My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX819MCUA+T
- Part No.:
- MAX819MCUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX819MCUA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,832
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX819MCUA+T from Maxim Integrated is a +5V microprocessor supervisory circuit with manual reset input, active-low reset output, battery backup switchover, and power-fail comparator functionality. It features a 4.40V ±10% reset threshold, 200ms reset timeout, 11µA quiescent supply current, and operates in 0°C to +70°C temperature range. Designed for portable and battery-powered µP systems requiring reliable brownout protection and nonvolatile memory retention.
For engineers reviewing the MAX819MCUA+T datasheet, MAX819MCUA+T pinout, MAX19MCUA+T application, or MAX819MCUA+T equivalent, this device delivers verified manual reset control, battery-freshness seal enablement, VCC-to-OUT and BATT-to-OUT switching paths, and PFI/PFO-based low-voltage warning - all in an 8-pin µMAX package suitable for space-constrained embedded designs.
Technical Context
The MAX819MCUA+T integrates a precision reset comparator with 4.40V threshold (±10%), a manual reset input (MR) with internal 63kΩ pull-up, and a power-fail comparator (PFI/PFO) referenced to 1.25V. Its reset generator guarantees 200ms minimum assertion time after VCC rise, brownout recovery, or MR deassertion.
Battery switchover logic activates when VCC falls below both VRST (4.40V) and VBATT, connecting BATT to OUT via an 80Ω PMOS switch; VCC-to-OUT path uses a 5Ω PMOS switch during normal operation. The battery freshness seal is enabled only when MR is high or open and triggered by controlled VCC cycling with PFO grounded.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±10% - sets brownout detection level for +5V systems; triggers reset when VCC drops below this voltage |
| Reset Timeout Period | 200ms typical - ensures µP remains held in reset long enough for stable power rail recovery |
| Supply Current | 11µA typical at +25°C - enables multi-year battery life in portable applications with no load |
| Manual Reset Input | Active-low with 63kΩ internal pull-up - supports direct switch-to-ground or TTL/CMOS logic drive without external components |
| Power-Fail Comparator | 1.25V reference on PFI - provides configurable undervoltage warning independent of reset function |
| Battery Switchover Threshold | VCC < VBATT - automatically transfers RAM supply from VCC to BATT during power failure |
| Operating Temperature | 0°C to +70°C - validated for commercial-grade embedded controller and instrumentation environments |
Pinout & Package
MAX819MCUA+T is housed in an 8-pin µMAX package (3mm × 3mm, 0.8mm height), compatible with SO-8 and DIP-8 footprints but offering 60% area reduction. Pin functions are electrically validated per Maxim's official datasheet revision 3 (12/05).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 OUT | Supply output for CMOS RAM | Switches between VCC (via 5Ω PMOS) and BATT (via 80Ω PMOS) based on VCC/VBATT comparison |
| 2 VCC | +5V main supply input | Primary power source; powers internal circuitry and enables VCC-to-OUT path above reset threshold |
| 3 GND | Ground reference | 0V return for all analog and digital functions; required for reset comparator reference stability |
| 4 PFI | Power-fail comparator input | Monitors external voltage divider; asserts PFO low when input falls below 1.25V threshold |
| 5 PFO | Power-fail comparator output | Open-drain output used for low-battery warning or to trigger MR-driven reset on MAX819 |
| 6 WDI | Watchdog input | Not implemented on MAX819 - pin is no-connect; watchdog function absent per Selector Guide |
| 7 RESET | Active-low reset output | Drives µP reset pin low for ≥200ms during power-up, brownout, or MR assertion |
| 8 BATT | Backup battery input | Accepts 2.0V–6.0V battery; supplies OUT and internal circuitry when VCC fails |
Key Features
| Feature | Design Value |
|---|---|
| Manual Reset Input (MR) | Active-low with integrated 63kΩ pull-up resistor - eliminates external biasing and supports momentary switch or logic-level assertion |
| Battery Freshness Seal | Enables OEM battery preservation by disconnecting BATT from internal circuitry until first power cycle with PFO grounded |
| Power-Fail Comparator | Dedicated 1.25V reference on PFI - allows independent monitoring of secondary supplies (e.g., 3.3V rails) without affecting reset behavior |
| VCC/BATT Switchover Logic | Automatic dual-path switching with hysteresis - maintains RAM power continuity during brownouts while minimizing standby current (<1µA) |
| Low Quiescent Current | 11µA typical supply current - extends shelf life and operational runtime in battery-backed systems |
Applications
| Portable Medical Monitors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Battery-powered ECG or glucose meter retaining real-time sensor data during AC power loss or battery swap. IC Role / Device Role / Timing Role: Supervisory circuit asserting RESET to halt µP execution and enabling BATT→OUT switchover to preserve SRAM contents. Use Value: Prevents data corruption during power transitions; 11µA supply current extends single-CR2032 battery life beyond 5 years in sleep mode. |
Use Scenario: DIN-rail mounted programmable logic controller maintaining configuration memory during factory line voltage sags. IC Role / Device Role / Timing Role: Brownout detector triggering controlled µP reset and activating backup battery to sustain volatile registers and real-time clock. Use Value: 200ms reset timeout exceeds typical PLC boot sequence requirements; 4.40V threshold aligns with industrial +5V supply tolerances (±10%). |
| Smart Energy Meters | Point-of-Sale Terminals |
Use Scenario: Revenue-grade electricity meter logging kWh data to EEPROM during grid outage. IC Role / Device Role / Timing Role: Power-fail comparator (PFI/PFO) detecting AC/DC converter drop and initiating graceful shutdown via MR-linked reset. Use Value: Configurable PFI threshold enables precise trip point for auxiliary 3.3V rail; eliminates need for separate supervisor IC. |
Use Scenario: Retail terminal preserving transaction buffer and encryption keys during unexpected power interruption. IC Role / Device Role / Timing Role: Manual reset input (MR) driven by front-panel button to force safe reboot without cycling main power. Use Value: Internal 63kΩ pull-up removes external resistor; 150ns MR-to-RESET delay ensures deterministic response across temperature range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX819LCTA+ | Same functionality but in 8-pin TDFN (3mm × 3mm) package; identical electrical specs and pinout mapping | Requires PCB redesign for TDFN footprint; offers same thermal performance and moisture sensitivity level (MSL3) | Select for designs prioritizing board-level reflow compatibility over µMAX hand-solderability |
| TPS3808G33DBVR | TI part with 3.3V reset threshold, no battery switchover or PFI/PFO; includes watchdog timer but lacks MR input | Not suitable for battery-backup RAM systems; requires external circuitry for manual reset and power-fail detection | Choose only if system uses 3.3V µP core and does not require BATT support or PFI monitoring |
Compared with MAX819LCTA+, the MAX819MCUA+T offers identical supervision logic in a µMAX package optimized for prototyping and low-volume assembly; versus TPS3808G33DBVR, it provides integrated battery management and manual reset - eliminating four external components in portable designs.
