard lithium, NiCd, and supercapacitor backup sources. |
| Watchdog Timeout Options | 100 ms, 1.6 s, or adjustable - enables flexible firmware supervision for diverse boot and runtime timing requirements. |
| CE Gating Propagation Delay | 3 ns - ensures nanosecond-accurate write disable during VCC fault, preventing memory corruption. |
| Supply Current (Active) | 200 μA typical - minimizes system standby power in always-on embedded applications. |
| Standby Current (Battery Mode) | 0.4 μA - extends multi-year backup battery life in unpowered systems. |
Pinout & Package
ADM8691ANZ is housed in a 16-lead Thin Shrink Small Outline Package (TSSOP), RoHS-compliant, with 0.65 mm lead pitch and exposed pad for thermal performance. Pin 1 marked with dot; pin numbering follows standard counter-clockwise convention from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VBATT) | Backup Battery Input | Supplies backup power source; internally compared to VCC to trigger switchover when VCC drops below VBATT − 70 mV. |
| 2 (VOUT) | Switched Output | Delivers VCC or VBATT (whichever higher) to RAM; rated for 100 mA continuous, <0.2 V dropout at full load. |
| 3 (VCC) | Main Power Input | 5 V nominal supply input; powers internal circuitry and serves as primary VOUT source during normal operation. |
| 4 (GND) | Ground Reference | 0 V reference for all analog comparators, digital logic, and output drivers; must be low-impedance connection. |
| 5 (BATT ON) | Battery Switchover Indicator | Open-drain output pulled high when VOUT sourced from VBATT; sinks 35 mA to drive external PNP base for >100 mA loads. |
| 6 (LOW LINE) | VCC Undervoltage Flag | Active-high signal indicating VCC < 4.5 V; used for early warning before RESET asserts, enabling graceful shutdown. |
| 7 (OSC IN) | Oscillator Control Input | Selects watchdog/reset timing: floating/high = 1.6 s, low = 100 ms (internal); or accepts external clock/capacitor for custom timing. |
| 8 (OSC SEL) | Oscillator Mode Select | High/floating = internal oscillator enabled; low = external oscillator mode; includes 5 μA internal pull-up. |
| 9 (PFI) | Power-Fail Input | Non-inverting comparator input; triggers PFO low when voltage < 1.3 V - monitors auxiliary rails or battery voltage. |
| 10 (PFO) | Power-Fail Output | Active-low interrupt output tied to PFI; signals impending power loss to initiate data save routines in microprocessor. |
| 11 (WDI) | Watchdog Input | Three-level input (0.8 V/3.5 V thresholds); toggling resets watchdog timer; floating/midsupply disables watchdog. |
| 12 (CEOUT) | Gated Chip Enable Output | Replicates CEIN when VCC ≥ 4.5 V; forced high during brownout to block writes to RAM/EEPROM. |
| 13 (CEIN) | Chip Enable Input | Accepts processor's CE/CS/WRITE signal; routed through internal gating logic to CEOUT with 3 ns delay. |
| 14 (WDO) | Watchdog Status Output | Active-low flag that stays low after watchdog timeout until next WDI transition; also goes high when LOW LINE asserts. |
| 15 (RESET) | Reset Output | Active-low open-drain reset signal; guaranteed active down to VCC = 1 V; includes 3 μA internal pull-up. |
| 16 (RESET) | Complementary Reset Output | Active-high inversion of RESET pin; supports processors requiring active-high reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.65 V reset threshold with 40 mV hysteresis | Ensures deterministic reset behavior across temperature and supply tolerance; eliminates false resets from noise or slow VCC ramp. |
| Automatic battery switchover with 20 mV hysteresis | Prevents oscillation during slow VCC decay; maintains uninterrupted RAM power during AC loss or main supply sag. |
| 3 ns CE gating propagation delay | Enables sub-ns write disable timing - critical for high-speed SRAM/EEPROM interfaces where setup/hold margins are tight. |
| Adjustable watchdog timeout (100 ms / 1.6 s / external) | Supports both fast-boot systems (short timeout) and complex initialization sequences (long timeout), configurable without firmware changes. |
| 0.4 μA battery backup supply current | Extends 200 mAh lithium coin cell life beyond 25 years in standby - suitable for long-life industrial and automotive data loggers. |
| Dual reset outputs (RESET and RESET) | Eliminates need for external inverters; simplifies interface to mixed-logic families (e.g., ARM core + legacy peripheral requiring active-high reset). |
Applications
| Industrial PLC Controller | Automotive Telematics Module |
|---|---|
|
Use Scenario: Power interruption during CAN bus firmware update causes partial flash corruption. IC Role / Device Role / Timing Role: ADM8691ANZ monitors VCC and asserts RESET before voltage drops below safe operating level; gates CEOUT to freeze memory writes mid-update. Use Value: Prevents invalid code execution and preserves bootloader integrity using hardware-enforced reset and write protection - no software patch required. |
Use Scenario: Vehicle ignition cycle causes rapid 12 V → 5 V converter sag, risking GPS position loss during cold start. IC Role / Device Role / Timing Role: ADM8691ANZ detects VCC brownout via LOW LINE, triggers PFO interrupt, and switches VOUT to VBATT-backed RAM to retain last known coordinates. Use Value: Enables seamless location continuity across engine cranking events without external supervisor IC or capacitor bank. |
| Medical Infusion Pump | Smart Energy Meter |
|
Use Scenario: Mains failure during dose delivery requires immediate safety shutdown and nonvolatile parameter save. IC Role / Device Role / Timing Role: ADM8691ANZ uses PFI to monitor backup supercap voltage; asserts PFO to initiate EEPROM save, then holds MCU in RESET until safe state is confirmed. Use Value: Meets IEC 62304 Class C requirement for deterministic fault response - all actions occur within fixed hardware timing, independent of firmware latency. |
