My Inquiry
My Account
Analog Devices Inc. ADM708TAR-REEL
- Part No.:
- ADM708TAR-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM708TAR-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,958
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADM708TAR-REEL from Analog Devices is a 3.08 V precision microprocessor supervisory circuit in an 8-lead SOIC package, providing dual active-high and active-low reset outputs, 200 ms reset pulse width, 100 µA quiescent current, and 1.25 V power-fail comparator for low-battery warning in 3 V embedded systems.
For engineers reviewing the ADM708TAR-REEL datasheet, ADM708TAR-REEL pinout, ADM708TAR-REEL application, or ADM708TAR-REEL equivalent, this page delivers verified reset threshold (3.08 V), dual-reset output polarity, PFI/PFO monitoring capability, MR debouncing, and industrial temperature range (−40°C to +85°C) - all critical for reliable microcontroller power-up sequencing and brownout recovery.
Technical Context
The ADM708TAR-REEL implements a precision voltage monitor with fixed 3.08 V reset threshold and 20 mV hysteresis, ensuring stable reset assertion during 3 V supply ramp-up and brownout. Its dual-reset architecture (RESET and RESET) supports bidirectional microprocessor reset lines without contention.
It integrates a dedicated 1.25 V power-fail comparator (PFI/PFO) for early-warning detection of supply collapse or battery depletion, and features a debounced manual reset input (MR) with 70 µA internal pull-up - eliminating external RC networks while maintaining TTL/CMOS compatibility.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V ±0.08 V - precisely triggers reset when 3 V supply drops below operational minimum, enabling robust brownout protection. |
| Reset Pulse Width | 200 ms typical - guarantees sufficient hold time for microprocessor initialization and clock stabilization after power-up or recovery. |
| Quiescent Current | 100 µA at VCC < 3.6 V - enables long-term operation in battery-powered instruments without significant drain. |
| Power-Fail Threshold | 1.25 V ±0.05 V - allows accurate monitoring of auxiliary supplies or battery voltage via resistive divider on PFI pin. |
| Operating Temp Range | −40°C to +85°C - qualified for industrial-grade embedded control, portable instrumentation, and automotive body electronics. |
| VCC Validity Limit | 1 V minimum - ensures RESET remains asserted down to near-dead-battery conditions, preventing undefined MCU state. |
| Output Drive Strength | VOH = 0.8×VCC / VOL = 0.3 V @ ISINK = 500 µA - directly interfaces with 3 V logic families without level-shifting. |
Pinout & Package
ADM708TAR-REEL is housed in an 8-lead narrow SOIC (R-8) package per JEDEC MS-012-AA, with 1.27 mm pitch, 5.00 mm × 4.00 mm body, and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | Debounced TTL/CMOS-compatible input; internally pulled up with 70 µA; asserts reset when driven below 0.6 V. |
| 2 (VCC) | Power Supply Input | Primary 3 V–5.5 V supply rail; requires 0.1 µF decoupling capacitor to GND for noise immunity. |
| 3 (GND) | Ground Reference | Common 0 V reference for all analog and digital functions; must be low-impedance connection. |
| 4 (PFI) | Power-Fail Input | Noninverting input to 1.25 V comparator; monitors auxiliary supply/battery via external resistor divider. |
| 5 (PFO) | Power-Fail Output | Active-low open-drain output signaling PFI < 1.25 V; used for NMI or system shutdown initiation. |
| 6 (NC) | No Connect | Unbonded pin; must remain unconnected and floating - no routing or termination permitted. |
| 7 (RESET) | Active-Low Reset Output | Push-pull output asserted low for 200 ms during power-up, brownout, or MR activation; valid down to VCC = 1 V. |
| 8 (RESET) | Active-High Reset Output | Inverted complement of pin 7; enables direct interface with processors requiring active-high reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-Polarity Reset Outputs | Simultaneous RESET (active low) and RESET (active high) eliminate need for external inverters in mixed-logic systems. |
| Guaranteed Reset Below 1 V VCC | Ensures microprocessor remains held in reset until supply collapses fully - prevents erratic behavior during battery depletion. |
| Integrated Power-Fail Comparator | 1.25 V reference with PFI/PFO pins enables early warning of supply decay without adding discrete comparators. |
| Debounced Manual Reset | Internal 200 ms timing eliminates external RC filter components and switch bounce issues in pushbutton reset circuits. |
| Industrial Temperature Rating | −40°C to +85°C operation supports deployment in harsh environments including factory automation and outdoor instrumentation. |
Applications
| Industrial PLC I/O Modules | Portable Medical Monitors |
|---|---|
Use Scenario: Monitoring 3.3 V CPU core supply and 5 V I/O rail in programmable logic controller backplanes subject to voltage sag during relay switching. IC Role / Device Role / Timing Role: Supervisory IC asserting dual-reset signals to ARM Cortex-M7 processor and FPGA configuration logic during brownout events. Use Value: Prevents firmware corruption and I/O latch-up by holding both processor and programmable logic in known state for full 200 ms after supply recovery. | Use Scenario: Battery-backed ECG data logger operating from single-cell Li-ion (3.0–4.2 V) with low-voltage shutdown requirement at 3.2 V. IC Role / Device Role / Timing Role: Voltage monitor using PFI divider to detect battery drop to 3.2 V, triggering PFO interrupt for graceful data save and sleep entry. Use Value: Enables >98% usable battery capacity utilization while guaranteeing safe shutdown before brownout-induced memory loss. |
| Smart Energy Meters | Ruggedized Handheld Test Equipment |
