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Analog Devices Inc. ADM707AN
- Part No.:
- ADM707AN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADM707AN.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,887
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Product details
Overview
ADM707AN from Analog Devices is a low-cost microprocessor supervisory circuit designed for 5 V supply monitoring in embedded systems. It provides active-high and active-low reset outputs, precision 4.65 V supply voltage monitoring, 200 ms reset pulse width, and power-fail warning via PFI/PFO. It is used in industrial controllers to ensure reliable power-on reset and brownout recovery.
For engineers reviewing the ADM707AN datasheet, ADM707AN pinout, ADM707AN application, or ADM707AN equivalent, key selection criteria include reset threshold accuracy (4.65 V), dual reset polarity support, guaranteed RESET validity down to 1 V VCC, and compatibility with TTL/CMOS manual reset inputs.
Technical Context
The ADM707AN implements a precision bandgap-based voltage reference (4.65 V) for supply monitoring and integrates independent power-fail detection with a 1.25 V internal comparator threshold. Its dual-reset architecture delivers both active-low (RESET) and active-high (RESET) outputs from a single IC, eliminating need for external inverters in mixed-logic systems.
No watchdog timer is included - unlike ADM705/ADM706 - making it suitable for applications requiring only supply supervision and manual reset without processor activity monitoring. The MR input is internally debounced and pulled up with 250 µA, supporting direct switch or logic-level assertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±150 mV - ensures reset assertion during 5 V supply brownout before microprocessor malfunction. |
| Reset Pulse Width | 200 ms typical - provides sufficient hold time for microprocessor power-up stabilization and clock lock. |
| VCC Operating Range | 1.0 V to 5.5 V - guarantees valid reset output even during deep brownout or battery sag conditions. |
| Quiescent Current | 190 µA typical - enables low-power operation in always-on supervisory roles without burdening supply rails. |
| Power-Fail Threshold | 1.25 V ±25 mV on PFI - allows configurable early-warning detection of auxiliary supply failure using external resistor divider. |
| MR Input Pull-Up | 250 µA internal - eliminates need for external pull-up resistor when interfacing with open-drain or mechanical switches. |
| Reset Output Drive | 800 µA source / 1.2 mA sink - directly drives standard CMOS/TTL reset inputs without buffering. |
Pinout & Package
ADM707AN is supplied in an 8-lead narrow-body plastic dual-in-line package (PDIP, N-8), compliant with JEDEC MS-001-BA. Pin spacing is 0.100 inch (2.54 mm), with 0.300 inch body width and 0.200 inch height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | TTL/CMOS-compatible debounced input; asserted low <0.8 V; internally pulled up at 250 µA. |
| 2 (VCC) | Supply Input | 5 V nominal power rail; requires 0.1 µF decoupling capacitor to GND for noise immunity. |
| 3 (GND) | Ground Reference | 0 V return path for all analog and digital functions; must be low-impedance connection. |
| 4 (PFI) | Power-Fail Input | Noninverting input to 1.25 V comparator; monitors auxiliary supply via resistive divider. |
| 5 (PFO) | Power-Fail Output | Active-low open-drain output signaling PFI <1.25 V; sinks up to 3.2 mA. |
| 6 (NC) | No Connect | Internally unconnected; must remain floating or tied to GND per layout best practice. |
| 7 (RESET) | Active-Low Reset Output | Push-pull output asserted low for 200 ms during power-up/brownout/MR event. |
| 8 (RESET) | Active-High Reset Output | Inverted complement of RESET; enables direct interface with processors requiring active-high reset. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous active-low RESET and active-high RESET eliminate need for external inversion logic. |
| Guaranteed reset below 1 V VCC | Ensures microprocessor remains held in reset during full power-rail collapse, preventing undefined state. |
| Integrated power-fail comparator | 1.25 V reference + PFI/PFO pair enables early warning of secondary supply failure without extra ICs. |
| Debounced manual reset input | 200 ms internal timing prevents false resets from switch bounce or transient noise on MR line. |
| Low quiescent current | 190 µA operation supports long-life battery-backed or energy-constrained supervisory applications. |
Applications
| Industrial PLC Power Monitoring | Embedded Controller Brownout Protection |
|---|---|
Use Scenario: Monitoring 5 V system rail in programmable logic controller during factory floor voltage fluctuations. IC Role / Device Role / Timing Role: Supervisory circuit asserting both RESET and RESET to coordinate FPGA configuration and MCU boot sequence. Use Value: Prevents corrupted firmware load by holding reset until VCC stabilizes above 4.65 V for ≥200 ms. | Use Scenario: Ensuring safe shutdown in automotive body control module during alternator dropout events. IC Role / Device Role / Timing Role: Supply monitor triggering controlled firmware save and I/O isolation before brownout-induced crash. Use Value: Leverages PFI input to detect 12 V pre-regulator sag, generating PFO interrupt 50 ms before VCC drops below 4.65 V. |
| Medical Instrument Power Sequencing | Network Router Boot Integrity |
