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Analog Devices Inc. ADM691ARZ-REEL7
- Part No.:
- ADM691ARZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 16-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADM691ARZ-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,764
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Product details
Overview
ADM691ARZ-REEL7 from Analog Devices is a microprocessor supervisory circuit integrating power-on reset, battery backup switchover, watchdog timer, chip enable gating, and power-fail detection. It features a 4.65 V ±3% reset threshold, 200 ms fixed reset timeout (adjustable), 1.6 s/100 ms selectable watchdog timeout, and supports VCC down to 1 V operation. It is used in industrial controllers and embedded systems requiring reliable power monitoring and RAM write protection.
For engineers reviewing the ADM691ARZ-REEL7 datasheet, ADM691ARZ-REEL7 pinout, ADM691ARZ-REEL7 application, or ADM691ARZ-REEL7 equivalent, key selection criteria include reset voltage accuracy, battery switchover hysteresis (60 mV), VCC-to-VOUT on-resistance (0.8–1.2 Ω), WDI input transition sensitivity, and compatibility with 5 V ±5% supplies.
Technical Context
The ADM691ARZ-REEL7 implements a dual-threshold voltage detector (4.65 V nominal with 15 mV hysteresis) and an internal oscillator-based timing engine for both reset generation and watchdog supervision. Its battery switchover uses PMOS (VCC→VOUT) and NMOS (VBATT→VOUT) switches with validated on-resistances of 0.8–1.2 Ω and 12–25 Ω respectively.
Chip enable gating provides 6–10 ns propagation delay between CEIN and CEOUT, with CEOUT forced high during reset assertion. The PFI comparator uses a precision 1.25 V reference and delivers 25 µs response to input transients, enabling early power-fail warning before VCC crosses the reset threshold.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.65 V ±3% - matches 5 V ±5% supply tolerance; ensures reset assertion before logic corruption. |
| Reset Timeout | 200 ms typ - holds µP in reset long enough for power and clock stabilization after power-up. |
| Watchdog Timeout | 1.6 s long / 100 ms short - configurable via OSC SEL/OSC IN; first timeout post-reset is always 1.6 s. |
| VCC-to-VOUT RON | 0.8–1.2 Ω - enables ≤250 mA continuous output with <60 mV dropout at 25 mA load. |
| Battery Switchover Hysteresis | 60 mV - prevents oscillation during VCC/VBATT crossover near switchover point. |
| PFI Threshold | 1.25 V ±25 mV - allows precise early-warning detection of main supply droop via external divider. |
| Supply Current (Active) | 70–100 µA - enables low-power operation in always-on supervisory roles. |
| Standby Current (Battery) | 0.04–1 µA - extends backup runtime for CMOS RAM during extended VCC loss. |
Pinout & Package
ADM691ARZ-REEL7 is packaged in a 16-lead narrow-body SOIC (R-16N), RoHS-compliant, tape-and-reel format. Pin assignments are fully defined per Analog Devices' official pin descriptions and functional block diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VBATT | Backup battery input | Connects to 2.0–6 V backup source; enables automatic switchover when VCC drops below VBATT − 0.03 V. |
| 2 VOUT | Switched output rail | Delivers VCC or VBATT (whichever is higher and valid); powers RAM or low-power logic up to 250 mA. |
| 3 VCC | Main +5 V supply input | Operates from 4.75–5.5 V; supervisory functions remain active down to 1 V. |
| 4 GND | Ground reference | Common return for all analog/digital circuits; required for accurate threshold detection. |
| 5 BATT ON | Battery status indicator | Open-drain output pulled high when VBATT powers VOUT; drives external PNP base for >250 mA loads. |
| 6 LOW LINE | VCC undervoltage flag | Active-low signal asserted when VCC falls below 4.65 V; used for system-level brownout alerts. |
| 7 OSC IN | Oscillator control input | Selects reset/watchdog timing: grounded = 100 ms WD, floating = 1.6 s WD, capacitor-driven = adjustable. |
| 8 OSC SEL | Oscillator mode select | High/floating = internal oscillator; low = external clock or capacitor timing source. |
| 9 PFI | Power fail input | Non-inverting comparator input referenced to 1.25 V; triggers PFO when voltage drops below 1.25 V. |
| 10 PFO | Power fail output | Active-low interrupt signal for µP NMI; enables data save before full power loss. |
