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Analog Devices Inc. ADM824LYRJZ-REEL7
- Part No.:
- ADM824LYRJZ-REEL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM824LYRJZ-REEL7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,775
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Product details
Overview
ADM824LYRJZ-REEL7 from Analog Devices is a supervisory circuit with integrated watchdog timer and dual push-pull reset outputs (active-low RESET and active-high RESET), designed for power supply monitoring and code execution integrity in microprocessor systems. It features a 4.63 V reset threshold, 140 ms minimum reset timeout, 1.6 sec typical watchdog timeout, guaranteed reset validity down to VCC = 1 V, and operates across −40°C to +125°C for automotive and industrial applications.
For engineers reviewing the ADM824LYRJZ-REEL7 datasheet, ADM824LYRJZ-REEL7 pinout, ADM824LYRJZ-REEL7 application, or ADM824LYRJZ-REEL7 equivalent, key selection criteria include reset threshold accuracy, watchdog timeout stability over temperature, dual-output drive capability, SC70/SOT-23 package compatibility, and low 5 µA quiescent current for portable and battery-backed systems.
Technical Context
The ADM824LYRJZ-REEL7 implements a precision voltage monitor with internal bandgap reference and hysteresis (10 mV), a monostable watchdog timer cleared by WDI transitions, and independent reset assertion logic triggered by VCC undervoltage, watchdog timeout, or (in other variants) manual reset - though ADM824 lacks MR input. Its dual push-pull outputs ensure fast, rail-to-rail logic levels without external pull-ups.
Reset propagation delay is 40 µs (VCC falling), and the device guarantees valid output states even as VCC drops to 1 V - enabling reliable brownout recovery. The watchdog input accepts 50 ns minimum pulses and exhibits glitch immunity up to 100 ns on MR (not applicable here) and transient rejection per Figure 12 in the datasheet.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V (typical), ±0.15 V over −40°C to +125°C - ensures stable reset assertion for 5 V systems with margin against ripple and drift. |
| Reset Timeout | 140 ms (min), 280 ms (max) - provides sufficient hold time for microprocessor initialization and clock stabilization. |
| Watchdog Timeout | 1.6 sec (typical), 1.12–2.40 sec range - balances fault detection latency and software servicing overhead in embedded firmware. |
| Supply Current | 5 µA (typical at VCC = 4.75–5.5 V) - enables use in always-on, low-power monitoring circuits without significant battery drain. |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive, industrial control, and extended-temperature embedded applications. |
| VCC Validity | Reset outputs guaranteed valid down to VCC = 1 V - supports robust operation during deep brownout and controlled power-down sequences. |
| Output Drive | Push-pull RESET and RESET - eliminates need for external pull resistors and ensures fast, low-impedance logic transitions. |
Pinout & Package
ADM824LYRJZ-REEL7 is packaged in a 5-lead SOT-23 (RJ-5) surface-mount package, 2.90 mm × 1.60 mm × 1.15 mm body size, JEDEC MO-178-AA compliant, with gull-wing leads and 0.95 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output - asserted when VCC < 4.63 V, watchdog times out, or (in other variants) MR is pulled low; not asserted by MR in ADM824. |
| 2 | GND | Ground reference for all internal comparators, timers, and output drivers - must be low-impedance connection to system ground plane. |
| 3 | RESET | Active-high push-pull reset output - complementary to Pin 1; both outputs are simultaneously asserted/deasserted for dual-signaling interfaces. |
| 4 | WDI | Watchdog input - requires logic transition (low→high or high→low) at least once per 1.6 sec to prevent reset; floating disables watchdog. |
| 5 | VCC | Monitored power supply input - supplies internal circuitry and serves as reference for reset threshold comparison; operates from 1.2 V to 5.5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Dual push-pull reset outputs | Simultaneous active-low and active-high signals eliminate external level-shifting or inverter logic in mixed-voltage systems. |
| Watchdog timer with 1.6 sec timeout | Enables firmware-level fault detection without dedicated timer peripherals - reduces MCU resource usage and BOM count. |
| Guaranteed reset validity to VCC = 1 V | Ensures deterministic reset behavior during uncontrolled power collapse, critical for data retention and safe state capture. |
| 7 selectable reset thresholds (4.63 V variant) | Supports precise matching to 5 V, 3.3 V, 2.5 V, and 1.8 V supply rails - this part targets 5 V nominal systems with 4.63 V trip point. |
| Power supply glitch immunity | Rejects transients ≤100 ns duration below threshold - prevents spurious resets from switching noise or ESD coupling on VCC. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitoring 5 V microcontroller supply in engine management systems exposed to load dump and cold-crank conditions. IC Role / Device Role / Timing Role: Supervisory circuit asserting dual-reset signals to ARM Cortex-M7 core upon undervoltage or software hang, with watchdog strobe synchronized to CAN message loop. Use Value: Prevents undefined MCU state during battery voltage sag; dual outputs interface directly with both processor reset pin and FPGA configuration controller. | Use Scenario: Power supervision of isolated 5 V logic rail powering analog input ADCs and digital isolators in modular I/O chassis. IC Role / Device Role / Timing Role: Voltage monitor and watchdog enforcer ensuring deterministic restart after field-induced firmware lockup or power interruption. Use Value: 140 ms reset pulse exceeds ADC conversion settling time; 5 µA quiescent current minimizes standby loss in distributed control nodes. |
| Medical Infusion Pump Controller | Ruggedized Handheld Test Instrument |
