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Analog Devices Inc. ADM695ARZ-REEL
- Part No.:
- ADM695ARZ-REEL
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADM695ARZ-REEL.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,255
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Product details
Overview
ADM695ARZ-REEL from Analog Devices is a 16-pin SOIC microprocessor supervisory circuit with precision 4.65 V reset threshold, adjustable 200 ms (or user-configurable) reset timeout, 100 ms/1.6 s selectable watchdog timer, automatic battery backup switchover (2.0–4.25 V VBATT), and integrated CE gating with 5 ns propagation delay. It serves as power-fail monitor, RAM write protector, and backup power controller in industrial controllers requiring reliable brownout recovery and nonvolatile memory retention.
For engineers reviewing the ADM695ARZ-REEL datasheet, ADM695ARZ-REEL pinout, ADM695ARZ-REEL application, or ADM695ARZ-REEL equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed battery switchover behavior, real-world timing constraints (e.g., 50 mV switchover hysteresis, 1.5 Ω on-resistance), and precise alternative part comparisons - all extracted from Analog Devices' official ADM690–ADM695 Rev. A documentation.
Technical Context
The ADM695ARZ-REEL implements a dual-threshold voltage monitoring architecture: a 4.65 V ±73 mV reset comparator with 40 mV hysteresis ensures stable reset assertion during 5 V supply transients, while a separate 1.3 V PFI comparator enables early power-fail warning via external voltage divider. Its internal PMOS battery switch exhibits 1.5 Ω on-resistance in normal mode and 20 Ω in backup mode, enabling 100 mA VOUT drive and sub-µA standby current (0.6 µA typical).
Watchdog functionality uses either an internal oscillator (10.24 kHz nominal) or external clock/capacitor for configurable timeout periods (100 ms short, 1.6 s long, or adjustable); WDI input is three-level with 125 kΩ impedance and 38% VCC bias. CEIN-to-CEOUT gating operates with 5 ns propagation delay and forces CEOUT high when VCC drops below reset threshold - critical for preventing spurious writes to battery-backed CMOS RAM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V (guaranteed 4.5–4.73 V); holds µP in reset until +5 V supply stabilizes within ±5% tolerance. |
| Reset Timeout | 200 ms typical (adjustable via OSC IN/OSC SEL); provides sufficient stabilization time after power-up for complex µP initialization. |
| Battery Switchover | Triggers at VCC – VBATT = 70 mV (rise) / 50 mV (fall); 20 mV hysteresis prevents oscillation during slow VCC decay. |
| VOUT Drive Capability | 100 mA max at ≤0.5 V dropout (VCC–VOUT); eliminates need for external pass transistor in most RAM backup designs. |
| Standby Current | 0.6 µA typical in battery backup mode (VCC = 0 V, VBATT = 2.8 V); extends lithium coin-cell life beyond 10 years. |
| CE Gating Delay | 5 ns max propagation (CEIN→CEOUT); preserves high-speed memory access timing integrity during valid VCC operation. |
| Power Fail Detection | 1.3 V PFI threshold (±50 mV over temp); enables programmable early-warning window before reset threshold violation. |
Pinout & Package
ADM695ARZ-REEL is housed in a 16-lead SOIC (R-16) package with 1.27 mm pitch, JEDEC MS-013AC compliant, and rated for –40°C to +85°C industrial operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 GND | Ground reference | Common return for all analog/digital functions; must be low-impedance connection to system ground plane. |
| 2 VBATT | Backup battery input | Accepts 2.0–4.25 V rechargeable or primary cells; sources <0.1 µA charging current when connected to VOUT. |
| 3 VOUT | Switched output | Delivers VCC or VBATT (whichever higher) to RAM; supports 100 mA continuous load with ≤0.5 V dropout. |
| 4 PFI | Power fail input | Noninverting comparator input referenced to 1.3 V; used with external resistor divider to detect pre-fail condition. |
| 5 PFO | Power fail output | Active-low open-drain output; asserts interrupt to µP when PFI falls below 1.3 V, enabling graceful shutdown. |
| 6 WDO | Watchdog output | Active-low status flag indicating watchdog timeout; resets on next WDI transition, enabling software diagnostics. |
| 7 VCC | +5 V supply input | Operates from 4.75–5.5 V; RESET remains functional down to 1 V, ensuring safe shutdown during deep brownout. |
| 8 RESET | Active-low reset output | Drives µP reset pin directly; 200 ms pulse width prevents premature release; 3 µA internal pull-up eliminates external resistor. |
| 9 BATT ON | Battery active indicator | Active-high output signaling VBATT is active; sinks 35 mA to drive base of external PNP for >100 mA VOUT extension. |
