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Analog Devices Inc. ADM708RANZ
- Part No.:
- ADM708RANZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADM708RANZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,298
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Product details
Overview
ADM708RANZ from Analog Devices is a 3 V microprocessor supervisory circuit with dual active-high/active-low reset outputs, 2.63 V precision voltage monitoring threshold, 200 ms reset pulse width, and power-fail warning capability via PFI/PFO. It ensures reliable system initialization and brownout recovery in embedded controllers and battery-powered instrumentation.
For engineers reviewing the ADM708RANZ datasheet, ADM708RANZ pinout, ADM708RANZ application, or ADM708RANZ equivalent, key selection criteria include its dual-reset output architecture, guaranteed RESET validity down to 1 V VCC, debounced manual reset input (MR), 1.25 V power-fail comparator, and compatibility with 3 V/3.3 V supply domains in industrial microprocessor systems.
Technical Context
The ADM708RANZ implements a dual-output reset generator with independent voltage monitoring and power-fail detection. Its internal 2.63 V reference triggers reset assertion when VCC falls below threshold, holding RESET and RESET low/high for 200 ms after recovery. Unlike the ADM706 series, it omits watchdog timer functionality but retains MR debouncing and PFI/PFO comparator circuitry.
It features a 1.25 V precision power-fail comparator with PFI input and open-drain PFO output, enabling early-warning shutdown sequencing. The device operates across −40°C to +85°C and draws only 100 µA quiescent current at VCC < 3.6 V, supporting low-power portable designs requiring stable reset behavior under marginal supply conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V ±70 mV - precisely monitors 3 V supplies; asserts reset before microprocessor undervoltage lockout. |
| Reset Pulse Width | 200 ms typical - provides sufficient time for power supply and processor stabilization during power-up/brownout. |
| Quiescent Current | 100 µA at VCC < 3.6 V - enables long battery life in portable instruments and remote sensors. |
| Valid RESET Down to | VCC = 1 V - guarantees controlled shutdown even during deep supply collapse. |
| Power-Fail Threshold | 1.25 V on PFI - allows configurable early-warning detection of supply decay via external resistor divider. |
| MR Input Pull-Up | 70 µA internal - eliminates need for external pull-up; supports direct switch or logic-level reset assertion. |
| Operating Temp | −40°C to +85°C - qualified for industrial-grade embedded control and automotive-adjacent applications. |
Pinout & Package
ADM708RANZ is housed in an 8-lead narrow-body PDIP (N-8) package per JEDEC MS-001, with 0.300-inch body width and 0.100-inch lead pitch. Pin 1 is marked by a notch or dot; leads are tin-lead plated and RoHS-compliant.
| 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 (2.7–5.5 V); requires 0.1 µF decoupling capacitor to GND for noise immunity. |
| 3 GND | Ground Reference | Common return path for all analog and digital functions; must be low-impedance connection. |
| 4 PFI | Power-Fail Input | Noninverting input to 1.25 V comparator; monitors auxiliary supply via resistive divider; connect to GND if unused. |
| 5 PFO | Power-Fail Output | Open-drain output that goes low when PFI < 1.25 V; used to trigger orderly shutdown or NMI interrupt. |
| 6 NC | No Connect | Internally unconnected; must remain floating-no external connection permitted. |
| 7 RESET | Active-Low Reset Output | Push-pull output asserted low for 200 ms during power-up/brownout/MR event; valid down to VCC = 1 V. |
| 8 RESET | Active-High Reset Output | Complementary push-pull output asserted high for same duration; supports bidirectional or legacy-active-high MCU reset lines. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 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 | Ensures deterministic microprocessor hold state during final stage of power collapse-critical for data retention and safe state capture. |
| Debounced Manual Reset | 200 ms internal timing eliminates mechanical switch bounce without external RC network or firmware polling. |
| Configurable Power-Fail Warning | PFI/PFO pair enables user-defined early-warning threshold (e.g., 4.5 V on 5 V rail) for graceful shutdown before brownout. |
| Low Quiescent Current | 100 µA operation extends battery life in always-on monitoring nodes and portable test equipment. |
Applications
| Industrial Controller Monitoring | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: PLC I/O modules powered from 3.3 V rails subject to intermittent brownouts in factory environments. IC Role / Device Role / Timing Role: Supervisory IC providing synchronized power-on reset and brownout recovery for ARM Cortex-M4-based controller. Use Value: Dual RESET/RESET outputs interface directly with both FPGA configuration logic (active-low) and MCU reset pin (active-high), eliminating level-shifting components. |
Use Scenario: Handheld blood glucose meter operating from single-cell Li-ion battery with declining voltage profile. IC Role / Device Role / Timing Role: Voltage monitor and reset generator ensuring safe shutdown before battery reaches 2.8 V cutoff. Use Value: PFI input configured to detect 3.0 V supply decay; PFO triggers EEPROM save sequence 200 ms before RESET assertion. |
| Smart Energy Metering | Automotive Diagnostic Tool |
|
Use Scenario: DIN-rail mounted electricity meter with isolated 3 V logic domain and AC mains-derived auxiliary supply. IC Role / Device Role / Timing Role: Primary supervisor for metrology SoC; PFI monitors preregulator output to anticipate AC dropout. Use Value: 200 ms reset pulse aligns with EN pin timing requirements of isolated DC-DC converter, preventing race conditions during recovery. |
