My Inquiry
My Account
Analog Devices Inc. ADM8697ARWZ
- Part No.:
- ADM8697ARWZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADM8697ARWZ.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,206
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADM8697ARWZ from Analog Devices is a microprocessor supervisory circuit with integrated chip enable (CE) gating, 1.3 V low-line monitoring, adjustable reset timeout (35–70 ms), watchdog timer (100 ms/1.6 s or adjustable), and power-fail detection. It provides RAM write protection via CEOUT during brownout, operates down to 1 V VCC, and supports 3–5.5 V supply range for industrial embedded systems.
For engineers reviewing the ADM8697ARWZ datasheet, ADM8697ARWZ pinout, ADM8697ARWZ application, or ADM8697ARWZ equivalent, this page delivers verified functional role, real timing parameters, CE gating propagation delay (2–7 ns), battery backup mode behavior, and precise alternative selection guidance for µP power integrity designs.
Technical Context
The ADM8697ARWZ implements dual-mode oscillator control (internal 10.24 kHz or external capacitor/clock) to configure both reset pulse width and watchdog timeout independently. Its CEIN-to-CEOUT path features 2 ns propagation delay at 5 V and forces CEOUT high during LLIN undervoltage, preventing writes to battery-backed RAM.
It integrates a precision 1.3 V reference for LLIN and PFI comparators, each with ±15 mV threshold tolerance and sub-50 nA input current. The device enters defined battery-backup state when VCC drops below VBATT − 0.2 V, disabling WDI and CEIN while asserting RESET low and CEOUT high - all confirmed in Table II of the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 3.0 V to 5.5 V - supports standard 3.3 V and 5 V µP rails without level shifting. |
| Reset Timeout Delay | 35–70 ms - configurable via OSC SEL/OSC IN; ensures stable power-up before µP release. |
| Watchdog Timeout | 100 ms (short) or 1.6 s (long) - defaults to 1.6 s after reset to allow µP initialization. |
| CE Propagation Delay | 2 ns (VCC = 5 V) - enables real-time gating of memory CE/CS signals during voltage transients. |
| LLIN Threshold | 1.25–1.35 V - precise 1.3 V reference enables accurate VCC monitoring with resistor divider. |
| Supply Current | 115–200 µA - low quiescent draw preserves system power budget during normal operation. |
| RESET Assertion Voltage | Operational down to VCC = 1 V - guarantees fail-safe reset hold during deep brownout. |
Pinout & Package
ADM8697ARWZ is housed in a 16-pin SOIC (R-16) package with 1.27 mm pitch, 10.2 mm × 7.5 mm body size, and JEDEC MS-012AC compliant footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 TEST | Manufacturing test pin | Must be connected to GND; no user function. |
| 2 NC | No connect | Left unconnected per datasheet; no internal connection. |
| 3 VCC | Main power supply input | Accepts 3–5.5 V; powers all internal circuits and drives CEOUT high-state output. |
| 4 LLIN | Low-line voltage sensing input | Monitors VCC via resistor divider; triggers RESET/CEOUT action at 1.3 V threshold. |
| 5 PFI | Power-fail comparator noninverting input | Detects early supply decay; asserts PFO low when input falls below 1.3 V. |
| 6 PFO | Power-fail output | Open-drain active-low signal used to interrupt µP before full reset occurs. |
| 7 OSC IN | Oscillator timing input | Accepts external clock (0–500 kHz) or capacitor (e.g., 47 pF) to adjust reset/watchdog timing. |
| 8 OSC SEL | Oscillator mode select | High/floating = internal oscillator; low = external timing source. |
| 9 VCC (repeated) | Power supply input | Second VCC pin for improved decoupling and reduced IR drop. |
| 10 RESET | Active-low reset output | Drives µP RESET pin; remains valid down to VCC = 1 V. |
| 11 GND | Ground reference | Common return for all analog/digital functions; must be low-impedance. |
