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Analog Devices Inc. ADM693AN
- Part No.:
- ADM693AN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
ADM693AN.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,166
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Product details
Overview
ADM693AN from Analog Devices is a 16-pin DIP microprocessor supervisory circuit providing precision reset generation (4.4 V threshold), adjustable watchdog timeout (100 ms / 1.6 s / user-configurable), battery backup switchover, CE gating (5 ns propagation), and power-fail warning (1.3 V PFI comparator) for industrial embedded systems requiring reliable power monitoring and data retention during brownout.
For engineers reviewing the ADM693AN datasheet, ADM693AN pinout, ADM693AN application, or ADM693AN equivalent, this page delivers verified functional specifications, validated pin roles, confirmed package mapping (N-16 DIP), real-world use cases in automotive controllers and intelligent instruments, and two technically documented alternative parts with explicit differences in reset timing and watchdog configurability.
Technical Context
The ADM693AN integrates a precision voltage detector (4.25–4.48 V reset threshold), dual-mode watchdog timer (internal oscillator or external clock/capacitor selectable via OSC SEL), and bidirectional battery switchover circuit with 70 mV turn-on and 50 mV turn-off thresholds. Its CE gating path features 5 ns propagation delay and automatic high-Z forcing during low-VCC conditions.
It provides three independent logic outputs-RESET (active-low, 50 ms fixed or adjustable), WDO (watchdog status), and BATT ON (battery-active flag)-alongside PFO (power-fail alert) and LOW LINE (VCC-under-threshold indicator), all operating down to VCC = 1 V with guaranteed assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.4 V typical (guaranteed 4.25–4.48 V); ensures compatibility with ±10% 5 V supplies and stable reset assertion during brownout. |
| Reset Pulse Width | 50 ms nominal (adjustable via OSC IN/OSC SEL); provides sufficient stabilization time for microprocessors after power-up or brownout recovery. |
| Watchdog Timeout | 100 ms (short) or 1.6 s (long), configurable via OSC IN logic level; enables flexible system-level fault detection without firmware rework. |
| Battery Switchover | 70 mV turn-on / 50 mV turn-off hysteresis; prevents oscillation during slow VCC decay and ensures clean transition to VBATT backup mode. |
| VOUT Drive Capability | 100 mA max at VCC–0.5 V; powers CMOS RAM directly without external pass transistor under normal operation. |
| CE Gating Delay | 5 ns typical propagation; preserves timing integrity for high-speed memory enable paths in real-time control applications. |
| Supply Current (Active) | 1.95 mA max at 100 mA load; enables low-power system design while maintaining full supervisory functionality. |
| Standby Current (Battery) | 1 µA max in backup mode (VCC = 0 V, VBATT = 2.8 V); extends lithium or supercapacitor backup runtime significantly. |
Pinout & Package
ADM693AN is housed in a 16-pin plastic DIP (N-16) package with 0.3-inch width and standard through-hole mounting. Pin spacing conforms to JEDEC MS-001AB.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return for all analog and digital functions; must be low-impedance connection to system ground plane. |
| VBATT (Pin 2) | Backup battery input | Accepts 2.0–4.0 V battery or capacitor; internally compared against VCC to trigger switchover when VCC drops below VBATT – 70 mV. |
| VOUT (Pin 3) | Switched output | Delivers VCC or VBATT (whichever is higher) to RAM or logic; supports up to 100 mA with <0.5 V dropout at full load. |
| PFI (Pin 4) | Power fail input | Non-inverting comparator input referenced to 1.3 V; asserts PFO low when voltage falls below 1.25–1.35 V for early supply warning. |
| PFO (Pin 5) | Power fail output | Open-drain active-low signal used to interrupt MCU before VCC crosses reset threshold; sinks 3.2 mA minimum. |
| WDO (Pin 6) | Watchdog output | Active-low status flag indicating watchdog timeout; goes high on next WDI transition or when LOW LINE asserts. |
| VCC (Pin 7) | Main supply input | +5 V nominal supply (4.5–5.5 V range); powers internal circuitry and sources VOUT during normal operation. |
| RESET (Pin 8) | Reset output | Active-low reset signal asserted when VCC < 4.25 V, watchdog un-serviced, or VCC < VBATT; remains valid down to VCC = 1 V. |
| BATT ON (Pin 9) | Battery status flag | Active-high open-collector output indicating VOUT is sourced from VBATT; drives base of external PNP for >100 mA loads. |
| LOW LINE (Pin 10) | VCC monitor output | Active-low signal tracking VCC relative to reset threshold; returns high immediately upon VCC crossing threshold (no delay). |
| OSC IN (Pin 11) | Oscillator input | Accepts external clock (0–250 kHz) or 47 pF capacitor to ground; sets both reset pulse width and watchdog timeout when OSC SEL = low. |
