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Analog Devices Inc. ADM825MYKSZ-R7
- Part No.:
- ADM825MYKSZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
ADM825MYKSZ-R7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,769
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Product details
Overview
ADM825MYKSZ-R7 from Analog Devices is a supervisory circuit with manual reset input and dual active-low/active-high push-pull reset outputs, designed for microprocessor voltage monitoring in automotive-grade systems. It features a 4.38 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. Used in engine control units and industrial PLCs where brownout resilience and external reset initiation are required.
For engineers reviewing the ADM825MYKSZ-R7 datasheet, ADM825MYKSZ-R7 pinout, ADM825MYKSZ-R7 application, or ADM825MYKSZ-R7 equivalent, key selection criteria include reset threshold accuracy, dual-output drive capability, manual reset pulse width tolerance (≥1 µs), and SC70-5 package compatibility with high-density PCB layouts.
Technical Context
The ADM825MYKSZ-R7 implements a precision bandgap-based reset comparator with 40 ppm/°C temperature coefficient and 5 mV hysteresis, ensuring stable trip point across automotive temperature extremes. Its dual push-pull outputs (RESET and RESET) provide simultaneous active-low and active-high signaling without external pull resistors.
It integrates an internal 52 kΩ MR pull-up resistor and debounces manual reset inputs with 100 ns glitch rejection. Unlike ADM823/ADM824, it omits watchdog functionality-enabling simplified firmware integration where code execution integrity is handled externally or not required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.38 V (typ), 4.25–4.50 V range over −40°C to +125°C - matches 4.5 V rail supervision with margin for ripple and drift |
| Reset Timeout | 140–280 ms - ensures sufficient hold time for microprocessor power stabilization after VCC rise |
| Supply Current | 5 µA (typ) at VCC = 2.7–3.6 V - enables use in always-on battery-backed subsystems |
| Operating Voltage Range | 2.25–2.75 V (ADM82xY), 2.38–2.75 V (ADM82xZ), 2.7–3.6 V (ADM82xR), 3.0–3.6 V (ADM82xS), 3.15–3.6 V (ADM82xT), 4.5–5.5 V (ADM82xM) - supports multiple logic families including 3.3 V and 5 V systems |
| Output Drive | Push-pull RESET and RESET - eliminates need for external pull-up/pull-down resistors; sinks 1.2 mA / sources 30 µA minimum |
| 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 - allows reliable assertion via mechanical push-button without timing-critical firmware |
Pinout & Package
ADM825MYKSZ-R7 is housed in a 5-lead SC70 (KS-5) package per JEDEC MO-203-AA, measuring 2.00 mm × 1.25 mm × 0.90 mm with 0.65 mm lead pitch. The package supports reflow soldering and is RoHS compliant (Z suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | RESET | Active-low push-pull output - asserts low when VCC < 4.38 V, MR pulled low, or during reset timeout; valid to VCC = 1 V |
| 2 | GND | Ground reference - must be connected directly to system ground plane for noise immunity |
| 3 | RESET | Active-high push-pull output - complements Pin 1; asserts high under same conditions as Pin 1 assert |
| 4 | VCC | Monitored supply input - connects to the voltage rail being supervised (e.g., 4.5 V microcontroller core) |
| 5 | MR | Manual reset input - active-low, internally pulled up to VCC via 52 kΩ; ≥1 µs low pulse triggers reset |
Key Features
| Feature | Design Value |
|---|---|
| Dual complementary reset outputs | Simultaneous active-low and active-high signals eliminate level-shifting or inverter logic in mixed-voltage systems |
| Automotive temperature grade | −40°C to +125°C operation with guaranteed parameters - suitable for under-hood and industrial control environments |
| Internal MR pull-up | 52 kΩ on-chip resistor removes need for external biasing, reducing BOM count and board space |
| Glitch-immune MR input | 100 ns noise rejection on manual reset line prevents spurious resets from switch bounce or EMI |
| Low-power supervision | 5 µA typical supply current enables integration into energy-sensitive applications like telematics modules |
Applications
| Engine Control Unit (ECU) | Industrial Programmable Logic Controller (PLC) |
|---|---|
Use Scenario: Monitors 5 V sensor interface rail during cold cranking, where battery voltage dips below 6 V and causes transient undervoltage. IC Role / Device Role / Timing Role: Supervisory circuit asserting hardware reset to MCU when VCC falls below 4.38 V, holding reset for ≥140 ms after recovery. Use Value: Prevents MCU lockup during engine start by guaranteeing clean reset release only after stable 5 V rail restoration. |
Use Scenario: Provides fail-safe reset for ARM-based controller in factory automation cabinet exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Dual-output reset generator enabling direct connection to both legacy 5 V FPGA configuration logic and modern 3.3 V processor reset pins. Use Value: Eliminates discrete inverters or voltage translators while maintaining automotive-grade reliability across −40°C to +125°C. |
| Telematics Control Unit (TCU) | Rail-to-Rail Sensor Interface Module |
Use Scenario: Powers on cellular modem and GPS receiver from vehicle battery; requires reliable reset during ignition cycling and sleep-mode wakeups. IC Role / Device Role / Timing Role: Manual reset input triggered by CAN bus command via GPIO-driven MR pin, initiating controlled system reboot without physical button. Use Value: Enables remote firmware recovery via software-controlled MR assertion, reducing field service visits. |
Use Scenario: Interfaces 2.5 V analog front-end with 3.3 V digital signal processor in condition-monitoring vibration sensor. IC Role / Device Role / Timing Role: Supervises 3.3 V DSP supply and provides synchronized active-low reset to DSP and active-high reset to AFE, aligning power sequencing. Use Value: Ensures deterministic startup order between analog and digital domains without external timing components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADM825MYRJZ-R7 | SOT-23-5 package (RJ-5), identical electrical specs and reset threshold | Larger footprint (3.0 × 1.7 mm vs. 2.0 × 1.25 mm); better thermal dissipation but higher board area cost | Select for hand-soldering feasibility or thermal margin requirements exceeding SC70 limits |
| TPS3808G33DBVR | Texas Instruments part with 3.3 V reset threshold, 200 ms timeout, and open-drain output (requires external pull-up) | Lacks dual-output capability and manual reset input; rated only to +85°C (not automotive) | Choose only for non-automotive 3.3 V systems where dual outputs and extended temperature are unnecessary |
Compared with ADM825MYKSZ-R7, the SOT-23 variant offers mechanical robustness and easier rework, while the TPS3808G33DBVR reduces cost in commercial-grade 3.3 V designs but sacrifices automotive qualification, dual outputs, and manual reset - making ADM825MYKSZ-R7 irreplaceable for compact, high-reliability dual-rail reset applications.