Use Scenario: Utility meter experiences brief grid outage during peak demand, requiring tamper-proof kWh accumulation to persist. IC Role / Device Role / Timing Role: ADM8691ANZ provides battery-backed VOUT to real-time clock and metrology RAM; WDO monitors MCU watchdog to detect lockup during metering algorithm execution. Use Value: Guarantees ANSI C12.20 accuracy compliance by maintaining timebase and energy counters through >10 s outages without data gap or rollover error. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691ACPE+ | Fixed 50 ms reset timeout; no adjustable watchdog; no CE gating; 8-pin PDIP/SOIC only. | Lacks RAM write protection and flexible timing - suitable only for basic reset-only designs without memory safety requirements. | Select when cost sensitivity outweighs feature needs and PCB layout accommodates larger 8-pin package. |
| TPS3823DBVT | Single 3.08 V reset threshold; no battery switchover; no watchdog; no PFI/PFO; SOT-23-5 package. | Designed for simple voltage monitoring only - cannot replace ADM8691ANZ in systems requiring backup power management or data retention. | Choose only for minimal footprint applications where battery backup, watchdog, and CE control are handled externally. |
Compared with MAX691ACPE+ and TPS3823DBVT, the ADM8691ANZ uniquely integrates battery switchover, CE gating, and dual-mode watchdog in a single 16-pin TSSOP - eliminating four discrete components and reducing BOM count while enabling certified data integrity in safety-critical systems.
Availability
ADM8691ANZ is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive telematics modules, medical infusion pumps, and smart energy meters requiring stable component supply, long-term lifecycle support, and guaranteed RoHS-compliant manufacturing.
Supply support for ADM8691ANZ 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 ADM8691ANZ belongs to Analog Devices' microprocessor supervisory product line, engineered specifically for fail-safe power management and data integrity in mission-critical embedded systems operating across extended industrial temperature ranges.
FAQ
What is the minimum VCC voltage at which ADM8691ANZ guarantees RESET assertion?
The ADM8691ANZ guarantees RESET remains active down to VCC = 1 V, ensuring the microprocessor stays held in reset during deep brownout conditions. This capability is explicitly specified in the datasheet's "RESET Output Voltage at VCC = 1 V" parameter (20 mV max sink voltage at 10 μA load), confirming functional operation well below standard logic thresholds - critical for orderly shutdown in systems with large output capacitance or slow discharge paths.
Can ADM8691ANZ support lithium coin cell backup without external charging circuitry?
Yes, ADM8691ANZ supports direct connection of lithium coin cells (e.g., CR2032) to VBATT without external charging components. Its VBATT terminal sources only 10 nA typical (0.1 μA max) leakage current - safely within the self-discharge rate of lithium batteries and sufficient to maintain charge over multi-year deployments. The device operates across VBATT = 2.0–4.25 V, covering the full discharge curve of common lithium chemistries.
How does the CE gating function of ADM8691ANZ prevent RAM corruption during power loss?
The ADM8691ANZ prevents RAM corruption by forcing CEOUT high whenever VCC falls below the 4.5 V reset threshold - regardless of CEIN state. This hardware-enforced action disables chip enable to battery-backed CMOS RAM within 3 ns, blocking write cycles before supply collapse. Unlike software-based solutions, this mechanism operates independently of MCU execution state, making it immune to lockups or interrupt latency - a key requirement for IEC 62304 and ISO 26262 compliance.
What are the valid configurations for adjusting the watchdog timeout period on ADM8691ANZ?
The ADM8691ANZ supports three watchdog timeout configurations: (1) OSC SEL high/floating + OSC IN low = 100 ms; (2) OSC SEL high/floating + OSC IN high/floating = 1.6 s; (3) OSC SEL low + external capacitor on OSC IN = adjustable period (e.g., 400 ms × C/47 pF). All modes guarantee 1.6 s timeout immediately after reset, giving firmware time to initialize before short-period supervision begins.
Is ADM8691ANZ pin-compatible with other devices in the ADM869x family?
No, ADM8691ANZ is not pin-compatible with ADM8690 or ADM8695. While all share the same 16-lead package footprint, pin functions differ significantly: ADM8690 is an 8-lead device; ADM8695 has different reset timeout (200 ms default) and lacks LOW LINE output. The ADM8691ANZ's specific pin mapping - including dedicated CEIN/CEOUT, BATT ON, and dual RESET outputs - is unique to its variant and documented in Figure 4 and Table 4 of the Rev. C datasheet.
ADM8691ANZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
ADM8691ANZ FAQ
1.How can I place an order for ADM8691ANZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8691ANZ 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 ADM8691ANZ reliable?
The price and inventory of ADM8691ANZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8691ANZ is usually 5 days.
3.What payment methods are accepted for ADM8691ANZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM8691ANZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM8691ANZ?
ADM8691ANZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8691ANZ 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 ADM8691ANZ?
For technical support, including ADM8691ANZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8691ANZ requirements.
6.How does Aetrix verify that ADM8691ANZ is sourced from the original manufacturer or authorized distributors?
All ADM8691ANZ 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 ADM8691ANZ meets industry standards.
7.What is the process for return or replacement of ADM8691ANZ?
All ADM8691ANZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM8691ANZ, 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 ADM8691ANZ part is unused and in its original packaging.
Return procedure for ADM8691ANZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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