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Analog Devices Inc. ADM825SYRJZ-R7
- Part No.:
- ADM825SYRJZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
ADM825SYRJZ-R7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
ADM825SYRJZ-R7 from Analog Devices is a supervisory circuit with manual reset input and dual push-pull reset outputs, designed to monitor 2.93 V power rails in microprocessor systems. It provides 140 ms minimum reset 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 ADM825SYRJZ-R7 datasheet, ADM825SYRJZ-R7 pinout, ADM825SYRJZ-R7 application, or ADM825SYRJZ-R7 equivalent, key selection criteria include reset threshold accuracy (2.89 V to 2.96 V at 25°C), manual reset pulse width (≥1 µs), internal 52 kΩ MR pull-up, and SOT-23-5 package compatibility with space-constrained embedded designs.
Technical Context
The ADM825SYRJZ-R7 implements a precision voltage monitor with fixed 2.93 V reset threshold and 10 mV hysteresis, ensuring stable brownout detection during supply transients. Its dual push-pull RESET/RESET outputs drive active-low and active-high signals simultaneously without external components.
Unlike ADM823/ADM824, this variant omits watchdog functionality but integrates a debounced manual reset input (MR) with 500 ns MR-to-reset delay and 100 ns glitch rejection. The circuit guarantees valid reset assertion even as VCC falls to 1 V, supporting fail-safe operation in low-voltage microcontroller domains.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 2.93 V (typical at 25°C); tight 2.85–3.00 V range over −40°C to +125°C ensures reliable brownout detection on 3.0 V rails. |
| Reset Timeout | 140 ms (min); fixed duration guarantees sufficient processor initialization time after power stabilization. |
| Supply Current | 5 µA (typical); ultra-low quiescent draw enables use in battery-powered portable equipment. |
| Operating Voltage | 2.7 V to 3.6 V; supports 3.0 V nominal systems while maintaining reset validity down to VCC = 1 V. |
| MR Input Pull-Up | 52 kΩ (typical); eliminates need for external resistor, simplifying push-button reset implementation. |
| Reset Output Type | Dual push-pull (RESET active-low, RESET active-high); drives both logic polarities directly-no external inverters required. |
| Temperature Range | −40°C to +125°C; qualified for under-hood automotive and industrial control environments. |
Pinout & Package
ADM825SYRJZ-R7 is housed in a 5-lead SOT-23 (RJ-5) package per JEDEC MO-178-AA, with 0.95 mm lead pitch and 2.90 mm × 1.60 mm body dimensions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull output; asserts low when VCC < 2.93 V, MR pulled low, or during reset timeout period. |
| 2 | GND | Ground reference for all internal comparators and output drivers; must be connected to system ground plane. |
| 3 | RESET | Active-high push-pull output; complements pin 1-asserts high under identical reset conditions. |
| 4 | VCC | Monitored power supply input; supplies internal circuitry and defines reset threshold reference point. |
| 5 | MR | Manual reset input; active-low signal with integrated 52 kΩ pull-up; ≥1 µs pulse generates reset regardless of VCC level. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent reset outputs | Simultaneous active-low and active-high signals eliminate need for external level-shifting or inversion logic. |
| Guaranteed reset validity to VCC = 1 V | Ensures deterministic reset behavior during deep brownout or battery-depletion scenarios. |
| Integrated MR pull-up resistor | 52 kΩ internal pull-up removes requirement for discrete component, reducing BOM count and PCB area. |
| 100 ns MR glitch rejection | On-chip debounce rejects fast noise transients, preventing spurious resets from mechanical switch bounce. |
| Automotive temperature qualification | −40°C to +125°C operation meets AEC-Q100 stress test requirements for engine control and ADAS modules. |
Applications
| Microprocessor Power Monitoring | Automotive Engine Control Unit (ECU) |
|---|---|
Use Scenario: Continuous monitoring of 3.0 V supply rail powering an ARM Cortex-M7 MCU during vehicle ignition and runtime. IC Role / Device Role / Timing Role: Supervisory circuit asserting synchronized RESET/RESET signals to hold MCU in reset until supply stabilizes above 2.93 V. Use Value: Prevents illegal instruction execution during cold cranking when battery voltage dips to 2.8 V, eliminating firmware corruption risk. | Use Scenario: Reset coordination in a diesel ECU exposed to under-hood temperatures up to 125°C and load-dump transients. IC Role / Device Role / Timing Role: Dual-output reset generator providing fault-tolerant reset signaling to safety-critical ASIL-B microcontrollers. Use Value: Active-high and active-low outputs interface natively with diverse MCU reset architectures without level translation. |
| Industrial PLC I/O Module | Portable Medical Infusion Pump |
