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Analog Devices Inc. ADM708TAR
- Part No.:
- ADM708TAR
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM708TAR.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,003
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Product details
Overview
ADM708TAR 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 datasheet, ADM708TAR pinout, ADM708TAR application, or ADM708TAR equivalent, this device supports critical reset supervision in battery-powered instruments, industrial controllers, and microprocessor systems requiring guaranteed RESET validity down to 1 V VCC and robust manual reset debouncing.
Technical Context
The ADM708TAR implements a dual-output reset generator with independent voltage monitoring at 3.08 V threshold and hysteresis of 20 mV, ensuring reliable power-up and brownout detection. Its internal 1.25 V reference powers a dedicated PFI/PFO comparator for early power-fail warning without watchdog functionality.
Unlike the ADM706x series, the ADM708TAR omits the watchdog timer and WDI/WDO pins, instead allocating Pins 6 and 7 to complementary RESET and RESET outputs. It retains MR debouncing, PFI input with ±25 nA leakage, and guaranteed reset assertion down to VCC = 1 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V ±0.08 V - precisely monitors 3 V supply rails with defined trip point for stable system initialization |
| Reset Pulse Width | 200 ms typical - ensures sufficient processor stabilization time after power-up or brownout recovery |
| Quiescent Current | 100 µA at VCC < 3.6 V - enables long battery life in portable instrumentation and low-power embedded systems |
| Power-Fail Comparator Threshold | 1.25 V ±0.05 V - supports accurate low-battery detection or auxiliary supply monitoring via external resistor divider |
| RESET Validity Range | Operational down to VCC = 1 V - guarantees clean, asserted reset state during deep undervoltage conditions |
| MR Input Pull-Up | 70 µA typical - allows direct connection of mechanical switches without external biasing components |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive-adjacent environments without derating |
Pinout & Package
ADM708TAR is housed in an 8-lead narrow SOIC (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch, 5.00 mm × 4.00 mm body, and 1.75 mm maximum height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Manual Reset Input | Debounced TTL/CMOS-compatible input; internally pulled up with 70 µA; triggers both RESET and RESET on falling edge below 0.6 V |
| 2 (VCC) | Power Supply Input | Primary supply rail connection; requires 0.1 µF decoupling capacitor to GND for noise immunity |
| 3 (GND) | Ground Reference | Common 0 V return path for all internal circuits and output drivers |
| 4 (PFI) | Power-Fail Input | Noninverting input to 1.25 V comparator; accepts divided-down supply voltage for early warning of undervoltage or battery depletion |
| 5 (PFO) | Power-Fail Output | Active-low open-drain output signaling PFI < 1.25 V; sinks up to 1.2 mA at VCC < 3.6 V |
| 6 (NC) | No Connect | Unbonded pin; must remain unconnected and floating per datasheet |
| 7 (RESET) | Active-Low Reset Output | Push-pull output asserting low for 200 ms; drives loads up to 1.2 mA sink at VCC < 3.6 V |
| 8 (RESET) | Active-High Reset Output | Complementary push-pull output asserting high for 200 ms; provides bidirectional reset compatibility without external inversion |
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 or bidirectional I/O lines |
| Guaranteed RESET operation down to VCC = 1 V | Ensures deterministic microprocessor hold state during deep brownout, preventing undefined behavior or partial execution |
| 1.25 V precision power-fail comparator with PFI/PFO | Enables configurable early-warning shutdown for battery-backed systems or multi-rail supplies without additional ICs |
| Internally debounced MR input with 70 µA pull-up | Supports direct switch connection without RC filters or Schmitt triggers, reducing BOM count and layout area |
| 20 mV reset threshold hysteresis | Prevents oscillatory reset assertion near trip point under noisy or slowly ramping supply conditions |
Applications
| Battery-Powered Portable Instruments | Industrial Microcontroller-Based Controllers |
|---|---|
Use Scenario: Handheld multimeters and data loggers operating from single-cell Li-ion or alkaline batteries. IC Role / Device Role / Timing Role: Supervises main 3 V supply and monitors battery voltage decay via PFI to trigger graceful shutdown before cutoff. Use Value: Extends usable battery capacity by enabling precise end-of-life detection while maintaining guaranteed reset integrity down to 1 V VCC. | Use Scenario: PLC I/O modules and motor drive control boards exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Provides dual-polarity reset signaling to legacy and modern MCUs sharing the same board design, plus brownout protection during line transients. Use Value: Eliminates redesign effort when migrating between MCU families with differing reset polarity requirements. |
| Medical Diagnostic Handhelds | Communications Edge Nodes |
