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Analog Devices Inc. ADM708RARZ
- Part No.:
- ADM708RARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM708RARZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:582
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Product details
Overview
ADM708RARZ 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 and brownout reset assertion.
For engineers reviewing the ADM708RARZ datasheet, ADM708RARZ pinout, ADM708RARZ application, or ADM708RARZ equivalent, this page delivers verified functional identity, SOIC-8 package mapping, reset timing behavior, PFI/PFO interface details, and validated alternative options for 3 V system supervision without watchdog functionality.
Technical Context
The ADM708RARZ implements dual-reset logic (RESET and RESET) driven by a precision 2.63 V voltage monitor with 20 mV hysteresis and guaranteed validity down to VCC = 1 V. Its internal power-fail comparator uses a fixed 1.25 V reference on the PFI input to generate early-warning PFO assertions.
No watchdog timer is present - unlike ADM706R variants - making ADM708RARZ suitable for systems requiring deterministic reset control without activity monitoring. The MR input is debounced internally and pulls up with 70 µA, supporting direct TTL/CMOS or mechanical switch interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V ±70 mV - sets precise power-on/brownout detection point for 3 V rails |
| Reset Pulse Width | 200 ms typical - ensures microprocessor stabilization after power recovery |
| Supply Current | 100 µA typical at VCC < 3.6 V - enables long battery life in portable instruments |
| PFI Threshold | 1.25 V ±50 mV - enables configurable power-fail warning using external resistor divider |
| VCC Operating Range | 2.7 V to 5.5 V - supports operation across 3 V and 3.3 V supply domains |
| Reset Output Drive | VOH ≥ 0.8×VCC / VOL ≤ 0.3 V at ISINK = 500 µA - compatible with standard CMOS inputs |
| Operating Temperature | −40°C to +85°C - qualified for industrial embedded environments |
Pinout & Package
ADM708RARZ 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/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | Debounced TTL/CMOS-compatible input; pulled high internally with 70 µA; asserts reset when < 0.6 V |
| 2 (VCC) | Power Supply Input | Primary supply rail connection; requires 0.1 µF decoupling capacitor to GND |
| 3 (GND) | Ground Reference | Common 0 V reference for all analog and digital functions |
| 4 (PFI) | Power-Fail Input | Noninverting input to 1.25 V comparator; monitors auxiliary supply via resistive divider |
| 5 (PFO) | Power-Fail Output | Open-drain output asserting low when PFI < 1.25 V; used for early shutdown signaling |
| 6 (NC) | No Connect | Unbonded pin; must remain unconnected per datasheet |
| 7 (RESET) | Active-Low Reset Output | Push-pull output asserted low for 200 ms during power-up, brownout, or MR activation |
| 8 (RESET) | Active-High Reset Output | Inverted complement of pin 7; provides simultaneous compatibility with bidirectional or active-high reset microprocessors |
Key Features
| Feature | Design Value |
|---|---|
| Dual active-high and active-low reset outputs | Eliminates need for external inverters in systems with mixed reset polarity requirements |
| Guaranteed RESET validity down to VCC = 1 V | Ensures processor remains held in reset during full power collapse and recovery |
| 1.25 V precision power-fail comparator (PFI/PFO) | Enables configurable early-warning detection of secondary supply failure or battery depletion |
| Internally debounced manual reset (MR) | Removes need for external RC filtering or firmware debounce logic |
| SOIC_N (R-8) package with industrial temperature range | Supports automated assembly and operation in harsh environmental conditions |
Applications
| Industrial Controller Supervision | Battery-Powered Instrumentation |
|---|---|
Use Scenario: Monitoring 3 V supply in programmable logic controllers during mains interruption or brownout events. IC Role / Device Role / Timing Role: Voltage supervisor asserting both RESET and RESET to hold CPU and peripheral ICs in known state until stable power resumes. Use Value: Prevents corrupted register writes and undefined state transitions during unstable supply conditions. | Use Scenario: Detecting end-of-life battery voltage drop in handheld test equipment before data loss occurs. IC Role / Device Role / Timing Role: PFI input monitors battery via resistor divider; PFO triggers controlled shutdown sequence prior to critical undervoltage. Use Value: Enables safe flash memory write completion and volatile RAM backup before power exhaustion. |
| Embedded Microprocessor Reset Management | Power-Fail Warning in Medical Devices |
Use Scenario: Providing synchronized reset assertion to ARM Cortex-M microcontrollers in medical diagnostic modules. IC Role / Device Role / Timing Role: Dual-reset outputs interface directly with bidirectional reset pins using current-limiting resistor per datasheet Figure 23. Use Value: Avoids bus contention while ensuring deterministic reset timing across heterogeneous SoC peripherals. | Use Scenario: Monitoring auxiliary 5 V DC-DC converter output in patient-monitoring hardware. IC Role / Device Role / Timing Role: PFI senses converter output; PFO interrupts MCU to initiate alarm and data preservation routines. Use Value: Meets IEC 60601-1 requirement for fail-safe response to power subsystem faults. |
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 reset threshold, 200 ms timeout, dual reset outputs, but uses 100 µA max quiescent current vs. ADM708RARZ's 100 µA typical; no PFI hysteresis option | Compatible in pinout and function for 3 V systems; lacks integrated PFI hysteresis network support | Select MAX708RCSA+ only if sourcing from Maxim Integrated is preferred and PFI noise immunity is managed externally |
| TPS3808G33DBVR | Single active-low reset output, 3.3 V threshold (not 2.63 V), 200 ms delay, 1.6 µA quiescent current - significantly lower power but different voltage trip point | Suitable for 3.3 V-only systems where ultra-low power dominates over dual-reset flexibility | Choose TPS3808G33DBVR only when redesign accommodates single-reset polarity and higher threshold; not drop-in |
Compared with MAX708RCSA+, ADM708RARZ offers superior PFI hysteresis configurability and tighter reset threshold tolerance; compared with TPS3808G33DBVR, ADM708RARZ provides dual-reset capability and precise 2.63 V trip essential for legacy 3 V microcontroller compatibility.
