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Analog Devices Inc. ADM708TARZ
- Part No.:
- ADM708TARZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM708TARZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:503
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Product details
Overview
ADM708TARZ 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 battery-operated embedded systems.
For engineers reviewing the ADM708TARZ datasheet, ADM708TARZ pinout, ADM708TARZ application, or ADM708TARZ equivalent, this page delivers verified functional identity, exact reset threshold (3.08 V), guaranteed RESET validity down to VCC = 1 V, dual-reset output behavior, and confirmed absence of watchdog timer - critical for reliable 3 V system power monitoring and orderly shutdown design.
Technical Context
The ADM708TARZ implements a dual-output reset generator with independent voltage monitoring and power-fail detection. Its internal reference is fixed at 3.08 V for VCC supervision and 1.25 V for PFI comparison, with hysteresis of 20 mV on the reset threshold and guaranteed operation across −40°C to +85°C.
Unlike the ADM706x series, the ADM708TARZ omits the watchdog timer and replaces WDI/WDO pins with NCs, while retaining debounced MR input, PFI/PFO comparator pair, and dual RESET/RESET outputs - making it suitable for systems requiring deterministic reset control without software supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V ±0.08 V - precisely monitors 3.0–3.3 V supplies; triggers reset before brownout affects microprocessor stability. |
| Reset Pulse Width | 200 ms - ensures sufficient hold time for microprocessor power-up stabilization and firmware initialization. |
| Quiescent Current | 100 µA - enables long-term operation in battery-powered instruments without significant drain. |
| Power-Fail Threshold | 1.25 V - detects supply droop or battery depletion via external resistor divider on PFI pin. |
| VCC Operating Range | 3.15 V to 5.5 V - supports 3.3 V nominal rails with margin for ripple and tolerance; valid down to 1 V for reset assertion. |
| Output Drive Strength | VOH ≥ 0.8×VCC / VOL ≤ 0.3 V - compatible with TTL/CMOS logic families and robust against noise on reset lines. |
| Package | 8-lead SOIC_N (R-8) - surface-mount footprint with 1.27 mm pitch; JEDEC MS-012-AA compliant. |
Pinout & Package
ADM708TARZ is housed in an 8-lead narrow SOIC (R-8) package per JEDEC MS-012-AA, with 1.27 mm lead pitch and 5.00 mm × 4.00 mm body dimensions. 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 | Debounced manual reset input; internally pulled up with 70 µA; asserts reset when driven below 0.6 V. |
| 2 | VCC | Positive supply input; requires 0.1 µF decoupling capacitor to GND for noise immunity during reset transitions. |
| 3 | GND | Ground reference for all internal circuits and I/O; must be connected to system ground plane. |
| 4 | PFI | Noninverting input to 1.25 V comparator; monitors auxiliary supply or battery voltage via external resistive divider. |
| 5 | PFO | Active-low power-fail output; goes low when PFI < 1.25 V, enabling early-warning interrupt or backup power activation. |
| 6 | NC | No connect - pin is unconnected internally; must remain floating or grounded per layout best practice. |
| 7 | RESET | Active-low reset output; held low for 200 ms after VCC rise above 3.08 V or MR deassertion. |
| 8 | RESET | Active-high reset output; complementary to pin 7; eliminates need for external inverter in active-high reset systems. |
Key Features
| Feature | Design Value |
|---|---|
| Dual active-high and active-low reset outputs | Eliminates external level-shifting or inversion logic for compatibility with diverse microprocessor reset architectures. |
| Guaranteed RESET validity down to VCC = 1 V | Ensures microprocessor remains held in reset during full power collapse and brownout recovery, preventing undefined states. |
| 1.25 V precision power-fail comparator (PFI/PFO) | Enables configurable early-warning detection of supply droop or battery depletion using simple resistor networks. |
| 200 ms reset timeout with hysteresis | Prevents spurious resets during marginal supply conditions; 20 mV hysteresis avoids oscillation near threshold. |
| Debounced manual reset input (MR) | Accepts direct switch connection or logic-level signals without external RC filtering or software debouncing. |
Applications
| Industrial PLC Controller Monitoring | Portable Medical Instrument Power Management |
|---|---|
|
Use Scenario: Continuous operation of programmable logic controllers in factory environments with fluctuating 3.3 V rail voltages. IC Role / Device Role / Timing Role: Supervises main 3.3 V supply and generates synchronized active-low and active-high reset pulses to ensure deterministic startup and fault recovery. Use Value: Dual reset outputs interface directly with both FPGA configuration logic (active-high) and MCU core (active-low), eliminating board-level inverters and reducing BOM count. |
Use Scenario: Battery-powered handheld diagnostic devices requiring graceful shutdown before battery voltage falls below operational minimum. IC Role / Device Role / Timing Role: Monitors battery voltage via PFI divider and asserts PFO interrupt 100 ms before VCC drops below 3.08 V, triggering data save and sleep mode. Use Value: 1.25 V comparator threshold allows precise tuning of low-battery warning point; 100 µA quiescent current extends usable battery life between charges. |
| Network Edge Router Boot Integrity | Smart Energy Meter Firmware Protection |
|