Use Scenario: Managing power-up sequence of ADC, microcontroller, and display driver in portable diagnostic device. IC Role / Device Role / Timing Role: Dual-reset output synchronizes reset release across mixed-voltage subsystems (3.3 V, 5 V). Use Value: RESET asserts active-high logic for 3.3 V FPGA while RESET holds 5 V analog section in reset for precise timing alignment. | Use Scenario: Guaranteeing deterministic boot of ARM-based network switch after AC power restoration. IC Role / Device Role / Timing Role: Supervisory circuit validating 5 V DC-DC output before releasing CPU reset and enabling PHY initialization. Use Value: 4.65 V threshold matches ATX-spec 5 V tolerance; 200 ms pulse exceeds minimum 100 ms CPU reset requirement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM707AR | Same electrical specs and pinout; SOIC-8 (R-8) package instead of PDIP-8 (N-8). | Suitable for surface-mount production; requires reflow-compatible PCB layout. | Select ADM707AR for automated assembly; ADM707AN for through-hole prototyping or legacy board repair. |
| MAX707CPA+ | Pin-compatible but 4.65 V reset threshold has ±2.5% tolerance vs. ADM707AN's ±150 mV (±3.2%). Higher 250 µA quiescent current. | Less precise brownout detection; may assert reset earlier under marginal 5 V conditions. | Choose MAX707CPA+ only if legacy MAXIM footprint reuse is mandatory; ADM707AN offers tighter threshold control. |
Compared with ADM707AR and MAX707CPA+, the ADM707AN provides superior reset threshold accuracy in a through-hole package ideal for lab validation and small-batch industrial control boards - balancing precision, ease of handling, and proven reliability in temperature-cycled environments.
Availability
ADM707AN is available at Aetrix Electronics and suitable for industrial PLCs, medical instrumentation, network infrastructure equipment, and embedded controllers requiring stable component supply with long-term lifecycle assurance.
Supply support for ADM707AN 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADM707AN belongs to the ADM705–ADM708 supervisory family, engineered specifically for robust 5 V microprocessor power monitoring in industrial and automotive environments where supply integrity is mission-critical.
FAQ
What is the reset threshold voltage of the ADM707AN?
The ADM707AN has a nominal reset threshold of 4.65 V, with a specified tolerance of ±150 mV (4.50 V to 4.75 V) over temperature. This value is laser-trimmed at wafer test and guaranteed across the −40°C to +85°C industrial range. The ADM707AN uses this threshold to assert RESET and RESET whenever VCC falls below the trip point, ensuring consistent brownout response in all operating conditions.
Does the ADM707AN include a watchdog timer function?
No, the ADM707AN does not include a watchdog timer. Unlike the ADM705/ADM706 variants, the ADM707AN omits WDI and WDO pins and related circuitry. Its functional block diagram confirms dedicated reset generation and power-fail monitoring only. If watchdog functionality is required, the ADM705AN or ADM706AN must be selected instead - the ADM707AN is optimized strictly for supply supervision and manual reset.
Can the ADM707AN drive a microprocessor reset pin directly?
Yes, the ADM707AN can drive most microprocessor reset pins directly. Its RESET output sources up to 800 µA and sinks up to 1.2 mA, meeting standard CMOS/TTL input requirements. For processors with higher input capacitance or longer trace lengths, a series resistor (e.g., 4.7 kΩ) is recommended to prevent contention on bidirectional reset lines - as documented in Figure 21 of the ADM707AN datasheet.
What is the purpose of the NC pin on the ADM707AN?
Pin 6 on the ADM707AN is marked NC (No Connect) and is internally unconnected. It must not be bonded or routed to any signal or power net. Per Analog Devices' design guidance, NC pins should remain floating or be tied to GND for mechanical stability - but never used as a spare I/O or ground path. This pin exists due to shared die layout with the ADM705/ADM706 (which use Pin 6 for WDI) and has no electrical function in the ADM707AN.
How does the ADM707AN handle power-fail detection?
The ADM707AN performs power-fail detection using its PFI (Power-Fail Input) and PFO (Power-Fail Output) pins. An internal 1.25 V comparator compares the voltage at PFI against a precision reference. When PFI drops below 1.25 V - typically set via an external resistor divider from a secondary supply - PFO asserts low. This signal can trigger an interrupt or feed into MR to generate a system reset, enabling graceful shutdown before main supply collapse.
ADM707AN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 160ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ADM707AN FAQ
1.How can I place an order for ADM707AN through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM707AN 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 ADM707AN reliable?
The price and inventory of ADM707AN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM707AN is usually 5 days.
3.What payment methods are accepted for ADM707AN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM707AN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM707AN?
ADM707AN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM707AN 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 ADM707AN?
For technical support, including ADM707AN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM707AN requirements.
6.How does Aetrix verify that ADM707AN is sourced from the original manufacturer or authorized distributors?
All ADM707AN 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 ADM707AN meets industry standards.
7.What is the process for return or replacement of ADM707AN?
All ADM707AN units undergo pre-shipment inspection (PSI). If there is an issue with ADM707AN, 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 ADM707AN part is unused and in its original packaging.
Return procedure for ADM707AN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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