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Analog Devices Inc. ADM708SANZ
- Part No.:
- ADM708SANZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADM708SANZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,745
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Product details
Overview
ADM708SANZ from Analog Devices is a 3 V microprocessor supervisory circuit with dual active-high and 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 threshold) for battery warning or auxiliary supply monitoring in embedded control systems.
For engineers reviewing the ADM708SANZ datasheet, ADM708SANZ pinout, ADM708SANZ application, or ADM708SANZ equivalent, key selection criteria include dual-reset polarity support, guaranteed RESET validity down to 1 V VCC, debounced manual reset input, PDIP-8 package compatibility, and absence of watchdog timer-making it suitable for cost-sensitive, space-constrained 3 V microcontroller systems requiring deterministic reset behavior without watchdog supervision.
Technical Context
The ADM708SANZ implements a precision voltage monitor with fixed 2.93 V reset threshold and hysteresis of 20 mV, ensuring stable reset assertion during brownout recovery. Its dual-reset architecture provides simultaneous active-high (RESET) and active-low (RESET) outputs, eliminating need for external inverters in bidirectional or mixed-logic reset interfaces.
It integrates a dedicated 1.25 V reference-based power-fail comparator (PFI/PFO), enabling early-warning detection of supply droop or low-battery conditions independent of VCC monitoring. Unlike the ADM706x series, it omits the watchdog timer circuit, simplifying timing-critical designs where software-level supervision is handled externally or not required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V ±0.08 V - precisely triggers reset when 3 V supply drops below safe operating level for microcontrollers. |
| Reset Pulse Width | 200 ms typical - ensures sufficient hold time for full microprocessor power-up stabilization after VCC rise. |
| Quiescent Current | 100 µA at VCC < 3.6 V - enables long battery life in portable instrumentation and remote sensors. |
| Power-Fail Threshold | 1.25 V ±0.05 V - supports accurate low-battery warning or secondary supply monitoring via resistive divider on PFI. |
| VCC Validity Range | 1.0 V to 5.5 V - guarantees functional RESET output even during deep brownout, preventing premature release. |
| Output Drive Strength | VOH = 0.8×VCC / VOL = 0.3 V @ 500 µA sink - directly interfaces TTL/CMOS logic without pull-up/pull-down dependencies. |
Pinout & Package
ADM708SANZ is housed in an 8-lead narrow-body plastic dual in-line package (PDIP, N-8), compliant with JEDEC MS-001, with 0.300-inch body width and 0.100-inch lead pitch. Pin 1 is marked by a notch or dot; leads are straight and through-hole mountable.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Debounced Manual Reset Input | Internally pulled up with 70 µA; accepts TTL/CMOS levels; initiates 200 ms reset pulse when driven below 0.6 V. |
| 2 VCC | Positive Supply Input | Accepts 1.0–5.5 V; requires local 0.1 µF decoupling to GND for noise immunity during reset transitions. |
| 3 GND | Ground Reference | Common return for all internal circuits and output drivers; must be low-impedance connection. |
| 4 PFI | Power-Fail Input | Noninverting input to 1.25 V comparator; monitors auxiliary supply or battery voltage via external resistor divider. |
| 5 PFO | Power-Fail Output | Active-low open-drain output signaling PFI < 1.25 V; can drive interrupt line or be tied to MR for automatic shutdown reset. |
| 6 NC | No Connect | Unbonded pin; must remain unconnected per datasheet; no electrical function or internal connection. |
| 7 RESET | Active-Low Reset Output | Push-pull output asserted low for 200 ms during power-up/brownout; remains valid down to VCC = 1 V. |
| 8 RESET | Active-High Reset Output | Inverted complement of pin 7; enables direct interface to processors requiring active-high reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Polarity Reset Outputs | Simultaneous RESET (active low) and RESET (active high) eliminate need for external inverters in mixed-logic systems. |
| Guaranteed Reset Below 1 V VCC | Ensures microprocessor remains held in reset until power fully collapses, preventing erratic operation during undervoltage decay. |
| Integrated Power-Fail Comparator | 1.25 V reference enables precise low-battery detection or auxiliary rail monitoring without external components. |
| Debounced Manual Reset Input | 70 µA internal pull-up and 200 ms timeout prevent false resets from switch bounce or transient noise on MR line. |
| Industrial Temperature Range | −40°C to +85°C operation supports deployment in harsh environments including industrial controllers and automotive ECUs. |
Applications
| Industrial PLC I/O Modules | Portable Medical Sensors |
|---|---|
Use Scenario: Monitoring 3 V supply rails in programmable logic controller backplane modules subject to load transients and EMI. IC Role / Device Role / Timing Role: Supervisory IC providing synchronized active-low and active-high reset signals to FPGA and ARM Cortex-M microcontrollers during brownout events. Use Value: Dual-reset outputs ensure deterministic initialization across heterogeneous logic families without signal inversion delays or component count increase. | Use Scenario: Battery-powered glucose meters and pulse oximeters requiring reliable low-voltage shutdown before data corruption occurs. IC Role / Device Role / Timing Role: Voltage supervisor generating reset pulses and triggering PFO interrupt for graceful firmware save-and-shutdown when battery drops below 2.8 V. Use Value: 1.25 V PFI threshold enables accurate battery voltage scaling via 2-resistor divider, extending usable runtime while preserving measurement integrity. |
| Smart Energy Meters | Point-of-Sale Terminals |