Use Scenario: OBD-II scanner using USB-powered 3.3 V LDO with transient load spikes causing momentary dips. IC Role / Device Role / Timing Role: System-level reset arbiter asserting both active-high and active-low signals to MCU and display driver ICs. Use Value: MR input tied to front-panel reset button with hardware debounce; eliminates firmware reset-handling overhead and improves field serviceability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM706RANZ | Includes watchdog timer (1.6 s timeout) and WDI/WDO pins; single active-low RESET output only. | Suitable where software hang detection is required; not compatible if dual-reset output or absence of watchdog is mandatory. | Select ADM706RANZ only if watchdog supervision is needed and board layout accommodates WDI routing. |
| MAX708RCSA+ | Pin-compatible Maxim replacement; identical 2.63 V threshold, dual reset outputs, and PFI/PFO; 120 µA typical quiescent current. | Drop-in substitute with same footprint and function; slightly higher supply current but same timing and voltage specs. | Choose MAX708RCSA+ for second-source assurance where Analog Devices supply continuity is constrained. |
Compared with ADM708RANZ, ADM706RANZ adds watchdog capability at the cost of losing active-high reset, while MAX708RCSA+ offers identical dual-reset functionality with marginally higher quiescent draw-making ADM708RANZ optimal for watchdog-free, ultra-low-power 3 V systems requiring both reset polarities.
Availability
ADM708RANZ is available at Aetrix Electronics and suitable for industrial controller monitoring, portable medical instrumentation, and smart energy metering requiring stable component supply, long-term lifecycle support, and guaranteed parametric performance across temperature.
Supply support for ADM708RANZ 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.
The ADM708 series belongs to Analog Devices' microprocessor supervisory product line, designed specifically for robust power monitoring and reset generation in 3 V/3.3 V embedded systems where reliability under voltage transients is critical.
FAQ
What is the reset threshold voltage of the ADM708RANZ?
The ADM708RANZ has a precision reset threshold of 2.63 V, with ±70 mV tolerance over temperature and supply. This value is factory-trimmed and applies across the full −40°C to +85°C operating range. The threshold ensures reliable reset assertion before most 3 V microcontrollers enter undefined states, and it is distinct from the 1.25 V power-fail comparator reference used on the PFI pin.
Does the ADM708RANZ include a watchdog timer function?
No, the ADM708RANZ does not include a watchdog timer. Unlike the ADM706RANZ, it omits the WDI and WDO pins entirely-pin 6 is designated NC (No Connect). Its functional block diagram confirms dedicated reset generation and power-fail detection only. If watchdog supervision is required, ADM706RANZ or ADM706RARZ are appropriate alternatives.
How does the ADM708RANZ handle reset assertion when VCC drops below 1 V?
The ADM708RANZ guarantees valid RESET and RESET outputs down to VCC = 1 V. Below this level, internal drive capability degrades; the datasheet recommends adding an external 10 kΩ pull-down resistor from RESET to GND if sustained low-state enforcement is required during deep undervoltage. This ensures fail-safe behavior in battery-dead scenarios without relying on internal transistor conduction.
Can the PFI input of the ADM708RANZ monitor a 5 V supply?
Yes, the PFI input can monitor a 5 V supply using an external resistive divider. Since PFI's absolute maximum rating is VCC + 0.3 V, and ADM708RANZ operates up to 5.5 V, a two-resistor network (e.g., 100 kΩ from 5 V to PFI, 25 kΩ from PFI to GND) scales 5 V to 1.0 V at PFI-below the 1.25 V trip point. When the 5 V rail decays to ~4.7 V, PFI crosses 1.25 V, triggering PFO low for early warning.
What is the purpose of the NC pin on the ADM708RANZ?
Pin 6 on the ADM708RANZ is designated NC (No Connect) and is internally unconnected. It must remain floating-no external component or trace should attach to it. This pin reflects the package pinout shared with the watchdog-enabled ADM706 family (where it serves as WDI), but in ADM708RANZ, the watchdog circuitry is absent and the pin has no electrical function.
ADM708RANZ 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:
- 2.63V
- 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
ADM708RANZ FAQ
1.How can I place an order for ADM708RANZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM708RANZ 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 ADM708RANZ reliable?
The price and inventory of ADM708RANZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM708RANZ is usually 5 days.
3.What payment methods are accepted for ADM708RANZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM708RANZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM708RANZ?
ADM708RANZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM708RANZ 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 ADM708RANZ?
For technical support, including ADM708RANZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM708RANZ requirements.
6.How does Aetrix verify that ADM708RANZ is sourced from the original manufacturer or authorized distributors?
All ADM708RANZ 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 ADM708RANZ meets industry standards.
7.What is the process for return or replacement of ADM708RANZ?
All ADM708RANZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM708RANZ, 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 ADM708RANZ part is unused and in its original packaging.
Return procedure for ADM708RANZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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