My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX815KESA+T
- Part No.:
- MAX815KESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX815KESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,649
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX815KESA+T from Maxim Integrated is a high-accuracy, low-power microprocessor supervisory circuit with integrated watchdog timer, power-fail monitor, and active-low reset output. It features ±1% worst-case reset threshold accuracy (4.80V), 200ms reset timeout, 75µA max supply current, and guaranteed RESET validity down to VCC = 1V. It is used in portable medical instruments and battery-powered controllers requiring reliable brownout detection and autonomous watchdog recovery.
For engineers reviewing the MAX815KESA+T datasheet, MAX815KESA+T pinout, MAX815KESA+T application, or MAX815KESA+T equivalent, this page delivers verified functional identity, confirmed pin roles for SO-8 package, exact reset/watchdog/power-fail timing values, and two validated alternative parts with documented technical and application differences.
Technical Context
The MAX815KESA+T implements a dedicated watchdog timer with 1.56s timeout, independent of the reset comparator - it triggers WDO low on WDI inactivity exceeding that period. Its reset generator asserts active-low RESET for ≥200ms after VCC rises above 4.80V ±1%, and holds RESET low during brownouts until VCC recovers and the timer expires.
Power-fail monitoring uses a separate 2.50V comparator on PFI (with 2.50V reference for K-suffix parts), driving open-drain PFO low when input falls below threshold. The manual reset input (MR) has internal 150µA pullup and triggers immediate reset assertion with 200ms minimum pulse width upon release.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.80V ±1% - ensures reset assertion before critical +5V µP operating voltage drops below 4.75V worst case |
| Watchdog Timeout | 1.56s - provides sufficient window for firmware sanity checks without false triggers in typical embedded loops |
| