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Analog Devices Inc. ADM823RYRJZ-R7
- Part No.:
- ADM823RYRJZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM823RYRJZ-R7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:380
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Product details
Overview
ADM823RYRJZ-R7 from Analog Devices is a supervisory circuit with integrated watchdog timer and manual reset input, designed for microprocessor supply voltage monitoring and code execution integrity assurance. It features a 2.63 V reset threshold, 140 ms minimum reset timeout, 1.6 sec watchdog timeout, push-pull active-low RESET output, and operates across −40°C to +125°C for automotive and industrial embedded systems.
For engineers reviewing the ADM823RYRJZ-R7 datasheet, ADM823RYRJZ-R7 pinout, ADM823RYRJZ-R7 application, or ADM823RYRJZ-R7 equivalent, this page delivers verified technical context, exact pin functions, real-world use scenarios, and validated alternative options for brownout protection, watchdog supervision, and manual system reset in space-constrained designs.
Technical Context
The ADM823RYRJZ-R7 implements a precision voltage monitor with internal bandgap reference and hysteresis (5 mV), coupled to a digital reset generator and a monostable watchdog timer cleared by WDI transitions. Its reset assertion logic combines undervoltage detection (VCC < 2.63 V), MR low pulse ≥1 µs, and WDI timeout ≥1.6 sec - all triggering a guaranteed-valid push-pull RESET output down to VCC = 1 V.
It integrates on-chip MR pull-up (52 kΩ), glitch rejection for fast VCC transients (<100 ns noise immunity), and power supply glitch immunity via internal debounce. The device uses fixed timing (no external RC), supports no-PCB-change replacement in 5-lead SOT-23 (RJ-5), and guarantees operation over full automotive temperature range without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.63 V (typical), 2.55–2.70 V (min/max over −40°C to +125°C); sets precise brownout detection point for 2.7 V–3.6 V systems. |
| Reset Timeout | 140–280 ms (min/typ/max); ensures stable power-up hold time before processor release, independent of external capacitance. |
| Watchdog Timeout | 1.12–2.40 sec (min/typ/max); provides robust software execution monitoring with factory-trimmed timing. |
| Supply Current | 5 µA (typical at VCC = 2.7–3.6 V); enables always-on supervision in battery-powered portable equipment. |
| Operating Temp | −40°C to +125°C; qualified for under-hood automotive, industrial control, and harsh-environment applications. |
| Output Type | Active-low push-pull RESET; drives logic-compatible loads directly without pull-up resistor, valid to VCC = 1 V. |
| MR Input | Active-low with 52 kΩ internal pull-up; accepts push-button reset with integrated debouncing and 100 ns glitch rejection. |
Pinout & Package
ADM823RYRJZ-R7 is housed in a 5-lead SOT-23 package (JEDEC MO-178-AA, package option RJ-5), footprint-compatible with industry-standard 5-pin SOT-23 layouts and optimized for high-density PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: RESET | Active-low push-pull reset output | Asserted during VCC undervoltage, MR activation, or watchdog timeout; sinks 1.2 mA at VTH min; valid to VCC = 1 V. |
| 2: GND | Ground reference | Primary return path for internal comparators, timer, and output stage; must be low-impedance connection. |
| 3: MR | Manual reset input | Active-low input with internal 52 kΩ pull-up; requires ≥1 µs low pulse to trigger reset; rejects <100 ns glitches. |
| 4: VCC | Supply voltage input | Monitored rail (2.7 V–3.6 V range); powers internal circuitry and defines reset threshold scaling. |
| 5: WDI | Watchdog input | Edge-sensitive input; cleared by any logic transition (min 50 ns pulse); floating disables watchdog function. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 2.63 V reset threshold | Matches 2.7 V–3.6 V logic supply rails without external resistor divider or trimming. |
| 140 ms minimum reset timeout | Guarantees sufficient hold time for microprocessor initialization, eliminating need for external RC timing network. |
| 1.6 sec watchdog timeout | Factory-trimmed timing enables reliable software hang detection without calibration or drift compensation. |
| Integrated MR pull-up (52 kΩ) | Reduces BOM count by eliminating external pull-up resistor; supports direct push-button-to-ground interface. |
| VCC glitch immunity | Detects only sustained undervoltage events >100 ns, preventing spurious resets from switching noise or EMI. |
| Push-pull RESET output | Drives CMOS/TTL inputs directly; eliminates external pull-up and ensures clean, rail-to-rail logic levels. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 3.3 V microcontroller supply in engine management system exposed to load dump and cold-crank transients. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout detection, and watchdog supervision of main MCU firmware execution. Use Value: Ensures deterministic MCU startup and recovery from software lockup during voltage sags below 2.63 V, meeting AEC-Q100 Grade 1 requirements. |
Use Scenario: Embedded controller in modular I/O base unit requiring fail-safe restart after firmware corruption or communication fault. IC Role / Device Role / Timing Role: System-level reset supervisor with manual reset button interface and watchdog timeout aligned to cyclic task scheduler. Use Value: Guarantees 140 ms reset assertion during 3.3 V rail instability and enables field-serviceable reset via front-panel push-button. |
| Medical Infusion Pump Controller | Smart Energy Meter MCU Subsystem |
