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Analog Devices Inc. ADM708TANZ
- Part No.:
- ADM708TANZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADM708TANZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,385
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Product details
Overview
ADM708TANZ from Analog Devices is a 3.08 V precision microprocessor supervisory circuit in an 8-lead PDIP package, providing dual active-high and active-low reset outputs, 200 ms reset pulse width, and 100 µA quiescent current for reliable power-on/brownout reset in 3 V systems.
For engineers reviewing the ADM708TANZ datasheet, ADM708TANZ pinout, ADM708TANZ application, or ADM708TANZ equivalent, this page delivers verified specifications, functional context, package mapping, real-world use cases, and validated alternative options for industrial embedded and battery-powered microprocessor monitoring.
Technical Context
The ADM708TANZ integrates a precision voltage monitor with 3.08 V reset threshold (±75 mV hysteresis), a debounced manual reset input (MR) with 70 µA internal pull-up, and a 1.25 V power-fail comparator (PFI/PFO) for early low-supply warning. It guarantees valid RESET operation down to VCC = 1 V.
Unlike the ADM706x series, ADM708TANZ omits the watchdog timer but provides both RESET (active low) and RESET (active high) outputs on separate pins-enabling direct interface with bidirectional or polarity-sensitive microprocessor reset lines without external inversion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V ±0.075 V - precisely monitors 3 V supply rails and triggers reset before brownout-induced MCU instability. |
| Reset Pulse Width | 200 ms - ensures sufficient hold time for full microprocessor initialization and clock stabilization after power-up. |
| Quiescent Current | 100 µA at VCC < 3.6 V - enables long-term operation in battery-backed or energy-constrained systems. |
| Power-Fail Detection | 1.25 V PFI threshold - supports external resistor divider for monitoring secondary supplies or preregulator inputs. |
| VCC Operating Range | 3.15 V to 5.5 V - compatible with 3.3 V nominal systems and tolerant of upstream regulator ripple or dropout. |
| RESET Output Drive | VOH ≥ 0.8×VCC / VOL ≤ 0.3 V - meets TTL/CMOS logic thresholds across full operating range for robust interfacing. |
| Temperature Range | −40°C to +85°C - qualified for industrial-grade embedded applications without derating. |
Pinout & Package
ADM708TANZ is housed in an 8-lead narrow-body plastic dual in-line package (PDIP, N-8), compliant with JEDEC MS-001, with 0.300-inch body width and 0.100-inch lead pitch.
| 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 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 be low-impedance. |
| 4 PFI | Power-Fail Input | Noninverting input to 1.25 V comparator; used with external resistor divider to monitor auxiliary supplies. |
| 5 PFO | Power-Fail Output | Active-low open-drain output signaling supply drop below PFI threshold; can drive interrupt or MR. |
| 6 NC | No Connect | Unbonded pin; must remain unconnected per datasheet to avoid parasitic coupling or latch-up risk. |
| 7 RESET | Active-Low Reset Output | Push-pull output asserted low for 200 ms during power-up, brownout, or MR event; valid down to VCC = 1 V. |
| 8 RESET | Active-High Reset Output | Inverted complement of RESET; enables direct interface with MCUs 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 designs. |
| Guaranteed reset validity at 1 V VCC | Ensures microprocessor remains held in reset until supply fully collapses, preventing undefined state transitions. |
| Debounced manual reset input | 70 µA internal pull-up and 200 ms timeout prevent false resets from switch bounce or noise on MR line. |
| 1.25 V precision power-fail comparator | Enables early-warning shutdown via PFO interrupt before main supply fails, critical for data integrity in portable instruments. |
| Industrial temperature qualification | −40°C to +85°C operation supports deployment in automotive under-hood, factory automation, and outdoor edge devices. |
Applications
| Industrial Control PLCs | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Monitoring 3.3 V system supply in programmable logic controllers exposed to wide ambient temperature swings and EMI-rich factory environments. IC Role / Device Role / Timing Role: Supervisory IC providing power-on reset, brownout detection, and manual reset coordination for ARM Cortex-M7-based controller. Use Value: Dual RESET outputs interface directly with FPGA configuration logic (active-low) and MCU boot ROM (active-high), eliminating level-shifting components. | Use Scenario: Long-duration environmental monitoring using coin-cell–powered microcontrollers with flash memory writes requiring clean power sequencing. IC Role / Device Role / Timing Role: Voltage supervisor ensuring safe shutdown when battery voltage drops below 3.0 V, with PFO triggering EEPROM save before cutoff. Use Value: 100 µA quiescent current extends battery life; 1.25 V PFI comparator enables accurate low-battery warning with minimal external components. |
| Medical Handheld Diagnostics | Smart Energy Meters |
Use Scenario: Portable blood glucose analyzer requiring certified reset reliability and immunity to transient supply dips during sensor actuation. IC Role / Device Role / Timing Role: Primary reset generator with MR tied to emergency button; PFO monitors backup supercapacitor voltage. Use Value: 200 ms reset pulse exceeds IEC 62304 minimum timing requirements; guaranteed reset validity at 1 V prevents spurious reboots during capacitor discharge. | Use Scenario: Revenue-grade electricity meter with isolated RS-485 communication, where power interruption must trigger secure firmware rollback. IC Role / Device Role / Timing Role: System supervisor asserting RESET on main 3.3 V rail and feeding PFO to microcontroller's NMI pin for immediate non-maskable shutdown. Use Value: Independent PFI/PFO path ensures deterministic fail-safe behavior even if primary reset logic is compromised by software fault. |