Use Scenario: Portable ultrasound or ECG devices requiring FDA-compliant power sequencing and fault-safe shutdown. IC Role / Device Role / Timing Role: Generates synchronized active-high and active-low reset pulses to initialize analog front-end, ADC, and wireless SoC subsystems. Use Value: Ensures deterministic startup timing across heterogeneous subsystems without custom logic or timing delays. | Use Scenario: Cellular IoT gateways powered by 3 V LDOs with backup supercapacitors. IC Role / Device Role / Timing Role: Monitors primary 3 V rail and detects capacitor discharge via PFI to initiate data save and radio disable before power loss. Use Value: Prevents data corruption and radio state lockup during brief AC outages or battery switchover events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX708TSA+ | Same 3.08 V reset threshold, dual RESET/RESET outputs, and 200 ms timeout; differs in MR input threshold (0.8 V vs. 0.6 V) and PFI leakage (±100 nA vs. ±25 nA) | Valid in legacy designs using Maxim-supplied footprints; higher PFI leakage may reduce accuracy in high-impedance divider networks | Select MAX708TSA+ only if existing layout uses Maxim's SOIC-8 footprint and MR interface tolerates higher VIH |
| TPS3808G30DBVR | 3.0 V reset threshold (vs. 3.08 V), single active-low RESET, no PFO/PFI, but adds programmable delay and lower 12 µA quiescent current | Suitable where power-fail warning is unnecessary and ultra-low sleep current is prioritized over dual-reset flexibility | Choose TPS3808G30DBVR for new energy-sensitive designs lacking PFI requirements and needing sub-20 µA standby draw |
Compared with MAX708TSA+, ADM708TAR offers tighter PFI input leakage and lower MR VIH for improved noise margin; versus TPS3808G30DBVR, it delivers essential dual-reset polarity and integrated power-fail detection at the cost of higher quiescent current.
Availability
ADM708TAR is available at Aetrix Electronics and suitable for industrial controllers, portable medical instruments, and communications edge nodes requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM708TAR 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 reset and power-fail monitoring in 3 V embedded systems where reliability and guaranteed sub-1 V operation are mandatory.
FAQ
What is the exact reset threshold voltage of the ADM708TAR?
The ADM708TAR has a nominal reset threshold of 3.08 V, with a guaranteed range of 3.00 V to 3.15 V across −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 ADM708T variants. The threshold applies to both RESET and RESET outputs and remains stable over temperature and supply variations.
Does the ADM708TAR include a watchdog timer function?
No, the ADM708TAR does not include a watchdog timer. Unlike the ADM706T series, the ADM708TAR omits the WDI and WDO pins entirely-Pin 6 is designated NC (No Connect). Its functional block diagram (Figure 14) confirms absence of watchdog circuitry, focusing solely on dual-reset generation and power-fail monitoring via PFI/PFO.
How does the ADM708TAR handle reset assertion when VCC drops below 1 V?
The ADM708TAR guarantees valid RESET and RESET output states down to VCC = 1 V. Below 1 V, internal drive capability degrades; the datasheet recommends adding an external 10 kΩ pull-down resistor from RESET to GND (Figure 19) to ensure the line remains asserted low if required for system safety-critical hold states.
Can the PFI input of the ADM708TAR monitor a 5 V supply?
Yes, the PFI input can monitor a 5 V supply using an external resistive divider. With a 1.25 V internal reference, a standard R1/R2 network (e.g., R1 = 30.1 kΩ, R2 = 10 kΩ) scales 5 V down to 1.25 V at PFI. The datasheet confirms this in Figure 20 and Applications Information, noting PFI voltage must stay within −0.3 V to VCC + 0.3 V to avoid damage.
What is the purpose of the NC pin (Pin 6) on the ADM708TAR?
Pin 6 on the ADM708TAR is explicitly designated "NC" (No Connect) in Table 4 and Figure 5 of the datasheet. It is an unconnected, unbonded terminal. Leaving it floating is required; routing traces to or placing components on Pin 6 violates the device's validated electrical and thermal performance specifications and may cause unpredictable behavior.
ADM708TAR 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:
- 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 FAQ
1.How can I place an order for ADM708TAR through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708TAR 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 reliable?
The price and inventory of ADM708TAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708TAR is usually 5 days.
3.What payment methods are accepted for ADM708TAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708TAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708TAR?
ADM708TAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708TAR 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?
For technical support, including ADM708TAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708TAR requirements.
6.How does Aetrix verify that ADM708TAR is sourced from the original manufacturer or authorized distributors?
All ADM708TAR 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 meets industry standards.
7.What is the process for return or replacement of ADM708TAR?
All ADM708TAR units undergo pre-shipment inspection (PSI). If there is an issue with ADM708TAR, 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 part is unused and in its original packaging.
Return procedure for ADM708TAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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