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Analog Devices Inc. ADM708TARZ-REEL
- Part No.:
- ADM708TARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM708TARZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:8,971
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Product details
Overview
ADM708TARZ-REEL from Analog Devices is a 3.08 V precision microprocessor supervisory circuit in an 8-lead SOIC package, providing dual active-high/active-low reset outputs, 200 ms reset pulse width, 100 µA quiescent current, and 1.25 V power-fail comparator for low-battery detection in battery-operated embedded systems.
For engineers reviewing the ADM708TARZ-REEL datasheet, ADM708TARZ-REEL pinout, ADM708TARZ-REEL application, or ADM708TARZ-REEL equivalent, this page delivers verified functional specifications, validated pin roles, confirmed reset threshold (3.08 V), guaranteed RESET validity down to 1 V VCC, and real-world timing behavior for microprocessor reset coordination and power-fail warning integration.
Technical Context
The ADM708TARZ-REEL implements a dual-output reset generator with independent 3.08 V supply monitoring and a 1.25 V reference-based power-fail comparator. It lacks watchdog timer circuitry-unlike the ADM706x series-but provides both RESET (active low) and RESET (active high) outputs simultaneously for bidirectional or mixed-logic microprocessor interfaces.
Its internal 70 µA MR pull-up enables direct switch connection without external biasing, and its PFI/PFO pair supports early-warning shutdown sequencing via resistive divider networks. RESET remains valid with VCC as low as 1 V, ensuring deterministic processor hold-down during brownout recovery.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V ±75 mV - precisely monitors 3.3 V supplies with defined hysteresis for stable power-on reset assertion. |
| Reset Pulse Width | 200 ms typical - ensures sufficient time for microprocessor initialization and clock stabilization after power-up or brownout 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 ±50 mV - detects falling input rails or battery voltage decay before system failure, triggering orderly shutdown via PFO interrupt. |
| VCC Operating Range | 3.15 V to 5.5 V - compatible with 3.3 V and 5 V logic domains while maintaining reset accuracy across temperature. |
| RESET Validity | Guaranteed down to VCC = 1 V - maintains asserted state through deep brownout, preventing spurious release during unstable supply conditions. |
| Output Drive Strength | VOH ≥ 0.8×VCC / VOL ≤ 0.3 V @ 500 µA sink - directly interfaces TTL/CMOS inputs without level-shifting or buffering. |
Pinout & Package
ADM708TARZ-REEL is housed in an 8-lead narrow SOIC (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch and gull-wing leads. Pin 1 is marked by a beveled corner or dot; device orientation follows standard SOIC top-view convention.
| 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 pulled 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 return path for all internal circuits and output drivers; must connect to system ground plane. |
| 4 (PFI) | Power-Fail Input | Noninverting input to 1.25 V comparator; accepts scaled-down supply voltage via resistor divider for early warning detection. |
| 5 (PFO) | Power-Fail Output | Active-low open-drain output signaling PFI < 1.25 V; drives NMI or MR to initiate controlled shutdown. |
| 6 (NC) | No Connect | Internally unconnected; must remain floating or tied to GND-no electrical function or routing required. |
| 7 (RESET) | Active-Low Reset Output | Push-pull output asserting low for 200 ms on VCC drop or MR activation; remains low until VCC > 3.15 V for ≥200 ms. |
| 8 (RESET) | Active-High Reset Output | Inverted complement of Pin 7; provides simultaneous active-high reset signal for mixed-logic or bidirectional microprocessor interfaces. |
Key Features
| Feature | Design Value |
|---|---|
| Dual reset polarity outputs | Simultaneous RESET (active low) and RESET (active high) eliminate need for external inverters in systems requiring both logic levels. |
| 1.25 V power-fail comparator | Enables predictive shutdown by monitoring auxiliary rails or battery voltage via PFI/PFO-no additional ICs required. |
| Valid reset down to 1 V VCC | Ensures microprocessor remains held in reset during deep brownout or battery depletion, preventing undefined execution states. |
| Internal MR pull-up (70 µA) | Allows direct connection of mechanical reset switches without external resistors, simplifying BOM and layout. |
| 3.08 V reset threshold | Optimized for 3.3 V systems with margin against ripple and tolerance drift, reducing false resets in noisy industrial environments. |
Applications
| Industrial PLC Controller Monitoring | Portable Medical Instrument Power Management |
|---|---|
Use Scenario: Real-time monitoring of 3.3 V main supply and 5 V analog front-end in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Supervisory circuit asserting synchronized RESET/RESET signals upon supply deviation, while PFO triggers firmware-initiated I/O freeze before power collapse. Use Value: Prevents corrupted ladder logic execution and data loss during transient line sags by guaranteeing 200 ms reset hold time and 1 V minimum VCC validity. | Use Scenario: Battery-backed handheld ECG monitor requiring graceful shutdown when Li-ion cell drops below 3.2 V. IC Role / Device Role / Timing Role: Dual-role supervisor: 3.08 V threshold guards MCU core supply; 1.25 V PFI comparator monitors scaled battery voltage for preemptive alert and memory save. Use Value: Extends usable battery life by enabling full SRAM backup and display fade-out before hard power loss-no external comparators needed. |
| Smart Energy Meter Firmware Protection | Automotive Body Control Module (BCM) Reset Coordination |