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 PDIP-8 package; 120 µA typical quiescent current vs. 100 µA for ADM708TANZ. | Pinout identical; supports same PFI/PFO monitoring but lacks guaranteed reset validity below 1.2 V VCC. | Select when sourcing legacy MAXIM-compatible BOMs; verify VCC collapse behavior in ultra-low-power shutdown sequences. |
| TPS3808G30DBVR | 3.0 V reset threshold (±0.5%), SOT-23-6 package; single active-low RESET output only; no RESET complement or PFI input. | Smaller footprint and lower cost, but requires external inverter for active-high reset and external comparator for power-fail warning. | Select for space-constrained designs where dual reset polarity and PFI are not required; confirm 3.0 V vs. 3.08 V threshold margin suffices. |
Compared with MAX708TESA+, ADM708TANZ offers superior low-VCC reset guarantee (1 V vs. 1.2 V), while TPS3808G30DBVR trades functionality for size and cost-making ADM708TANZ optimal where dual-reset polarity and integrated PFI are design-critical.
Availability
ADM708TANZ is available at Aetrix Electronics and suitable for industrial control PLCs, battery-powered data loggers, medical handheld diagnostics, and smart energy meters requiring stable component supply across extended temperature ranges and multi-year production cycles.
Supply support for ADM708TANZ 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 deterministic power-monitoring and fail-safe reset generation in resource-constrained embedded systems.
FAQ
What is the exact reset threshold voltage of the ADM708TANZ?
The ADM708TANZ 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 laser-trimmed during manufacturing and applies to both RESET and RESET outputs. The threshold is referenced to an internal bandgap, ensuring stability over temperature and supply variation. Designers should use 3.08 V as the nominal point for calculating hysteresis or supply margin in 3 V systems.
Does the ADM708TANZ include a watchdog timer function?
No, the ADM708TANZ does not include a watchdog timer. It is functionally distinct from the ADM706x series, which integrates watchdog input (WDI) and watchdog output (WDO). The ADM708TANZ focuses exclusively on voltage supervision and reset generation, offering dual-polarity RESET outputs and a dedicated power-fail comparator (PFI/PFO) instead. If watchdog functionality is required, the ADM706TANZ is the direct counterpart in the same family.
How does the ADM708TANZ handle power supply brownout conditions?
The ADM708TANZ detects brownout when VCC falls below its 3.08 V reset threshold, immediately asserting both RESET (low) and RESET (high) for a fixed 200 ms duration. Crucially, it maintains valid reset output down to VCC = 1 V, ensuring the microprocessor stays held in reset throughout the entire supply collapse. Once VCC recovers above threshold, the 200 ms timer restarts, preventing premature release during marginal recovery.
Can the PFI input of the ADM708TANZ monitor a 5 V supply?
Yes, the PFI input can monitor a 5 V supply using an external resistor divider that scales the voltage to ≤1.25 V at the PFI pin. For example, a 3.9 kΩ (top) and 1.2 kΩ (bottom) divider yields ~1.22 V at PFI when VIN = 5 V. The PFI pin's absolute maximum rating is VCC + 0.3 V, so the divider must ensure PFI never exceeds that limit-even during VCC ramp-up. A Schottky clamp diode to RESET (as shown in Figure 17 of the datasheet) is recommended for robustness.
What is the purpose of the NC pin on the ADM708TANZ PDIP package?
Pin 6 of the ADM708TANZ is marked NC (No Connect) and is internally unconnected-no bond wire attaches to it. It must remain floating and unconnected in the PCB layout to prevent parasitic coupling, unintended current paths, or potential latch-up. Unlike some "NC" pins that serve as test points or thermal pads, this pin has zero electrical function and no hidden role in the ADM708TANZ die configuration.
ADM708TANZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ADM708TANZ FAQ
1.How can I place an order for ADM708TANZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708TANZ 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 ADM708TANZ reliable?
The price and inventory of ADM708TANZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708TANZ is usually 5 days.
3.What payment methods are accepted for ADM708TANZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708TANZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708TANZ?
ADM708TANZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708TANZ 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 ADM708TANZ?
For technical support, including ADM708TANZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708TANZ requirements.
6.How does Aetrix verify that ADM708TANZ is sourced from the original manufacturer or authorized distributors?
All ADM708TANZ 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 ADM708TANZ meets industry standards.
7.What is the process for return or replacement of ADM708TANZ?
All ADM708TANZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM708TANZ, 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 ADM708TANZ part is unused and in its original packaging.
Return procedure for ADM708TANZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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