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Analog Devices Inc. ADM708RARZ-REEL
- Part No.:
- ADM708RARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM708RARZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:6,491
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Product details
Overview
ADM708RARZ-REEL from Analog Devices is a 3 V microprocessor supervisory circuit with dual active-high and active-low reset outputs, 2.63 V reset threshold, 200 ms reset pulse width, and power-fail monitoring via 1.25 V PFI comparator - used in embedded controllers and battery-powered instrumentation for reliable power-on/brownout reset and early low-supply warning.
For engineers reviewing the ADM708RARZ-REEL datasheet, ADM708RARZ-REEL pinout, ADM708RARZ-REEL application, or ADM708RARZ-REEL equivalent, key selection criteria include dual-reset polarity support, guaranteed RESET validity down to 1 V VCC, debounced manual reset input, and compatibility with 3 V/3.3 V systems requiring fail-safe microprocessor supervision without watchdog functionality.
Technical Context
The ADM708RARZ-REEL implements a precision voltage monitor with fixed 2.63 V reset threshold and hysteresis of 20 mV, enabling stable detection of 3 V supply brownouts. 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 systems.
It integrates a dedicated 1.25 V power-fail comparator with PFI/PFO interface for early warning of supply decay, and features a debounced MR input with 70 µA internal pull-up - all operating with quiescent current ≤100 µA at VCC < 3.6 V and valid reset assertion down to VCC = 1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V ±70 mV - precisely monitors 3 V supplies for brownout and ensures reset assertion before logic corruption occurs. |
| Reset Pulse Width | 200 ms typical - provides sufficient hold time for microprocessor power-up stabilization and firmware initialization. |
| Supply Current | 100 µA max at VCC < 3.6 V - enables long battery life in portable and low-power embedded systems. |
| PFI Threshold | 1.25 V ±50 mV - supports configurable early power-fail detection using external resistor divider on monitored rail. |
| Valid RESET Down to | VCC = 1 V - guarantees controlled shutdown even during deep undervoltage conditions. |
| MR Input Pull-Up | 70 µA typical - allows direct connection of mechanical switches without external biasing components. |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade deployment in harsh environmental conditions. |
Pinout & Package
ADM708RARZ-REEL is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch, 5.00 mm × 4.00 mm body, and gull-wing leads. Pin 1 is marked by notch or dot; device is not pin-compatible with ADM706-series due to NC placement and dual-reset output configuration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | Debounced TTL/CMOS-compatible input; asserted low (<0.6 V) triggers both RESET and RESET outputs for system-initiated reset. |
| 2 (VCC) | Power Supply Input | Primary supply rail (2.7–5.5 V); requires local 0.1 µF decoupling to GND for noise immunity and timing stability. |
| 3 (GND) | Ground Reference | Common return path for all internal circuits and output drivers; must be low-impedance connection to system ground plane. |
| 4 (PFI) | Power-Fail Input | Noninverting input to 1.25 V comparator; monitors auxiliary supply via resistive divider for predictive shutdown signaling. |
| 5 (PFO) | Power-Fail Output | Active-low open-drain output indicating PFI < 1.25 V; can drive interrupt lines or be tied to MR for automatic reset on supply decay. |
| 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 after VCC rise above 2.63 V or MR assertion; sinks up to 1.2 mA at 0.3 V. |
| 8 (RESET) | Active-High Reset Output | Complementary push-pull output asserted high for 200 ms under same trigger conditions; sources up to 500 µA at 0.8×VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Polarity Reset Outputs | Simultaneous RESET (active low) and RESET (active high) eliminate need for external level-shifting or inversion in mixed-logic systems. |
| Guaranteed Reset Below 1 V VCC | Ensures deterministic microprocessor hold state during deep undervoltage events, preventing undefined behavior or latch-up. |
| Debounced Manual Reset Input | 70 µA internal pull-up and 200 ms timeout suppress switch bounce, removing requirement for RC filters or firmware debouncing. |
| Configurable Power-Fail Detection | 1.25 V PFI threshold with PFO output enables user-defined early-warning thresholds for any supply rail using two-resistor scaling. |
| Industrial Temperature Range | −40°C to +85°C operation supports deployment in automotive ECUs, industrial PLCs, and outdoor telemetry equipment. |
Applications
| Industrial Controller Monitoring | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Supervising 3 V MCU in programmable logic controller with redundant power rails and watchdog-free operation. IC Role / Device Role / Timing Role: Primary reset supervisor generating synchronized active-high and active-low reset signals during cold start, brownout, and MR-triggered recovery. Use Value: Eliminates external reset logic while ensuring deterministic reset timing across temperature and supply variations. | Use Scenario: Enabling graceful shutdown in handheld multimeter when main Li-ion cell drops below 3.0 V. IC Role / Device Role / Timing Role: Voltage monitor and early power-fail detector using PFI/PFO to initiate data save and display blanking before supply collapse. Use Value: Extends usable battery capacity by triggering shutdown at precise 3.0 V threshold rather than waiting for brownout-induced reset. |
| Embedded System Power Sequencing | Microprocessor-Based Data Logger |