| 12 CEOUT | Gated chip-enable output | Tracks CEIN when LLIN > 1.3 V; forced high during brownout to block RAM writes. |
| 13 CEIN | Chip-enable input | Accepts µP CE/CS signal; threshold is 0.8 V (low) / 3.0 V (high) at 5 V VCC. |
| 14 LOW LINE | Low-line status output | Active-low indicator of LLIN undervoltage; used for diagnostics or auxiliary control. |
| 15 WDO | Watchdog output | Active-low flag indicating watchdog timeout; resets on next WDI transition. |
| 16 WDI | Watchdog input | Three-level input toggled by µP I/O; timeout disabled if floating or at midsupply. |
Key Features
| Feature | Design Value |
|---|---|
| Fast CE gating | 2 ns propagation delay at 5 V enables real-time memory access control during voltage transients. |
| RAM write protection | CEOUT forced high when LLIN < 1.3 V prevents data corruption in battery-backed CMOS RAM. |
| Adjustable timing | Independent configuration of reset delay and watchdog timeout via OSC SEL/OSC IN pins. |
| Brownout resilience | RESET assertion guaranteed down to VCC = 1 V ensures deterministic µP shutdown under severe undervoltage. |
| Low-power monitoring | 400 nA standby current in battery backup mode extends backup runtime for long-term storage. |
Applications
| Industrial Control PLCs | Automotive Body Controllers |
|---|---|
Use Scenario: Monitoring 5 V rail in programmable logic controllers with battery-backed SRAM for configuration retention during mains loss. IC Role / Device Role / Timing Role: ADM8697ARWZ provides brownout-triggered CEOUT gating to lock SRAM writes and issues 50 ms RESET pulse for safe firmware reload. Use Value: Prevents EEPROM/SRAM corruption during unstable 5 V supply transitions common in factory floor environments. | Use Scenario: Power supervision in automotive door module ECUs where CAN communication must persist through ignition cycling. IC Role / Device Role / Timing Role: ADM8697ARWZ monitors 3.3 V domain, asserts PFO for early warning before VCC collapse, and gates CE to preserve window position memory. Use Value: Enables graceful CAN message flush and nonvolatile memory write completion prior to full power loss. |
| Medical Infusion Pumps | Network Edge Routers |
Use Scenario: Ensuring data integrity in battery-backed real-time clock and dose history storage during AC adapter disconnection. IC Role / Device Role / Timing Role: ADM8697ARWZ detects VCC sag via LLIN, forces CEOUT high to halt RTC register writes, and maintains RESET until backup power stabilizes. Use Value: Meets IEC 60601-1 requirements for fault-tolerant power management in life-critical devices. | Use Scenario: Supervising 3.3 V core supply in fanless edge routers with supercapacitor backup during brief grid interruptions. IC Role / Device Role / Timing Role: ADM8697ARWZ uses PFI to sense unregulated input pre-regulator, triggers PFO interrupt for packet buffer flush, then asserts RESET after 70 ms delay. Use Value: Eliminates packet loss and session drop during sub-second utility outages without requiring larger capacitors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM8696ARWZ | Includes battery switchover (VOUT/VBATT) but lacks CEIN/CEOUT gating; pinout differs (VBATT/VOUT present, CEIN/CEOUT absent). | Used where RAM backup power switching is required instead of write protection. | Select ADM8696ARWZ only if VOUT-driven battery backup is needed; ADM8697ARWZ is not pin-compatible. |
| MAX697CPE+ | Fixed 140 ms watchdog timeout; no adjustable reset delay; CE gating not implemented; 16-pin DIP only. | Legacy drop-in for MAX697-based designs lacking fine-grained timing control. | Choose MAX697CPE+ only for direct replacement in existing DIP layouts; no CEOUT functionality available. |
Compared with ADM8696ARWZ and MAX697CPE+, the ADM8697ARWZ uniquely combines sub-7 ns CE gating, adjustable timing, and brownout write blocking - making it optimal for new designs requiring deterministic memory protection during supply transients.
