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Analog Devices Inc. ADM708ARZ-REEL
- Part No.:
- ADM708ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM708ARZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,291
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Product details
Overview
ADM708ARZ-REEL from Analog Devices is a precision 5 V microprocessor supervisory circuit with active-high reset output, 4.40 V supply voltage monitor threshold, 200 ms reset pulse width, 190 μA quiescent current, and power-fail comparator (PFI/PFO) for low-battery or preregulator monitoring in embedded control systems.
For engineers reviewing the ADM708ARZ-REEL datasheet, ADM708ARZ-REEL pinout, ADM708ARZ-REEL application, or ADM708ARZ-REEL equivalent, key selection criteria include guaranteed RESET validity down to 1 V VCC, TTL/CMOS-compatible debounced manual reset input (MR), absence of watchdog timer, SOIC-8 packaging, and compatibility with bidirectional reset lines via external current-limiting resistor.
Technical Context
The ADM708ARZ-REEL implements a precision bandgap-based voltage reference (1.25 V) for PFI comparator operation and a separate 4.40 V reset threshold detector with 40 mV hysteresis. Its internal reset generator holds RESET high for 200 ms after VCC rises above threshold or MR deasserts, ensuring reliable power-on initialization.
Unlike ADM705/ADM706 variants, ADM708ARZ-REEL omits watchdog timer circuitry (no WDI/WDO pins) and provides dual reset outputs: active-low RESET and active-high RESET - enabling direct interface with processors requiring either polarity without external inversion logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40 V ±0.15 V - triggers reset during brownout when 5 V rail drops below safe operating level |
| Reset Pulse Width | 200 ms typical - ensures sufficient time for microprocessor core and peripherals to stabilize post-power-up |
| Quiescent Current | 190 μA - enables long-term battery-backed operation in low-power monitoring applications |
| Valid RESET Down to VCC | 1 V - guarantees reset assertion remains valid during deep undervoltage conditions, preventing premature release |
| Power-Fail Comparator Threshold | 1.25 V - allows configurable monitoring of auxiliary supplies (e.g., 3.3 V, 12 V) via resistive divider on PFI pin |
| MR Input Pull-Up Current | 250 μA typical - eliminates need for external pull-up resistor when interfacing with open-drain or mechanical switches |
| RESET Output Drive | 800 μA source / 1.2 mA sink - supports direct connection to standard CMOS/TTL inputs without buffering |
Pinout & Package
ADM708ARZ-REEL is housed in an 8-lead SOIC_N (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch, 4.90 mm × 3.90 mm body size, and gull-wing leads. Thermal impedance θJA = 110°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | TTL/CMOS-compatible debounced input; internally pulled up at 250 μA; asserts reset when driven below 0.8 V |
| 2 (VCC) | Power Supply Input | 5 V nominal supply; 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 be low-impedance |
| 4 (PFI) | Power-Fail Input | Noninverting input to 1.25 V comparator; monitors auxiliary supply via external resistive divider |
| 5 (PFO) | Power-Fail Output | Open-drain active-low output signaling PFI < 1.25 V; can interrupt processor or trigger shutdown sequence |
| 6 (NC) | No Connect | Internally unconnected; must remain floating or tied to GND (not VCC) |
| 7 (RESET) | Active-Low Reset Output | Push-pull output asserted low during reset condition; compatible with legacy microprocessors requiring active-low reset |
| 8 (RESET) | Active-High Reset Output | Inverted complement of pin 7; directly drives processors with active-high reset architecture (e.g., ARM Cortex-M series) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous active-low and active-high RESET signals eliminate need for external inverters in mixed-architecture systems |
| Guaranteed 1 V reset validity | Ensures deterministic reset hold-down even during severe brownout or battery depletion, preventing runaway states |
| Integrated power-fail comparator | Enables early-warning detection of falling auxiliary rails (e.g., 3.3 V I/O supply) using only two external resistors on PFI |
| Debounced manual reset input | 250 μA internal pull-up and 200 ms timeout suppress switch bounce and transient glitches without external RC network |
| SOIC-8 RoHS-compliant packaging | R-8 footprint supports automated assembly and reflow soldering; REEL packaging enables high-volume SMT production |
Applications
| Industrial PLC Controller Monitoring | Medical Infusion Pump Power Supervision |
|---|---|
Use Scenario: Continuous monitoring of 5 V system rail and 3.3 V logic supply in programmable logic controller backplane. IC Role / Device Role / Timing Role: ADM708ARZ-REEL generates synchronized active-high RESET pulse on power-up and asserts PFO interrupt if 3.3 V rail drops below 3.0 V (via 10 kΩ/2.2 kΩ PFI divider). Use Value: Prevents firmware corruption during unstable power transitions and enables graceful I/O module shutdown before main CPU resets. | Use Scenario: Battery-backed safety-critical subsystem where main 5 V rail and backup lithium coin-cell voltage must be validated prior to motor activation. IC Role / Device Role / Timing Role: ADM708ARZ-REEL monitors primary 5 V supply with 4.40 V threshold and uses PFI to detect coin-cell voltage decay below 2.7 V (via 1 MΩ/470 kΩ divider), triggering PFO-driven alert. Use Value: Provides fail-safe power validation independent of MCU firmware, satisfying IEC 62304 Class C requirement for hardware-enforced power integrity. |
| Automotive Body Control Module (BCM) | Network Router Power Sequencing |
