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Analog Devices Inc. ADM8694ARNZ
- Part No.:
- ADM8694ARNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM8694ARNZ.pdf
- Description:
- IC SUPERVISOR MPU 4.65V 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,545
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Product details
Overview
ADM8694ARNZ from Analog Devices is a microprocessor supervisory circuit providing power-on reset, battery backup switchover, watchdog timer, and power-fail detection in a single 16-lead TSSOP package. It features a 4.65 V reset threshold, 200 ms reset timeout (adjustable), 100 ms/1.6 s watchdog options, 100 mA VOUT drive, and operates down to 1 V VCC. It is used in industrial controllers and embedded systems requiring reliable power monitoring and nonvolatile memory protection.
For engineers reviewing the ADM8694ARNZ datasheet, ADM8694ARNZ pinout, ADM8694ARNZ application, or ADM8694ARNZ equivalent, key selection considerations include its dual-mode watchdog timing, battery switchover hysteresis (20 mV), CE gating with 3 ns propagation delay, and compatibility with 5 V ±5% supplies - all critical for deterministic system startup and brownout recovery.
Technical Context
The ADM8694ARNZ implements a precision voltage monitor with 40 mV hysteresis and guarantees RESET assertion down to VCC = 1 V. Its internal oscillator supports fixed (100 ms / 1.6 s) or adjustable watchdog timeout via OSC IN capacitor or external clock, with automatic long-period timeout immediately after reset.
It integrates bidirectional battery switchover using low-RON PMOS (0.7 Ω normal, 7 Ω backup), delivering up to 100 mA from VOUT while maintaining <0.2 V dropout at full load. The CEIN/CEOUT gating path enforces write protection by forcing CEOUT high during undervoltage, independent of CEIN state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V nominal (4.5–4.73 V range); ensures compatibility with 5 V ±5% supplies and stable reset assertion during brownout. |
| Reset Timeout | 200 ms typical (adjustable); provides sufficient stabilization time for microprocessors after power recovery. |
| VOUT Drive Capability | 100 mA max at ≤0.2 V dropout; powers CMOS RAM directly without external pass transistor. |
| Battery Switchover Hysteresis | 20 mV; prevents oscillation during slow VCC decay near VBATT crossover point. |
| Watchdog Timeout Options | 100 ms (short) or 1.6 s (long), selectable via OSC IN; short period activates after first WDI transition post-reset. |
| CE Gating Propagation Delay | 3 ns; enables real-time chip enable control during power transitions without timing penalty. |
| Supply Current (Normal) | 200 μA typical; minimizes quiescent load on main supply in always-on monitoring applications. |
| Standby Current (Battery Mode) | 0.4 μA typical; extends backup battery life for multi-year memory retention. |
Pinout & Package
ADM8694ARNZ is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch), pin-compatible with other ADM8691/ADM8695 variants in SOIC_N, SOIC_W, and PDIP packages.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VBATT | Backup battery input; internally selected over VCC when VCC drops below VBATT − 70 mV (power-down) or VBATT + 50 mV (power-up). |
| 2 | VOUT | Switched output; delivers VCC or VBATT to RAM/backup logic with ≤0.2 V dropout at 100 mA. |
| 3 | VCC | Main 5 V supply input; monitored for reset generation and switchover control. |
| 4 | GND | System ground reference for all analog and digital functions. |
| 5 | BATT ON | Active-high battery status flag; sinks 35 mA to drive external PNP base for >100 mA VOUT extension. |
| 6 | LOW LINE | Active-low undervoltage indicator; asserts immediately when VCC falls below 4.65 V threshold. |
| 7 | OSC IN | Oscillator input; accepts external clock (0–500 kHz) or 47 pF capacitor to set reset/watchdog timing. |
| 8 | OSC SEL | Oscillator mode select; floating/high enables internal oscillator; low enables external timing source. |
| 9 | PFI | Power-fail comparator input; triggers PFO low when voltage drops below 1.3 V (±50 mV over temp). |
| 10 | PFO | Power-fail output; interrupts MCU to initiate data save before VCC collapse. |
| 11 | WDI | Watchdog input; three-level (0.8 V / 3.5 V) interface; reset triggered if no transition occurs within timeout window. |
| 12 | CEOUT | Gated chip enable output; tracks CEIN when VCC ≥ 4.65 V; forced high during reset for write protection. |
| 13 | CEIN | Chip enable input; connected to MCU's CE/CS line to enable CEOUT gating function. |
| 14 | WDO | Watchdog status output; goes low on timeout and returns high on next WDI transition or LOW LINE assertion. |