Use Scenario: Ensuring deterministic startup of a 32-bit RISC processor controlling analog I/O channels in factory automation hardware. IC Role / Device Role / Timing Role: Voltage supervisor with manual reset enabling field-service recovery via front-panel button press. Use Value: Integrated 52 kΩ MR pull-up reduces component count and improves long-term reliability versus discrete resistor solutions. | Use Scenario: Battery-backed microcontroller supervision in a Class II medical device operating from single-cell Li-ion (2.7–4.2 V). IC Role / Device Role / Timing Role: Low-power (5 µA) supervisory IC guaranteeing reset assertion during battery depletion to 2.7 V. Use Value: Valid reset outputs down to VCC = 1 V ensure safe shutdown before data loss or motor runaway occurs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM825TYRJZ-R7 | 3.08 V reset threshold (vs. 2.93 V); otherwise identical pinout, package, and feature set. | Suitable for 3.3 V systems requiring higher trip point; not drop-in for 3.0 V rails where 2.93 V margin is critical. | Select when system VCC nominal is 3.3 V and brownout tolerance requires >3.0 V detection. |
| MAX6326UT29D3+T | Single active-low reset output; 2.93 V threshold; 140 ms timeout; 1.6 µA supply current; SOT-23-5 package. | Lacks dual-output capability and manual reset input; optimized for ultra-low-power wearables rather than robust industrial reset control. | Choose only if dual outputs and MR are unnecessary and sub-2 µA quiescent current is mandatory. |
Compared with ADM825TYRJZ-R7, ADM825SYRJZ-R7 offers tighter alignment with 3.0 V rail brownout margins; versus MAX6326UT29D3+T, it delivers essential dual-output flexibility and manual reset for field-recoverable embedded systems-without increasing board area or BOM complexity.
Availability
ADM825SYRJZ-R7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM825SYRJZ-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 industrial, automotive, communications, and healthcare markets.
The ADM825 belongs to Analog Devices' precision supervisory circuit product line, engineered specifically for deterministic power-on reset, brownout protection, and manual recovery in safety-critical microprocessor systems.
FAQ
What is the exact reset threshold voltage of ADM825SYRJZ-R7 and how does it vary with temperature?
The ADM825SYRJZ-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 40 ppm/°C, resulting in ≤±12 mV drift over the full automotive temperature range-sufficient for stable 3.0 V rail monitoring without calibration.
Does ADM825SYRJZ-R7 include a watchdog timer function?
No, ADM825SYRJZ-R7 does not include a watchdog timer. Per the ADM823/ADM824/ADM825 selection table, only ADM823 and ADM824 variants integrate watchdog input (WDI). ADM825SYRJZ-R7 provides manual reset (MR) and dual push-pull reset outputs exclusively.
What is the purpose of the dual RESET and RESET outputs on ADM825SYRJZ-R7?
The dual outputs provide active-low (RESET) and active-high (RESET) reset signals simultaneously. This allows direct interfacing with MCUs requiring either polarity-eliminating external inverters or level shifters-and supports redundancy schemes where both signals feed separate safety monitors in ASIL-B/C systems.
Can ADM825SYRJZ-R7 operate reliably below 2.7 V supply voltage?
ADM825SYRJZ-R7 is specified for 2.7 V to 3.6 V operation, but its reset outputs remain valid down to VCC = 1 V. While functional monitoring ceases below 2.7 V, the guaranteed low-VCC reset behavior ensures safe shutdown sequencing during battery depletion or severe brownout events.
Is an external pull-up resistor required on the MR pin of ADM825SYRJZ-R7?
No external pull-up is required. ADM825SYRJZ-R7 integrates a 52 kΩ internal pull-up on the MR pin, holding it high when unconnected. This simplifies push-button reset design-only a momentary switch between MR and GND is needed, with no additional passive components.
ADM825SYRJZ-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, 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
ADM825SYRJZ-R7 FAQ
1.How can I place an order for ADM825SYRJZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM825SYRJZ-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 ADM825SYRJZ-R7 reliable?
The price and inventory of ADM825SYRJZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM825SYRJZ-R7 is usually 5 days.
3.What payment methods are accepted for ADM825SYRJZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM825SYRJZ-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM825SYRJZ-R7?
ADM825SYRJZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM825SYRJZ-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 ADM825SYRJZ-R7?
For technical support, including ADM825SYRJZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM825SYRJZ-R7 requirements.
6.How does Aetrix verify that ADM825SYRJZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADM825SYRJZ-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 ADM825SYRJZ-R7 meets industry standards.
7.What is the process for return or replacement of ADM825SYRJZ-R7?
All ADM825SYRJZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM825SYRJZ-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 ADM825SYRJZ-R7 part is unused and in its original packaging.
Return procedure for ADM825SYRJZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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