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Analog Devices Inc. ADM823TYKSZ-R7
- Part No.:
- ADM823TYKSZ-R7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
ADM823TYKSZ-R7.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,433
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Product details
Overview
ADM823TYKSZ-R7 from Analog Devices is a precision supervisory circuit with integrated watchdog timer and manual reset input, designed for microprocessor supply voltage monitoring in automotive-grade systems. It features a 3.08 V reset threshold (±50 mV over temperature), 140 ms minimum reset timeout, 1.6 sec watchdog timeout, push-pull active-low RESET output, and operates from VCC = 2.7 V to 3.6 V with 5 µA typical supply current. It is used in engine control units and battery-powered industrial controllers requiring reliable brownout detection and code execution integrity.
For engineers reviewing the ADM823TYKSZ-R7 datasheet, ADM823TYKSZ-R7 pinout, ADM823TYKSZ-R7 application, or ADM823TYKSZ-R7 equivalent, key selection criteria include reset threshold accuracy at 3.08 V, guaranteed reset validity down to VCC = 1 V, SC70-5 package footprint, watchdog pulse width tolerance (50 ns), and MR input glitch rejection (100 ns).
Technical Context
The ADM823TYKSZ-R7 implements a precision bandgap-based reset comparator with 40 ppm/°C temperature coefficient and 5 mV hysteresis, ensuring stable threshold behavior across −40°C to +125°C. Its watchdog timer resets on missing transitions at WDI - cleared by any logic edge (low-to-high or high-to-low) - and is disabled when WDI floats.
It integrates an internal 52 kΩ pull-up on the MR pin, enabling direct connection to a push-button without external components, and features power supply glitch immunity validated for transients up to 100 ns at 100 mV overdrive. The push-pull RESET output guarantees logic-low state down to VCC = 1 V with 3.2 mA sink capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08 V (typ), 3.00–3.15 V range over −40°C to +125°C - sets precise brownout detection point for 3.3 V systems |
| Reset Timeout | 140 ms (min) - ensures sufficient hold time for microprocessor initialization after power recovery |
| Watchdog Timeout | 1.6 sec (typ), 1.12–2.40 sec range - provides robust code-execution monitoring without false triggers |
| Supply Current | 5 µA (typ) at VCC = 3.3 V - enables use in always-on, low-power embedded nodes |
| Operating Voltage | 2.7 V to 3.6 V - matches nominal 3.3 V rail with margin for droop and ripple |
| MR Pulse Width | 1 µs (min) - supports fast, debounced manual reset via tactile switch |
| WDI Pulse Width | 50 ns (min) - allows high-frequency watchdog strobing without timing overhead |
Pinout & Package
ADM823TYKSZ-R7 is housed in a 5-lead SC70 (KS-5) package, 2.0 mm × 1.25 mm × 0.9 mm, RoHS-compliant, with gull-wing leads and 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - RESET | Active-low push-pull reset output | Asserts logic-low signal during VCC undervoltage, MR assertion, or watchdog timeout; sinks 3.2 mA at VTH min |
| 2 - GND | Ground reference | Primary return path for internal comparators, watchdog logic, and output stage; must be low-impedance |
| 3 - MR | Manual reset input | Active-low input with 52 kΩ internal pull-up; accepts ≥1 µs pulses; rejects <100 ns glitches |
| 4 - WDI | Watchdog input | Edge-sensitive input; any transition clears watchdog timer; floating disables watchdog function |
| 5 - VCC | Monitored supply voltage | Input for reset threshold comparison; supports operation down to 1 V while maintaining valid RESET output |
Key Features
| Feature | Design Value |
|---|---|
| Automotive temperature range | Qualified for −40°C to +125°C operation - suitable for under-hood and powertrain applications |
| Reset output validity | Guaranteed down to VCC = 1 V - ensures deterministic reset assertion during deep brownout |
| Internal MR pull-up | 52 kΩ resistor eliminates need for external component in push-button reset circuits |
| Power supply glitch immunity | Rejects transients ≤100 ns at 100 mV overdrive - prevents spurious resets in noisy environments |
| Low quiescent current | 5 µA typical - extends battery life in portable and energy-harvesting systems |
Applications
| Engine Control Unit (ECU) | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Monitors 3.3 V microcontroller supply during cold cranking, where battery voltage dips below 6 V causing regulator output sag. IC Role / Device Role / Timing Role: Supervisory circuit providing power-on reset, brownout reset, and watchdog-triggered recovery for main MCU. Use Value: Prevents ECU lockup during transient undervoltage by asserting RESET until VCC recovers above 3.08 V and holds for ≥140 ms. |
Use Scenario: Ensures deterministic startup and runtime supervision of ARM Cortex-M based I/O processor in modular automation hardware. IC Role / Device Role / Timing Role: Dual-role supervisor: initiates controlled boot sequence and monitors firmware execution via WDI strobes every 500 ms. Use Value: Guarantees system recovery from infinite loops or bus faults without operator intervention, using 1.6 sec watchdog timeout aligned to control cycle timing. |
| Portable Medical Monitor | Automotive Body Control Module (BCM) |
|
Use Scenario: Powers critical patient parameter display subsystem from a single-cell Li-ion battery (2.7–4.2 V range) with tight voltage margins. IC Role / Device Role / Timing Role: Low-power supervisor enabling safe shutdown and restart when battery voltage falls below 3.08 V. Use Value: Delivers 5 µA supply current and valid RESET down to VCC = 1 V - preserves last-known vital sign data before power loss. |
Use Scenario: Manages reset sequencing for multiple MCUs in door module, including window motor controller and proximity sensor hub. IC Role / Device Role / Timing Role: Centralized reset generator with manual reset input for service mode entry and watchdog supervision of safety-critical firmware. Use Value: Enables field technician-initiated reset via MR pin without disassembly, while maintaining ASIL-B compatible fault detection latency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar supervisory circuit applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326T31D2+T | 3.08 V reset threshold, no watchdog timer, open-drain RESET output, 1.6 µA supply current | Lacks watchdog functionality; requires external pull-up; suited for simpler reset-only designs | Select when watchdog is unnecessary and ultra-low current (<2 µA) is prioritized over functional redundancy |
| TPS3808G33DBVR | 3.3 V reset threshold (±0.5%), 200 ms reset timeout, no manual reset input, 16 µA supply current | Higher threshold mismatch for 3.3 V systems; lacks MR pin; optimized for TI ecosystem integration | Choose when system uses TI PMICs and 3.3 V threshold tolerance >50 mV is acceptable |
Compared with ADM823TYKSZ-R7, MAX6326T31D2+T reduces current draw but removes watchdog and MR functions, while TPS3808G33DBVR offers tighter threshold accuracy at the cost of higher current and no manual reset - making ADM823TYKSZ-R7 optimal for automotive applications requiring full-feature supervision in SC70 footprint.