Availability
MAX819MCUA+T is available at Aetrix Electronics and suitable for portable medical monitors, industrial PLC I/O modules, smart energy meters, and point-of-sale terminals requiring stable component supply across extended production lifecycles.
Supply support for MAX819MCUA+T 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 power, sensing, and connectivity applications, with emphasis on reliability and integration density.
The MAX817/MAX818/MAX819 product line targets cost-sensitive, space-constrained µP systems needing robust power monitoring, battery backup, and fail-safe reset - especially in portable and industrial edge devices.
FAQ
What is the reset threshold voltage for MAX819MCUA+T?
The MAX819MCUA+T has a factory-trimmed reset threshold of 4.40V ±10%, specified for use in +5V systems where supply tolerance is ±10%. This value is fixed and cannot be adjusted externally. The threshold is guaranteed over the full operating temperature range (0°C to +70°C) and defines the VCC level below which the RESET output is asserted. It matches the "M" suffix designation in the MAX81x family nomenclature.
Does MAX819MCUA+T include a watchdog timer?
No, the MAX819MCUA+T does not include a watchdog timer. Per Maxim's Selector Guide and functional diagram, watchdog input (WDI) is not implemented on MAX819 variants - pin 6 is a no-connect. Watchdog functionality is exclusive to MAX817 and MAX818. The MAX819MCUA+T instead emphasizes manual reset (MR) and power-fail comparator (PFI/PFO) capabilities for deterministic system control.
How does the battery freshness seal work on MAX819MCUA+T?
The battery freshness seal on MAX819MCUA+T disconnects the BATT pin from internal circuitry until first use. To enable it: connect battery to BATT, ground PFO, bring VCC above 4.40V and hold until RESET deasserts (≥200ms), then lower VCC. MR must be high or open during this sequence. Once enabled, the seal remains active until VCC exceeds VRST again, preserving battery shelf life for up to 10 years.
Can MAX819MCUA+T monitor a 3.3V supply using the PFI input?
Yes, MAX819MCUA+T can monitor a 3.3V supply via the PFI input using a resistive divider. Since PFI compares against a fixed 1.25V internal reference, setting R1/R2 to achieve 1.25V at PFI when the monitored supply reaches its trip point (e.g., 3.0V) enables precise undervoltage detection. The PFI input draws only ±25nA, introducing negligible loading error - confirmed in Electrical Characteristics Table.
What is the maximum continuous current supported by the OUT pin of MAX819MCUA+T?
The OUT pin of MAX819MCUA+T supports up to 250mA continuous output current, as specified in Absolute Maximum Ratings. In practice, thermal limits constrain sustained current: the µMAX package dissipates 330mW at +70°C ambient, limiting usable current to ~150mA with adequate PCB copper pour. For higher loads, external buffering or discrete MOSFET switching is recommended to avoid junction overheating.
MAX819MCUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- Output:
- -
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX819MCUA+T FAQ
1.How can I place an order for MAX819MCUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX819MCUA+T 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 MAX819MCUA+T reliable?
The price and inventory of MAX819MCUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX819MCUA+T is usually 5 days.
3.What payment methods are accepted for MAX819MCUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX819MCUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX819MCUA+T?
MAX819MCUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX819MCUA+T 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 MAX819MCUA+T?
For technical support, including MAX819MCUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX819MCUA+T requirements.
6.How does Aetrix verify that MAX819MCUA+T is sourced from the original manufacturer or authorized distributors?
All MAX819MCUA+T 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 MAX819MCUA+T meets industry standards.
7.What is the process for return or replacement of MAX819MCUA+T?
All MAX819MCUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX819MCUA+T, 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 MAX819MCUA+T part is unused and in its original packaging.
Return procedure for MAX819MCUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX819MCUA+T Tags
-
MIC826SYMT-TR
Microchip Technology
-
APX803S-31SA-7
Diodes Incorporated
-
APX803L20-29SA-7
Diodes Incorporated
-
TPS3828-33DBVR
Texas Instruments
-
V6340RSP3B+
EM Microelectronic
-
EM6325CXSP5B-2.9+
EM Microelectronic
-
MCP120T-300I/TT
Microchip Technology
-
MCP130T-315I/TT
Microchip Technology
-
MCP120T-475I/TT
Microchip Technology
-
MCP111T-300E/TT
Microchip Technology
-
MCP120T-315I/TT
Microchip Technology
-
MCP809T-315I/TT
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