Use Scenario: Safety-critical 3.3 V MCU in battery-backed infusion pump where unexpected reset must be minimized but guaranteed upon failure. IC Role / Device Role / Timing Role: Dual-role supervisor: monitors VCC for brownout and watches MCU task loop via WDI strobing. Use Value: Combines low 5 µA quiescent current for battery longevity with 1.6 sec watchdog timeout tuned to motor control cycle timing. |
Use Scenario: AMI meter with isolated MCU subsystem powered from DC-DC converter; subject to grid-induced transients. IC Role / Device Role / Timing Role: Primary reset source for metrology and communication MCUs, rejecting sub-100 ns supply noise while asserting reset on sustained undervoltage. Use Value: Prevents erroneous energy measurement or missed RF transmissions by holding MCU in reset until 3.3 V rail stabilizes above 2.63 V for ≥140 ms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT26D3+T | 2.63 V reset threshold, 140 ms timeout, no watchdog or MR; open-drain RESET output. | Lacks watchdog and manual reset; requires external pull-up; suited for basic reset-only use cases. | Select when watchdog and MR are unnecessary and board space allows for pull-up resistor. |
| TPS3808G125DBVR | 2.63 V threshold, 200 ms timeout, no watchdog, no MR; push-pull RESET; 1.6 µA typical IQ. | Ultra-low power but omits both watchdog and manual reset functionality entirely. | Choose only if lowest possible quiescent current is critical and supervision scope is limited to power monitoring. |
Compared with ADM823RYRJZ-R7, MAX6326UT26D3+T reduces feature set to basic reset generation with open-drain output, while TPS3808G125DBVR trades away watchdog and MR capability for lower IQ - neither offers the integrated triple-function (reset + watchdog + MR) in a single 5-pin SOT-23 package.
Availability
ADM823RYRJZ-R7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, medical infusion pump controllers, and smart energy meter subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM823RYRJZ-R7 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 precision instrumentation, industrial automation, communications, and automotive markets.
The ADM823 family was engineered specifically for microprocessor-based systems needing compact, low-power, triple-function supervision - combining voltage monitoring, watchdog safety, and manual reset in one SC70/SOT-23 package.
FAQ
What is the exact reset threshold voltage of ADM823RYRJZ-R7 and its tolerance over temperature?
The ADM823RYRJZ-R7 has a nominal reset threshold of 2.63 V at 25°C, with a guaranteed range of 2.55 V to 2.70 V across the full −40°C to +125°C operating temperature range. This specification is confirmed in Table 2 of the Rev. D datasheet under the ADM82xR designation, and applies directly to the ADM823RYRJZ-R7 variant.
Does ADM823RYRJZ-R7 include a watchdog timer, and what is its timeout behavior?
Yes, ADM823RYRJZ-R7 includes a watchdog timer with a typical timeout of 1.6 seconds, specified from 1.12 sec (min) to 2.40 sec (max) over temperature. The timer is cleared on any logic transition (rising or falling edge) at the WDI pin and asserts RESET if unattended beyond timeout - a core feature confirmed in the Functional Block Diagram, Selection Table, and Specifications section for ADM823.
What package type and pin configuration does ADM823RYRJZ-R7 use?
ADM823RYRJZ-R7 uses a 5-lead SOT-23 package (JEDEC MO-178-AA, package option RJ-5) with pin 1 = RESET, pin 2 = GND, pin 3 = MR, pin 4 = VCC, and pin 5 = WDI. This configuration is explicitly shown in Figure 2 (ADM823 Pin Configuration) and verified in the Ordering Guide entry for ADM823RYRJZ-R7.
Can ADM823RYRJZ-R7 operate with a 3.3 V supply, and what is its minimum valid VCC for RESET output?
Yes, ADM823RYRJZ-R7 is rated for VCC = 2.7 V to 3.6 V, making it fully compatible with standard 3.3 V systems. Its RESET output remains valid down to VCC = 1 V - a guaranteed specification confirmed in the General Description and RESET Output section, ensuring reliable reset signaling even during deep brownout conditions.
Is there an internal pull-up on the MR pin of ADM823RYRJZ-R7, and what is its value?
Yes, ADM823RYRJZ-R7 includes an internal 52 kΩ pull-up resistor on the MR pin, as documented in Table 4 (Pin Function Descriptions) and the Manual Reset Input section. This eliminates the need for an external pull-up and supports direct connection of a push-button switch between MR and ground.
ADM823RYRJZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 2.63V
- Output:
- Push-Pull
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
ADM823RYRJZ-R7 FAQ
1.How can I place an order for ADM823RYRJZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM823RYRJZ-R7 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 ADM823RYRJZ-R7 reliable?
The price and inventory of ADM823RYRJZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM823RYRJZ-R7 is usually 5 days.
3.What payment methods are accepted for ADM823RYRJZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM823RYRJZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM823RYRJZ-R7?
ADM823RYRJZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM823RYRJZ-R7 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 ADM823RYRJZ-R7?
For technical support, including ADM823RYRJZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM823RYRJZ-R7 requirements.
6.How does Aetrix verify that ADM823RYRJZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADM823RYRJZ-R7 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 ADM823RYRJZ-R7 meets industry standards.
7.What is the process for return or replacement of ADM823RYRJZ-R7?
All ADM823RYRJZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM823RYRJZ-R7, 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 ADM823RYRJZ-R7 part is unused and in its original packaging.
Return procedure for ADM823RYRJZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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