Availability
ADM823TYKSZ-R7 is available at Aetrix Electronics and suitable for engine control units, industrial PLC modules, portable medical monitors, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADM823TYKSZ-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 since 1965.
The ADM823 family was engineered specifically for automotive and industrial microprocessor supervision, delivering precision reset thresholds, integrated watchdog timers, and robust operation across −40°C to +125°C in space-constrained SC70 and SOT-23 packages.
FAQ
What is the exact reset threshold voltage of the ADM823TYKSZ-R7 and how does it vary with temperature?
The ADM823TYKSZ-R7 has a nominal reset threshold of 3.08 V at 25°C, with a guaranteed range of 3.00 V to 3.15 V across −40°C to +125°C. Its temperature coefficient is 40 ppm/°C, resulting in ≤±10 mV drift over the full automotive temperature range - verified per Table 2 in the Rev. D datasheet.
Does the ADM823TYKSZ-R7 require external components for basic operation?
No. The ADM823TYKSZ-R7 operates autonomously with only VCC and GND connections. Its MR pin includes a 52 kΩ internal pull-up, and the WDI pin self-disables when floating. No external resistors, capacitors, or pull-ups are needed for power-on reset, watchdog, or manual reset functionality.
Can the ADM823TYKSZ-R7's watchdog timer be disabled, and if so, how?
Yes. The ADM823TYKSZ-R7 watchdog timer is automatically disabled when the WDI pin is left unconnected (floating). As stated in the Applications Information section, "a window comparator disconnects the watchdog timer from the reset output circuitry so that reset is not asserted when the watchdog timer times out." This is a hardware-level disable - no register write or configuration required.
What is the minimum pulse width the MR input accepts, and is debouncing handled internally?
The MR input of the ADM823TYKSZ-R7 accepts pulses as short as 1 µs, and internal debounce circuitry rejects transients ≤100 ns. This eliminates the need for external RC filters or firmware debouncing, enabling direct connection to mechanical push-buttons in harsh environments like automotive cabins or factory floors.
Is the ADM823TYKSZ-R7 pin-compatible with other members of the ADM823/824/825 family?
No. While all three parts share the same 5-lead SC70 pinout (RESET, GND, MR/RESET, WDI/MR, VCC), their pin functions differ: ADM823TYKSZ-R7 uses Pin 3 as MR and Pin 4 as WDI, whereas ADM824 uses Pin 3 as RESET and Pin 4 as WDI, and ADM825 uses Pin 3 as RESET and Pin 4 as MR. Swapping them without board revision causes functional failure.
ADM823TYKSZ-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
- 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
ADM823TYKSZ-R7 FAQ
1.How can I place an order for ADM823TYKSZ-R7 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADM823TYKSZ-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 ADM823TYKSZ-R7 reliable?
The price and inventory of ADM823TYKSZ-R7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADM823TYKSZ-R7 is usually 5 days.
3.What payment methods are accepted for ADM823TYKSZ-R7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADM823TYKSZ-R7 transactions.
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4.How is shipping managed for ADM823TYKSZ-R7?
ADM823TYKSZ-R7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADM823TYKSZ-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 ADM823TYKSZ-R7?
For technical support, including ADM823TYKSZ-R7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADM823TYKSZ-R7 requirements.
6.How does Aetrix verify that ADM823TYKSZ-R7 is sourced from the original manufacturer or authorized distributors?
All ADM823TYKSZ-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 ADM823TYKSZ-R7 meets industry standards.
7.What is the process for return or replacement of ADM823TYKSZ-R7?
All ADM823TYKSZ-R7 units undergo pre-shipment inspection (PSI). If there is an issue with ADM823TYKSZ-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 ADM823TYKSZ-R7 part is unused and in its original packaging.
Return procedure for ADM823TYKSZ-R7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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