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Analog Devices Inc. ADM708SARZ-REEL
- Part No.:
- ADM708SARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM708SARZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,529
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Product details
Overview
ADM708SARZ-REEL from Analog Devices is a 3 V microprocessor supervisory circuit with dual active-high/active-low reset outputs, 2.93 V precision voltage monitoring threshold, 200 ms reset pulse width, and power-fail warning capability via PFI/PFO. It ensures reliable system initialization and brownout recovery in embedded controllers and battery-powered instruments.
For engineers reviewing the ADM708SARZ-REEL datasheet, ADM708SARZ-REEL pinout, ADM708SARZ-REEL application, or ADM708SARZ-REEL equivalent, key selection criteria include its dual-reset output architecture, guaranteed RESET validity down to 1 V VCC, 1.25 V power-fail comparator reference, internal MR debouncing, and SOIC-8 packaging for space-constrained PCB layouts.
Technical Context
The ADM708SARZ-REEL implements a precision bandgap-based voltage monitor with 2.93 V ±70 mV threshold and 20 mV hysteresis, ensuring stable reset assertion during supply ramp-up and brownout. Its dual-reset outputs (RESET and RESET) support bidirectional or mixed-logic microprocessor interfaces without external buffering.
It integrates a dedicated 1.25 V reference comparator for power-fail detection (PFI/PFO), enabling early-warning shutdown sequencing. Unlike the ADM706x series, it omits watchdog timer circuitry-simplifying design where software supervision is handled externally or unnecessary.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V ±0.07 V - precisely monitors 3 V supplies; triggers reset before microprocessor operational failure. |
| Reset Pulse Width | 200 ms typical - provides sufficient time for power supply and CPU stabilization after power-on or recovery. |
| Supply Current | 100 µA typical at VCC < 3.6 V - enables long battery life in portable instrumentation. |
| PFI Threshold | 1.25 V ±0.05 V - allows configurable power-fail detection of auxiliary rails using external resistor dividers. |
| VCC Validity Range | 1.0 V to 5.5 V - RESET remains asserted and valid even as VCC collapses to 1 V, preventing metastability. |
| Output Drive | VOH = 0.8×VCC / VOL = 0.3 V @ ISINK = 500 µA - compatible with 3 V CMOS/TTL logic families without level-shifting. |
Pinout & Package
ADM708SARZ-REEL is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch and 5.00 mm × 4.00 mm body dimensions. Pin 1 is marked by a beveled corner or dot.
| 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 pulled below 0.6 V. |
| 2 VCC | Power Supply Input | Primary supply rail (1.0–5.5 V); requires 0.1 µF decoupling capacitor to GND for noise immunity. |
| 3 GND | Ground Reference | Common return path for all analog and digital functions; must connect to system ground plane. |
| 4 PFI | Power-Fail Input | Noninverting input to 1.25 V comparator; monitors auxiliary supply via resistor divider; tie to GND if unused. |
| 5 PFO | Power-Fail Output | Active-low open-drain output signaling PFI < 1.25 V; used for early-warning interrupt or secondary reset generation. |
| 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 | Inverted complement of pin 7; supports systems requiring active-high reset assertion without external inverters. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals eliminate need for external inverters in mixed-logic systems. |
| Guaranteed reset validity at 1 V VCC | Ensures deterministic processor hold-down during full supply collapse-critical for data integrity in battery backup scenarios. |
| Configurable power-fail warning | 1.25 V PFI comparator enables precise early-warning shutdown of non-critical subsystems before main supply failure. |
| Internal MR debouncing | 200 ms debounce window rejects mechanical switch bounce and EMI-induced glitches on manual reset lines. |
| SOIC-8 footprint compatibility | Standard R-8 package enables drop-in replacement in existing 3 V supervisory designs without layout revision. |
Applications
| Industrial PLC Controllers | Portable Medical Instruments |
|---|---|
Use Scenario: Monitoring 3 V logic supply in programmable logic controller I/O modules subject to field-induced voltage transients. IC Role / Device Role / Timing Role: Voltage supervisor generating synchronized reset pulses to ARM Cortex-M7 MCU and FPGA configuration logic during brownout events. Use Value: Prevents corrupted I/O state transitions by holding processors in reset until VCC stabilizes above 2.93 V for ≥200 ms. | Use Scenario: Power management in handheld ECG analyzers powered by single-cell Li-ion batteries with declining discharge curve. IC Role / Device Role / Timing Role: Dual-reset supervisor interfacing with ultra-low-power MSP430 MCU; PFI monitors battery voltage via divider to trigger graceful shutdown at 3.2 V. Use Value: Extends usable battery runtime by enabling controlled data save and display blanking before brownout-induced crash. |
| Network Edge Routers | Smart Energy Meters |
