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Analog Devices Inc. ADM690AARMZ
- Part No.:
- ADM690AARMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADM690AARMZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,281
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Product details
Overview
ADM690AARMZ from Analog Devices is a precision microprocessor supervisory circuit in an 8-pin microSOIC package, providing active-low reset (RESET), watchdog timer (1.6 s timeout), battery switchover, and power-fail detection (1.25 V threshold). It asserts reset down to VCC = 1 V, supports 4.65 V reset threshold, and delivers up to 100 mA VOUT drive for CMOS RAM backup in embedded controllers.
For engineers reviewing the ADM690AARMZ datasheet, ADM690AARMZ pinout, ADM690AARMZ application, or ADM690AARMZ equivalent, key selection considerations include its guaranteed 4.65 V ±25 mV reset threshold, 200 ms reset timeout, battery switchover hysteresis of 40 mV, and compatibility with +5 V systems requiring robust brownout and watchdog protection.
Technical Context
The ADM690AARMZ integrates four core supervision functions on a single die: a precision bandgap-referenced voltage monitor for VCC, a transition-detecting watchdog timer with 1.6 s timeout and edge-triggered WDI input, a PMOS-based battery switchover switch with <1 Ω on-resistance and 40 mV hysteresis, and a dedicated 1.25 V reference comparator for PFI/PFO power-fail signaling.
Its internal architecture ensures RESET remains functional at VCC as low as 1 V via dedicated low-voltage biasing, while the VOUT output dynamically routes between VCC and VBATT based on real-time voltage comparison - not fixed thresholds - enabling seamless backup during brownout without external logic.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V (±25 mV), ensuring reliable reset assertion before +5 V supply instability affects microprocessor operation |
| Reset Timeout Delay | 200 ms (140–280 ms range), providing sufficient stabilization time for power supplies and microprocessors after power-up |
| Watchdog Timeout | 1.6 s (1.0–2.25 s), enabling software loop monitoring without excessive false triggers in real-time embedded firmware |
| VCC Operating Range | 1.0 V to 5.5 V, guaranteeing reset hold-down and functional supervision even during deep brownout conditions |
| Supply Current | 100 µA typical, minimizing standby power impact in battery-backed systems |
| Battery Backup Current | 0.05 µA typical, extending shelf life of 3 V lithium or capacitor-based backup sources |
| PFI Threshold | 1.25 V (±25 mV), supporting accurate early-warning power-fail detection using simple resistor dividers |
Pinout & Package
ADM690AARMZ uses an 8-lead microSOIC (RM-8) package measuring 3.10 mm × 3.05 mm × 0.80 mm, optimized for space-constrained industrial and portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power supply input | +5 V nominal supply rail; powers internal circuitry and feeds VOUT when above reset threshold |
| VBATT | Backup battery input | Connects to 2.8–3.6 V backup source; automatically switches to VOUT when VCC drops below VBATT −20 mV |
| VOUT | Supervised output voltage | Delivers regulated system power to CMOS RAM or low-power peripherals; sourced from VCC or VBATT depending on switchover state |
| GND | Ground reference | Common return path for all analog and digital functions; required for accurate voltage monitoring and reset timing |
| PFI | Power fail comparator input | Accepts divided-down supply voltage; triggers PFO low when input falls below 1.25 V reference |
| PFO | Power fail output | Active-low open-drain signal used to interrupt microprocessor NMI or initiate controlled shutdown sequence |
| RESET | Reset output | Active-low push-pull output asserting for ≥200 ms upon VCC drop below 4.65 V or WDI timeout |
| WDI | Watchdog input | Three-level input (high/low/floating); resets watchdog timer on each edge; floating disables watchdog function |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed reset operation down to VCC = 1 V | Ensures microprocessor remains held in reset during deep brownout, preventing undefined execution states |
| Integrated battery switchover with 40 mV hysteresis | Eliminates need for external diodes or MOSFET controllers while preventing oscillation during VCC/VBATT crossover |
| 1.25 V precision internal reference for PFI | Enables accurate, temperature-stable power-fail detection across –40°C to +85°C without external references |
| Edge-triggered watchdog with 1.6 s timeout | Reduces false resets caused by noise or slow edges; requires only periodic I/O toggling, not precise timing |
| MicroSOIC (RM-8) footprint | Reduces PCB area by >50% vs. standard SOIC-8, critical for compact instrumentation and portable control modules |
Applications
| Industrial PLC Controller | Medical Diagnostic Instrument |
|---|---|
Use Scenario: Power supervision in DIN-rail mounted programmable logic controllers exposed to fluctuating 24 V DC supplies converted to +5 V. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, watchdog safety monitoring, and nonvolatile RAM backup during mains interruption. Use Value: Prevents program corruption during line sags by asserting RESET before VCC drops below 4.65 V and maintaining RAM power via VBATT switchover. | Use Scenario: Embedded controller in portable ultrasound or blood glucose analyzers requiring long-term data retention during battery swaps. IC Role / Device Role / Timing Role: Microprocessor supervisor managing safe shutdown, RAM backup, and early power-fail warning prior to battery depletion. Use Value: Uses PFI/PFO to trigger data save routines 100+ ms before shutdown, while 0.05 µA backup current extends coin-cell life beyond 10 years. |
| Telecom Remote Terminal Unit | Automotive Body Control Module |
Use Scenario: Outdoor base station RTU operating on solar-charged batteries with intermittent 5 V regulation. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors main +5 V rail and provides watchdog oversight of communication stack firmware. Use Value: WDI input tied to UART TX line ensures automatic recovery from firmware hangs without manual intervention or network reset commands. | Use Scenario: Low-power BCM in 12 V automotive systems where +5 V MCU supply may dip during cranking or load dump events. IC Role / Device Role / Timing Role: Brownout protector and RAM keeper, asserting RESET before VCC falls below 4.65 V and switching to backup capacitor during engine start. Use Value: 1 V minimum VCC operation guarantees reset hold until supply recovers, preventing EEPROM write corruption during transient dips. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX690A | Pin-compatible but higher quiescent current (120 µA vs. 100 µA); no guaranteed 1 V reset operation | Lacks battery switchover hysteresis specification; less robust in marginal VCC/VBATT crossover conditions | Use only if legacy MAX690A footprint reuse is mandatory and 1 V reset guarantee is not required |
| TPS3823-46DBVR | Different reset threshold (4.63 V), no integrated battery switchover or PFI/PFO comparator | Requires external components for backup power management and power-fail warning functionality | Select when only basic reset + watchdog is needed and board space allows discrete backup circuitry |
Compared with MAX690A and TPS3823-46DBVR, the ADM690AARMZ uniquely combines guaranteed sub-1 V reset hold, integrated battery switchover with hysteresis, and a dedicated 1.25 V power-fail comparator - all in a space-saving microSOIC package - making it optimal for compact, self-contained supervision in battery-backed industrial controllers.
