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Analog Devices Inc. ADM825LYKS-R7
- Part No.:
- ADM825LYKS-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
ADM825LYKS-R7.pdf
- Description:
- IC SUPERVISOR W/RESET SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:14,780
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Product details
Overview
ADM825LYKS-R7 from Analog Devices is a supervisory circuit with manual reset input and dual push-pull reset outputs, designed for microprocessor supply voltage monitoring and code execution integrity assurance. It features a 4.63 V reset threshold, 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 automotive-grade embedded controllers requiring reliable brownout and manual recovery.
For engineers reviewing the ADM825LYKS-R7 datasheet, ADM825LYKS-R7 pinout, ADM825LYKS-R7 application, or ADM825LYKS-R7 equivalent, key selection factors include its manual reset capability, dual active-low/active-high RESET outputs, SC70-5 package footprint, and automotive temperature range compliance - all critical for robust system-level reset management in space-constrained designs.
Technical Context
The ADM825LYKS-R7 implements a precision bandgap-based voltage reference and comparator to monitor VCC against a fixed 4.63 V threshold (±25 mV over temperature), with 10 mV hysteresis. Its reset generator asserts both RESET (active low) and RESET (active high) outputs simultaneously for ≥140 ms after VCC rises above threshold or MR deassertion.
It includes an internal 52 kΩ pull-up on the MR pin, accepts ≥1 µs manual reset pulses, and guarantees valid output states even as VCC falls to 1 V. Unlike ADM823/ADM824, it omits watchdog functionality, simplifying firmware integration where external supervision suffices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.63 V (typ), 4.50–4.75 V (min/max over −40°C to +125°C); ensures reliable detection of 5 V rail brownout. |
| Reset Timeout | 140–280 ms (min/typ/max); provides sufficient hold time for microprocessor initialization and clock stabilization. |
| Supply Current | 5 µA (typ) at VCC = 4.75–5.5 V; enables use in always-on battery-backed subsystems without significant drain. |
| Operating Voltage Range | 1.2–5.5 V (over full temp range); supports valid reset assertion during deep undervoltage conditions. |
| Output Type | Dual push-pull: RESET (active low), RESET (active high); eliminates need for external pull-ups/downs in most MCU interfaces. |
| MR Input Threshold | 0.3 × VCC to 0.7 × VCC; compatible with standard CMOS logic levels across full VCC range. |
| MR Pulse Width | ≥1 µs minimum; accommodates mechanical switch bounce without false triggering. |
Pinout & Package
ADM825LYKS-R7 is housed in a 5-lead SC70 (KS-5) package, measuring 2.00 mm × 1.25 mm × 0.90 mm, optimized for high-density PCB layouts in automotive and portable applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull reset output; sinks 3.2 mA at VCC = VTH min; asserts during VCC undervoltage or MR activation. |
| 2 | GND | Ground reference for internal comparators and output drivers; must be connected to system ground plane. |
| 3 | RESET | Active-high push-pull reset output; sources 150 µA at VCC ≥ 1.8 V; complements active-low signal for mixed-logic systems. |
| 4 | VCC | Power supply input monitored for undervoltage; also powers internal circuitry; requires local 0.1 µF bypass capacitor. |
| 5 | MR | Manual reset input (active low); internally pulled up to VCC via 52 kΩ; debounced on-chip; triggers reset when held low ≥1 µs. |
Key Features
| Feature | Design Value |
|---|---|
| Dual push-pull reset outputs | Eliminates external resistors for both active-low and active-high MCU reset inputs, reducing BOM count and layout area. |
| Guaranteed reset validity to VCC = 1 V | Ensures deterministic reset behavior during power-down sequences, preventing metastability in downstream logic. |
| Internal 52 kΩ MR pull-up | Removes need for external pull-up resistor, simplifying board design and improving reliability in noisy environments. |
| Automotive temperature range | −40°C to +125°C operation validated per AEC-Q100 stress test conditions, suitable for under-hood and infotainment modules. |
| SC70-5 package footprint | Enables placement in tight spaces (e.g., near microcontrollers or PMICs) while maintaining thermal performance via 146°C/W θJA. |
Applications
| Automotive Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
Use Scenario: Monitors 5 V supply rail in ECU mainboard during cold cranking and load dump events. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout detection, and operator-initiated reset via dashboard service button. Use Value: Prevents corrupted firmware execution during transient VCC dips below 4.5 V; dual RESET outputs interface directly with Infineon AURIX™ TRICORE™ reset pins. |
Use Scenario: Ensures deterministic restart of ARM Cortex-M4-based I/O processor after field wiring faults or hot-swap events. IC Role / Device Role / Timing Role: System-level reset manager asserting both active-low and active-high reset signals to separate FPGA configuration logic and MCU core. Use Value: 140 ms timeout aligns with industrial watchdog timer requirements; MR pin enables maintenance-mode reset without power cycling. |
| Medical Patient Monitor Mainboard | Smart Energy Meter Communication Module |
Use Scenario: Provides fail-safe reset during battery backup switchover in Class II medical devices operating from AC/DC and Li-ion sources. IC Role / Device Role / Timing Role: Precision voltage supervisor ensuring reset assertion before VCC drops below 4.6 V, meeting IEC 60601-1 safety timing constraints. Use Value: 4.63 V threshold matches nominal 5 V rail tolerance; SC70 package allows placement adjacent to isolated DC/DC converter without compromising creepage. |
Use Scenario: Manages reset sequencing for NB-IoT modem and metrology SoC during grid voltage sags and RF burst transmission current spikes. IC Role / Device Role / Timing Role: Dual-output supervisor enabling independent reset control of communication stack (active-high) and metering engine (active-low). Use Value: Low 5 µA quiescent current extends battery life in tamper-detection sleep mode; MR pin supports remote firmware recovery via optical port command. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT46D3+ | Single active-low reset output; 4.63 V threshold; 200 ms timeout; SOT-23-5 package. | Lacks active-high RESET output and MR internal pull-up; requires external pull-up resistor. | Select when only one reset polarity is needed and board space permits discrete pull-up. |
| TPS3808G33DBVR | 4.38 V threshold; adjustable delay option; 1.5 µA typical supply current; SOT-23-6 package. | Higher accuracy (0.5% threshold tolerance) but no manual reset input; different pinout and package size. | Choose for ultra-low-power applications where MR is unnecessary and tighter threshold tolerance is required. |
Compared with MAX6326UT46D3+ and TPS3808G33DBVR, ADM825LYKS-R7 uniquely delivers dual-polarity reset outputs with integrated MR pull-up in SC70-5, making it optimal for space-constrained automotive and industrial designs requiring both reset polarities and field-serviceable manual reset.