Use Scenario: Ensuring deterministic boot sequence in multi-rail PoE-powered edge routers with isolated 3.3 V management domain. IC Role / Device Role / Timing Role: Supervising primary 3.3 V management rail while using PFO to assert NMI on ARM-based SoC for firmware-level power-event logging. Use Value: Enables accurate timestamped power-failure event capture for remote diagnostics and grid reliability analytics. | Use Scenario: Tamper-resistant reset control in ANSI C12.22-compliant electricity meters with backup supercapacitor and real-time clock. IC Role / Device Role / Timing Role: Providing fail-safe reset to metering ASIC and RTC during mains dropout; RESET holds RTC in known state while PFO triggers capacitor charge management. Use Value: Guarantees uninterrupted timekeeping and secure metering data retention across >10,000 power cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708SUR+T | Same 2.93 V reset threshold, 200 ms timeout, and dual-reset outputs; but uses different PFI reference (1.24 V) and lacks guaranteed 1 V VCC operation. | Valid for cost-sensitive industrial controls where 1 V reset validity is not required; not recommended for battery-backed RTC applications. | Select MAX708SUR+T only if legacy Maxim footprint compatibility is mandatory and sub-1.2 V VCC behavior is outside design scope. |
| TPS3808G33DBVR | Single active-low reset output; 3.08 V threshold (not 2.93 V); 200 ms timeout; includes enable input and adjustable delay option. | Suitable for new designs prioritizing TI ecosystem integration and adjustable timing; cannot replace dual-output requirement without adding discrete inverter. | Choose TPS3808G33DBVR when redesigning for flexibility in reset timing or when active-high reset is implemented separately. |
Compared with MAX708SUR+T and TPS3808G33DBVR, ADM708SARZ-REEL uniquely delivers guaranteed reset validity down to 1 V VCC and true dual complementary outputs in a single SOIC-8 package-making it irreplaceable in battery-fail-safe and bidirectional-reset architectures.
Availability
ADM708SARZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical instruments, network edge routers, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM708SARZ-REEL 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 precision instrumentation, industrial automation, and communications markets.
The ADM708 series belongs to Analog Devices' microprocessor supervisory product line, engineered specifically for deterministic power-on reset, brownout protection, and power-fail warning in 3 V embedded systems with stringent reliability requirements.
FAQ
What is the exact reset threshold voltage of the ADM708SARZ-REEL?
The ADM708SARZ-REEL has a nominal reset threshold of 2.93 V, with a guaranteed range of 2.85 V to 3.00 V over temperature and supply variations. This value is laser-trimmed at wafer test and specified in Table 1 of the Rev. E datasheet under "Reset Threshold (VRST)" for ADM708S devices. The threshold applies to both RESET and RESET outputs simultaneously.
Does the ADM708SARZ-REEL include a watchdog timer function?
No, the ADM708SARZ-REEL does not include a watchdog timer. Unlike the ADM706x family, the ADM708x series replaces watchdog circuitry with dual complementary reset outputs (RESET and RESET). The functional block diagram in Figure 14 confirms absence of WDI and WDO pins-pin 6 is designated NC (No Connect), and no watchdog timing specifications appear in the ADM708S parameter tables.
How does the ADM708SARZ-REEL handle power-fail detection?
The ADM708SARZ-REEL uses an internal 1.25 V reference comparator connected to the PFI pin. When the voltage at PFI falls below 1.25 V (±0.05 V), the PFO output goes low. Designers configure PFI with an external resistor divider from a monitored supply rail; this enables early-warning shutdown before main VCC drops below the 2.93 V reset threshold.
Can the ADM708SARZ-REEL operate reliably when VCC drops below 2 V?
Yes-the ADM708SARZ-REEL guarantees valid RESET and RESET output states down to VCC = 1.0 V, as confirmed in the General Description (Page 1) and Absolute Maximum Ratings (Page 5). This ensures the microprocessor remains held in reset during deep brownout conditions, preventing undefined instruction execution or memory corruption.
What is the purpose of the NC pin (Pin 6) on the ADM708SARZ-REEL?
Pin 6 on the ADM708SARZ-REEL is designated NC (No Connect) and is internally unconnected. It must remain electrically floating-no external component or trace should attach to it. This pin distinguishes the ADM708SARZ-REEL from the ADM706SARZ-REEL (which uses Pin 6 for WDI) and reflects the removal of watchdog functionality in the ADM708 family.
ADM708SARZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ADM708SARZ-REEL FAQ
1.How can I place an order for ADM708SARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708SARZ-REEL 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 ADM708SARZ-REEL reliable?
The price and inventory of ADM708SARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708SARZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM708SARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708SARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708SARZ-REEL?
ADM708SARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708SARZ-REEL 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 ADM708SARZ-REEL?
For technical support, including ADM708SARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708SARZ-REEL requirements.
6.How does Aetrix verify that ADM708SARZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM708SARZ-REEL 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 ADM708SARZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM708SARZ-REEL?
All ADM708SARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM708SARZ-REEL, 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 ADM708SARZ-REEL part is unused and in its original packaging.
Return procedure for ADM708SARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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