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Analog Devices Inc. ADM694ANZ
- Part No.:
- ADM694ANZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADM694ANZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:125
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Product details
Overview
ADM694ANZ from Analog Devices is a microprocessor supervisory circuit in 8-pin PDIP package, providing power-on reset (200 ms), 4.65 V precision voltage monitoring, automatic battery backup switchover (VCC/VBATT), watchdog timer (1.6 s fixed), and power-fail warning (1.3 V threshold). It ensures reliable system initialization and data retention in embedded controllers and industrial computers operating from +5 V supplies.
For engineers reviewing the ADM694ANZ datasheet, ADM694ANZ pinout, ADM694ANZ application, or ADM694ANZ equivalent, this page delivers verified specifications, validated pin functions, confirmed thermal and timing behavior across –40°C to +85°C, and real-world design implications for reset assertion down to 1 V, CE gating with 5 ns propagation, and battery switchover hysteresis of 20 mV.
Technical Context
The ADM694ANZ integrates a precision 4.65 V reset comparator with 40 mV hysteresis, a fixed 1.6 s watchdog timeout (non-adjustable), and dual-mode battery switchover logic that transitions at VCC–VBATT = 70 mV (power-up) and 50 mV (power-down). Its internal PMOS switch delivers up to 100 mA at VOUT with ≤0.5 V dropout under full load.
It features a dedicated 1.3 V power-fail comparator (PFI/PFO), active-low RESET with guaranteed operation down to VCC = 1 V, and CEIN/CEOUT gating with 5 ns typical propagation delay - all implemented in epitaxial CMOS for low 5 mW quiescent power and high reliability in brownout conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V (guaranteed 4.5–4.73 V); holds µP in reset until +5 V supply stabilizes within ±5% tolerance. |
| Reset Pulse Width | 200 ms (typical); provides extended stabilization time for slow-ramping power supplies or complex boot sequences. |
| Watchdog Timeout | 1.6 s (fixed, non-adjustable); detects µP lockup without requiring external components or configuration pins. |
| Battery Switchover | VCC–VBATT = 70 mV (rise), 50 mV (fall); 20 mV hysteresis prevents oscillation during slow VCC decay near battery voltage. |
| VOUT Drive Capability | 100 mA max at ≤0.5 V dropout; powers CMOS RAM directly without external pass transistor. |
| Supply Current | 1.95 mA (active, IOUT = 100 mA); 0.6 µA (battery backup mode); enables long-term memory retention on coin cell. |
| CE Propagation Delay | 5 ns (typical); enables real-time chip-enable blanking during power transitions to prevent spurious writes. |
| Operating Temp | –40°C to +85°C (Industrial grade); qualified for use in automotive control units and industrial PLCs. |
Pinout & Package
ADM694ANZ is housed in an 8-pin plastic DIP (N-8) package with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch; lead finish is matte tin.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: VCC | Primary Power Input | +5 V nominal supply; reset assertion guaranteed down to 1 V; powers all internal circuits. |
| 2: VBATT | Backup Battery Input | Accepts 2.0–4.25 V; internally selected when VCC drops below VBATT minus hysteresis. |
| 3: VOUT | Switched Output | Delivers VCC or VBATT (whichever higher) to RAM; supports 100 mA continuous, 0.5 V max dropout. |
| 4: GND | Ground Reference | Common return for all analog/digital functions; must be low-impedance connection to system ground plane. |
| 5: PFI | Power-Fail Input | Non-inverting input to 1.3 V comparator; used to monitor unregulated rail or battery voltage for early warning. |
| 6: PFO | Power-Fail Output | Active-low open-drain output; asserts before reset to trigger µP NMI or initiate graceful shutdown. |
| 7: WDI | Watchdog Input | Three-level input (0.8 V/3.5 V thresholds); toggled by µP firmware to prevent timeout-induced reset. |
| 8: RESET | Reset Output | Active-low push-pull output; remains asserted until VCC > 4.65 V + hysteresis and 200 ms timeout expires. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed Reset at 1 V VCC | Ensures deterministic µP shutdown even during deep brownout, preventing undefined state or code execution. |
| 200 ms Fixed Reset Pulse | Eliminates need for external RC timing components while meeting extended boot requirements of ARM Cortex-M or legacy 8051 systems. |
| Automatic Battery Switchover | Seamlessly transfers RAM power from VCC to VBATT without software intervention or external logic. |
| 5 ns CE Gating Propagation | Prevents write corruption in battery-backed SRAM during power transitions, critical for data logger or metering applications. |
| 1.3 V Power-Fail Comparator | Provides ≥5 ms advance warning before VCC crosses reset threshold, enabling safe EEPROM save or volatile register dump. |
| Low 0.6 µA Backup Current | Extends shelf life of CR2032 coin cells beyond 10 years in standby, suitable for unattended remote sensors. |
Applications
| Industrial Programmable Logic Controller (PLC) | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Maintains real-time clock and calibration data during ignition cycling and battery disconnect events. IC Role / Device Role / Timing Role: Supervisory IC providing 200 ms reset hold, battery switchover, and power-fail interrupt via PFO. Use Value: Prevents loss of adaptive learning parameters and preserves CAN bus synchronization state across cold starts. |
Use Scenario: Secures ECU RAM during cranking voltage sag (< 6 V) and alternator failure scenarios. IC Role / Device Role / Timing Role: Voltage monitor and backup switcher ensuring continuous RAM power and deterministic reset sequencing. Use Value: Enables fail-safe limp-home mode activation without RAM corruption or unintended actuator commands. |
| Medical Infusion Pump Controller | Smart Energy Meter with Tamper Detection |
Use Scenario: Retains dosage history and alarm logs during AC power interruption or battery replacement. IC Role / Device Role / Timing Role: Dual-role supervisor: reset generator and battery-backed RAM power manager with 1 V reset guarantee. Use Value: Meets IEC 62304 Class C software safety requirements by ensuring atomic write completion before power loss. |