Use Scenario: Utility-grade electricity meters exposed to wide ambient temperature swings and grid voltage sags. IC Role / Device Role / Timing Role: Primary reset generator with MR input tied to tamper-detection switch and PFO linked to backup supercapacitor monitoring. Use Value: −40°C to +85°C rating and 200 ms reset pulse guarantee robust startup under cold-start and brownout conditions per IEC 62053 standards. | Use Scenario: Retail payment terminals using 3 V microcontrollers and EEPROMs that require clean reset sequencing during AC power loss. IC Role / Device Role / Timing Role: Supervisory circuit asserting both RESET and RESET to coordinate processor, display driver, and secure element initialization. Use Value: Simultaneous dual-output assertion eliminates race conditions between subsystems, reducing boot-time failures in field-deployed units. |
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 2.93 V threshold, dual-reset outputs, and PFI/PFO functionality; differs only in SOIC-8 (R-8) package instead of PDIP-8 (N-8). | Suitable for surface-mount production; requires PCB redesign for footprint and reflow profile vs. through-hole ADM708SANZ. | Select ADM708SARZ for automated assembly; retain ADM708SANZ for prototyping, repair, or legacy through-hole designs. |
| MAX708SCSA+ | Pin-compatible 8-pin SOIC alternative with identical 2.93 V threshold and dual-reset outputs; lacks guaranteed RESET validity below 1.2 V VCC. | Acceptable where brownout depth is shallow; unsuitable for ultra-low-VCC hold requirements like battery cutoff at 1.0 V. | Choose MAX708SCSA+ only if board layout and thermal constraints favor Maxim's package; verify VCC collapse behavior matches system safety margin. |
Compared with ADM708SARZ and MAX708SCSA+, ADM708SANZ uniquely combines PDIP-8 manufacturability, guaranteed 1 V reset validity, and dual-output flexibility-making it optimal for industrial control prototypes and field-serviceable equipment where mechanical robustness and deep brownout resilience are critical.
Availability
ADM708SANZ is available at Aetrix Electronics and suitable for industrial PLC I/O modules, portable medical sensors, smart energy meters, and point-of-sale terminals requiring stable component supply with long-term lifecycle assurance.
Supply support for ADM708SANZ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The ADM708 series belongs to Analog Devices' microprocessor supervisory product line, designed specifically for deterministic reset generation, power-fail warning, and manual reset integration in 3 V embedded systems without watchdog overhead.
FAQ
What is the reset threshold voltage of the ADM708SANZ?
The ADM708SANZ has a nominal reset threshold voltage of 2.93 V, with a tolerance of ±0.08 V (2.85 V to 3.00 V). This value is factory-trimmed and specified over the full industrial temperature range (−40°C to +85°C). The threshold is used to detect brownout conditions on the 3 V supply rail, and the device asserts both RESET and RESET outputs when VCC falls below this level. The ADM708SANZ does not support adjustable thresholds - it is a fixed 2.93 V variant within the ADM708 family.
Does the ADM708SANZ include a watchdog timer function?
No, the ADM708SANZ does not include a watchdog timer. It is explicitly differentiated from the ADM706x series by the omission of the WDI (watchdog input) and WDO (watchdog output) pins and associated circuitry. Instead, ADM708SANZ provides dual-reset outputs (RESET and RESET) and a dedicated power-fail comparator (PFI/PFO). This makes ADM708SANZ appropriate for applications where software-level supervision is handled externally or where deterministic reset timing without watchdog dependency is preferred.
What package type is used for the ADM708SANZ?
The ADM708SANZ uses an 8-lead narrow-body plastic dual in-line package (PDIP), designated N-8 per JEDEC MS-001. It features a 0.300-inch body width, 0.100-inch lead pitch, and through-hole mounting. This package is distinct from the SOIC-8 (R-8) variant ADM708SARZ. The "ANZ" suffix in ADM708SANZ explicitly denotes the PDIP-8 package with industrial temperature grade (−40°C to +85°C).
How does the power-fail comparator (PFI/PFO) operate in the ADM708SANZ?
The ADM708SANZ power-fail comparator compares the voltage at the PFI pin against an internal 1.25 V reference. When PFI falls below 1.25 V, the open-drain PFO output pulls low, signaling a power-fail or low-battery condition. PFI is intended to be driven by a resistor divider from an auxiliary supply or battery. If unused, PFI must be connected to GND. The comparator operates independently of the main VCC monitor and supports hysteresis addition via external feedback resistor between PFO and PFI for improved noise immunity.
Can the ADM708SANZ generate a valid reset signal when VCC drops below 1.2 V?
Yes, the ADM708SANZ guarantees valid RESET and RESET output states down to VCC = 1.0 V, as confirmed in the datasheet's Absolute Maximum Ratings and Typical Performance Characteristics. This ensures the microprocessor remains held in reset during deep brownout or battery depletion scenarios. Below 1.0 V, internal drive capability degrades; for applications requiring continued low-VCC assertion, an external pull-down resistor on RESET is recommended per Figure 19 in the datasheet.
ADM708SANZ 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:
- 2.93V
- 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
ADM708SANZ FAQ
1.How can I place an order for ADM708SANZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708SANZ 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 ADM708SANZ reliable?
The price and inventory of ADM708SANZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708SANZ is usually 5 days.
3.What payment methods are accepted for ADM708SANZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708SANZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708SANZ?
ADM708SANZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708SANZ 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 ADM708SANZ?
For technical support, including ADM708SANZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708SANZ requirements.
6.How does Aetrix verify that ADM708SANZ is sourced from the original manufacturer or authorized distributors?
All ADM708SANZ 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 ADM708SANZ meets industry standards.
7.What is the process for return or replacement of ADM708SANZ?
All ADM708SANZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM708SANZ, 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 ADM708SANZ part is unused and in its original packaging.
Return procedure for ADM708SANZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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