Availability
ADM708RARZ is available at Aetrix Electronics and suitable for industrial controller supervision, battery-powered instrumentation, embedded microprocessor reset management, and power-fail warning in medical devices requiring stable component supply across extended production lifecycles.
Supply support for ADM708RARZ 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 since 1965.
The ADM708 series belongs to Analog Devices' microprocessor supervisory product line, engineered specifically for robust, low-power, dual-polarity reset generation and power-fail warning in 3 V embedded systems.
FAQ
What is the reset threshold voltage of the ADM708RARZ?
The ADM708RARZ has a nominal reset threshold voltage of 2.63 V, with a specified tolerance of ±70 mV. This value is factory-trimmed and guaranteed over the full industrial temperature range (−40°C to +85°C). It is designed to reliably detect brownout conditions on 3 V supply rails, and the ADM708RARZ maintains valid reset assertion even as VCC drops to 1 V.
Does the ADM708RARZ include a watchdog timer function?
No, the ADM708RARZ does not include a watchdog timer. Unlike the ADM706R series, the ADM708RARZ omits the WDI and WDO pins entirely - pin 6 is designated NC (No Connect), and the functional block diagram confirms absence of watchdog circuitry. Its role is strictly voltage monitoring, manual reset, and power-fail warning.
How are the two reset outputs (RESET and RESET) used in practice?
The ADM708RARZ provides both active-low (pin 7) and active-high (pin 8) reset outputs simultaneously. This allows direct interface with microprocessors that require either polarity - for example, connecting RESET to an ARM core and RESET to a companion FPGA or peripheral ASIC. Per datasheet Figure 23, a 4.7 kΩ current-limiting resistor is recommended when driving bidirectional reset pins to prevent contention.
What is the purpose of the PFI and PFO pins on the ADM708RARZ?
The PFI (Power-Fail Input) pin connects to a resistor divider monitoring an auxiliary supply or battery voltage; when PFI falls below 1.25 V, the PFO (Power-Fail Output) pin asserts low. This provides early warning of impending power loss, enabling the host microprocessor to execute controlled shutdown, save state, or trigger alarms - independent of the main VCC reset function.
Is the ADM708RARZ pin-compatible with other ADM708 variants like ADM708SARZ or ADM708TARZ?
Yes, all ADM708xARZ variants share identical SOIC_N (R-8) pinout and package dimensions. They differ only in reset threshold voltage: ADM708RARZ = 2.63 V, ADM708SARZ = 2.93 V, ADM708TARZ = 3.08 V. Functionally, all provide dual reset outputs and PFI/PFO - making them direct replacements when board-level voltage tolerance permits.
ADM708RARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for ADM708RARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708RARZ 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 reliable?
The price and inventory of ADM708RARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708RARZ is usually 5 days.
3.What payment methods are accepted for ADM708RARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708RARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708RARZ?
ADM708RARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708RARZ 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?
For technical support, including ADM708RARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708RARZ requirements.
6.How does Aetrix verify that ADM708RARZ is sourced from the original manufacturer or authorized distributors?
All ADM708RARZ 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 meets industry standards.
7.What is the process for return or replacement of ADM708RARZ?
All ADM708RARZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM708RARZ, 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 part is unused and in its original packaging.
Return procedure for ADM708RARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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