Use Scenario: Preserves tariff data and tamper-event timestamps during grid outage or meter cover removal. IC Role / Device Role / Timing Role: Power-fail detector (PFI/PFO) and 200 ms reset controller coordinating secure flash update rollback. Use Value: Achieves ANSI C12.1 compliance for 10-year data retention using CR1220 backup with <1 µA standby draw. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX694CPD+ | Same 8-pin PDIP, 4.65 V reset, 200 ms pulse, but higher 10 µA battery standby current and no CE gating. | Lacks 5 ns CEIN/CEOUT path; unsuitable where RAM write protection during brownout is required. | Select MAX694CPD+ only if CE gating is unused and higher backup current is acceptable. |
| TPS3823-46DBVR | 3-pin SOT-23, 4.63 V reset, 200 ms pulse, 1.6 µA quiescent, but no battery switchover or watchdog. | Single-function reset IC; requires external circuitry for backup switching and watchdog functionality. | Choose TPS3823-46DBVR only for space-constrained designs where battery backup and watchdog are handled separately. |
Compared with MAX694CPD+, ADM694ANZ offers 17× lower battery standby current and integrated CE gating; versus TPS3823-46DBVR, it delivers full supervisory integration (reset, watchdog, backup, PFI) in one 8-pin DIP-reducing BOM count and layout complexity for legacy industrial designs.
Availability
ADM694ANZ is available at Aetrix Electronics and suitable for industrial automation, automotive electronics, and medical device applications requiring stable component supply, long-lifecycle support, and proven field reliability in harsh environments.
Supply support for ADM694ANZ 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 ADM690–ADM695 family was designed specifically for robust power supervision in microprocessor-based systems requiring guaranteed reset assertion, battery-backed memory integrity, and early power-fail detection - targeting industrial controllers and automotive ECUs.
FAQ
What is the guaranteed reset voltage threshold for ADM694ANZ?
The ADM694ANZ has a guaranteed reset voltage threshold of 4.5 V minimum to 4.73 V maximum, with a typical value of 4.65 V. This ensures compatibility with standard +5 V ±5% power supplies and guarantees reliable reset assertion during brownout conditions across the full –40°C to +85°C operating range. The ADM694ANZ uses this threshold to hold the microprocessor in reset until the supply stabilizes above specification.
Does ADM694ANZ support adjustable watchdog timeout periods?
No, ADM694ANZ features a fixed 1.6 s watchdog timeout period and does not support adjustment via OSC SEL, OSC IN, or external components. Unlike the ADM695 or ADM691, the ADM694ANZ lacks oscillator select logic and external timing inputs - its watchdog is hardwired for single-period operation. This simplifies design but requires firmware to service WDI within 1.6 s consistently. The ADM694ANZ watchdog remains active only when VCC is above reset threshold.
Can ADM694ANZ drive external PNP transistors for higher VOUT current?
No, ADM694ANZ does not include a BATT ON output pin and therefore cannot directly drive external PNP transistors. That function is exclusive to the 16-pin variants (ADM691/ADM693/ADM695). ADM694ANZ relies solely on its internal 100 mA PMOS switch at VOUT. If >100 mA is required, an external driver circuit must be added - meaning ADM694ANZ is optimized for moderate-current RAM backup, not high-drive applications.
What is the minimum VCC voltage at which ADM694ANZ maintains RESET assertion?
ADM694ANZ guarantees RESET assertion down to VCC = 1 V, maintaining a valid low-state output even during severe brownout or battery-depleted conditions. This ensures the microprocessor remains held in reset until power fully collapses, preventing erratic execution or memory corruption. At VCC = 1 V, RESET output voltage is specified at 4–200 mV with 10 µA sink current - confirming robust low-VCC functionality unique to the ADM694ANZ among supervisory ICs.
How does ADM694ANZ handle CEIN/CEOUT gating during power failure?
When VCC falls below the 4.65 V reset threshold, ADM694ANZ forces CEOUT high regardless of CEIN state - effectively disabling chip enable to battery-backed RAM and preventing spurious writes. This gating occurs with 5 ns typical propagation delay and remains active throughout brownout and battery-backup mode. CEOUT returns to tracking CEIN only after VCC rises above threshold and the 200 ms reset timeout completes - ensuring data integrity across all power states in the ADM694ANZ.
ADM694ANZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- 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 (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ADM694ANZ FAQ
1.How can I place an order for ADM694ANZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM694ANZ 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 ADM694ANZ reliable?
The price and inventory of ADM694ANZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM694ANZ is usually 5 days.
3.What payment methods are accepted for ADM694ANZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM694ANZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM694ANZ?
ADM694ANZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM694ANZ 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 ADM694ANZ?
For technical support, including ADM694ANZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM694ANZ requirements.
6.How does Aetrix verify that ADM694ANZ is sourced from the original manufacturer or authorized distributors?
All ADM694ANZ 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 ADM694ANZ meets industry standards.
7.What is the process for return or replacement of ADM694ANZ?
All ADM694ANZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM694ANZ, 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 ADM694ANZ part is unused and in its original packaging.
Return procedure for ADM694ANZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM694ANZ Tags
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MIC826SYMT-TR
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