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Analog Devices Inc. ADM708ARMZ-REEL
- Part No.:
- ADM708ARMZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADM708ARMZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,750
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Product details
Overview
ADM708ARMZ-REEL from Analog Devices is a low-cost microprocessor supervisory circuit designed for 5 V supply monitoring in embedded systems. It provides active-high and active-low reset outputs, 4.40 V precision voltage threshold detection, 200 ms reset pulse width, and power-fail warning via PFI/PFO comparator - enabling reliable power-on reset and brownout protection in industrial controllers and intelligent instruments.
For engineers reviewing the ADM708ARMZ-REEL datasheet, ADM708ARMZ-REEL pinout, ADM708ARMZ-REEL application, or ADM708ARMZ-REEL equivalent, key selection considerations include its 4.40 V reset threshold, dual RESET polarity support, MSOP-8 package footprint, guaranteed RESET validity down to 1 V VCC, and absence of watchdog timer functionality compared to ADM705/ADM706 variants.
Technical Context
The ADM708ARMZ-REEL implements a precision bandgap-based voltage monitor with 4.40 V ±150 mV threshold and 40 mV hysteresis, ensuring stable reset assertion during supply ramp-up and brownout. Its dual-reset architecture delivers both active-low (RESET) and active-high (RESET) outputs synchronized to the same 200 ms timing window.
It integrates a dedicated 1.25 V reference comparator for external power-fail detection (PFI → PFO), supporting early-warning shutdown sequencing. Unlike ADM705/ADM706, it omits watchdog timer circuitry (no WDI/WDO pins), simplifying design where software supervision is handled externally or unnecessary.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40 V ±150 mV - triggers reset when 5 V rail drops below this level, matching common TTL/CMOS logic supply tolerance limits. |
| Reset Pulse Width | 200 ms typical - ensures sufficient hold time for microprocessor initialization and clock stabilization after power-up. | Supply Current | 190 µA typical - enables low-power operation in battery-backed or energy-sensitive applications without compromising supervision reliability. |
| VCC Validity Range | 1.0 V to 5.5 V - guarantees functional RESET output even during deep brownout or ultra-low-voltage startup conditions. |
| Power-Fail Comparator | 1.25 V reference threshold at PFI - allows monitoring of secondary supplies or preregulator inputs using external resistor dividers. |
| Manual Reset Input | TTL/CMOS-compatible MR pin with 250 µA internal pull-up - supports direct switch or logic-level reset assertion without external biasing. |
| Operating Temperature | −40°C to +85°C - qualified for industrial-grade deployment in harsh ambient environments. |
Pinout & Package
ADM708ARMZ-REEL is housed in an 8-lead Mini Small Outline Package (MSOP, RM-8), measuring 3.0 mm × 3.0 mm × 0.85 mm with 0.65 mm lead pitch. The package is RoHS-compliant and optimized for high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET (active high) | Asserts high for 200 ms on power-up, brownout, or MR activation - directly interfaces with processors requiring active-high reset logic. |
| 2 | RESET (active low) | Complementary output to Pin 1; asserts low synchronously - supports bidirectional reset bus architectures with current-limiting resistor. |
| 3 | MR (Manual Reset) | Debounced TTL/CMOS input; pulling below 0.8 V forces reset - eliminates need for external RC debounce network. |
| 4 | VCC | 5 V supply input; requires local 0.1 µF decoupling capacitor - powers all internal comparators and output drivers. |
| 5 | GND | Ground reference for all analog and digital functions - must be connected to system ground plane with low-inductance path. |
| 6 | PFI | Noninverting input to 1.25 V reference comparator - monitors external supply via resistive divider; connect to GND if unused. |
| 7 | PFO | Open-drain power-fail output - goes low when PFI < 1.25 V; requires external pull-up for interrupt or reset generation. |
| 8 | NC | No connect - left unconnected per datasheet; no internal connection or function. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-polarity reset outputs | Simultaneous active-high (RESET) and active-low (RESET) signals eliminate need for external inverters in mixed-logic systems. |
| Guaranteed reset below 1 V VCC | Ensures deterministic processor hold state during deep undervoltage events - critical for data retention and safe shutdown. |
| Integrated 1.25 V reference comparator | Enables flexible power-fail detection on auxiliary rails (e.g., 3.3 V, 12 V) using only two external resistors - no additional reference IC required. |
| 250 µA internal MR pull-up | Permits direct connection of momentary switches without external biasing components - reduces BOM count and board area. |
| Industrial temperature range | Validated operation from −40°C to +85°C - suitable for factory automation, motor drives, and outdoor instrumentation. |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
|
Use Scenario: Monitors 5 V system rail in programmable logic controller with isolated I/O modules and real-time Ethernet interface. IC Role / Device Role / Timing Role: Provides power-on reset synchronization and brownout recovery signal to ARM Cortex-M7 MCU; PFO triggers graceful I/O shutdown sequence. Use Value: Prevents firmware corruption during unstable AC line conditions by holding CPU in reset until VCC stabilizes above 4.40 V for ≥200 ms. |
Use Scenario: Supervises main 5 V supply in portable ultrasound imaging device with battery backup and FPGA-based beamforming. IC Role / Device Role / Timing Role: Generates dual-reset signals for FPGA configuration and ARM application processor; PFI monitors battery voltage via divider for low-battery warning. Use Value: Enables seamless transition from AC to battery power without system crash, leveraging guaranteed RESET validity down to 1 V VCC. |
| Smart Energy Meter | Automotive Body Control Module |
|