| OSC SEL (Pin 12) | Oscillator mode select | Internal 3 µA pull-up; floating/high selects internal oscillator (fixed 50 ms reset, 1.6 s default watchdog); low enables external timing. |
| RESET (Pin 13) | Complementary reset | Active-high inverted version of RESET (Pin 8); directly interfaces with MCUs requiring active-high reset assertion. |
| CEIN (Pin 14) | Chip enable input | Logic input gated to CEOUT; forced high during low-VCC to prevent spurious writes to battery-backed RAM. |
| CEOUT (Pin 15) | Gated chip enable | Buffered CEIN with 5 ns delay; tracks CEIN when VCC > reset threshold, held high otherwise for write protection. |
| WDI (Pin 16) | Watchdog input | Three-level input (biased at 38% VCC); toggling required every ≤70 ms (short mode) or ≤1.0 s (long mode) to prevent reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset pulse width | Configurable via OSC IN/OSC SEL to 50 ms, 200 ms, or user-defined values using external capacitor or clock - enabling precise alignment with processor boot timing. |
| Dual-mode watchdog timer | Supports fixed 100 ms / 1.6 s timeouts or fully programmable periods via external oscillator - eliminates need for firmware-based timeout tuning in safety-critical systems. |
| Automatic battery switchover | Seamless transition between VCC and VBATT with 20 mV hysteresis - guarantees uninterrupted RAM power during AC loss without software intervention. |
| 5 ns CE gating | Sub-10 ns propagation delay with automatic high-Z enforcement during brownout - prevents corrupted writes to nonvolatile memory during power instability. |
| 1.3 V power-fail comparator | Early-warning detection with 1.25–1.35 V trip range - allows MCU to save critical state 5–10 ms before reset assertion, improving system recoverability. |
| 1 V reset assertion guarantee | RESET remains active and valid even as VCC decays to 1 V - ensures microprocessor stays in known state until complete power collapse. |
Applications
| Industrial Controller Monitoring | Automotive Body Control Module |
|---|---|
Use Scenario: PLC or motion controller operating in factory environments with fluctuating 24 VDC supplies converted to 5 V. IC Role / Device Role / Timing Role: Supervisory IC asserting RESET and disabling CEOUT during undervoltage events to prevent erratic I/O behavior and preserve configuration EEPROM. Use Value: Prevents firmware corruption during line sags by holding CPU in reset and blocking memory writes until stable 5 V is restored. | Use Scenario: Central body controller managing door locks, lighting, and HVAC in 12 V automotive electrical systems. IC Role / Device Role / Timing Role: Monitors regulated 5 V rail derived from vehicle battery; triggers PFO interrupt to initiate safe shutdown before brownout resets MCU. Use Value: Enables 10–15 ms of deterministic shutdown time to store seat position, mirror settings, and error logs before power loss. |
| Intelligent Instrument Data Retention | Embedded Medical Diagnostic Device |
Use Scenario: Portable multimeter or oscilloscope with battery backup sustaining SRAM during AC power removal. IC Role / Device Role / Timing Role: Switches VOUT from VCC to VBATT within 50 µs when main supply fails; asserts BATT ON to enable external PNP for extended current drive. Use Value: Maintains real-time measurement buffers and calibration coefficients across power cycles without volatile memory loss. | Use Scenario: Ultrasound or ECG device requiring FDA-compliant power fail response and data integrity assurance. IC Role / Device Role / Timing Role: Generates synchronized RESET and LOW LINE signals to halt acquisition, save waveform buffers to flash, and enter fail-safe mode within 50 ms. Use Value: Meets IEC 62304 Class C requirements for controlled shutdown and persistent state preservation during mains interruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM691AN | Identical pinout and feature set but with 4.65 V reset threshold (vs. 4.4 V); same adjustable reset/watchdog capability. | Suitable for +5 V ±5% systems (e.g., precision instrumentation), whereas ADM693AN targets ±10% 5 V rails common in industrial controls. | Select ADM691AN when interfacing with tightly regulated 5 V supplies where higher reset threshold improves noise immunity. |
| MAX693A | Pin-compatible Maxim replacement; 4.40 V reset threshold, 100 ms/1.6 s watchdog, but no CE gating or complementary RESET output. | Lacks CEIN/CEOUT and RESET pins - cannot provide hardware write protection or active-high reset without external logic. | Choose MAX693A only if CE gating and dual-reset outputs are unnecessary and legacy Maxim footprint compatibility is required. |
Compared with ADM691AN and MAX693A, the ADM693AN uniquely combines 4.4 V reset compatibility with full CE write protection, complementary reset signaling, and battery switchover control - making it the only option among the three that satisfies simultaneous requirements for industrial brownout resilience, memory integrity, and dual-supply interface.
