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Analog Devices Inc. ADM823MYKSZ-R7
- Part No.:
- ADM823MYKSZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
ADM823MYKSZ-R7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,993
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Product details
Overview
ADM823MYKSZ-R7 from Analog Devices is a supervisory circuit with integrated watchdog timer and manual reset input, designed to monitor VCC supply voltage (4.31 V to 4.45 V threshold) and ensure microprocessor system reliability during power-up, brownout, and code lockup events. It delivers a 140 ms minimum reset timeout, 1.6 s typical watchdog timeout, push-pull active-low RESET output, and operates across −40°C to +125°C in automotive-grade applications.
For engineers reviewing the ADM823MYKSZ-R7 datasheet, ADM823MYKSZ-R7 pinout, ADM823MYKSZ-R7 application, or ADM823MYKSZ-R7 equivalent, key selection criteria include reset threshold accuracy (±30 mV over temperature), guaranteed reset validity down to VCC = 1 V, low 5 µA quiescent current, SC70-5 package footprint, and compatibility with manual reset push-button interfaces.
Technical Context
The ADM823MYKSZ-R7 implements a precision bandgap-based voltage reference with 40 ppm/°C temperature coefficient and 5 mV hysteresis to generate stable reset assertion at 4.38 V (typ). Its internal watchdog detector clears on any WDI logic transition (≥50 ns pulse width) and times out after 1.6 s if unserviced - directly linking microprocessor software health to hardware reset generation.
Reset assertion occurs under three independent conditions: VCC falling below 4.38 V, MR pin pulled low ≥1 µs, or WDI idle beyond watchdog timeout. The push-pull RESET output remains asserted for ≥140 ms after recovery, ensuring sufficient deassertion hold time for microprocessor initialization sequences.
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 - ensures reliable detection of 4.5 V nominal supply brownout |
| Reset Timeout | 140–280 ms - guarantees minimum reset pulse width for full microprocessor core and peripheral initialization |
| Watchdog Timeout | 1.12–2.40 s - provides configurable safety margin for firmware execution loops without false triggers |
| Supply Current | 5 µA (typ) at VCC = 4.5 V - enables integration into always-on battery-backed subsystems |
| RESET Output Type | Active-low push-pull - drives standard CMOS reset inputs without external pull-up resistor |
| VCC Validity Range | 1 V to 5.5 V - maintains valid RESET state during deep brownout and fast power ramp-up |
| MR Input Pull-up | 52 kΩ internal - eliminates need for external biasing when using momentary push-button reset |
Pinout & Package
ADM823MYKSZ-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. Pin 1 is RESET (active-low push-pull), Pin 2 is GND, Pin 3 is MR (manual reset input), Pin 4 is VCC (monitored supply), and Pin 5 is WDI (watchdog input).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Asserts logic low to microprocessor reset pin during fault; sinks 3.2 mA at VTH min; valid down to VCC = 1 V |
| 2 - GND | Ground reference | Common return path for internal comparators, watchdog, and reset generator; must be low-impedance |
| 3 - MR | Manual reset input | Active-low signal; 1 µs minimum pulse width; internally pulled up to VCC via 52 kΩ resistor |
| 4 - VCC | Monitored supply voltage input | Primary power source and supervision target; supports operation from 1 V to 5.5 V |
| 5 - WDI | Watchdog input | Edge-sensitive timer clear input; detects ≥50 ns transitions; draws ≤160 µA when high |
Key Features
| Feature | Design Value |
|---|---|
| Automotive temperature range | Rated for −40°C to +125°C operation - suitable for engine control, ADAS, and body electronics without derating |
| Power supply glitch immunity | Detects transients ≥100 ns duration only when exceeding threshold overdrive - prevents spurious resets in noisy environments |
| Guaranteed reset validity to VCC = 1 V | Ensures deterministic reset behavior during deep brownout - critical for fail-safe shutdown sequencing |
| Internal MR pull-up | 52 kΩ resistor eliminates external components for push-button reset interface - reduces BOM count and layout area |
| SC70-5 footprint | 2.0 mm × 1.25 mm outline - enables compact placement near microprocessors in space-constrained automotive modules |
Applications
| Engine Control Unit (ECU) | Infotainment Head Unit |
|---|---|
Use Scenario: Monitors 5 V supply rail in diesel/gasoline ECU during cold cranking where battery voltage dips to 6–9 V. IC Role / Device Role / Timing Role: Supervisory circuit asserting active-low RESET to MCU when VCC falls below 4.38 V or software hangs. Use Value: Prevents corrupted flash writes and undefined state during undervoltage; 140 ms reset pulse ensures full MCU register initialization before boot. | Use Scenario: Provides power-on reset and watchdog supervision for ARM-based infotainment SoC during ignition cycle and runtime. IC Role / Device Role / Timing Role: Dual-role supervisor: generates clean POR signal at power-up and monitors firmware liveliness via WDI strobing. Use Value: Eliminates need for discrete RC reset and external watchdog IC - reduces component count while maintaining ASIL-B readiness. |
| Advanced Driver Assistance System (ADAS) Camera Module | Telematics Control Unit (TCU) |
