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Analog Devices Inc. ADM708RAR
- Part No.:
- ADM708RAR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM708RAR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,153
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Product details
Overview
ADM708RAR from Analog Devices is a 3 V microprocessor supervisory circuit with dual active-high/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-up/brownout reset control.
For engineers reviewing the ADM708RAR datasheet, ADM708RAR pinout, ADM708RAR application, or ADM708RAR equivalent, key selection criteria include guaranteed RESET validity down to 1 V VCC, debounced manual reset input (MR), absence of watchdog timer (distinguishing it from ADM706R), and SOIC-8 packaging for space-constrained PCB layouts.
Technical Context
The ADM708RAR implements a precision voltage monitor with fixed 2.63 V reset threshold and hysteresis of 20 mV, ensuring stable reset assertion during supply ramp-up and brownout recovery. Its dual-reset architecture provides both RESET (active low) and RESET (active high) outputs simultaneously, eliminating need for external inverters in bidirectional reset systems.
It integrates a dedicated 1.25 V reference-based power-fail comparator (PFI/PFO) for early warning of supply collapse, with PFO asserting low when PFI falls below 1.25 V. Unlike ADM706-series variants, ADM708RAR omits watchdog timer circuitry - confirmed by absence of WDI and WDO pins and explicit functional block diagram differentiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V ±0.08 V - triggers reset when VCC drops below this level; matches 3 V system rails with margin for noise and drift. |
| Reset Pulse Width | 200 ms typical - ensures microprocessor completes power stabilization before release from reset state. |
| Supply Current | 100–200 µA at VCC < 3.6 V - enables long battery life in portable instruments and low-power embedded nodes. |
| PFI Threshold | 1.25 V ±0.05 V - sets precise trip point for external resistive divider to monitor auxiliary supplies or preregulator inputs. |
| RESET Validity | Guaranteed down to VCC = 1 V - maintains valid logic level on RESET/RESET outputs during deep brownout, preventing metastability. |
| Operating Temp | −40°C to +85°C - supports industrial-grade deployment in automotive ECUs, PLCs, and field-deployed sensors. |
Pinout & Package
ADM708RAR 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 beveled corner or dot; device is not pin-compatible with ADM706R due to NC placement and missing WDO/WDI functions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Debounced manual reset input | Internally pulled up with 70 µA; accepts TTL/CMOS logic or switch closure; initiates 200 ms reset pulse when pulled <0.6 V. |
| 2 VCC | Power supply input | Accepts 2.7–5.5 V; requires 0.1 µF decoupling capacitor to GND for noise immunity during reset assertion. |
| 3 GND | Ground reference | Common return path for all internal circuits and output drivers; must connect to system ground plane. |
| 4 PFI | Power-fail comparator input | Noninverting input referenced to 1.25 V; monitors external supply via resistor divider; tie to GND if unused. |
| 5 PFO | Power-fail comparator output | Active-low open-drain output; asserts low when PFI < 1.25 V; can drive MR or interrupt line directly. |
| 6 NC | No-connect terminal | Not bonded internally; must remain unconnected on PCB; no routing or copper pour allowed. |
| 7 RESET | Active-low reset output | Push-pull driver; sinks 1.2 mA at VOL ≤ 0.3 V (VCC < 3.6 V); holds microprocessor in reset until VCC > 2.63 V + hysteresis. |
| 8 RESET | Active-high reset output | Complementary push-pull output; sources 500 µA at VOH ≥ 0.8×VCC; eliminates need for external inverter in legacy designs. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals eliminate external logic inversion and reduce BOM count. |
| 1 V reset validity | Ensures deterministic reset hold-down even as VCC collapses below 1.5 V - critical for fail-safe shutdown in battery-backed systems. |
| Debounced MR input | 200 ms internal timing eliminates mechanical switch bounce without external RC network or firmware polling. |
| 1.25 V PFI comparator | Enables precise, temperature-stable monitoring of secondary supplies (e.g., backup rail, sensor bias) using simple resistor dividers. |
| Industrial temp range | −40°C to +85°C operation validated across full voltage range - suitable for under-hood automotive, factory-floor, and outdoor IoT deployments. |
Applications
| Industrial PLC Controller | Battery-Powered Data Logger |
|---|---|
Use Scenario: Monitors 3.3 V main supply and 3.0 V backup rail in programmable logic controller with real-time I/O scanning. IC Role / Device Role / Timing Role: Supervisory IC providing synchronized reset to CPU, FPGA, and communication peripherals during cold start and brownout events. Use Value: Dual RESET/RESET outputs interface natively with mixed-logic microcontrollers; PFO-driven MR ensures backup rail failure triggers immediate safe state entry. | Use Scenario: Powers remote environmental sensor node operating on Li-SOCl₂ primary cell with 10-year shelf life. IC Role / Device Role / Timing Role: Voltage supervisor enabling ultra-low-quiescent-current sleep mode while guaranteeing clean wake-up and brownout recovery. Use Value: 100 µA supply current extends battery life; 1 V reset validity prevents erratic behavior during end-of-life voltage sag; MR allows firmware-triggered graceful shutdown. |
| Medical Infusion Pump | Smart Energy Meter |
