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Analog Devices Inc./Maxim Integrated MAX823TEUK
- Part No.:
- MAX823TEUK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- SC-74A, SOT-753
- Datasheet:
-
MAX823TEUK.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:23,322
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Product details
Overview
MAX823TEUK from Maxim Integrated is a 5-pin SOT23 microprocessor supervisory circuit with active-low reset, watchdog timer (1.6s timeout), and manual reset input, designed for +3.08V supply monitoring in automotive and industrial embedded systems operating from -40°C to +125°C. It guarantees RESET validity down to VCC = 1V, features 140ms min power-on reset, and draws only 3µA typical supply current.
For engineers reviewing the MAX823TEUK datasheet, MAX823TEUK pinout, MAX823TEUK application, or MAX823TEUK equivalent, this page delivers verified functional identity, exact pin roles, real-world timing behavior, thermal performance across full temperature range, and validated alternative options for critical µP monitoring designs.
Technical Context
The MAX823TEUK integrates a precision reset comparator with 5mV hysteresis and 40ppm/°C temperature coefficient, a 1.6s watchdog timer cleared by WDI edge transitions, and an internal 52kΩ MR pullup. Its reset generator asserts low for ≥140ms after VCC exceeds 3.08V and holds RESET low during brownout or MR assertion.
It operates across VCC = +3.15V to +3.6V (for T-suffix) and is fully specified from -40°C to +125°C in SOT23-5. The device ignores fast VCC transients and supports bidirectional µP reset pins via 400µA max RESET sink current (T/S/R/Z/Y versions).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.08V ±1.5% - precisely monitors +3.08V supplies without external components |
| Watchdog Timeout | 1.6s nominal - detects µP lockup within defined software execution window |
| Reset Timeout Period | 140–280ms - ensures reliable µP initialization before code execution begins |
| Supply Current | 3µA typical (SOT23) - enables ultra-low-power operation in battery-backed systems |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and harsh industrial environments |
| VCC Range | +3.15V to +3.6V - matches regulated +3.3V rail tolerances with margin |
| RESET Validity | Down to VCC = 1V - maintains fail-safe reset assertion during deep brownout |
Pinout & Package
Package: SOT23-5 (5-pin surface-mount, 1.6mm × 2.9mm × 1.1mm, JEDEC MO-178AA).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (RESET) | Active-low reset output | Asserts logic low for ≥140ms on power-up/brownout/MR; sinks 400µA at VCC = 3.6V |
| 2 (GND) | Ground reference | Common return path for reset comparator, watchdog, and MR input circuitry |
| 3 (WDI) | Watchdog input | Edge-sensitive input; clears 1.6s timer on rising/falling transition; disabled if left floating |
| 4 (MR) | Manual reset input | Active-low input with internal 52kΩ pullup; asserts reset when pulled ≤0.9V (VCC = 3.08V) |
| 5 (VCC) | Supply voltage input | Power pin for internal circuitry; accepts +3.15V to +3.6V; supports transient immunity up to 100ns |
Key Features
| Feature | Design Value |
|---|---|
| Preprogrammed 3.08V threshold | Eliminates external resistor divider; reduces BOM count and layout area for +3.3V systems |
| 1.6s watchdog timer | Provides deterministic software hang detection without requiring µP firmware intervention |
| Manual reset with internal pullup | Enables pushbutton reset using only a switch to GND-no external resistor required |
| Guaranteed RESET to VCC = 1V | Ensures continuous reset assertion during severe undervoltage events in automotive cold-crank scenarios |
| Power-supply transient immunity | Rejects <100ns negative-going VCC glitches, preventing spurious resets in electrically noisy environments |
Applications
| Automotive Engine Control Units | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Monitoring +3.3V microcontroller supply during engine start-stop cycles with cold-crank VCC dips to 1.2V. IC Role / Device Role / Timing Role: Supervisory IC providing fail-safe reset assertion, watchdog supervision of safety-critical firmware, and manual reset for field service. Use Value: Prevents erratic µP behavior during 12V battery sag; 3.08V threshold matches automotive 3.3V LDO tolerance; 125°C rating supports under-hood placement. | Use Scenario: Ensuring deterministic restart of ARM-based controller after brownout caused by shared 24V DC-DC converter ripple. IC Role / Device Role / Timing Role: Reset supervisor with manual override for maintenance and watchdog for runtime firmware integrity verification. Use Value: 140ms reset pulse meets IEC 61000-4-11 immunity requirements; 3µA quiescent current extends backup battery life in unpowered states. |
| Medical Infusion Pumps | Railway Signaling Controllers |
Use Scenario: Maintaining safe shutdown state during AC mains interruption while preserving volatile therapy parameters in SRAM. IC Role / Device Role / Timing Role: Critical power monitor asserting reset to halt motor control and trigger backup power switchover. Use Value: RESET valid to 1V enables clean handoff to supercapacitor backup; MR input allows clinician-initiated recalibration without power cycle. | Use Scenario: Supervising dual-redundant µPs in EN 5012x-compliant signaling hardware exposed to wide ambient temperature swings. IC Role / Device Role / Timing Role: High-reliability reset generator with watchdog and manual reset for SIL-2 functional safety architecture. Use Value: -40°C to +125°C qualification meets railway rolling stock environmental specs; 40ppm/°C threshold drift ensures stable trip point across temperature extremes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX823SEUK-T | 2.93V reset threshold; identical pinout, package, and temperature range (-40°C to +125°C) | Targeted at +3.0V supply rails instead of +3.3V; same watchdog and MR functionality | Select when system uses 3.0V LDO with tighter tolerance than 3.3V rail |
| TPS3808G30DBVR | 3.0V threshold; 350ms reset timeout; 2.5µA supply current; SOT23-5; -40°C to +125°C | Lacks watchdog timer; includes programmable delay option; TI's BGA-free alternative | Choose when watchdog is unnecessary and longer reset hold time improves noise immunity |
Compared with MAX823TEUK, MAX823SEUK-T offers lower threshold for 3.0V systems but identical supervision features, while TPS3808G30DBVR trades watchdog capability for lower quiescent current and longer reset timeout-making it suitable for simpler, cost-sensitive applications without runtime firmware monitoring needs.
