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Analog Devices Inc. ADM690AARNZ
- Part No.:
- ADM690AARNZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADM690AARNZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:222
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Product details
Overview
ADM690AARNZ from Analog Devices is a precision microprocessor supervisory circuit in an 8-lead microSOIC package, providing active-low reset assertion at 4.65 V nominal threshold, 200 ms reset timeout, 1.6 s watchdog timer, and automatic battery switchover for CMOS RAM backup. It operates with VCC as low as 1 V and supports power-fail detection via 1.25 V PFI comparator.
For engineers reviewing the ADM690AARNZ datasheet, ADM690AARNZ pinout, ADM690AARNZ application, or ADM690AARNZ equivalent, key selection criteria include reset voltage accuracy (±150 mV), battery switchover hysteresis (40 mV), quiescent current (100 µA), and compatibility with 5 V systems requiring guaranteed reset hold-down during brownout.
Technical Context
The ADM690AARNZ integrates four core functions on a single die: a precision bandgap-based voltage monitor triggering RESET at 4.65 V ±150 mV, a monostable watchdog timer with 1.6 s timeout resettable by WDI transitions, a PMOS-based battery switchover switch with 20 mV switchover threshold and 40 mV hysteresis, and a dedicated 1.25 V reference comparator for external power-fail sensing via PFI/PFO.
Its internal architecture uses an epitaxial CMOS process enabling operation down to 1 V VCC while maintaining RESET assertion, and features a low-leakage VBATT path (0.05 µA standby) optimized for lithium or capacitor-based backup sources. The RESET output drives up to 3.2 mA sink current with rail-to-rail logic levels.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±150 mV - ensures reliable reset activation across 4.75–5.5 V supply range with guaranteed hold-down below 1 V VCC. |
| Reset Timeout | 200 ms ±60 ms - provides sufficient stabilization time for 5 V microprocessors after power-up or brownout recovery. |
| Watchdog Timeout | 1.6 s ±650 ms - detects software lockup in embedded firmware without requiring external timing components. |
| Supply Current | 100 µA typical - enables long-term battery-backed operation with minimal drain on 3 V coin cells or supercapacitors. |
| Battery Switchover | 20 mV threshold, 40 mV hysteresis - prevents oscillation during VCC/VBATT crossover and ensures clean transition to backup power. |
| PFI Comparator Ref | 1.25 V ±25 mV - allows accurate power-fail warning for +5 V rails using standard resistor dividers (e.g., R1=100 kΩ, R2=100 kΩ → VT = 2.5 V). |
| Output Drive | 3.2 mA sink / 800 µA source - directly interfaces with TTL/CMOS inputs without external buffering in most 5 V systems. |
Pinout & Package
ADM690AARNZ is housed in an 8-lead microSOIC (RM-8) package measuring 3.10 mm × 3.05 mm × 0.80 mm, optimized for space-constrained industrial and embedded PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Main power input | Accepts 4.75–5.5 V nominal supply; powers internal circuitry and feeds VOUT via internal PMOS switch during normal operation. |
| VBATT | Backup battery input | Connects to 2.8–6 V backup source; automatically switches to VOUT when VCC drops below reset threshold and VBATT exceeds VCC by >20 mV. |
| VOUT | Switched output | Delivers regulated VCC or VBATT to CMOS RAM; supports up to 100 mA load with <1 Ω on-resistance in normal mode. |
| GND | Ground reference | Common return for all analog and digital functions; must be low-impedance connection to minimize noise coupling into reset threshold detection. |
| PFI | Power-fail input | Non-inverting input of 1.25 V comparator; used with external resistor divider to trigger PFO before main supply collapse. |
| PFO | Power-fail output | Active-low open-drain output signaling impending supply failure; sinks up to 3.2 mA to drive NMI or interrupt lines. |
| RESET | Reset output | Active-low push-pull output asserting for ≥200 ms after VCC rises above threshold or WDI timeout; holds low down to 1 V VCC. |
| WDI | Watchdog input | Three-level input (high/low/floating); resets 1.6 s timer on each transition; floating disables watchdog function. |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.65 V reset threshold | Guaranteed 4.5–4.75 V range over –40°C to +85°C enables robust 5 V system reset without external trimming. |
| 1 V minimum VCC operation | Ensures continuous RESET assertion during deep brownout, preventing microprocessor corruption even as supply decays. |
| Integrated battery switchover | Eliminates need for external diodes or MOSFETs; reduces BOM count and PCB area while improving reliability over discrete solutions. |
| 1.25 V precision reference | Enables accurate power-fail detection for any supply rail via simple resistor network-no external reference IC required. |
| Watchdog timer with transition detection | Detects both stuck-high and stuck-low conditions on WDI line, unlike edge-only watchdogs that miss static faults. |
Applications
| Industrial PLCs | Medical Diagnostic Equipment |
|---|---|
Use Scenario: Maintaining volatile configuration memory during AC mains interruption in programmable logic controllers. IC Role / Device Role / Timing Role: Supervisory IC providing battery-backed VOUT to SRAM and generating synchronized RESET pulse on power restoration. Use Value: Prevents loss of ladder logic programs and I/O calibration data during brief outages, eliminating manual reconfiguration. | Use Scenario: Preserving patient parameter history and calibration offsets in portable ultrasound units during battery swap. IC Role / Device Role / Timing Role: Active-low reset generator and seamless VBATT/VCC switchover controller ensuring uninterrupted memory retention. Use Value: Enables hot-swap of primary batteries without resetting device state or losing critical diagnostic session data. |
| Point-of-Sale Terminals | Telecom Line Cards |
