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Analog Devices Inc. ADM825TYKSZ-R7
- Part No.:
- ADM825TYKSZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
ADM825TYKSZ-R7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,409
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Product details
Overview
ADM825TYKSZ-R7 from Analog Devices is a supervisory circuit with manual reset input and dual push-pull reset outputs, designed for microprocessor supply voltage monitoring in automotive-grade systems. It features a 3.08 V reset threshold (±0.05 V over temperature), 140 ms minimum reset timeout, guaranteed reset validity down to VCC = 1 V, and operates across −40°C to +125°C. It is used in engine control units to ensure reliable power-on initialization and brownout recovery.
For engineers reviewing the ADM825TYKSZ-R7 datasheet, ADM825TYKSZ-R7 pinout, ADM825TYKSZ-R7 application, or ADM825TYKSZ-R7 equivalent, key selection criteria include reset threshold accuracy, manual reset timing behavior, dual active-low/active-high output drive capability, low 5 µA quiescent current, and SC70-5 package compatibility with space-constrained automotive PCB layouts.
Technical Context
The ADM825TYKSZ-R7 implements a precision bandgap-based reset comparator with 10 mV hysteresis and 40 ppm/°C temperature coefficient, ensuring stable threshold performance across the full automotive temperature range. Its dual push-pull outputs (RESET and RESET) provide simultaneous active-low and active-high reset signaling without external pull resistors.
It integrates an internal 52 kΩ MR pull-up resistor and debounces MR pulses ≥1 µs, enabling direct connection to a momentary switch. Unlike ADM823/ADM824, it excludes watchdog functionality-its circuit role is strictly voltage supervision and manual reset assertion, not code execution integrity monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V (typ), 3.00–3.15 V (min/max over −40°C to +125°C); enables reliable detection of 3.3 V rail brownout. |
| Reset Timeout | 140–280 ms (min/typ/max); ensures sufficient hold time for microprocessor core and peripheral stabilization after power rise. |
| Supply Current | 5 µA (typ) at VCC = 3.0–3.6 V; supports always-on monitoring in battery-backed automotive modules. |
| Output Type | Dual push-pull: RESET (active low), RESET (active high); eliminates need for external pull-up/down resistors. |
| VCC Validity Range | Reset outputs guaranteed valid down to VCC = 1 V; maintains deterministic state during deep undervoltage conditions. |
| MR Input Threshold | 0.3 × VCC to 0.7 × VCC; compatible with standard CMOS logic levels across full VCC operating range. |
| MR Pulse Width | ≥1 µs minimum; rejects noise spikes while supporting mechanical switch actuation. |
Pinout & Package
ADM825TYKSZ-R7 is housed in a 5-lead SC70 (KS-5) package, measuring 2.00 mm × 1.25 mm × 0.90 mm, with gull-wing leads and JEDEC MO-203-AA compliance. The package supports reflow soldering and provides thermal impedance of 146°C/W (θJA).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; asserts low when VCC < 3.08 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 reset output; complements Pin 1 for systems requiring both polarity signals simultaneously. |
| 4 | VCC | Monitored power supply input (2.7 V to 3.6 V); powers internal circuitry and defines MR/RESET thresholds. |
| 5 | MR | Manual reset input (active low); internally pulled up to VCC via 52 kΩ; triggers reset on ≥1 µs low pulse. |
Key Features
| Feature | Design Value |
|---|---|
| Dual push-pull reset outputs | Eliminates external pull resistors and reduces BOM count in dual-polarity reset architectures. |
| Automotive temperature range | −40°C to +125°C operation validated per AEC-Q100 stress test requirements for under-hood applications. |
| Internal MR pull-up | 52 kΩ resistor ensures defined high state when MR is unconnected, preventing spurious resets. |
| Low 5 µA supply current | Enables continuous supervision in always-on domains such as CAN wake-up controllers without draining backup batteries. |
| Reset validity to 1 V | Guarantees deterministic output states during severe brownout, improving system predictability in fault conditions. |
Applications
| Engine Control Unit (ECU) | Advanced Driver Assistance System (ADAS) Camera Module |
|---|---|
Use Scenario: Monitors 3.3 V microcontroller supply during cold cranking, where battery voltage dips below 9 V causing rail sag. IC Role / Device Role / Timing Role: Supervisory circuit asserting synchronized active-low and active-high reset to initialize MCU, CAN transceiver, and ADC subsystems. Use Value: Prevents erratic MCU boot by holding reset until 3.3 V rail stabilizes above 3.08 V for ≥140 ms, eliminating firmware lockup on power recovery. |
Use Scenario: Ensures clean startup of image signal processor and serializer in automotive camera after ignition-on power ramp. IC Role / Device Role / Timing Role: Voltage supervisor providing dual-polarity reset to coordinate timing between ISP, MIPI interface, and power management IC. Use Value: Dual push-pull outputs eliminate level-shifting delays, enabling sub-millisecond synchronization of reset release across heterogeneous SoC peripherals. |
| Infotainment Head Unit | Electric Power Steering (EPS) Controller |
Use Scenario: Maintains safe state during accessory-mode power cycling, where 3.3 V rail may experience transient dropout. IC Role / Device Role / Timing Role: Manual reset supervisor allowing service technicians to force controlled reboot via front-panel button without disconnecting power. Use Value: Integrated 52 kΩ MR pull-up and 1 µs debounce enable direct switch connection-no external RC network required. |
