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Analog Devices Inc. ADM823SYRJZ-R7
- Part No.:
- ADM823SYRJZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM823SYRJZ-R7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:10,158
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Product details
Overview
ADM823SYRJZ-R7 from Analog Devices is a precision supervisory circuit with watchdog timer and manual reset, designed for microprocessor supply voltage monitoring in automotive-grade systems. It features a 2.93 V reset threshold (±50 mV over temperature), 140 ms minimum reset timeout, 1.6 sec watchdog timeout, push-pull active-low RESET output, and operates from VCC = 2.7 V to 3.6 V across −40°C to +125°C.
For engineers reviewing the ADM823SYRJZ-R7 datasheet, ADM823SYRJZ-R7 pinout, ADM823SYRJZ-R7 application, or ADM823SYRJZ-R7 equivalent, key selection criteria include guaranteed reset validity down to VCC = 1 V, internal 52 kΩ MR pull-up, 5 µA typical supply current, and SC70/SOT-23 package compatibility for space-constrained embedded control designs.
Technical Context
The ADM823SYRJZ-R7 integrates a precision voltage comparator with 40 ppm/°C temperature coefficient, a monostable watchdog timer cleared by WDI transitions ≥50 ns, and a debounced manual reset input with 1 µs minimum pulse width. Its reset generator asserts active-low RESET for ≥140 ms after VCC rises above 2.93 V or after MR deassertion.
Watchdog functionality requires periodic logic transitions on WDI to prevent timeout; failure triggers a full reset sequence. The device uses internal reference trimming and hysteresis (5 mV) to reject power supply glitches, and guarantees valid reset output even as VCC falls to 1 V - critical for brownout recovery in automotive ECUs and industrial controllers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V ±50 mV (2.85–3.00 V over −40°C to +125°C); ensures reliable detection of 3.3 V rail brownout. |
| Reset Timeout | 140–280 ms; provides sufficient hold time for microprocessor initialization after power stabilization. |
| Watchdog Timeout | 1.12–2.40 sec (typ. 1.6 sec); enables robust code execution monitoring without excessive false resets. |
| Supply Current | 5 µA typ. (VCC = 2.7–3.6 V); supports ultra-low-power operation in battery-backed or portable systems. |
| RESET Output Type | Active-low push-pull; sinks 1.2 mA at VCC = VTH min, eliminating need for external pull-down resistor. |
| MR Input Pull-Up | 52 kΩ internal; allows direct connection of momentary switch to GND without external components. |
| VCC Validity Range | Operates and asserts valid RESET down to VCC = 1 V; ensures deterministic behavior during deep brownout. |
Pinout & Package
ADM823SYRJZ-R7 is housed in a RoHS-compliant 5-lead SOT-23 (RJ-5) package, 2.90 mm × 1.60 mm × 1.15 mm, with gull-wing leads and JEDEC MO-178-AA compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserted when VCC < 2.93 V, MR low, or WDI timeout occurs. |
| 2 | GND | Ground reference for all internal circuitry and reset assertion logic. |
| 3 | MR | Active-low manual reset input; internally pulled up to VCC via 52 kΩ; 1 µs minimum pulse width required. |
| 4 | VCC | Monitored power supply input (2.7–3.6 V); powers internal circuitry and defines reset threshold scaling. |
| 5 | WDI | Watchdog input; reset cleared on any logic transition (≥50 ns); floating disables watchdog function. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive Temperature Range | Qualified for −40°C to +125°C operation; suitable for engine control units and ADAS domain controllers. |
| Power Supply Glitch Immunity | Rejects transients ≤100 ns; prevents spurious resets during EMI events or load switching noise. |
| Reset Validity at Low VCC | Guaranteed RESET assertion down to VCC = 1 V; enables fail-safe behavior during severe brownout. |
| Integrated MR Pull-Up | 52 kΩ internal resistor eliminates external component count for push-button reset implementation. |
| Low-Power Watchdog Enable | WDI can be left floating to disable watchdog; avoids unnecessary current draw in non-critical applications. |
Applications
| Engine Control Unit (ECU) | Industrial PLC CPU Module |
|---|---|
|
Use Scenario: Monitors 3.3 V microcontroller supply during cold cranking, where battery voltage dips below 6 V and rail collapses transiently. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout detection, and watchdog-triggered recovery for ARM Cortex-M7 core. Use Value: Prevents firmware lockup during voltage sag by asserting RESET until VCC stabilizes >2.93 V for ≥140 ms and clearing watchdog only on valid software strobes. |
Use Scenario: Ensures deterministic startup and runtime integrity of programmable logic controller main CPU under variable 24 V DC field power. IC Role / Device Role / Timing Role: Dual-function supervisor: generates clean reset pulse at power-up and detects firmware hangs via WDI polling loop. Use Value: Eliminates need for external RC reset network and discrete watchdog IC, reducing BOM count while maintaining IEC 61131-2 Class 2 immunity. |
| Automotive Body Control Module (BCM) | Medical Infusion Pump Controller |
|
Use Scenario: Manages reset sequencing for multi-rail system (3.3 V MCU, 5 V sensor interface, 1.8 V FPGA) with shared VCC monitoring point. IC Role / Device Role / Timing Role: Single-point voltage supervisor with manual reset override for service mode entry and watchdog fallback for safety-critical CAN communication stack. Use Value: Enables ASIL-B compliant reset architecture using one device instead of discrete comparators and timers, with validated 1.6 sec watchdog timeout per ISO 26262 Annex D. |
