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Analog Devices Inc. ADM708SAN
- Part No.:
- ADM708SAN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADM708SAN.pdf
- Description:
- IC SUPERVISOR MPU 2.93V WD 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:11,076
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Product details
Overview
ADM708SAN from Analog Devices is a 3 V microprocessor supervisory circuit with dual active-high/active-low reset outputs, 2.93 V reset threshold, 200 ms reset pulse width, 100 µA quiescent current, and integrated power-fail comparator (1.25 V PFI threshold), used for reliable power-on reset and brownout protection in battery-powered embedded systems.
For engineers reviewing the ADM708SAN datasheet, ADM708SAN pinout, ADM708SAN application, or ADM708SAN equivalent, key selection considerations include its dual-reset output capability, guaranteed RESET validity down to VCC = 1 V, absence of watchdog timer (distinguishing it from ADM706x variants), PDIP-8 package compatibility, and direct replacement suitability for MAX708S in 3 V systems requiring both RESET and RESET signals.
Technical Context
The ADM708SAN implements a precision voltage monitor with fixed 2.93 V reset threshold (±70 mV hysteresis) and internal timing circuitry that asserts both RESET and RESET outputs for 200 ms after VCC rises above threshold or MR deasserts. It integrates a dedicated 1.25 V reference-based power-fail comparator (PFI/PFO) enabling early low-supply warning without external components.
No watchdog timer is present - unlike ADM706S - simplifying system design where software supervision is handled externally or unnecessary. The device operates across VCC = 3.00 V to 5.5 V and guarantees functional reset assertion even as VCC drops to 1 V, ensuring deterministic microprocessor hold-down during power collapse.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V ±0.07 V - precisely monitors 3 V supply rails; triggers reset before critical brownout. |
| Reset Pulse Width | 200 ms typical - provides sufficient time for microprocessor power stabilization and initialization. | Quiescent Current | 100 µA at VCC < 3.6 V - enables long battery life in portable instruments and remote sensors. |
| PFI Threshold | 1.25 V - allows configurable power-fail detection via external resistor divider on any supply rail. |
| VCC Operating Range | 3.00 V to 5.5 V - supports 3 V, 3.3 V, and 5 V systems without level-shifting. |
| RESET Validity | Guaranteed down to VCC = 1 V - ensures microprocessor remains held in reset during full power collapse. |
| Output Drive | Active-high RESET: VOH ≥ 0.8×VCC @ 500 µA; Active-low RESET: VOL ≤ 0.3 V @ 500 µA - directly interfaces TTL/CMOS logic. |
Pinout & Package
ADM708SAN is housed in an 8-lead narrow-body plastic dual in-line package (PDIP), compliant with JEDEC MS-001, with 0.300-inch body width and 0.100-inch lead pitch. Pin 1 is marked with a notch or dot; leads are straight and through-hole mountable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Debounced TTL/CMOS-compatible input; internally pulled up with 70 µA; asserts reset when driven below 0.6 V. |
| 2 VCC | Power Supply Input | Main supply connection; requires 0.1 µF decoupling capacitor to GND for noise immunity. |
| 3 GND | Ground Reference | Common return path for all internal circuits and output drivers. |
| 4 PFI | Power-Fail Input | Noninverting input to 1.25 V comparator; monitors auxiliary supplies via external resistive divider. |
| 5 PFO | Power-Fail Output | Open-drain active-low output signaling PFI < 1.25 V; can drive interrupt or MR for cascaded reset. |
| 6 NC | No Connect | Internally unconnected; must remain floating - no external connection permitted. |
| 7 RESET | Active-Low Reset Output | Push-pull output asserted low for 200 ms during power-up/brownout; valid down to VCC = 1 V. |
| 8 RESET | Active-High Reset Output | Complementary push-pull output asserted high for 200 ms; eliminates need for external inverter. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals eliminate external inversion logic and reduce BOM count. |
| Guaranteed reset below 1 V VCC | Ensures microprocessor remains held in known state until complete power loss - critical for data integrity in battery backup systems. |
| Integrated 1.25 V power-fail comparator | Enables early warning of supply decay without external reference; supports monitoring of secondary rails (e.g., analog, RTC, or sensor supplies). |
| 200 ms reset timeout with hysteresis | Prevents spurious resets during marginal supply conditions; built-in hysteresis avoids oscillation near threshold. |
| 100 µA ultra-low quiescent current | Extends operational lifetime in always-on, energy-constrained applications such as portable medical devices and IoT edge nodes. |
Applications
| Battery-Powered Instrumentation | Industrial Microcontroller Systems |
|---|---|
Use Scenario: Portable multimeter or handheld data logger operating from two AA cells (2.4–3.2 V range) with EEPROM-backed configuration storage. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection, and low-battery warning via PFI monitoring of main supply. Use Value: Prevents corrupted EEPROM writes during voltage sag; dual RESET outputs simplify interface to mixed-signal MCU with bidirectional reset pin. | Use Scenario: PLC I/O module powered by isolated 3.3 V DC-DC converter, requiring fail-safe startup and supply monitoring. IC Role / Device Role / Timing Role: System-level supervisor asserting synchronized reset to ARM Cortex-M4 and FPGA upon power application or undervoltage event. Use Value: 200 ms reset pulse ensures full core initialization; PFO output triggers firmware-controlled graceful shutdown before main supply collapse. |
| Medical Diagnostic Equipment | Automotive Body Control Modules |