| 15 | RESET | Active-low reset output; 50 ms pulse for ADM8690/ADM8691, 200 ms for ADM8695; guaranteed active down to VCC = 1 V. |
| 16 | RESET | Active-high reset output; complement of pin 15; supports processors requiring high-asserted reset signal. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable Reset & Watchdog Timing | Configurable via OSC IN capacitor (e.g., 47 pF → 200 ms reset, 520 ms watchdog) or external clock, enabling precise tuning to system boot and watchdog requirements. |
| Low-Dropout Battery Switchover | 0.7 Ω RON PMOS switch delivers 100 mA at ≤0.2 V dropout, eliminating need for external pass devices in most RAM backup designs. |
| 3 ns CE Gating Propagation | Ensures immediate write disable during brownout without compromising normal operation speed or adding timing margin overhead. |
| 1.3 V Power-Fail Comparator | Monitors auxiliary rails (e.g., 3.3 V, 2.5 V) or battery voltage independently of VCC, enabling early warning and graceful shutdown sequencing. |
| Ultra-Low Standby Current | 0.4 μA in battery-backup mode extends lithium or supercapacitor life beyond 10 years for infrequently powered systems. |
| Three-Level WDI Interface | Internally biased to 38% VCC with ~5 MΩ impedance; tolerant of floating, mid-supply, or driven states - simplifies MCU GPIO assignment and eliminates pull-up/pull-down components. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
|
Use Scenario: Maintains RAM integrity and initiates controlled shutdown during AC mains interruption or DC supply sag in programmable logic controllers. IC Role / Device Role / Timing Role: Supervisory IC providing reset assertion, battery switchover, and power-fail interrupt (PFO) to preserve I/O state and program memory. Use Value: Guarantees 200 ms reset hold time and 100 mA VOUT drive to sustain SRAM during 100–200 ms backup window, preventing spurious reboots or configuration loss. |
Use Scenario: Secures calibration data and patient session logs in portable ultrasound or ECG units during battery swap or low-voltage conditions. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main 5 V rail for reset and uses PFI to track 3.3 V analog subsystem voltage for preemptive PFO warning. Use Value: 1.3 V PFI threshold enables accurate detection of 3.3 V rail collapse 10–15 ms before VCC reset threshold breach, allowing time-critical data flush to EEPROM. |
| Automotive Body Control Module | Smart Energy Meter |
|
Use Scenario: Ensures deterministic MCU reset and EEPROM write protection during cold-crank (battery dip to 6 V) or load-dump transients. IC Role / Device Role / Timing Role: Combines reset generation, CE gating (via CEIN/CEOUT), and watchdog supervision to prevent corrupted flash writes during voltage instability. Use Value: 3 ns CEOUT propagation and forced-high behavior during undervoltage eliminate race conditions between reset deassertion and write-enable release - critical for AEC-Q100 compliance. |
Use Scenario: Preserves tariff and consumption history in utility meters during grid outage, using supercapacitor backup and precise power-fail detection. IC Role / Device Role / Timing Role: Battery switchover controller and power-fail detector: switches VOUT to supercapacitor at VCC < VBATT − 70 mV and asserts PFO at 1.3 V to trigger last-write sequence. Use Value: 20 mV switchover hysteresis prevents chatter during slow capacitor discharge; 0.4 μA standby current enables >5-year backup with 0.47 F supercapacitor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM8695ARWZ | Same functional set and pinout; differs only in package (16-lead SOIC_W vs. TSSOP). Electrical specs identical. | No change in circuit design or layout; direct footprint substitution possible with minor solder paste adjustment. | Select ADM8695ARWZ only when SOIC_W mechanical fit or thermal performance (θJA = 73°C/W) is preferred over TSSOP. |
| MAX695CPE+ | Fixed 50 ms reset, no CE gating or adjustable watchdog; 8-pin DIP/SOIC; lacks PFO, BATT ON, OSC IN/SEL pins. | Supports basic reset + battery switchover only; unsuitable for systems requiring write protection or programmable timing. | Choose MAX695CPE+ only for legacy 8-pin designs where CE gating and dual watchdog modes are unnecessary. |
Compared with ADM8694ARNZ, ADM8695ARWZ offers identical functionality in a wider SOIC package with better thermal dissipation, while MAX695CPE+ provides a cost-optimized, minimal-feature alternative lacking CE control, PFO, and timing flexibility - making ADM8694ARNZ the optimal choice for new designs requiring full supervisory feature integration in space-constrained layouts.