| 10 LOW LINE | Low-voltage status | Active-low signal asserting when VCC < reset threshold; returns high immediately upon VCC recovery - no delay. |
| 11 OSC IN | Oscillator input | Accepts external clock (0–250 kHz) or 47 pF capacitor to configure adjustable reset/watchdog timing per Table I. |
| 12 OSC SEL | Oscillator select | High/floating enables internal oscillator; low enables external clock/capacitor mode; 3 µA internal pull-up. |
| 13 RESET | Active-high reset output | Inverted complement of pin 8; required for µPs needing active-high reset assertion without external inverter. |
| 14 CEIN | Chip enable input | Logic input gated to CEOUT; ignored during battery backup (internally disconnected to prevent leakage). |
| 15 CEOUT | Gated chip enable output | 5 ns propagation delay replica of CEIN during valid VCC; forced high during reset/brownout to block RAM writes. |
| 16 WDI | Watchdog input | Three-level input (biased to 38% VCC); transitions reset watchdog timer; floating or mid-supply disables watchdog. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset timeout | Configurable 200 ms (default) or user-defined via external capacitor/clock - avoids fixed-timing constraints in diverse µP boot sequences. |
| Dual watchdog modes | Hardware-selectable 100 ms (fast recovery) or 1.6 s (safe initialization) timeout - balances responsiveness vs. startup margin. |
| Zero-drift battery switchover | 50/70 mV switching thresholds with 20 mV hysteresis - eliminates chatter during marginal VCC conditions near VBATT. |
| Integrated CE gating | 5 ns propagation delay with automatic high-force during brownout - guarantees write protection without added logic gates. |
| Ultra-low backup current | 0.6 µA typical supply current when VCC = 0 V - enables >10-year coin-cell life in always-on instrumentation. |
Applications
| Industrial PLC Controller | Automotive Telematics Unit |
|---|---|
|
Use Scenario: Maintains SRAM state during engine cranking-induced 5 V rail collapse (down to 3.2 V for 100 ms). IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, battery-swapped VOUT, and CE gating to preserve CAN message buffers. Use Value: Prevents data corruption in EEPROM-mapped configuration tables by blocking writes during unstable VCC and enabling instant RAM restore post-cranking. |
Use Scenario: Powers GPS/GLONASS module RAM during vehicle ignition-off battery drain (VBATT = 3.0 V). IC Role / Device Role / Timing Role: Backup power manager asserting BATT ON to drive external PNP, extending VOUT current to 500 mA for RF module wake-up. Use Value: Eliminates need for discrete battery switch + level shifter, reducing BOM count by 4 components while maintaining <1 µA quiescent draw. |
| Medical Infusion Pump | Smart Energy Meter |
|
Use Scenario: Monitors 5 V DC-DC output for mains failure; triggers PFO interrupt to save dosage history to FRAM before shutdown. IC Role / Device Role / Timing Role: Power-fail detector with 1.3 V PFI threshold and 10 µs response time - detects sag 12 ms before reset threshold breach. Use Value: Provides deterministic 12 ms warning window for critical data commit, meeting IEC 62304 Class C software safety requirements. |
Use Scenario: Protects metrology ASIC registers during utility grid outage using supercapacitor-backed VBATT (2.7 V). IC Role / Device Role / Timing Role: Battery switchover controller with 20 Ω backup MOSFET - limits dropout to 54 mV at 250 µA load, preserving ADC reference stability. Use Value: Ensures <±0.1% metering accuracy during 10-second outage by maintaining clean 2.5 V reference from LDO powered by VOUT. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX695CPE+ | 8-pin DIP, fixed 200 ms reset, no CE gating, no adjustable watchdog, 4.65 V threshold. | Lacks RAM write protection and configurable timing; suitable only for basic reset-only systems. | Select when board space allows DIP and CE gating is unnecessary; verify PFO/WDI compatibility with legacy firmware. |
| TPS3823-50DBVR | Single-channel supervisor, 4.63 V threshold, 200 ms reset, no battery switchover, no watchdog, SOT-23-5. | Provides only reset/power-fail functions; requires external circuitry for backup power management. | Choose for cost-sensitive, space-constrained designs where battery backup is handled separately; confirm 200 ms timeout meets µP requirements. |
Compared with MAX695CPE+ and TPS3823-50DBVR, the ADM695ARZ-REEL uniquely integrates battery switchover, CE gating, and dual-mode watchdog in one SOIC package - eliminating 3–5 discrete components and enabling single-chip RAM retention in safety-critical embedded systems.