Use Scenario: Embedded in DIN-rail mounted electricity meter with metrology SoC, RF mesh comms, and tamper-detection circuitry. IC Role / Device Role / Timing Role: Ensures reliable boot of metrology processor after power restoration following grid outage; MR pin tied to tamper switch. Use Value: Eliminates need for discrete reset generator and voltage detector, reducing component count while meeting IEC 62053 accuracy requirements. |
Use Scenario: Used in 12 V-powered BCM managing door locks, lighting, and CAN gateway - powered via 5 V LDO from vehicle battery. IC Role / Device Role / Timing Role: Detects LDO dropout during cold-crank (battery dip to 6 V); RESET holds microcontroller in safe state until 5 V rail recovers. Use Value: Prevents erroneous actuation of safety-critical loads (e.g., airbag pre-tensioners) during transient undervoltage events. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM706ARZ-REEL | Includes watchdog timer (WDI/WDO), 4.40 V threshold, SOIC-8 package, active-low only RESET. | Required where software activity monitoring is needed; lacks active-high RESET output. | Select when watchdog supervision is mandatory and board layout accommodates SOIC-8 instead of MSOP-8. |
| MAX692AESA+ | 4.40 V threshold, 200 ms reset width, SOIC-8, no watchdog, but includes power-fail comparator with 1.25 V reference. | Functionally identical supervision features; differs in MR input threshold (0.8 V vs. 0.8 V) and supply current (20 µA vs. 190 µA). | Choose for ultra-low-quiescent-current designs where 20 µA vs. 190 µA impacts battery life significantly. |
Compared with ADM708ARMZ-REEL, ADM706ARZ-REEL adds watchdog capability at the cost of losing active-high RESET and requiring SOIC-8 layout space, while MAX692AESA+ offers 10× lower quiescent current but lacks dual-reset outputs and uses a different package - making ADM708ARMZ-REEL optimal for space-constrained industrial designs needing both reset polarities.
Availability
ADM708ARMZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, medical diagnostic instruments, smart energy meters, and automotive body control modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ADM708ARMZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, serving industrial, communications, automotive, and healthcare markets.
The ADM705–ADM708 family was engineered specifically for robust, low-cost microprocessor supply monitoring in space- and power-constrained embedded systems - emphasizing precision threshold detection, dual-reset flexibility, and guaranteed operation across full industrial temperature and voltage ranges.
FAQ
What is the reset threshold voltage for ADM708ARMZ-REEL?
The ADM708ARMZ-REEL has a nominal reset threshold of 4.40 V, with a tolerance of ±150 mV over temperature and supply variations. This value is factory-trimmed and specified in the datasheet Table 1 under "Reset Threshold" for ADM706/ADM708 devices. The threshold applies to both RESET and RESET outputs, ensuring consistent triggering behavior across operating conditions.
Does ADM708ARMZ-REEL include a watchdog timer function?
No, ADM708ARMZ-REEL does not include a watchdog timer. Unlike ADM705/ADM706 variants, it omits WDI and WDO pins entirely - as confirmed in Figure 5 (MSOP pinout) and Table 3 (pin descriptions). Its functional scope is limited to voltage monitoring, manual reset, and power-fail detection, making it suitable for applications where software supervision is handled externally.
What package type is used for ADM708ARMZ-REEL?
ADM708ARMZ-REEL is packaged in an 8-lead Mini Small Outline Package (MSOP), also designated RM-8 per JEDEC MO-187-AA. Its dimensions are 3.0 mm × 3.0 mm × 0.85 mm with 0.65 mm lead pitch. The "ARMZ" part number suffix and Ordering Guide entry explicitly confirm RM-8 as the package, and "Z" denotes RoHS compliance.
Can ADM708ARMZ-REEL monitor a 3.3 V supply?
Yes, ADM708ARMZ-REEL can monitor a 3.3 V supply using its PFI input and internal 1.25 V reference comparator. By selecting appropriate resistor values (e.g., R1 = 100 kΩ, R2 = 62 kΩ), the voltage divider scales the 3.3 V rail to ~1.25 V at PFI. When the 3.3 V supply drops below ~3.05 V, PFO asserts low - enabling early-warning shutdown or flagging.
What is the minimum VCC required for valid RESET output from ADM708ARMZ-REEL?
The ADM708ARMZ-REEL guarantees valid RESET output down to VCC = 1.0 V, as stated in the Features section and validated in Figure 6 and Figure 7 of the datasheet. Below 1.0 V, internal drive capability degrades; however, an external pull-down resistor (e.g., 10 kΩ to GND) can extend functional reset assertion to near-zero VCC if required for specific fail-safe designs.
ADM708ARMZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- 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-MSOP
ADM708ARMZ-REEL FAQ
1.How can I place an order for ADM708ARMZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708ARMZ-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 ADM708ARMZ-REEL reliable?
The price and inventory of ADM708ARMZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708ARMZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM708ARMZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708ARMZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708ARMZ-REEL?
ADM708ARMZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708ARMZ-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 ADM708ARMZ-REEL?
For technical support, including ADM708ARMZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708ARMZ-REEL requirements.
6.How does Aetrix verify that ADM708ARMZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM708ARMZ-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 ADM708ARMZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM708ARMZ-REEL?
All ADM708ARMZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM708ARMZ-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 ADM708ARMZ-REEL part is unused and in its original packaging.
Return procedure for ADM708ARMZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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