Use Scenario: Coordinating startup sequence between 3.3 V core and 1.8 V I/O rails in FPGA-based edge node. IC Role / Device Role / Timing Role: Reset generator asserting both polarities to satisfy multiple downstream ICs with differing reset input requirements. Use Value: Removes need for discrete inverters or dual-supervisor ICs, reducing BOM count and PCB area. | Use Scenario: Ensuring reliable boot and runtime supervision in solar-powered environmental sensor node with intermittent 3 V supply. IC Role / Device Role / Timing Role: Brownout detector and MR interface providing 200 ms reset hold time and PFO-driven interrupt for low-power sleep entry. Use Value: Prevents corrupted flash writes and sensor read errors during marginal supply conditions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708RCSA+ | Same 2.63 V threshold, dual-reset outputs, and PFI/PFO; higher quiescent current (120 µA typ), no 1 V reset guarantee. | Lacks guaranteed RESET validity below 1.2 V VCC - unsuitable for ultra-low-voltage brownout hold requirements. | Select MAX708RCSA+ only if legacy footprint compatibility with Maxim designs is required and sub-1.2 V operation is not needed. |
| TPS3808G12DBVR | Adjustable reset threshold (via external resistor), single active-low reset, no PFI/PFO, lower IQ (1.5 µA), but no dual-output or power-fail comparator. | Cannot replace ADM708RARZ-REEL in systems requiring simultaneous active-high/low reset or predictive power-fail signaling. | Choose TPS3808G12DBVR only for cost-sensitive, low-IQ applications where dual reset and PFI are unnecessary. |
Compared with MAX708RCSA+, ADM708RARZ-REEL offers superior undervoltage robustness (1 V vs. 1.2 V reset validity); compared with TPS3808G12DBVR, it delivers integrated dual-reset polarity and power-fail warning - critical for fault-tolerant embedded control where coordinated reset and early shutdown are mandatory.
Availability
ADM708RARZ-REEL is available at Aetrix Electronics and suitable for industrial controllers, battery-powered instrumentation, and microprocessor-based data loggers requiring stable component supply, long-term lifecycle support, and guaranteed performance across −40°C to +85°C.
Supply support for ADM708RARZ-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 industrial, automotive, communications, and healthcare markets with precision signal chain solutions.
The ADM708 series belongs to Analog Devices' microprocessor supervisory product line, designed specifically for robust, low-power reset and power-fail monitoring in 3 V/3.3 V embedded systems without watchdog complexity.
FAQ
What is the reset threshold voltage of the ADM708RARZ-REEL?
The ADM708RARZ-REEL has a fixed reset threshold of 2.63 V, with ±70 mV tolerance over temperature and supply. This value is factory-trimmed and applies to both RESET and RESET outputs. It is optimized for reliable supervision of nominal 3 V power rails, ensuring reset assertion before logic-level violations occur during brownout conditions. The ADM708RARZ-REEL does not support adjustable thresholds.
Does the ADM708RARZ-REEL include a watchdog timer function?
No, the ADM708RARZ-REEL does not include a watchdog timer. Unlike the ADM706-series, it omits the WDI and WDO pins entirely - confirmed by its pinout (Pin 6 = NC) and functional block diagram. Its role is strictly voltage monitoring and reset generation. Systems requiring watchdog supervision must use a separate timer IC or select an ADM706 variant instead of the ADM708RARZ-REEL.
How does the ADM708RARZ-REEL handle power-fail detection?
The ADM708RARZ-REEL uses a dedicated 1.25 V comparator with PFI (Pin 4) and PFO (Pin 5) to enable user-configurable power-fail detection. By connecting a resistive divider from a monitored supply to PFI, designers set a custom trip point - e.g., 5 V supply fails when PFI falls below 1.25 V. PFO asserts low to signal the event and can drive an interrupt or be tied to MR for automatic reset. No external reference or op amp is needed.
Can the ADM708RARZ-REEL operate with supply voltages below 3 V?
Yes, the ADM708RARZ-REEL operates from VCC = 2.7 V to 5.5 V per datasheet specifications, and its RESET outputs remain valid down to VCC = 1 V - a key differentiator. This ensures the microprocessor stays held in reset during deep undervoltage transients. However, the 2.63 V reset threshold means reliable brownout detection begins only when VCC rises above ~2.55 V, consistent with its specified hysteresis window.
What is the purpose of the NC pin on the ADM708RARZ-REEL?
Pin 6 on the ADM708RARZ-REEL is designated NC (No Connect) and is internally unconnected. It must remain floating - no external component or trace should connect to this pin. This distinguishes the ADM708RARZ-REEL from the ADM706-series, which uses Pin 6 for WDI. The NC pin reflects the absence of watchdog functionality and confirms the device's simplified supervisory role focused solely on reset and power-fail monitoring.
ADM708RARZ-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:
- 2.63V
- 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
ADM708RARZ-REEL FAQ
1.How can I place an order for ADM708RARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708RARZ-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 ADM708RARZ-REEL reliable?
The price and inventory of ADM708RARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708RARZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM708RARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708RARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708RARZ-REEL?
ADM708RARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708RARZ-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 ADM708RARZ-REEL?
For technical support, including ADM708RARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708RARZ-REEL requirements.
6.How does Aetrix verify that ADM708RARZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM708RARZ-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 ADM708RARZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM708RARZ-REEL?
All ADM708RARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM708RARZ-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 ADM708RARZ-REEL part is unused and in its original packaging.
Return procedure for ADM708RARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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