Use Scenario: Ultrasound probe with embedded DSP and flash memory, powered by rechargeable Li-ion (2.8–4.2 V), requiring deterministic boot sequencing. IC Role / Device Role / Timing Role: Primary reset generator holding DSP in reset until 3.3 V LDO stabilizes; PFI monitors battery voltage for low-power alert. Use Value: Dual RESET outputs enable direct connection to both DSP (active-low) and companion ASIC (active-high), eliminating level translators. | Use Scenario: Door module with CAN transceiver and microcontroller, supplied from vehicle battery (9–16 V) via 3.3 V regulator subject to load-dump transients. IC Role / Device Role / Timing Role: Supervisor detecting regulator dropout and asserting reset to prevent erratic MCU behavior during cranking or alternator failure. Use Value: Guaranteed RESET operation down to VCC = 1 V ensures MCU remains held during deep brownout; NC pin simplifies layout vs. watchdog-equipped variants. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM708SARZ | Same functionality and specifications, but in SOIC-8 (R-8) package instead of PDIP-8 (N-8). | Suitable for surface-mount production; requires PCB redesign for footprint and reflow process. | Select ADM708SARZ for automated assembly; ADM708SAN for prototyping, through-hole boards, or legacy designs. |
| MAX708SAP+ | Pin-compatible Maxim replacement; identical 2.93 V threshold, dual reset outputs, and PFI/PFO, but higher quiescent current (120 µA typ). | Valid drop-in substitute in existing ADM708SAN layouts; same PDIP-8 footprint and pinout. | Choose MAX708SAP+ only if ADM708SAN availability is constrained; verify 20 µA higher IQ meets battery runtime requirements. |
Compared with ADM708SARZ, ADM708SAN offers identical electrical performance in a through-hole package ideal for manual assembly and test fixtures; versus MAX708SAP+, it delivers lower quiescent current and guaranteed 1 V reset validity - critical for ultra-low-power and safety-critical applications.
Availability
ADM708SAN is available at Aetrix Electronics and suitable for battery-operated instrumentation, industrial microcontroller systems, medical diagnostic equipment, and automotive body control modules requiring stable component supply and long-term obsolescence management.
Supply support for ADM708SAN 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, communications, automotive, and healthcare markets with precision signal chain solutions.
The ADM708 series belongs to Analog Devices' microprocessor supervisory product line, designed specifically for robust power monitoring and deterministic reset generation in 3 V and 3.3 V embedded systems where reliability and low power are essential.
FAQ
What is the reset threshold voltage of the ADM708SAN?
The ADM708SAN has a nominal reset threshold voltage of 2.93 V, with a tolerance of ±0.07 V (2.85 V to 3.00 V). This value is factory-trimmed and temperature-stable, making it suitable for precise monitoring of 3 V supply rails. The threshold is referenced to an internal bandgap, ensuring consistent behavior across the −40°C to +85°C industrial temperature range. The ADM708SAN does not include hysteresis adjustment pins - its built-in hysteresis is fixed at 20 mV.
Does the ADM708SAN include a watchdog timer function?
No, the ADM708SAN does not include a watchdog timer. Unlike the ADM706S family, the ADM708SAN omits the WDI (watchdog input) and WDO (watchdog output) functions entirely - pins 6 and 8 in ADM706S are replaced by NC and RESET respectively. This simplifies design for applications where software supervision is handled externally or unnecessary, reducing risk of false timeouts and eliminating associated timing constraints. The ADM708SAN focuses solely on voltage monitoring and reset generation.
How does the ADM708SAN handle power-fail detection?
The ADM708SAN uses an internal 1.25 V reference to compare against an external voltage applied to the PFI pin. When the PFI voltage falls below 1.25 V, the open-drain PFO output pulls low, signaling impending power loss. This allows designers to configure early-warning thresholds for main or auxiliary supplies using a simple resistor divider. PFO can drive an interrupt line or be tied to MR for automatic system reset - a capability confirmed in the ADM708R/S/T functional block diagram and Applications Information section.
Can the ADM708SAN operate with supply voltages below 3 V?
Yes, the ADM708SAN guarantees functional reset assertion down to VCC = 1 V, though its specified operating range begins at 3.00 V. Below 3 V, the internal comparators and output drivers remain active and valid - a key differentiator from many competitors. This ensures the microprocessor stays held in reset during full power collapse. However, for continuous operation (e.g., monitoring PFI), VCC must remain ≥3.00 V per the Absolute Maximum Ratings table and Electrical Specifications.
What is the purpose of the NC pin on the ADM708SAN?
Pin 6 on the ADM708SAN is designated NC (No Connect) and is internally unconnected. It must remain floating - no external component or trace should connect to this pin. This pin replaces the WDI (watchdog input) found on the functionally distinct ADM706S, reflecting the ADM708SAN's simplified supervisory architecture without watchdog functionality. Its presence maintains pin compatibility with the 8-lead PDIP footprint shared across the ADM706/ADM708 families, easing board reuse.
ADM708SAN 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:
- -
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 160ms Minimum
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ADM708SAN FAQ
1.How can I place an order for ADM708SAN through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708SAN 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 ADM708SAN reliable?
The price and inventory of ADM708SAN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708SAN is usually 5 days.
3.What payment methods are accepted for ADM708SAN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708SAN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708SAN?
ADM708SAN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708SAN 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 ADM708SAN?
For technical support, including ADM708SAN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708SAN requirements.
6.How does Aetrix verify that ADM708SAN is sourced from the original manufacturer or authorized distributors?
All ADM708SAN 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 ADM708SAN meets industry standards.
7.What is the process for return or replacement of ADM708SAN?
All ADM708SAN units undergo pre-shipment inspection (PSI). If there is an issue with ADM708SAN, 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 ADM708SAN part is unused and in its original packaging.
Return procedure for ADM708SAN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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