Availability
ADM690AARMZ is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic instruments, telecom remote terminals, and automotive body control modules requiring stable component supply and long-term lifecycle support.
Supply support for ADM690AARMZ 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 semiconductor leader specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The ADM690AARMZ belongs to Analog Devices' microprocessor supervisory circuits product line, engineered specifically for robust power monitoring, fail-safe reset generation, and battery-backed memory preservation in harsh industrial and embedded environments.
FAQ
What is the guaranteed reset voltage threshold for ADM690AARMZ?
The ADM690AARMZ has a guaranteed reset voltage threshold of 4.65 V, with a minimum of 4.5 V and maximum of 4.75 V across the full industrial temperature range (–40°C to +85°C). This threshold is factory-trimmed and specified in the absolute maximum and electrical characteristics tables of the official Analog Devices datasheet for ADM690AARMZ, ensuring consistent brownout detection in +5 V systems.
Does ADM690AARMZ support battery backup switchover, and what is its hysteresis?
Yes, ADM690AARMZ supports automatic battery backup switchover between VCC and VBATT. Its switchover hysteresis is 40 mV - meaning it transitions from VCC to VBATT when VCC falls 20 mV below VBATT, and reverts to VCC when VCC rises 20 mV above VBATT. This hysteresis prevents oscillation during voltage crossovers and is explicitly confirmed in the "Battery Switchover Hysteresis" parameter of the ADM690AARMZ datasheet.
Can ADM690AARMZ operate with VCC below 2.0 V, and down to what level does RESET remain asserted?
Yes, ADM690AARMZ operates with VCC as low as 1.0 V, and RESET remains asserted (low) down to that level. This is a guaranteed specification - not typical - and enables reliable microprocessor hold-down during severe brownout conditions. The datasheet confirms RESET assertion is functional at VCC = 1 V, which is critical for preserving system state in unregulated or failing power environments.
What is the watchdog timeout period for ADM690AARMZ, and how is it triggered?
The watchdog timeout period for ADM690AARMZ is 1.6 seconds, with a guaranteed range of 1.0 s to 2.25 s. It is triggered by lack of transition (edge) on the WDI pin - either high-to-low or low-to-high - within that interval. Each valid edge resets the timer; floating WDI disables the watchdog. This behavior is defined in the "Watchdog Timeout Period" and "WDI Input Pulse Width" specifications for ADM690AARMZ.
Is ADM690AARMZ compatible with the MAX690A, and what are the key functional differences?
ADM690AARMZ is pin-compatible with MAX690A and marketed as a direct upgrade, but key differences exist: ADM690AARMZ guarantees RESET operation down to VCC = 1 V (MAX690A does not), offers lower quiescent current (100 µA vs. 120 µA), and specifies tighter reset threshold tolerance (±25 mV vs. ±50 mV). These improvements are documented in Analog Devices' ADM690AARMZ datasheet under "Features" and "Specifications" sections.
ADM690AARMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
ADM690AARMZ FAQ
1.How can I place an order for ADM690AARMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM690AARMZ 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 ADM690AARMZ reliable?
The price and inventory of ADM690AARMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM690AARMZ is usually 5 days.
3.What payment methods are accepted for ADM690AARMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM690AARMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM690AARMZ?
ADM690AARMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM690AARMZ 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 ADM690AARMZ?
For technical support, including ADM690AARMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM690AARMZ requirements.
6.How does Aetrix verify that ADM690AARMZ is sourced from the original manufacturer or authorized distributors?
All ADM690AARMZ 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 ADM690AARMZ meets industry standards.
7.What is the process for return or replacement of ADM690AARMZ?
All ADM690AARMZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM690AARMZ, 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 ADM690AARMZ part is unused and in its original packaging.
Return procedure for ADM690AARMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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