Use Scenario: Dual-supply metering SoC (3.3 V core, 5 V RS-485 transceiver) exposed to utility grid transients and cold-temperature startup. IC Role / Device Role / Timing Role: Primary reset supervisor asserting synchronized RESET/RESET to SoC and isolated comms interface during AC line dropout. Use Value: Eliminates communication lockup and metering drift by enforcing deterministic restart of both processing and physical layers. | Use Scenario: Field-deployed oscilloscope with FPGA-based acquisition engine and flash storage, powered by removable LiPo pack. IC Role / Device Role / Timing Role: Brownout detector and manual reset manager interfacing with FPGA's dual-edge-sensitive reset input. Use Value: Supports bidirectional reset line via series 4.7 kΩ resistor, preventing contention while enabling hardware-triggered calibration reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708TESA+ | 3.08 V reset threshold, same dual-reset outputs and PFI/PFO, but higher quiescent current (120 µA typ) and no guaranteed reset below 1 V. | Lacks sub-1 V reset validity - unsuitable for deep battery discharge scenarios requiring fail-safe hold-down. | Select ADM708TAR-REEL where extended low-VCC reset assertion is mandatory for safety-critical shutdown. |
| TPS3808G33DBVR | 3.3 V reset threshold (±0.5%), single active-low reset, no PFI/PFO, 1.8 µA quiescent current, but includes watchdog timer. | Missing power-fail comparator and dual-reset outputs - requires additional components for equivalent functionality. | Choose ADM708TAR-REEL when PFI-based early warning and bidirectional reset support are required without added BOM cost. |
Compared with MAX708TESA+ and TPS3808G33DBVR, ADM708TAR-REEL uniquely combines 3.08 V precision monitoring, dual-reset polarity, integrated 1.25 V power-fail detection, and guaranteed 1 V reset validity - making it optimal for 3 V industrial and portable systems demanding comprehensive supply supervision without design compromises.
Availability
ADM708TAR-REEL is available at Aetrix Electronics and suitable for industrial PLCs, portable medical devices, smart energy meters, and ruggedized test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM708TAR-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, communications, automotive, and healthcare markets since 1965.
The ADM708 series belongs to Analog Devices' microprocessor supervisory product line, engineered specifically for deterministic power-up sequencing, brownout recovery, and supply integrity monitoring in 3 V embedded systems.
FAQ
What is the exact reset threshold voltage of the ADM708TAR-REEL?
The ADM708TAR-REEL has a nominal reset threshold of 3.08 V, with a guaranteed range of 3.00 V to 3.15 V at TA = −40°C to +85°C. This value is factory-trimmed and specified in Table 1 of the Rev. E datasheet under "Reset Threshold (VRST)" for ADM706T/ADM708T variants. It is optimized for 3 V supply monitoring and provides 20 mV hysteresis to prevent chatter during slow-rising or noisy rails.
Does the ADM708TAR-REEL include a watchdog timer function?
No, the ADM708TAR-REEL does not include a watchdog timer. Unlike the ADM706x family, the ADM708R/S/T series replaces the WDI/WDO watchdog circuitry with a second reset output (RESET). Pin 6 is designated NC (No Connect), and functional block diagrams confirm absence of watchdog logic. For watchdog capability, engineers must select ADM706TAR-REEL or add external supervision.
How does the ADM708TAR-REEL handle power-fail detection?
The ADM708TAR-REEL uses an internal 1.25 V reference connected to the noninverting input of a comparator, with the PFI pin serving as the inverting input. When voltage at PFI falls below 1.25 V - typically set via external resistor divider from a monitored supply - the PFO output goes low. This enables early-warning interrupts for battery depletion or pre-regulator failure, and PFO can drive MR to trigger system reset if needed.
Can the ADM708TAR-REEL operate with supply voltages below 3 V?
Yes, the ADM708TAR-REEL operates with VCC from 3.15 V to 5.5 V per datasheet specifications, but its RESET outputs remain valid down to VCC = 1 V. While the device does not *function* (i.e., monitor or assert reset) below 3.15 V, the reset outputs stay asserted low (RESET) or high (RESET) until VCC reaches ~1 V, ensuring safe MCU hold-down during final battery collapse - a key differentiator versus competitors.
What package type and lead count does the ADM708TAR-REEL use?
The ADM708TAR-REEL uses an 8-lead narrow-body SOIC package (JEDEC MS-012-AA, Analog Devices R-8 option), with 1.27 mm lead pitch, 5.00 mm × 4.00 mm body dimensions, and gull-wing surface-mount leads. The "-REEL" suffix indicates tape-and-reel packaging for automated SMT assembly, and the part is RoHS-compliant and Pb-free.
ADM708TAR-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:
- 3.08V
- 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
ADM708TAR-REEL FAQ
1.How can I place an order for ADM708TAR-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708TAR-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 ADM708TAR-REEL reliable?
The price and inventory of ADM708TAR-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708TAR-REEL is usually 5 days.
3.What payment methods are accepted for ADM708TAR-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708TAR-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708TAR-REEL?
ADM708TAR-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708TAR-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 ADM708TAR-REEL?
For technical support, including ADM708TAR-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708TAR-REEL requirements.
6.How does Aetrix verify that ADM708TAR-REEL is sourced from the original manufacturer or authorized distributors?
All ADM708TAR-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 ADM708TAR-REEL meets industry standards.
7.What is the process for return or replacement of ADM708TAR-REEL?
All ADM708TAR-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM708TAR-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 ADM708TAR-REEL part is unused and in its original packaging.
Return procedure for ADM708TAR-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM708TAR-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…
