My Inquiry
My Account
Analog Devices Inc. ADM708AR-REEL
- Part No.:
- ADM708AR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM708AR-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,806
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADM708AR-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, and power-fail comparator (PFI/PFO). It ensures reliable system initialization and brownout protection in embedded controllers and industrial instrumentation where stable reset assertion below 1 V VCC is required.
For engineers reviewing the ADM708AR-REEL datasheet, ADM708AR-REEL pinout, ADM708AR-REEL application, or ADM708AR-REEL equivalent, key selection criteria include its guaranteed RESET validity down to 1 V, 190 μA quiescent current, absence of watchdog timer (distinguishing it from ADM706), dual reset polarity support via RESET/RESET, and SOIC_N package compatibility with standard PCB assembly processes.
Technical Context
The ADM708AR-REEL implements a fixed 4.40 V precision voltage monitor with 40 mV hysteresis to detect VCC brownout conditions and trigger a 200 ms active-high RESET signal. Its internal 1.25 V reference enables independent power-fail detection via the PFI input, driving PFO low when external supply voltage drops below threshold.
No watchdog timer is integrated-unlike ADM705/ADM706-making ADM708AR-REEL suitable for systems requiring only supply monitoring and manual reset (MR) functionality. The MR input is TTL/CMOS-compatible, internally debounced, and pulled up with 250 μA to ensure noise-immune reset initiation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40 V ±0.15 V - triggers reset during 5 V supply brownout; matches ADM706/ADM708 family specification |
| Reset Pulse Width | 200 ms typical - provides sufficient time for microprocessor power stabilization after power-up or recovery |
| Quiescent Current | 190 μA typical - enables low-power operation in battery-backed or energy-sensitive systems |
| VCC Validity Range | 1.0 V to 5.5 V - guarantees functional RESET output even during deep undervoltage ramp-up or shutdown |
| Power-Fail Comparator | 1.25 V threshold at PFI - allows monitoring of secondary supplies or preregulator inputs via resistive divider |
| Manual Reset Input | Debounced, 0.8 V logic-low threshold - accepts direct switch or logic-level assertion without external RC filtering |
| Reset Output Polarity | Active-high RESET and active-low RESET - supports bidirectional or legacy processor reset interface requirements |
Pinout & Package
ADM708AR-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, and gull-wing leads. Pin 1 marked with notch or bevel; device operates over −40°C to +85°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | TTL/CMOS-compatible debounced input; asserted low <0.8 V to generate reset; internally pulled up with 250 μA |
| 2 (VCC) | Power Supply Input | 5 V nominal supply input; requires 0.1 μF decoupling capacitor to GND for noise immunity |
| 3 (GND) | Ground Reference | 0 V return path for all internal circuits and I/O; must be low-impedance connection |
| 4 (PFI) | Power-Fail Input | Noninverting input to 1.25 V comparator; monitors external supply via resistor divider; connect to GND if unused |
| 5 (PFO) | Power-Fail Output | Open-drain active-low output; asserts when PFI < 1.25 V; can interrupt MCU or drive external logic |
| 6 (NC) | No Connect | Internally unconnected; must remain floating or tied to GND (not VCC) |
| 7 (RESET) | Active-High Reset Output | Push-pull output; goes high for 200 ms on power-up/brownout/MR assertion; valid down to 1 V VCC |
| 8 (RESET) | Active-Low Reset Output | Inverted complement of RESET; supports processors requiring active-low reset signaling |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET below 1 V VCC | Ensures deterministic microprocessor hold-down during full power-rail collapse, eliminating risk of undefined state |
| Dual-polarity reset outputs | Simultaneous RESET (active-high) and RESET (active-low) eliminate need for external inverters in mixed-logic systems |
| Integrated power-fail comparator | 1.25 V reference + PFI/PFO enables early warning of supply degradation before main VCC dropout |
| Debounced manual reset input | 250 μA internal pull-up and 200 ms timing eliminates need for external debounce circuitry or software polling |
| Low quiescent current | 190 μA operation extends battery life in portable or backup-supply applications without sacrificing supervision accuracy |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
|
Use Scenario: Monitors 5 V logic rail in programmable logic controller during factory floor voltage fluctuations and EMI events. IC Role / Device Role / Timing Role: Supervisory IC providing brownout-triggered active-high RESET to ARM Cortex-M7 core and active-low RESET to FPGA configuration logic. Use Value: Prevents firmware corruption by holding processors in reset until VCC stabilizes above 4.40 V with 200 ms delay, while PFO alerts firmware of auxiliary 12 V supply decay. |
Use Scenario: Ensures safe shutdown sequence in ultrasound imaging system when main 5 V DC-DC converter exhibits slow transient response. IC Role / Device Role / Timing Role: Voltage supervisor asserting RESET on VCC dip and generating PFO interrupt to initiate data save and hardware isolation before power loss. Use Value: 1 V operational limit guarantees reset remains asserted through complete power collapse, preventing partial writes to flash memory or sensor calibration registers. |
| Smart Energy Meter | Automotive Body Control Module |
|