Use Scenario: Guarantees safe shutdown and restart of motor control MCU during AC/DC adapter dropout or battery swap in portable infusion devices. IC Role / Device Role / Timing Role: Fail-safe supervisor that asserts RESET on VCC drop below 2.93 V and forces hardware reset if motor driver firmware fails to toggle WDI every 1.6 sec. Use Value: Meets IEC 62304 Class C software safety requirements by providing hardware-enforced recovery path independent of application code state. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT29D3+T | Fixed 2.93 V threshold, no watchdog timer, open-drain RESET, 1.6 µA supply current. | Lacks watchdog capability; requires external pull-up and separate timer IC for code execution monitoring. | Select when watchdog is unnecessary and ultra-low quiescent current (<2 µA) is prioritized over functional integration. |
| TPS3808G33DBVR | 2.93 V threshold, no manual reset input, push-pull RESET, 16 µA supply current, 200 ms reset timeout. | Missing MR pin limits field-serviceability; higher current draw reduces battery life in portable use cases. | Choose for TI-based designs requiring compatible footprint and simplified sourcing, but verify absence of MR does not impact maintenance workflow. |
Compared with ADM823SYRJZ-R7, MAX6326UT29D3+T trades integrated watchdog and manual reset for lower power and simpler interface, while TPS3808G33DBVR offers TI ecosystem alignment but sacrifices MR flexibility and consumes >3× more current - making ADM823SYRJZ-R7 optimal for automotive and medical applications demanding full supervision features in minimal area.
Availability
ADM823SYRJZ-R7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC CPU modules, and medical infusion pump controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM823SYRJZ-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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA, with design centers worldwide and a legacy of precision power management innovation.
The ADM823 family was engineered specifically for automotive and industrial microprocessor supervision, delivering integrated voltage monitoring, watchdog timing, and manual reset in miniature SC70/SOT-23 packages with guaranteed operation to +125°C.
FAQ
What is the exact reset threshold voltage of ADM823SYRJZ-R7 and how does it vary with temperature?
The ADM823SYRJZ-R7 has a nominal reset threshold of 2.93 V at 25°C, with a guaranteed range of 2.85 V to 3.00 V across −40°C to +125°C. Its temperature coefficient is tightly controlled at 40 ppm/°C, meaning threshold drift is limited to ±12 mV over the full automotive temperature range - ensuring consistent brownout detection in engine bay or industrial cabinet environments where ambient temperature swings exceed 160°C.
Does ADM823SYRJZ-R7 require external components to implement manual reset functionality?
No, ADM823SYRJZ-R7 includes an internal 52 kΩ pull-up resistor on the MR pin, allowing direct connection of a momentary switch between MR and GND without external biasing. The device also integrates debounce circuitry and rejects glitches <100 ns, so no RC filter or Schmitt trigger is needed - simplifying PCB layout and reducing component count in space-constrained automotive and medical designs.
Can ADM823SYRJZ-R7 operate reliably when the monitored VCC rail drops below 2.0 V?
Yes, ADM823SYRJZ-R7 guarantees valid active-low RESET assertion down to VCC = 1 V, with output sinking capability maintained at ISINK = 50 µA even at this level. This ensures deterministic reset behavior during deep brownout conditions - such as automotive cold-crank events or medical device battery depletion - where other supervisors may release reset prematurely and cause undefined MCU states.
How is the watchdog timer in ADM823SYRJZ-R7 disabled if not required in the application?
The watchdog timer in ADM823SYRJZ-R7 is automatically disabled when the WDI pin is left unconnected (floating), thanks to an internal window comparator that isolates the timer from the reset generator. This eliminates the need for external pull-up/down resistors or configuration pins - enabling seamless migration between watchdog-enabled and watchdog-free firmware versions without hardware changes.
What package type and lead finish does ADM823SYRJZ-R7 use, and is it RoHS-compliant?
ADM823SYRJZ-R7 uses the 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with gull-wing leads and matte tin (Sn) lead finish. The "Z" suffix in the part number explicitly denotes RoHS compliance per EU Directive 2011/65/EU, including exemption 7a for lead in high-melting-temperature solder alloys - confirming suitability for automotive and medical manufacturing with full substance declaration traceability.
ADM823SYRJZ-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:
- 2.93V
- 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
ADM823SYRJZ-R7 FAQ
1.How can I place an order for ADM823SYRJZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM823SYRJZ-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 ADM823SYRJZ-R7 reliable?
The price and inventory of ADM823SYRJZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM823SYRJZ-R7 is usually 5 days.
3.What payment methods are accepted for ADM823SYRJZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM823SYRJZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM823SYRJZ-R7?
ADM823SYRJZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM823SYRJZ-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 ADM823SYRJZ-R7?
For technical support, including ADM823SYRJZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM823SYRJZ-R7 requirements.
6.How does Aetrix verify that ADM823SYRJZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADM823SYRJZ-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 ADM823SYRJZ-R7 meets industry standards.
7.What is the process for return or replacement of ADM823SYRJZ-R7?
All ADM823SYRJZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM823SYRJZ-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 ADM823SYRJZ-R7 part is unused and in its original packaging.
Return procedure for ADM823SYRJZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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