Use Scenario: Safeguarding transaction logs and encryption keys during unexpected power loss in retail payment systems. IC Role / Device Role / Timing Role: Voltage monitor and watchdog timer ensuring processor reset and memory backup activation within 200 ms of supply dip. Use Value: Meets PCI-DSS requirement for atomic transaction rollback by guaranteeing deterministic reset timing and non-volatile memory integrity. | Use Scenario: Monitoring +5 V bias supply in carrier-grade DSLAM line cards subject to lightning-induced transients. IC Role / Device Role / Timing Role: Precision 4.65 V reset supervisor with PFI-based early-warning power fail detection feeding FPGA interrupt. Use Value: Triggers graceful service handover before supply collapse, avoiding packet loss and maintaining SLA compliance. |
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 120 µA quiescent current; 4.65 V reset threshold tolerance ±200 mV vs. ±150 mV. | Lacks guaranteed 1 V VCC operation; reset hold-down degrades below 1.2 V. | Choose MAX690A only if legacy design reuse is required and ultra-low-power backup is not critical. |
| TPS3823-46 | 4.63 V reset threshold, 200 ms timeout, but no integrated battery switchover or watchdog timer. | Requires external PMOS and RC network for backup switching; no WDI functionality. | Select TPS3823-46 when only voltage monitoring is needed and board space permits discrete backup circuitry. |
Compared with MAX690A and TPS3823-46, the ADM690AARNZ delivers integrated battery switchover and watchdog functionality in the same microSOIC footprint, reducing total solution size by 35% and eliminating three external components required by the alternatives.
Availability
ADM690AARNZ is available at Aetrix Electronics and suitable for industrial PLCs, medical diagnostic equipment, point-of-sale terminals, and telecom line cards requiring stable component supply with guaranteed long-term availability.
Supply support for ADM690AARNZ 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 ADM690AARNZ belongs to Analog Devices' microprocessor supervisory product line, designed specifically for 5 V embedded systems needing guaranteed reset behavior, battery-backed memory retention, and software execution monitoring in harsh environments.
FAQ
What is the guaranteed operating temperature range for the ADM690AARNZ?
The ADM690AARNZ is rated for industrial operation from –40°C to +85°C, with all specifications-including reset threshold accuracy, watchdog timeout, and battery switchover hysteresis-guaranteed across this full range. This makes ADM690AARNZ suitable for deployment in uncontrolled environments such as factory floors, outdoor kiosks, and vehicle-mounted electronics where ambient temperatures fluctuate widely.
Can the ADM690AARNZ be used with a 3.3 V microprocessor system?
No-the ADM690AARNZ is specified only for 4.75–5.5 V VCC operation and has a fixed 4.65 V reset threshold. Using it with a 3.3 V system would cause immediate, permanent reset assertion. For 3.3 V systems, Analog Devices offers the ADM692A (4.4 V threshold) or newer alternatives like the ADM1185, but ADM690AARNZ itself is incompatible with sub-4.75 V supplies.
How does the ADM690AARNZ handle battery replacement without causing spurious resets?
The ADM690AARNZ prevents spurious resets during battery replacement by isolating VBATT leakage paths: its internal design ensures no current flows from VBATT into other pins when VCC is present and above threshold. As long as VCC remains >4.65 V, floating VBATT during swap causes no reset assertion-unlike older supervisors where VBATT leakage could pull down internal nodes and trigger false resets.
What is the maximum load current supported by the VOUT pin of the ADM690AARNZ?
The VOUT pin of the ADM690AARNZ supports up to 100 mA in normal operation (VCC-connected mode) with <1 Ω typical on-resistance, and up to 250 µA in battery backup mode (VBATT-connected mode) with dropout <5 mV. For loads exceeding 100 mA, an external bypass capacitor (≥0.1 µF) is required at VOUT to supply transient peaks without violating voltage regulation.
Is the ADM690AARNZ RoHS compliant and lead-free?
Yes-the ADM690AARNZ is RoHS compliant and features lead-free (Pb-free) terminations per Analog Devices' packaging standards. The microSOIC (RM-8) package uses matte tin plating over copper leadframe, with JEDEC-standard reflow profiles supporting lead-free assembly. Full compliance documentation, including substance declarations and test reports, is available through Analog Devices' quality portal.
ADM690AARNZ 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:
- 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-SOIC
ADM690AARNZ FAQ
1.How can I place an order for ADM690AARNZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM690AARNZ 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 ADM690AARNZ reliable?
The price and inventory of ADM690AARNZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM690AARNZ is usually 5 days.
3.What payment methods are accepted for ADM690AARNZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM690AARNZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM690AARNZ?
ADM690AARNZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM690AARNZ 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 ADM690AARNZ?
For technical support, including ADM690AARNZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM690AARNZ requirements.
6.How does Aetrix verify that ADM690AARNZ is sourced from the original manufacturer or authorized distributors?
All ADM690AARNZ 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 ADM690AARNZ meets industry standards.
7.What is the process for return or replacement of ADM690AARNZ?
All ADM690AARNZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM690AARNZ, 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 ADM690AARNZ part is unused and in its original packaging.
Return procedure for ADM690AARNZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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