Use Scenario: Supervising 5 V microcontroller supply in automotive BCM exposed to load-dump and cold-crank transients. IC Role / Device Role / Timing Role: ADM708ARZ-REEL's 1 V reset validity ensures RESET remains asserted during cold-crank events (VCC dips to 1.2 V), while MR accepts wake-up signal from CAN transceiver. Use Value: Eliminates need for external undervoltage lockout (UVLO) circuitry, reducing BOM count and PCB area in space-constrained modules. | Use Scenario: Coordinating startup of 5 V CPU core and 3.3 V PHY interface in enterprise-grade Ethernet router. IC Role / Device Role / Timing Role: ADM708ARZ-REEL's RESET output holds CPU in reset until both 5 V rail stabilizes and PFO confirms 3.3 V rail is within tolerance (via PFI divider), enforcing strict power sequencing. Use Value: Prevents PHY initialization failures caused by out-of-spec voltage ramp rates, reducing field returns related to link negotiation errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX692AESA+ | 4.63 V reset threshold, no active-high RESET output, 12 μA quiescent current, SOIC-8 | Lacks dual-reset polarity; optimized for ultra-low-power battery monitoring rather than 5 V system supervision | Select when lowest possible supply current is critical and active-high reset is not required. |
| TPS3808G33DBVR | 3.3 V fixed reset threshold, 1.8 μA quiescent current, SOT-23-6, no PFI/PFO or dual-reset outputs | Designed for single-rail 3.3 V systems; lacks power-fail comparator and manual reset input | Select for cost-sensitive 3.3 V applications where auxiliary supply monitoring is unnecessary. |
Compared with MAX692AESA+ and TPS3808G33DBVR, ADM708ARZ-REEL uniquely delivers 4.40 V threshold, dual-polarity reset, and PFI/PFO capability in SOIC-8 - making it the only option among the three suitable for 5 V systems requiring coordinated power-fail warning and bidirectional reset compatibility.
Availability
ADM708ARZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, medical infusion pumps, automotive body control modules, network routers, and critical microprocessor supply monitoring requiring stable component supply across extended temperature ranges.
Supply support for ADM708ARZ-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, Inc. is a global semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADM70x family was designed specifically for robust, low-cost microprocessor supervision in industrial, medical, and automotive environments where reliable power-on reset, brownout protection, and auxiliary supply monitoring are mandatory.
FAQ
What is the reset threshold voltage for ADM708ARZ-REEL and how is it used in system design?
The ADM708ARZ-REEL has a nominal reset threshold of 4.40 V with ±0.15 V tolerance. This value defines the minimum 5 V supply voltage at which the device releases its RESET outputs, ensuring the microprocessor only exits reset when the rail is sufficiently stable. In practice, this threshold prevents spurious resets during marginal power conditions and aligns with common 5 V regulator dropout specifications. The 40 mV hysteresis avoids oscillation near the trip point.
Does ADM708ARZ-REEL include a watchdog timer function?
No, ADM708ARZ-REEL does not include a watchdog timer. It belongs to the ADM707/ADM708 subgroup, which omits the WDI and WDO pins present in ADM705/ADM706 variants. Instead, ADM708ARZ-REEL provides dedicated active-low and active-high RESET outputs plus PFI/PFO functionality for power-fail monitoring - making it ideal for applications requiring deterministic reset behavior without software-dependent supervision.
How does the power-fail comparator (PFI/PFO) in ADM708ARZ-REEL operate?
The PFI pin connects to the noninverting input of an internal 1.25 V comparator; when the voltage at PFI falls below 1.25 V, the open-drain PFO output pulls low. This allows monitoring of any auxiliary supply (e.g., 3.3 V, 12 V) using a simple resistive divider. For example, a 10 kΩ/2.2 kΩ divider on a 3.3 V rail yields ~0.6 V at PFI - so PFO asserts when the rail drops below ~2.8 V. Unused PFI must be tied to GND.
Can ADM708ARZ-REEL drive a microprocessor reset pin directly without external components?
Yes, ADM708ARZ-REEL can drive most microprocessor reset pins directly. Its RESET outputs provide 800 μA source and 1.2 mA sink capability - sufficient for standard CMOS/TTL inputs. However, for bidirectional reset lines (e.g., some ARM processors), a 4.7 kΩ current-limiting resistor between ADM708ARZ-REEL's RESET and the processor pin is recommended to prevent contention during reset assertion/release transitions.
What package type and compliance status does ADM708ARZ-REEL have?
ADM708ARZ-REEL is supplied in an 8-lead SOIC_N (R-8) package compliant with JEDEC MS-012-AA, featuring gull-wing leads and RoHS-compliant (lead-free) construction. The "Z" suffix denotes RoHS compliance, and "REEL" indicates tape-and-reel packaging optimized for automated SMT assembly. Thermal resistance θJA is 110°C/W, supporting operation across the full −40°C to +85°C industrial temperature range.
ADM708ARZ-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:
- 4.4V
- 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
ADM708ARZ-REEL FAQ
1.How can I place an order for ADM708ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708ARZ-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 ADM708ARZ-REEL reliable?
The price and inventory of ADM708ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708ARZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM708ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708ARZ-REEL?
ADM708ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708ARZ-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 ADM708ARZ-REEL?
For technical support, including ADM708ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708ARZ-REEL requirements.
6.How does Aetrix verify that ADM708ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM708ARZ-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 ADM708ARZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM708ARZ-REEL?
All ADM708ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM708ARZ-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 ADM708ARZ-REEL part is unused and in its original packaging.
Return procedure for ADM708ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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