Use Scenario: Tamper-resistant electricity meter with isolated MCU, RTC, and metrology ASIC sharing a 3.3 V rail subject to grid transients. IC Role / Device Role / Timing Role: Centralized reset arbiter generating coordinated RESET/RESET pulses and using PFO to flag undervoltage events to secure bootloader for firmware rollback. Use Value: Eliminates risk of partial firmware writes during brownout by enforcing strict 200 ms reset window and validating reset integrity down to 1 V. | Use Scenario: 12 V automotive BCM converting to 3.3 V for microcontroller, where cold-crank events cause rapid VCC dip below 3.0 V. IC Role / Device Role / Timing Role: High-reliability reset generator with 3.08 V threshold and 200 ms pulse width, interfacing bidirectionally with MCU's open-drain reset pin via 4.7 kΩ current-limiting resistor. Use Value: Prevents bus contention and latch-up during cold-crank by maintaining clean, non-overlapping RESET/RESET assertion and supporting safe bidirectional reset arbitration. |
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, 200 ms timeout, dual RESET/RESET outputs, same SOIC-8 package; higher quiescent current (25 µA min vs. 100 µA typ for ADM708T). | Designed for commercial temperature range (0°C to +70°C) only; not rated for industrial −40°C to +85°C operation. | Select MAX708TESA+ only for cost-sensitive commercial designs where extended temperature is unnecessary. |
| TPS3808G33DBVR | 3.3 V reset threshold (±0.5%), 200 ms delay, single active-low reset output; no active-high output or PFI/PFO comparator. | Lacks power-fail warning capability and dual-polarity reset-requires external circuitry to replicate ADM708TARZ-REEL's PFO-driven shutdown sequencing. | Choose TPS3808G33DBVR when only basic 3.3 V supervision is needed and PFI functionality is omitted from system architecture. |
Compared with MAX708TESA+, ADM708TARZ-REEL offers guaranteed industrial temperature support and lower typical supply current; compared with TPS3808G33DBVR, it delivers integrated power-fail warning and dual-reset polarity-reducing component count and PCB area in safety-critical embedded systems.
Availability
ADM708TARZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controller monitoring, portable medical instrument power management, smart energy meter firmware protection, and automotive body control module reset coordination requiring stable component supply and long-term lifecycle assurance.
Supply support for ADM708TARZ-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, automotive, communications, and healthcare markets with precision signal chain solutions.
The ADM708 series belongs to Analog Devices' microprocessor supervisory product line, engineered specifically for deterministic reset generation, power-fail prediction, and robust operation in harsh industrial and battery-constrained environments.
FAQ
What is the exact reset threshold voltage for ADM708TARZ-REEL?
The ADM708TARZ-REEL has a nominal reset threshold of 3.08 V, with a specified range of 3.00 V to 3.15 V over temperature and supply variation. This value is factory-trimmed and applies to both RESET and RESET outputs, ensuring precise supervision of 3.3 V power rails without external calibration. The threshold is referenced to an internal bandgap and remains stable across the −40°C to +85°C industrial temperature range.
Does ADM708TARZ-REEL include a watchdog timer function?
No, ADM708TARZ-REEL does not include a watchdog timer. Unlike the ADM706x family, the ADM708x series omits the WDI and WDO pins entirely-evident in its pinout (Pin 6 = NC) and functional block diagram. Its role is strictly power-supply monitoring and reset generation. For watchdog capability, engineers must select an ADM706T variant or add a discrete timer circuit.
How does the PFI/PFO feature work in ADM708TARZ-REEL?
The PFI input connects to the noninverting terminal of an internal 1.25 V comparator; when PFI voltage falls below 1.25 V, PFO asserts low. In ADM708TARZ-REEL, PFI accepts a scaled version of a secondary supply (e.g., battery or analog rail) via resistor divider. PFO can drive an interrupt or be wired to MR to trigger system reset-enabling predictive shutdown before main supply collapse, with no external components required beyond the divider.
Can ADM708TARZ-REEL operate with VCC below 3.08 V and still assert RESET?
Yes-ADM708TARZ-REEL guarantees valid RESET assertion down to VCC = 1 V. As VCC drops below the 3.08 V threshold, RESET goes low and RESET goes high; both outputs remain actively driven until VCC falls below ~1 V, where internal circuitry loses regulation. This ensures the microprocessor stays held in reset throughout deep brownout, eliminating race conditions during power recovery.
What package type and lead finish does ADM708TARZ-REEL use?
ADM708TARZ-REEL uses an 8-lead narrow SOIC (R-8) package per JEDEC MS-012-AA, with lead pitch of 1.27 mm and gull-wing leads. The "Z" suffix indicates lead-free (Pb-free) and RoHS-compliant termination, and "-REEL" denotes tape-and-reel packaging for automated SMT assembly. Dimensions are 5.00 mm × 4.00 mm × 1.50 mm (L × W × H).
ADM708TARZ-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:
- 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
ADM708TARZ-REEL FAQ
1.How can I place an order for ADM708TARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708TARZ-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 ADM708TARZ-REEL reliable?
The price and inventory of ADM708TARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708TARZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM708TARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708TARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708TARZ-REEL?
ADM708TARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708TARZ-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 ADM708TARZ-REEL?
For technical support, including ADM708TARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708TARZ-REEL requirements.
6.How does Aetrix verify that ADM708TARZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM708TARZ-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 ADM708TARZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM708TARZ-REEL?
All ADM708TARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM708TARZ-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 ADM708TARZ-REEL part is unused and in its original packaging.
Return procedure for ADM708TARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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