Use Scenario: Ensures deterministic startup and fault recovery in Class II medical device with isolated 3.3 V logic and motor driver rails. IC Role / Device Role / Timing Role: Safety-critical reset generator with dual outputs driving separate reset domains for MCU and safety monitor ASIC. Use Value: Guaranteed 200 ms reset pulse meets IEC 62304 power-on timing requirements; PFI monitors isolated DC-DC converter output for early overvoltage/undervoltage detection. | Use Scenario: Monitors 3.3 V microcontroller supply and 5.0 V metrology ADC rail in ANSI C12.20-compliant electricity meter. IC Role / Device Role / Timing Role: Dual-rail supervisor providing independent reset assertion and power-fail interrupt to enable secure data flush before capacitor hold-up expires. Use Value: PFO-to-MR feedback loop ensures loss of metrology rail triggers immediate nonvolatile memory save; SOIC-8 footprint fits tight meter PCB layout constraints. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM706RAR | Includes watchdog timer (WDI/WDO), single active-low RESET output, identical 2.63 V threshold and SOIC-8 package. | Required where software hang detection is mandatory; unsuitable if board lacks WDI routing or needs active-high reset. | Select ADM706RAR only when watchdog functionality is required and dual-reset outputs are unnecessary. |
| TPS3808G12DBVR | TI part with 1.2 V threshold, adjustable reset delay, 2.5 µA quiescent current, SOT-23-6 package - no PFI/PFO or dual-reset capability. | Optimized for ultra-low-power wearables; lacks power-fail warning and complementary reset outputs needed for industrial control. | Choose TPS3808G12DBVR only for cost-sensitive, space-constrained, single-rail battery apps where PFI and dual reset are irrelevant. |
Compared with ADM706RAR, ADM708RAR trades watchdog capability for dual-reset flexibility and simplified layout; versus TPS3808G12DBVR, it delivers industrial-grade PFI monitoring and deterministic 200 ms reset timing at higher quiescent current - making it optimal for mission-critical 3 V systems requiring fail-safe supervision.
Availability
ADM708RAR is available at Aetrix Electronics and suitable for industrial PLC controllers, battery-powered data loggers, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM708RAR 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 robust power monitoring and reset generation in 3 V/3.3 V embedded systems where reliability, low-voltage operation, and dual-output flexibility are essential.
FAQ
What is the reset threshold voltage of the ADM708RAR?
The ADM708RAR has a precision reset threshold of 2.63 V, with a tolerance of ±0.08 V (2.55 V to 2.70 V). This value is factory-trimmed and remains stable over temperature and supply voltage variations, making it suitable for monitoring nominal 3 V rails with sufficient margin against noise and droop. The ADM708RAR uses the same 2.63 V threshold as the ADM706R and ADM706P variants but differs in output configuration and lack of watchdog functionality.
Does the ADM708RAR include a watchdog timer function?
No, the ADM708RAR does not include a watchdog timer. Unlike the ADM706R series, it omits WDI (watchdog input) and WDO (watchdog output) pins - confirmed by its pinout (Pin 6 = NC) and functional block diagram. This simplifies design for applications where software hang detection is handled externally or is unnecessary, reducing routing complexity and eliminating potential watchdog timeout conflicts in deterministic real-time systems.
How does the ADM708RAR support bidirectional reset lines on microprocessors?
The ADM708RAR supports bidirectional reset lines by providing both active-high (RESET) and active-low (RESET) outputs simultaneously. This eliminates contention risk when interfacing with microprocessors that drive reset during normal operation. A 4.7 kΩ current-limiting resistor is recommended between either output and the MCU reset pin, per Analog Devices' Application Note. The dual outputs allow direct connection without external inverters or level shifters, preserving signal integrity and reducing component count.
Can the ADM708RAR monitor a second power supply?
Yes, the ADM708RAR can monitor a second supply using its PFI (power-fail input) and PFO (power-fail output) pins. By connecting an external resistive divider from the auxiliary supply to PFI, the internal 1.25 V comparator detects when that supply falls below the threshold. PFO can then assert low to trigger a system interrupt or be tied to MR to generate a hardware reset. This capability is explicitly documented in Figure 22 of the ADM708R datasheet and validated across the −40°C to +85°C range.
What package type is used for the ADM708RAR?
The ADM708RAR is supplied in an 8-lead SOIC_N (small outline integrated circuit, narrow body) package, designated R-8 per JEDEC MS-012-AA. It measures 5.00 mm × 4.00 mm with 1.27 mm lead pitch and gull-wing leads. This surface-mount package supports automated assembly and offers better thermal performance and smaller footprint than the PDIP variant (ADM708RANZ), making it ideal for compact industrial and portable electronics.
ADM708RAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
ADM708RAR FAQ
1.How can I place an order for ADM708RAR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708RAR 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 ADM708RAR reliable?
The price and inventory of ADM708RAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708RAR is usually 5 days.
3.What payment methods are accepted for ADM708RAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708RAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708RAR?
ADM708RAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708RAR 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 ADM708RAR?
For technical support, including ADM708RAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708RAR requirements.
6.How does Aetrix verify that ADM708RAR is sourced from the original manufacturer or authorized distributors?
All ADM708RAR 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 ADM708RAR meets industry standards.
7.What is the process for return or replacement of ADM708RAR?
All ADM708RAR units undergo pre-shipment inspection (PSI). If there is an issue with ADM708RAR, 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 ADM708RAR part is unused and in its original packaging.
Return procedure for ADM708RAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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