Use Scenario: Safety-critical reset management for ARM-based pump controller operating from Li-ion battery with buck-boost regulator. IC Role / Device Role / Timing Role: Dual-output supervisor providing redundant reset signaling to main MCU and safety monitor ASIC, with watchdog timeout aligned to motor control loop period. Use Value: −40°C to +125°C rating covers extended storage and operating ranges; VCC = 1 V validity ensures reset assertion through full battery discharge. | Use Scenario: Portable multimeter with real-time clock and flash memory requiring reliable power-up sequencing and crash recovery. IC Role / Device Role / Timing Role: Primary reset generator and watchdog supervisor for MSP430F5xx MCU, with WDI toggled during measurement acquisition cycles. Use Value: SOT-23 footprint saves PCB area in compact enclosure; 4.63 V threshold matches regulated 5 V rail tolerance stack-up for metrology-grade stability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT46D3+T | Single active-low open-drain reset output; no watchdog timer; 4.63 V threshold; 160 ms reset timeout. | Lacks dual outputs and watchdog - suitable only where external timing or reset inversion is acceptable and software hang detection is handled elsewhere. | Select when board space allows pull-up resistor and system design omits watchdog requirement. |
| TPS3808G33DBVR | Single active-low push-pull reset; adjustable watchdog (0.5–10 sec); 3.3 V fixed threshold; 200 ms reset timeout. | Threshold mismatch for 5 V systems; requires external resistor network to scale threshold - adds component count and calibration risk. | Choose only if redesigning for 3.3 V domain or adding programmable watchdog flexibility outweighs threshold inaccuracy. |
Compared with MAX6326UT46D3+T and TPS3808G33DBVR, ADM824LYRJZ-REEL7 uniquely delivers dual push-pull outputs and fixed 4.63 V/1.6 sec timing in a single SOT-23 package - eliminating external components and simplifying firmware integration for 5 V automotive and industrial controllers.
Availability
ADM824LYRJZ-REEL7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, and medical infusion pump controllers requiring stable component supply, AEC-Q100 alignment, and long-term lifecycle support.
Supply support for ADM824LYRJZ-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, Inc. is a global semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and automotive systems.
The ADM82x family was engineered specifically for microprocessor supervisory functions in harsh environments - delivering accurate voltage monitoring, watchdog protection, and dual-output flexibility in miniature packages for space-constrained, high-reliability applications.
FAQ
What is the reset threshold voltage of ADM824LYRJZ-REEL7 and how does it vary with temperature?
The ADM824LYRJZ-REEL7 has a nominal reset threshold of 4.63 V at 25°C, with a guaranteed range of 4.50 V to 4.75 V across −40°C to +125°C. Its temperature coefficient is 40 ppm/°C, resulting in ≤±12 mV drift over the full temperature range - sufficient for stable 5 V system supervision without calibration.
Does ADM824LYRJZ-REEL7 include a manual reset input (MR)?
No, ADM824LYRJZ-REEL7 does not include a manual reset input. Per Table 1 and Pin Function Descriptions in the datasheet, only ADM823 and ADM825 feature MR; ADM824 is defined by watchdog input (WDI) and dual reset outputs (RESET/RESET), with no MR pin or associated functionality.
What is the watchdog timeout behavior of ADM824LYRJZ-REEL7 and how is it cleared?
The ADM824LYRJZ-REEL7 watchdog timeout is 1.6 sec (typical), with a range of 1.12–2.40 sec. It is cleared by any logic transition (low-to-high or high-to-low) on the WDI pin. If WDI remains static beyond timeout, RESET and RESET are asserted. Leaving WDI floating disables the watchdog function entirely.
Can ADM824LYRJZ-REEL7 operate with supply voltages below 2.0 V?
Yes, ADM824LYRJZ-REEL7 guarantees valid reset output operation down to VCC = 1 V, though its specified operating range begins at 1.2 V (min) for full functionality. Below 1.2 V, reset assertion remains functional but timing parameters like propagation delay may deviate from datasheet limits.
What package type and dimensions does ADM824LYRJZ-REEL7 use?
ADM824LYRJZ-REEL7 uses a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, measuring 2.90 mm × 1.60 mm × 1.15 mm with 0.95 mm lead pitch. The "Z" suffix confirms RoHS compliance, and "REEL7" indicates 3,000-unit tape-and-reel packaging.
ADM824LYRJZ-REEL7 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:
- 4.63V
- Output:
- Push-Pull, Push-Pull
- Reset:
- Active High/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
ADM824LYRJZ-REEL7 FAQ
1.How can I place an order for ADM824LYRJZ-REEL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM824LYRJZ-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 ADM824LYRJZ-REEL7 reliable?
The price and inventory of ADM824LYRJZ-REEL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM824LYRJZ-REEL7 is usually 5 days.
3.What payment methods are accepted for ADM824LYRJZ-REEL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM824LYRJZ-REEL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM824LYRJZ-REEL7?
ADM824LYRJZ-REEL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM824LYRJZ-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 ADM824LYRJZ-REEL7?
For technical support, including ADM824LYRJZ-REEL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM824LYRJZ-REEL7 requirements.
6.How does Aetrix verify that ADM824LYRJZ-REEL7 is sourced from the original manufacturer or authorized distributors?
All ADM824LYRJZ-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 ADM824LYRJZ-REEL7 meets industry standards.
7.What is the process for return or replacement of ADM824LYRJZ-REEL7?
All ADM824LYRJZ-REEL7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM824LYRJZ-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 ADM824LYRJZ-REEL7 part is unused and in its original packaging.
Return procedure for ADM824LYRJZ-REEL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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