| 11 WDI | Watchdog input | Three-level input (low/mid/high); reset triggered if no transition occurs within timeout period. |
| 12 CEOUT | Gated chip enable output | Follows CEIN when VCC is valid; forced high during reset to prevent RAM writes during brownout. |
| 13 CEIN | Chip enable input | Directly controls CEOUT; tied to GND or VOUT if unused. |
| 14 WDO | Watchdog status output | Active-low flag indicating WD timeout; resets high on next WDI transition. |
| 15 RESET | Active-low reset output | Drives µP reset pin; guaranteed low until 200 ms after VCC rises above 4.65 V. |
| 16 RESET | Active-high reset output | Complementary open-drain output; useful for processors requiring active-high reset assertion. |
Key Features
| Feature | Design Value |
|---|---|
| Adjustable reset & watchdog timing | Supports external capacitor (COSC) or clock source for custom timeout periods - Treset = 1200×(C/47 pF), TWD = 600×(C/47 pF). |
| Low-dropout battery switchover | VCC→VOUT RON = 0.8 Ω typ; VBATT→VOUT RON = 12 Ω typ at 2.8 V - minimizes voltage loss during backup mode. |
| RAM write protection logic | CEOUT forced high during reset or low-VCC events - prevents corrupted writes to battery-backed CMOS RAM. |
| Early power-fail warning | 1.25 V PFI comparator with 25 µs response - enables µP to execute shutdown routines before VCC crosses 4.65 V. |
| Ultra-low battery standby current | 0.04 µA typ - extends multi-year backup life for SRAM in industrial logging or metering applications. |
| Wide VCC operating range | Functional down to VCC = 1 V - ensures controlled shutdown even during deep brownouts. |
Applications
| Industrial Controller Monitoring | Automotive Body Control Module |
|---|---|
|
Use Scenario: Continuous monitoring of 5 V supply in programmable logic controller (PLC) backplane with battery-backed configuration RAM. IC Role / Device Role / Timing Role: Supervisory IC providing reset hold-off, watchdog supervision, and CE gating to protect RAM during line transients. Use Value: Prevents firmware corruption during 10–100 ms AC line dips by holding RESET low until VCC stabilizes ≥200 ms post-recovery. |
Use Scenario: Power management in automotive BCM where ECU must retain calibration data during ignition cycling and battery voltage sag. IC Role / Device Role / Timing Role: Battery switchover controller and watchdog supervisor ensuring safe state retention during cranking (VCC = 6–9 V → 4.2 V). Use Value: 60 mV switchover hysteresis eliminates chatter during VCC/VBATT crossover; 0.04 µA battery drain preserves coin-cell life >5 years. |
| Medical Infusion Pump Safety System | Telecom Remote Terminal Unit |
|
Use Scenario: Critical safety-critical reset and memory protection in battery-powered infusion pump with nonvolatile parameter storage. IC Role / Device Role / Timing Role: Dual-role supervisor: generates hardware reset on power anomaly and disables RAM writes via CEOUT during brownout. Use Value: Guarantees RAM integrity under IEC 60601-1 specified 100 ms interruption; RESET remains asserted down to VCC = 1 V. |
Use Scenario: Outdoor RTU powered by solar-charged Li-ion with intermittent grid backup; requires robust power sequencing and fault logging. IC Role / Device Role / Timing Role: Power-fail detector (PFI/PFO) triggers NMI to log last valid sensor readings before shutdown. Use Value: 1.25 V PFI threshold enables precise trip point setting (e.g., 7.2 V input → 1.25 V) with 25 µs latency - captures final state pre-failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX691ACPE+ | Same pinout, 4.65 V reset threshold, but higher 150 µA supply current and no adjustable watchdog timeout. | Lacks OSC SEL/OSC IN flexibility; fixed 1.6 s watchdog only - unsuitable for designs needing 100 ms timeout. | Choose MAX691ACPE+ only if legacy drop-in replacement is required and adjustable timing is unnecessary. |
| TPS3823MPW | Lower 50 µA quiescent current, 4.63 V reset threshold, but no battery switchover or CE gating functionality. | Cannot replace ADM691ARZ-REEL7 in RAM backup or chip-enable protection roles - requires external circuitry. | Select TPS3823MPW only for basic reset-only applications where battery backup and CE control are handled separately. |
Compared with MAX691ACPE+, ADM691ARZ-REEL7 offers lower active current and flexible timing; compared with TPS3823MPW, it integrates battery switchover and CE gating - eliminating 3–4 discrete components in RAM-backed systems.