Use Scenario: Provides supply monitoring for metrology SoC and secure element in ANSI C12.22-compliant electricity meter with battery backup. IC Role / Device Role / Timing Role: Dual-threshold supervisor detecting both main 5 V rail failure and backup battery depletion via PFI divider network. Use Value: 4.40 V reset threshold aligns with Li-ion battery discharge curve; 190 μA quiescent current minimizes drain on 10-year backup cell. |
Use Scenario: Manages reset sequencing for CAN-enabled microcontroller and LIN transceivers in door module exposed to automotive load-dump transients. IC Role / Device Role / Timing Role: Primary supervisor asserting RESET during cranking-induced 5 V sag; PFO feeds diagnostic ECU to log undervoltage events. Use Value: 40 mV hysteresis prevents chatter during marginal VCC recovery; MR input accepts wake-up signal from key fob RF receiver. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM706AR-REEL | Includes watchdog timer (1.60 s timeout); same 4.40 V reset threshold; active-low RESET only | Required where software hang detection is needed; lacks active-high RESET output | Select ADM706AR-REEL only if watchdog functionality is mandatory and active-high reset is not required |
| MAX708RCSA+ | Pin-compatible Maxim replacement; 4.40 V threshold; 200 ms reset; includes watchdog but no PFO | Used in legacy designs migrating from MAXIM; lacks power-fail comparator output | Choose MAX708RCSA+ only for drop-in replacement in existing MAX708 layouts where PFO is unused |
Compared with ADM708AR-REEL, ADM706AR-REEL adds watchdog capability at the cost of losing active-high reset and PFO functionality, while MAX708RCSA+ offers pin compatibility but omits the critical power-fail comparator needed for predictive supply monitoring.
Availability
ADM708AR-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, smart energy meters, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM708AR-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 leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide.
The ADM705–ADM708 family was engineered specifically for robust 5 V microprocessor supply monitoring in industrial, medical, and communications equipment where deterministic reset behavior under brownout and power-fail conditions is mission-critical.
FAQ
What is the reset threshold voltage for ADM708AR-REEL?
The ADM708AR-REEL has a precision reset threshold of 4.40 V, with a tolerance of ±0.15 V (4.25 V to 4.50 V). This value is factory-trimmed and specified over the full industrial temperature range (−40°C to +85°C). The threshold applies to both power-up and brownout detection, and the device guarantees valid RESET output even when VCC drops as low as 1 V.
Does ADM708AR-REEL include a watchdog timer function?
No, ADM708AR-REEL does not include a watchdog timer. It belongs to the ADM707/ADM708 subgroup, which omits the watchdog circuitry present in ADM705/ADM706. Instead, ADM708AR-REEL provides dual reset outputs (active-high RESET and active-low RESET) and a dedicated power-fail comparator (PFI/PFO) for auxiliary supply monitoring.
What package type is used for ADM708AR-REEL?
ADM708AR-REEL is supplied in an 8-lead Standard Small Outline Package (SOIC_N), also designated R-8 per JEDEC MS-012-AA. It features a 1.27 mm lead pitch, 4.90 mm × 3.90 mm body size, and gull-wing leads. The "-REEL" suffix indicates tape-and-reel packaging for automated SMT assembly.
How does the power-fail comparator (PFI/PFO) work in ADM708AR-REEL?
The PFI input connects to the noninverting terminal of an internal comparator referenced to a precise 1.25 V bandgap voltage. When the voltage at PFI falls below 1.25 V, the open-drain PFO output pulls low. This allows monitoring of secondary supplies (e.g., 12 V, 3.3 V) using an external resistor divider. If unused, PFI must be tied to GND to prevent floating node issues.
Can ADM708AR-REEL operate with supply voltages below 5 V?
Yes, ADM708AR-REEL operates over a VCC range of 1.0 V to 5.5 V. Its reset function remains fully specified and guaranteed down to 1.0 V, enabling reliable hold-down during deep undervoltage conditions. However, the 4.40 V reset threshold is calibrated for nominal 5 V systems; operation at lower nominal rails (e.g., 3.3 V) requires verification of threshold margin against actual supply tolerances.
ADM708AR-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:
- Obsolete
- 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
ADM708AR-REEL FAQ
1.How can I place an order for ADM708AR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708AR-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 ADM708AR-REEL reliable?
The price and inventory of ADM708AR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708AR-REEL is usually 5 days.
3.What payment methods are accepted for ADM708AR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708AR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708AR-REEL?
ADM708AR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708AR-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 ADM708AR-REEL?
For technical support, including ADM708AR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708AR-REEL requirements.
6.How does Aetrix verify that ADM708AR-REEL is sourced from the original manufacturer or authorized distributors?
All ADM708AR-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 ADM708AR-REEL meets industry standards.
7.What is the process for return or replacement of ADM708AR-REEL?
All ADM708AR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM708AR-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 ADM708AR-REEL part is unused and in its original packaging.
Return procedure for ADM708AR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM708AR-REEL Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