Use Scenario: Ensures reliable startup and crash recovery of image signal processor in rear-view camera exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: Reset generator and watchdog enforcer; MR pin connected to service button for field firmware recovery. Use Value: 5 µA quiescent current extends battery backup life; −40°C to +125°C rating matches camera housing thermal profile. | Use Scenario: Supervises LTE modem and GPS receiver power rails in always-connected TCU with cellular wake-on-event requirements. IC Role / Device Role / Timing Role: Primary system supervisor monitoring 3.3 V and 1.8 V rails via separate ADM823 variants; MR used for remote OTA reset initiation. Use Value: Internal 52 kΩ MR pull-up simplifies GPIO interfacing from baseband processor; SC70 package fits dense RF-shielded layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326UT43D3+T | 4.33 V reset threshold, no watchdog timer, open-drain RESET output | Lacks code-execution monitoring; requires external pull-up resistor | Select when watchdog functionality is unnecessary and board space allows for pull-up component |
| TPS3808G33DBVR | 3.3 V fixed threshold, 200 ms reset timeout, no manual reset input | Designed for 3.3 V systems only; lacks MR pin for field service reset | Choose for cost-sensitive 3.3 V applications where manual reset is not required |
Compared with MAX6326UT43D3+T and TPS3808G33DBVR, the ADM823MYKSZ-R7 uniquely combines 4.38 V precision threshold, integrated watchdog timer, manual reset input, and push-pull output in a single SC70-5 package - enabling robust, self-contained supervision for automotive microcontrollers without external components.
Availability
ADM823MYKSZ-R7 is available at Aetrix Electronics and suitable for automotive engine control units, ADAS camera modules, infotainment head units, and telematics control units requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM823MYKSZ-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 with precision power management and signal conditioning solutions.
The ADM823 family is part of Analog Devices' supervisory IC portfolio, engineered specifically for automotive-grade microprocessor system reliability - delivering accurate voltage monitoring, deterministic reset timing, and watchdog-based software fault recovery in harsh environments.
FAQ
What is the exact reset threshold voltage of the ADM823MYKSZ-R7?
The ADM823MYKSZ-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. This value is factory-trimmed and specified in Table 2 of the Rev. D datasheet under the ADM82xM designation.
Does the ADM823MYKSZ-R7 require an external pull-up resistor on the MR pin?
No, the ADM823MYKSZ-R7 includes an internal 52 kΩ pull-up resistor on the MR pin, as confirmed in Table 4 and the Manual Reset Input section of the datasheet. This eliminates the need for an external component when implementing push-button reset functionality.
Can the ADM823MYKSZ-R7 operate reliably at VCC = 1.2 V?
Yes, the ADM823MYKSZ-R7 guarantees valid RESET output behavior down to VCC = 1 V, as explicitly stated in the Features list and Reset Output section. At 1.2 V, the device continues to assert RESET correctly when VCC is below threshold and maintains logic-level integrity per the sink/source specifications.
What is the watchdog timeout period for the ADM823MYKSZ-R7?
The ADM823MYKSZ-R7 features a watchdog timeout period of 1.6 s (typical), with a guaranteed range of 1.12 s to 2.40 s over temperature and supply voltage, as documented in Table 2 under "Watchdog Timeout Period" for ADM823/ADM824 devices.
Is the ADM823MYKSZ-R7 pin-compatible with other ADM823 variants in SC70-5 packaging?
Yes, all ADM823 variants in the KS-5 (SC70-5) package - including ADM823LYKSZ-R7, ADM823MYKSZ-R7, and ADM823TYKSZ-R7 - share identical pinout, footprint, and electrical interface. Only the reset threshold voltage differs between variants; all functional pins (RESET, GND, MR, VCC, WDI) retain the same assignment and behavior.
ADM823MYKSZ-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
- Reset:
- 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
ADM823MYKSZ-R7 FAQ
1.How can I place an order for ADM823MYKSZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM823MYKSZ-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 ADM823MYKSZ-R7 reliable?
The price and inventory of ADM823MYKSZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM823MYKSZ-R7 is usually 5 days.
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Once your ADM823MYKSZ-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 ADM823MYKSZ-R7?
For technical support, including ADM823MYKSZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM823MYKSZ-R7 requirements.
6.How does Aetrix verify that ADM823MYKSZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADM823MYKSZ-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 ADM823MYKSZ-R7 meets industry standards.
7.What is the process for return or replacement of ADM823MYKSZ-R7?
All ADM823MYKSZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM823MYKSZ-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 ADM823MYKSZ-R7 part is unused and in its original packaging.
Return procedure for ADM823MYKSZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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