Availability
ADM691ARZ-REEL7 is available at Aetrix Electronics and suitable for industrial controllers, automotive body electronics, medical infusion pumps, and telecom remote terminal units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM691ARZ-REEL7 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 ADM691A family was designed specifically for microprocessor system supervision - integrating reset, watchdog, battery switchover, CE gating, and power-fail detection into a single 16-pin IC to reduce board space and improve reliability in mission-critical embedded systems.
FAQ
What is the reset voltage threshold of the ADM691ARZ-REEL7?
The ADM691ARZ-REEL7 has a nominal reset voltage threshold of 4.65 V with ±3% tolerance (4.50 V to 4.75 V). This threshold is guaranteed over the full industrial temperature range (–40°C to +85°C) and ensures compatibility with standard 5 V ±5% power supplies. The device asserts RESET low when VCC falls below this threshold and holds it low for 200 ms after VCC rises above it.
Can the ADM691ARZ-REEL7 support adjustable watchdog timeout periods?
Yes, the ADM691ARZ-REEL7 supports adjustable watchdog timeout periods via the OSC SEL and OSC IN pins. With OSC SEL grounded, connecting a capacitor (C) from OSC IN to GND sets the timeout to 600 × (C/47 pF) milliseconds. Alternatively, applying an external clock to OSC IN yields TWD = 1024 × (1/fCLK). The ADM691ARZ-REEL7 also supports fixed 100 ms and 1.6 s modes without external components.
How does the ADM691ARZ-REEL7 handle battery backup switchover?
The ADM691ARZ-REEL7 automatically switches VOUT between VCC and VBATT based on relative voltage and validity. When VCC > VBATT + 0.03 V and above reset threshold, VCC powers VOUT via a 0.8–1.2 Ω PMOS switch. When VCC drops below VBATT − 0.03 V, VBATT powers VOUT via a 12–25 Ω NMOS switch. Switchover hysteresis is 60 mV to prevent oscillation, and battery standby current is as low as 0.04 µA.
What is the function of the CEIN and CEOUT pins on the ADM691ARZ-REEL7?
The CEIN and CEOUT pins implement chip-enable gating for RAM write protection. CEOUT is a buffered replica of CEIN when VCC is valid (>4.65 V), with 6–10 ns propagation delay. During reset or brownout (VCC < 4.65 V), CEOUT is forced high regardless of CEIN state - preventing spurious writes to battery-backed CMOS RAM. This ensures data integrity during power transitions.
Does the ADM691ARZ-REEL7 provide power-fail warning capability?
Yes, the ADM691ARZ-REEL7 includes a dedicated power-fail comparator with PFI and PFO pins. The PFI input compares against an internal 1.25 V reference; when PFI voltage falls below 1.25 V, PFO goes low within 25 µs. This allows designers to configure early warning (e.g., at 7 V input) using an external resistor divider, giving the microprocessor time to save critical data before VCC crosses the 4.65 V reset threshold.
ADM691ARZ-REEL7 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:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
ADM691ARZ-REEL7 FAQ
1.How can I place an order for ADM691ARZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM691ARZ-REEL7 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 ADM691ARZ-REEL7 reliable?
The price and inventory of ADM691ARZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM691ARZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM691ARZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM691ARZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM691ARZ-REEL7?
ADM691ARZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM691ARZ-REEL7 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 ADM691ARZ-REEL7?
For technical support, including ADM691ARZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM691ARZ-REEL7 requirements.
6.How does Aetrix verify that ADM691ARZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM691ARZ-REEL7 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 ADM691ARZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM691ARZ-REEL7?
All ADM691ARZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM691ARZ-REEL7, 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 ADM691ARZ-REEL7 part is unused and in its original packaging.
Return procedure for ADM691ARZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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