Availability
ADM8694ARNZ is available at Aetrix Electronics and suitable for industrial controllers, medical instrumentation, automotive body electronics, and smart metering applications requiring stable component supply, long-term lifecycle support, and guaranteed traceability.
Supply support for ADM8694ARNZ 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 ADM869x family was designed specifically for robust microprocessor supervision in harsh environments - integrating reset, watchdog, battery switchover, and memory protection into one IC to reduce board area and improve system reliability.
FAQ
What is the reset timeout duration for ADM8694ARNZ?
The ADM8694ARNZ has a nominal reset timeout of 200 ms, which is adjustable via the OSC IN pin using an external capacitor or clock signal. This value is fixed for the ADM8690/ADM8691 but configurable for the ADM8694ARNZ and ADM8695, supporting system-specific boot timing requirements without firmware changes.
Does ADM8694ARNZ support both active-high and active-low reset outputs?
Yes, ADM8694ARNZ provides two dedicated reset outputs: pin 15 is active-low RESET, and pin 16 is active-high RESET - the logical inverse. This dual-output architecture eliminates the need for external inverters when interfacing with MCUs requiring either polarity, simplifying board design and improving noise immunity.
Can ADM8694ARNZ drive CMOS RAM directly without external components?
Yes, ADM8694ARNZ can drive CMOS RAM directly: its VOUT pin delivers up to 100 mA with ≤0.2 V dropout at full load, and includes internal 3 μA pull-up on RESET. No external pass transistor, pull-up resistor, or level shifter is required for standard 5 V SRAM interfaces.
How does the watchdog timer behave immediately after power-on reset?
Upon power-on or brownout reset, the ADM8694ARNZ watchdog timer defaults to the long timeout period (1.6 s), regardless of OSC IN state. Only after the first valid WDI transition does it switch to the configured short (100 ms) or long mode - ensuring safe MCU initialization before watchdog enforcement begins.
What is the purpose of the BATT ON pin on ADM8694ARNZ?
The BATT ON pin on ADM8694ARNZ is an open-drain logic output that goes high when VOUT is sourced from VBATT (i.e., during battery backup). It can sink 35 mA and is intended to drive the base of an external PNP transistor, enabling VOUT current extension beyond the internal 100 mA limit - critical for high-capacity RAM or peripheral powering.
Is ADM8694ARNZ compatible with 3.3 V microcontrollers?
ADM8694ARNZ is specified for 5 V operation (VCC = 4.75–5.5 V) and is not rated for direct 3.3 V supply. However, its PFI input accepts 1.3 V thresholds and WDI is three-level with internal biasing, allowing interface to 3.3 V MCUs via level-shifting on control signals - but VCC must remain at 5 V for proper reset threshold and VOUT regulation.
ADM8694ARNZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM8694ARNZ FAQ
1.How can I place an order for ADM8694ARNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8694ARNZ 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 ADM8694ARNZ reliable?
The price and inventory of ADM8694ARNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8694ARNZ is usually 5 days.
3.What payment methods are accepted for ADM8694ARNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM8694ARNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM8694ARNZ?
ADM8694ARNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8694ARNZ 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 ADM8694ARNZ?
For technical support, including ADM8694ARNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8694ARNZ requirements.
6.How does Aetrix verify that ADM8694ARNZ is sourced from the original manufacturer or authorized distributors?
All ADM8694ARNZ 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 ADM8694ARNZ meets industry standards.
7.What is the process for return or replacement of ADM8694ARNZ?
All ADM8694ARNZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM8694ARNZ, 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 ADM8694ARNZ part is unused and in its original packaging.
Return procedure for ADM8694ARNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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