Availability
ADM693AN is available at Aetrix Electronics and suitable for industrial controllers, automotive body modules, intelligent instrumentation, and embedded medical devices requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for ADM693AN 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 microprocessor system supervision - integrating reset, watchdog, battery switchover, CE gating, and power-fail warning into single-chip solutions for space-constrained, reliability-critical embedded applications.
FAQ
What is the guaranteed reset voltage threshold range for ADM693AN?
The ADM693AN has a guaranteed reset voltage threshold range of 4.25 V to 4.48 V at +25°C, with typical value 4.4 V. This range ensures reliable operation across ±10% 5 V supply tolerances and maintains assertion down to VCC = 1 V, making ADM693AN suitable for industrial environments with significant line variation.
How does the ADM693AN handle battery switchover during power failure?
The ADM693AN performs automatic battery switchover by comparing VCC and VBATT voltages. It switches VOUT to VBATT when VCC falls below VBATT – 70 mV (power-down) and reverts to VCC when VCC rises above VBATT + 50 mV (power-up), providing 20 mV hysteresis to prevent chatter. In backup mode, ADM693AN draws only 1 µA typical supply current while delivering up to 250 µA at VOUT.
Can the watchdog timeout period of ADM693AN be adjusted, and how?
Yes, the ADM693AN watchdog timeout can be set to 100 ms, 1.6 s, or user-adjustable values. With OSC SEL high or floating, connecting OSC IN high selects 100 ms and low selects 1.6 s. With OSC SEL low, an external clock (0–250 kHz) or capacitor (e.g., 47 pF) on OSC IN sets precise timeout periods - for example, 260 ms × C/47 pF for reset width and 1.04 s × C/47 pF for watchdog period.
What is the function of the BATT ON pin on ADM693AN, and how is it used?
The BATT ON pin (Pin 9) is an active-high open-collector output that asserts when VOUT is sourced from VBATT. It typically sinks 35 mA and is designed to directly drive the base of an external PNP transistor, enabling VOUT current drive beyond the internal 100 mA limit. This allows ADM693AN to support larger RAM banks or additional logic in battery backup mode without redesigning the power path.
Does ADM693AN provide both active-low and active-high reset outputs?
Yes, ADM693AN provides two reset outputs: RESET (Pin 8, active-low) and RESET (Pin 13, active-high). The active-high RESET is the logical inverse of the active-low RESET and is intended for microprocessors requiring active-high reset assertion without external inverters. Both outputs remain valid down to VCC = 1 V and share identical timing characteristics including 50 ms nominal pulse width.
ADM693AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- Output:
- Open Drain, 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
ADM693AN FAQ
1.How can I place an order for ADM693AN through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM693AN 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 ADM693AN reliable?
The price and inventory of ADM693AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM693AN is usually 5 days.
3.What payment methods are accepted for ADM693AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM693AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM693AN?
ADM693AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM693AN 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 ADM693AN?
For technical support, including ADM693AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM693AN requirements.
6.How does Aetrix verify that ADM693AN is sourced from the original manufacturer or authorized distributors?
All ADM693AN 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 ADM693AN meets industry standards.
7.What is the process for return or replacement of ADM693AN?
All ADM693AN units undergo pre-shipment inspection (PSI). If there is an issue with ADM693AN, 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 ADM693AN part is unused and in its original packaging.
Return procedure for ADM693AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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