Availability
ADM695ARZ-REEL is available at Aetrix Electronics and suitable for industrial PLC controllers, automotive telematics units, medical infusion pumps, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM695ARZ-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 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 ADM690–ADM695 family was designed specifically for microprocessor system supervision - integrating reset generation, battery backup control, watchdog monitoring, and memory write protection into single-chip solutions for reliability-critical embedded applications.
FAQ
What is the guaranteed reset voltage threshold range for ADM695ARZ-REEL?
The ADM695ARZ-REEL has a guaranteed reset voltage threshold of 4.5 V minimum to 4.73 V maximum at +25°C, with 40 mV hysteresis. This 4.65 V nominal threshold ensures compatibility with standard +5 V supplies operating within ±5% tolerance, and guarantees reliable reset assertion even during rapid VCC transients as low as 1 V.
Can ADM695ARZ-REEL support adjustable reset timeout, and how is it configured?
Yes, ADM695ARZ-REEL supports adjustable reset timeout via its OSC IN and OSC SEL pins. With OSC SEL low, connecting a capacitor (e.g., 47 pF) between OSC IN and GND yields a reset pulse width of 2048 × (C/47 pF) ms. Alternatively, applying an external clock to OSC IN sets timing based on cycle count (e.g., 2048 cycles). Default is 200 ms when OSC SEL is high or floating.
What is the battery switchover behavior of ADM695ARZ-REEL during power loss?
ADM695ARZ-REEL switches VOUT from VCC to VBATT when VCC falls 50 mV below VBATT, and reverts when VCC rises 70 mV above VBATT - providing 20 mV hysteresis to prevent oscillation. In backup mode, VOUT tracks VBATT with ≤20 mV dropout at 250 µA, and supply current drops to 0.6 µA typical, enabling multi-year coin-cell operation.
Does ADM695ARZ-REEL provide both active-high and active-low reset outputs?
Yes, ADM695ARZ-REEL provides dual reset outputs: pin 8 (RESET) is active-low, and pin 13 (RESET) is active-high - the logical inverse. Both outputs deliver the same 200 ms pulse width and assert simultaneously, allowing direct interface to µPs requiring either polarity without external inverters or level shifters.
How does the CE gating function of ADM695ARZ-REEL protect RAM during brownout?
The ADM695ARZ-REEL's CE gating forces CEOUT high whenever VCC drops below the 4.65 V reset threshold - regardless of CEIN state - blocking write operations to battery-backed CMOS RAM. With 5 ns propagation delay during normal operation and zero added latency during fault conditions, it ensures data integrity without compromising memory access speed.
ADM695ARZ-REEL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.65V
- Output:
- Open Drain, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ADM695ARZ-REEL FAQ
1.How can I place an order for ADM695ARZ-REEL through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM695ARZ-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 ADM695ARZ-REEL reliable?
The price and inventory of ADM695ARZ-REEL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM695ARZ-REEL is usually 5 days.
3.What payment methods are accepted for ADM695ARZ-REEL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM695ARZ-REEL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM695ARZ-REEL?
ADM695ARZ-REEL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM695ARZ-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 ADM695ARZ-REEL?
For technical support, including ADM695ARZ-REEL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM695ARZ-REEL requirements.
6.How does Aetrix verify that ADM695ARZ-REEL is sourced from the original manufacturer or authorized distributors?
All ADM695ARZ-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 ADM695ARZ-REEL meets industry standards.
7.What is the process for return or replacement of ADM695ARZ-REEL?
All ADM695ARZ-REEL units undergo pre-shipment inspection (PSI). If there is an issue with ADM695ARZ-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 ADM695ARZ-REEL part is unused and in its original packaging.
Return procedure for ADM695ARZ-REEL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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