Availability
ADM825LYKS-R7 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC modules, medical patient monitors, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM825LYKS-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.
The ADM825 belongs to Analog Devices' precision supervisory circuits product line, engineered specifically for automotive and industrial systems demanding guaranteed reset behavior under extreme voltage transients and temperature extremes.
FAQ
What is the reset threshold voltage of the ADM825LYKS-R7?
The ADM825LYKS-R7 has a nominal reset threshold of 4.63 V, with a guaranteed range of 4.50 V to 4.75 V over the full −40°C to +125°C operating temperature range. This value is factory-trimmed and specified in Table 2 of the Rev. D datasheet. The threshold applies to the VCC supply being monitored and determines when the ADM825LYKS-R7 asserts its reset outputs during undervoltage conditions.
Does the ADM825LYKS-R7 include a watchdog timer function?
No, the ADM825LYKS-R7 does not include a watchdog timer. Per Table 1 in the datasheet, the ADM825 variant is defined by the presence of manual reset (MR) and dual push-pull outputs, but explicitly excludes watchdog functionality. Watchdog capability is available only in the ADM823 and ADM824 variants. The ADM825LYKS-R7 relies solely on VCC monitoring and MR input for reset generation.
What package type is used for the ADM825LYKS-R7?
The ADM825LYKS-R7 uses a 5-lead SC70 package (JEDEC MO-203-AA, Analog Devices KS-5). Its dimensions are 2.00 mm × 1.25 mm × 0.90 mm, with a 0.65 mm pitch. This compact surface-mount package is RoHS-compliant (denoted by "Z" in the part number suffix) and optimized for high-density automotive and portable PCB layouts.
How does the manual reset (MR) pin operate on the ADM825LYKS-R7?
The MR pin on the ADM825LYKS-R7 is an active-low input with an internal 52 kΩ pull-up to VCC. Driving MR below 0.3 × VCC for ≥1 µs asserts both reset outputs for the full 140 ms timeout period. The pin includes on-chip debounce and rejects noise pulses <100 ns. No external components are required unless enhanced noise immunity is needed (e.g., 0.1 µF capacitor to GND).
Can the ADM825LYKS-R7 operate with supply voltages below 2.0 V?
Yes, the ADM825LYKS-R7 guarantees valid reset output states down to VCC = 1 V, as confirmed in the "RESET Output Voltage" specifications on page 3 of the datasheet. However, its reset threshold remains fixed at 4.63 V - meaning it will assert reset whenever VCC falls below that level, and continue asserting until VCC rises above 4.63 V and the 140 ms timeout expires. Operation below 2.0 V is only relevant for reset deassertion timing, not threshold detection.
ADM825LYKS-R7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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:
- SC-70-5
ADM825LYKS-R7 FAQ
1.How can I place an order for ADM825LYKS-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM825LYKS-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 ADM825LYKS-R7 reliable?
The price and inventory of ADM825LYKS-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM825LYKS-R7 is usually 5 days.
3.What payment methods are accepted for ADM825LYKS-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM825LYKS-R7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADM825LYKS-R7?
ADM825LYKS-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM825LYKS-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 ADM825LYKS-R7?
For technical support, including ADM825LYKS-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM825LYKS-R7 requirements.
6.How does Aetrix verify that ADM825LYKS-R7 is sourced from the original manufacturer or authorized distributors?
All ADM825LYKS-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 ADM825LYKS-R7 meets industry standards.
7.What is the process for return or replacement of ADM825LYKS-R7?
All ADM825LYKS-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM825LYKS-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 ADM825LYKS-R7 part is unused and in its original packaging.
Return procedure for ADM825LYKS-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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