Use Scenario: Detects undervoltage on safety-critical 3.3 V domain powering torque sensor interface and motor gate driver logic. IC Role / Device Role / Timing Role: Fail-safe monitor asserting reset to ASIL-B compliant MCU upon sustained drop below 3.08 V. Use Value: 40 ppm/°C threshold drift ensures ±15 mV accuracy over −40°C to +125°C, meeting ISO 26262 functional safety margin requirements. |
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 | SOT-23-5 package (RJ-5), same 3.08 V threshold and −40°C to +125°C rating; 2.90 mm × 1.60 mm footprint vs. SC70's 2.00 mm × 1.25 mm. | Preferred where board assembly uses standard SOT-23 pick-and-place tooling or requires higher thermal mass. | Select when PCB layout prioritizes manufacturability over minimal area; identical electrical specs and pinout. |
| MAX6326UT31D3+T | 3.08 V reset threshold, but single active-low open-drain output; no active-high output or internal MR pull-up; 1.6 µA typical supply current. | Suitable for cost-sensitive non-automotive designs where dual outputs and MR pull-up are unnecessary. | Choose only if dual reset polarity and integrated MR bias are not required; not drop-in due to output architecture and pin function mismatch. |
Compared with ADM825TYKSZ-R7, ADM825TYRJZ-R7 offers identical supervision functionality in a larger, more thermally robust package, while MAX6326UT31D3+T reduces feature set and current draw but sacrifices dual-output flexibility and automotive qualification-making ADM825TYKSZ-R7 optimal for space-constrained, safety-critical automotive nodes requiring deterministic dual-polarity reset signaling.
Availability
ADM825TYKSZ-R7 is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, infotainment head units, and electric power steering controllers requiring stable component supply with automotive-grade reliability and traceable sourcing.
Supply support for ADM825TYKSZ-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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision instrumentation, industrial automation, and automotive systems.
The ADM825 is part of Analog Devices' automotive-qualified supervisory IC family, engineered specifically for robust voltage monitoring and reset generation in harsh-environment microprocessor systems where reliability and temperature stability are critical.
FAQ
What is the reset threshold voltage of the ADM825TYKSZ-R7 and how does it vary with temperature?
The ADM825TYKSZ-R7 has a nominal reset threshold of 3.08 V at 25°C, with a specified range of 3.00 V to 3.15 V across −40°C to +125°C. Its temperature coefficient is 40 ppm/°C, resulting in ≤±15 mV total drift over the full automotive temperature range-ensuring consistent brownout detection in ECU and ADAS applications.
Does the ADM825TYKSZ-R7 include a watchdog timer function?
No, the ADM825TYKSZ-R7 does not include a watchdog timer. Per Table 1 and the Functional Block Diagram in the datasheet, only ADM823 and ADM824 variants feature watchdog input (WDI). The ADM825TYKSZ-R7 is configured exclusively for voltage supervision and manual reset, with pins 1 and 3 dedicated to dual push-pull reset outputs and pin 5 to MR.
What is the purpose of the dual RESET and RESET outputs on the ADM825TYKSZ-R7?
The dual outputs provide simultaneous active-low (Pin 1) and active-high (Pin 3) reset signals from a single device. This eliminates the need for external inverters or pull resistors in systems requiring both polarities-for example, coordinating legacy ASICs that accept only active-low reset and modern MCUs expecting active-high assertion-reducing component count and timing skew.
Can the ADM825TYKSZ-R7 operate reliably at VCC = 1.2 V?
Yes. The ADM825TYKSZ-R7 guarantees valid reset output states (both RESET and RESET) down to VCC = 1 V, as confirmed in the "RESET Output Voltage" section of the datasheet. At VCC = 1.2 V, the outputs remain functional with sink/source capability, enabling fail-safe behavior during deep undervoltage events common in automotive cold-crank scenarios.
Is an external pull-up resistor required on the MR pin of the ADM825TYKSZ-R7?
No. The ADM825TYKSZ-R7 integrates a 52 kΩ internal pull-up resistor on the MR pin (Pin 5), as documented in Table 4 and the Applications Information section. This allows direct connection of a momentary switch between MR and GND without external components-simplifying design and improving noise immunity through on-chip debounce.
ADM825TYKSZ-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- 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:
- SC-70-5
ADM825TYKSZ-R7 FAQ
1.How can I place an order for ADM825TYKSZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM825TYKSZ-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 ADM825TYKSZ-R7 reliable?
The price and inventory of ADM825TYKSZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM825TYKSZ-R7 is usually 5 days.
3.What payment methods are accepted for ADM825TYKSZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM825TYKSZ-R7 transactions.
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4.How is shipping managed for ADM825TYKSZ-R7?
ADM825TYKSZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM825TYKSZ-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 ADM825TYKSZ-R7?
For technical support, including ADM825TYKSZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM825TYKSZ-R7 requirements.
6.How does Aetrix verify that ADM825TYKSZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADM825TYKSZ-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 ADM825TYKSZ-R7 meets industry standards.
7.What is the process for return or replacement of ADM825TYKSZ-R7?
All ADM825TYKSZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM825TYKSZ-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 ADM825TYKSZ-R7 part is unused and in its original packaging.
Return procedure for ADM825TYKSZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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