Use Scenario: Carrier-grade edge routers that must recover reliably after AC power interruption or PoE voltage sag. IC Role / Device Role / Timing Role: Provides 200 ms power-on reset pulse and monitors 3.3 V rail with 3.08 V threshold to prevent boot corruption during unstable power-up sequences. Use Value: RESET validity down to VCC = 1 V guarantees processor remains held until power fully collapses, avoiding partial execution and memory corruption. |
Use Scenario: Revenue-grade electricity meters deployed in remote locations where firmware integrity must survive grid brownouts. IC Role / Device Role / Timing Role: Generates hardware reset on VCC drop and uses PFO to trigger non-maskable interrupt for EEPROM-safe shutdown sequence prior to power loss. Use Value: Dual reset outputs enable simultaneous reset of metering ASIC (active-low) and secure bootloader (active-high), ensuring atomic state preservation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM708SARZ | 2.93 V reset threshold instead of 3.08 V; identical pinout, package, and dual-reset functionality. | Suitable for 3.0 V nominal systems with tighter supply tolerance; not interchangeable without verifying VCC margin. | Select ADM708SARZ only if system VCC nominal is 3.0 V and 2.93 V threshold provides better noise margin than 3.08 V. |
| MAX708TR | Pin-compatible Maxim replacement; same 3.08 V threshold, dual reset outputs, and PFI/PFO, but higher 250 µA quiescent current. | Valid drop-in alternative for legacy designs migrating from MAXIM; requires validation of increased supply current impact on battery life. | Choose MAX708TR only when existing PCB layout and firmware rely on Maxim's timing or drive characteristics; otherwise prefer ADM708TARZ for lower power. |
Compared with ADM708SARZ, ADM708TARZ offers higher reset threshold for improved noise immunity in noisy 3.3 V environments; compared with MAX708TR, it reduces quiescent current by 60%, extending battery runtime in portable applications without sacrificing functionality or pin compatibility.
Availability
ADM708TARZ is available at Aetrix Electronics and suitable for industrial PLC controllers, portable medical instruments, network edge routers, and smart energy meters requiring stable component supply, long-lifecycle support, and guaranteed parametric consistency across production batches.
Supply support for ADM708TARZ 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control applications.
The ADM708 series belongs to Analog Devices' microprocessor supervisory product line, designed specifically for deterministic power monitoring and reset generation in 3 V/3.3 V embedded systems where reliability, low power, and dual-output flexibility are critical.
FAQ
What is the exact reset threshold voltage for ADM708TARZ?
The ADM708TARZ 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 ADM708T devices. It is distinct from the 2.63 V (R) and 2.93 V (S) variants in the same family.
Does ADM708TARZ include a watchdog timer function?
No, ADM708TARZ does not include a watchdog timer. Unlike the ADM706x series, the ADM708TARZ replaces WDI and WDO pins with no-connect (NC) terminals, as confirmed in Figure 5 and Table 4 of the datasheet. Its supervisory function is limited to power-on/brownout reset generation and power-fail warning via PFI/PFO.
What are the key differences between ADM708TARZ and ADM706TARZ?
ADM708TARZ provides dual active-high and active-low reset outputs (RESET and RESET) and omits the watchdog timer, while ADM706TARZ offers only one reset output (active-low) plus WDI/WDO functionality. Both share the same 3.08 V threshold, 200 ms pulse width, and SOIC-8 package, but their pinouts differ: ADM706TARZ uses pins 6 and 8 for WDI and WDO, whereas ADM708TARZ assigns those as NC and RESET.
Can ADM708TARZ operate with a 3.0 V supply?
ADM708TARZ requires a minimum VCC of 3.15 V for guaranteed specification compliance, as stated in the "VCC Operating Voltage Range" row of Table 1. While it may function at 3.0 V in some conditions, reset assertion timing, output drive strength, and PFI comparator accuracy are not characterized below 3.15 V - use ADM708SARZ (2.93 V threshold, 3.00 V min) for true 3.0 V systems.
How is the power-fail comparator used in ADM708TARZ?
The ADM708TARZ power-fail comparator uses an internal 1.25 V reference and exposes its noninverting input as the PFI pin. By connecting PFI to a resistor divider from a monitored supply (e.g., battery or auxiliary rail), the comparator asserts PFO low when the divided voltage falls below 1.25 V - enabling early-warning interrupts or backup power switching before main VCC drops below 3.08 V.
ADM708TARZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for ADM708TARZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708TARZ 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 reliable?
The price and inventory of ADM708TARZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708TARZ is usually 5 days.
3.What payment methods are accepted for ADM708TARZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708TARZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708TARZ?
ADM708TARZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708TARZ 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?
For technical support, including ADM708TARZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708TARZ requirements.
6.How does Aetrix verify that ADM708TARZ is sourced from the original manufacturer or authorized distributors?
All ADM708TARZ 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 meets industry standards.
7.What is the process for return or replacement of ADM708TARZ?
All ADM708TARZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM708TARZ, 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 part is unused and in its original packaging.
Return procedure for ADM708TARZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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