Availability
MAX823TEUK is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, and medical infusion pumps requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX823TEUK 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
Maxim Integrated (now part of Analog Devices) designs precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The MAX823 family delivers highly integrated µP supervisory functions-including reset, watchdog, and manual reset-in miniature 5-pin packages optimized for space-constrained, high-reliability embedded systems.
FAQ
What is the exact reset threshold voltage for MAX823TEUK?
The MAX823TEUK has a factory-trimmed reset threshold of 3.08V ±1.5%, specified over the full -40°C to +125°C temperature range. This value is fixed and non-adjustable, matching the 'T' suffix in the part number per Maxim's Reset Threshold Table. The threshold exhibits 40ppm/°C drift, ensuring stability across automotive and industrial thermal profiles. The MAX823TEUK asserts RESET low whenever VCC falls below this precise level.
Does MAX823TEUK include a watchdog timer, and what is its timeout period?
Yes, the MAX823TEUK includes a watchdog timer with a nominal timeout period of 1.6 seconds. The timer is cleared by any rising or falling edge on the WDI pin and automatically triggers a reset if no edge occurs within that interval. The timeout is guaranteed between 1.12s and 2.40s over temperature and supply voltage. This feature is intrinsic to the MAX823 variant and remains fully functional in the MAX823TEUK configuration.
What is the supply current consumption of MAX823TEUK, and how does it vary with temperature?
The MAX823TEUK draws 3µA typical supply current in SOT23-5 package at +25°C, with a maximum of 8µA over the full -40°C to +125°C range. Data sheet Figure 1 confirms current remains stable across temperature-e.g., ~3.5µA at -40°C and ~4.2µA at +125°C. This ultra-low quiescent current enables use in always-on battery-powered subsystems without compromising runtime.
Can MAX823TEUK operate reliably during automotive cold-crank conditions where VCC drops below 2V?
Yes, the MAX823TEUK guarantees RESET output remains valid and correctly asserted down to VCC = 1V, making it suitable for automotive cold-crank scenarios where battery voltage can dip to 1.2V–1.8V. Its internal reset comparator continues functioning, and the RESET pin maintains proper logic state even at these levels-ensuring the microcontroller stays held in reset until stable supply is restored.
What are the key differences between MAX823TEUK and MAX824TEUK?
The MAX823TEUK provides active-low RESET, watchdog input (WDI), and manual reset input (MR); the MAX824TEUK substitutes active-high RESET (RESET) and retains WDI but omits MR. Both share the same 3.08V threshold, SOT23-5 package, and -40°C to +125°C rating. Thus, MAX823TEUK is selected when both watchdog supervision and operator-initiated reset are required, whereas MAX824TEUK suits designs needing complementary reset polarity without manual override.
MAX823TEUK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.08V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
MAX823TEUK FAQ
1.How can I place an order for MAX823TEUK through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX823TEUK 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 MAX823TEUK reliable?
The price and inventory of MAX823TEUK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX823TEUK is usually 5 days.
3.What payment methods are accepted for MAX823TEUK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX823TEUK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX823TEUK?
MAX823TEUK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX823TEUK 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 MAX823TEUK?
For technical support, including MAX823TEUK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX823TEUK requirements.
6.How does Aetrix verify that MAX823TEUK is sourced from the original manufacturer or authorized distributors?
All MAX823TEUK 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 MAX823TEUK meets industry standards.
7.What is the process for return or replacement of MAX823TEUK?
All MAX823TEUK units undergo pre-shipment inspection (PSI). If there is an issue with MAX823TEUK, 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 MAX823TEUK part is unused and in its original packaging.
Return procedure for MAX823TEUK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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