Availability
ADM825MYKSZ-R7 is available at Aetrix Electronics and suitable for engine control units, industrial PLCs, telematics control units, and rail-to-rail sensor interface modules requiring stable component supply across automotive and extended-temperature industrial programs.
Supply support for ADM825MYKSZ-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 measurement and control systems.
The ADM825 belongs to Analog Devices' supervisory circuits product line, engineered specifically for robust power monitoring and reset generation in automotive, industrial, and mission-critical embedded systems where reliability under voltage transients and extreme temperatures is mandatory.
FAQ
What is the exact reset threshold voltage of the ADM825MYKSZ-R7 and how does it vary with temperature?
The ADM825MYKSZ-R7 has a nominal reset threshold of 4.38 V at 25°C, with a guaranteed range of 4.25 V to 4.50 V across the full −40°C to +125°C operating temperature range. Its temperature coefficient is tightly controlled at 40 ppm/°C, meaning the threshold shifts no more than ±0.5% over the entire automotive temperature span - critical for consistent brownout detection in ECU and TCU applications.
Does the ADM825MYKSZ-R7 include a watchdog timer function?
No, the ADM825MYKSZ-R7 does not include a watchdog timer. Per Table 1 in the datasheet, only ADM823 and ADM824 feature watchdog input (WDI); ADM825 is explicitly defined as having manual reset (MR) but no watchdog capability. This makes ADM825MYKSZ-R7 ideal for systems where external software or hardware handles code execution monitoring, simplifying design and reducing current draw.
Can the ADM825MYKSZ-R7 operate reliably at VCC = 1 V, and what happens to its outputs below that level?
Yes, the ADM825MYKSZ-R7 guarantees valid reset output states down to VCC = 1 V - both RESET (active-low) and RESET (active-high) meet their specified sink/source levels at this voltage. Below 1 V, outputs become undefined per Absolute Maximum Ratings; however, Figure 17 in the datasheet shows how external 100 kΩ pull resistors can extend functional reset validity down to VCC = 0 V if required for ultra-low-power shutdown sequencing.
What is the minimum pulse width required on the MR pin to trigger a reset on the ADM825MYKSZ-R7?
The ADM825MYKSZ-R7 requires a minimum MR input pulse width of 1 µs to reliably assert reset, as confirmed in Table 4 and Figure 13 of the datasheet. This specification holds across the full −40°C to +125°C temperature range, and the integrated 52 kΩ internal pull-up ensures MR remains high when unconnected - enabling simple push-button implementation without external biasing components.
Is the ADM825MYKSZ-R7 pin-compatible with other parts in the ADM823/ADM824/ADM825 family?
Yes, all ADM823/ADM824/ADM825 variants share identical 5-pin SC70 (KS-5) and SOT-23 (RJ-5) pinouts per Figures 2–4. The ADM825MYKSZ-R7 uses Pin 1 = RESET (active-low), Pin 2 = GND, Pin 3 = RESET (active-high), Pin 4 = VCC, Pin 5 = MR - matching the ADM825 pin configuration exactly. This allows drop-in replacement within the same package type when switching between reset thresholds or output configurations.
ADM825MYKSZ-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:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.38V
- 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
ADM825MYKSZ-R7 FAQ
1.How can I place an order for ADM825MYKSZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM825MYKSZ-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 ADM825MYKSZ-R7 reliable?
The price and inventory of ADM825MYKSZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM825MYKSZ-R7 is usually 5 days.
3.What payment methods are accepted for ADM825MYKSZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM825MYKSZ-R7 transactions.
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4.How is shipping managed for ADM825MYKSZ-R7?
ADM825MYKSZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM825MYKSZ-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 ADM825MYKSZ-R7?
For technical support, including ADM825MYKSZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM825MYKSZ-R7 requirements.
6.How does Aetrix verify that ADM825MYKSZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADM825MYKSZ-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 ADM825MYKSZ-R7 meets industry standards.
7.What is the process for return or replacement of ADM825MYKSZ-R7?
All ADM825MYKSZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM825MYKSZ-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 ADM825MYKSZ-R7 part is unused and in its original packaging.
Return procedure for ADM825MYKSZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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