Availability
ADM8697ARWZ is available at Aetrix Electronics and suitable for industrial control PLCs, automotive body controllers, medical infusion pumps, network edge routers, and critical µP power monitoring requiring stable component supply across extended temperature ranges.
Supply support for ADM8697ARWZ 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 ADM8697ARWZ belongs to the ADM869x supervisory family, designed specifically for robust power integrity in µP-based systems requiring coordinated reset, watchdog, and memory protection functions.
FAQ
What is the primary function of the ADM8697ARWZ in a microprocessor system?
The ADM8697ARWZ serves as a supervisory circuit that monitors VCC for brownout conditions, generates a timed RESET pulse, provides watchdog timer supervision, and gates chip-enable signals to prevent memory writes during undervoltage. Its core function is ensuring data integrity and deterministic µP behavior during power transients - confirmed by its CEOUT forcing high when LLIN falls below 1.3 V.
How does the ADM8697ARWZ protect CMOS RAM during power failure?
The ADM8697ARWZ protects CMOS RAM by driving CEOUT high whenever LLIN drops below 1.3 V, regardless of CEIN state. This blocks write operations to battery-backed RAM during brownout. In battery backup mode (VCC < VBATT − 0.2 V), CEIN is internally disconnected and CEOUT remains high - a behavior explicitly documented in Table II of the ADM8697 datasheet.
What are the valid operating voltage ranges for VCC and VBATT on the ADM8697ARWZ?
The ADM8697ARWZ supports VCC from 3.0 V to 5.5 V. VBATT is specified from 2.0 V to VCC − 0.3 V. Unlike the ADM8696, the ADM8697ARWZ does not use VBATT for power switching - VBATT is not connected in typical ADM8697 applications per the pin function table and Figure 18b schematic.
Can the reset timeout and watchdog timeout periods be configured independently on the ADM8697ARWZ?
Yes. The ADM8697ARWZ allows independent configuration using OSC SEL and OSC IN. With OSC SEL high, OSC IN selects between 100 ms and 1.6 s watchdog periods while reset delay remains fixed at 50 ms. With OSC SEL low, both reset delay and watchdog timeout scale proportionally with external capacitor or clock frequency - as detailed in Table I of the datasheet.
What is the propagation delay of the CE gating function in the ADM8697ARWZ?
The CE propagation delay of the ADM8697ARWZ is 2 ns at VCC = 5.0 V and 4 ns at VCC = 3.0 V, measured from CEIN transition to CEOUT response. This ultra-fast gating is critical for preventing spurious writes during rapid supply transients and is validated in the "CHIP ENABLE GATING" section of the datasheet specifications.
ADM8697ARWZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 1.3V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/Active Low
- Reset Timeout:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ADM8697ARWZ FAQ
1.How can I place an order for ADM8697ARWZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM8697ARWZ 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 ADM8697ARWZ reliable?
The price and inventory of ADM8697ARWZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM8697ARWZ is usually 5 days.
3.What payment methods are accepted for ADM8697ARWZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM8697ARWZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM8697ARWZ?
ADM8697ARWZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM8697ARWZ 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 ADM8697ARWZ?
For technical support, including ADM8697ARWZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM8697ARWZ requirements.
6.How does Aetrix verify that ADM8697ARWZ is sourced from the original manufacturer or authorized distributors?
All ADM8697ARWZ 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 ADM8697ARWZ meets industry standards.
7.What is the process for return or replacement of ADM8697ARWZ?
All ADM8697ARWZ units undergo pre-shipment inspection (PSI). If there is an issue with ADM8697ARWZ, 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 ADM8697ARWZ part is unused and in its original packaging.
Return procedure for ADM8697ARWZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADM8697ARWZ Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
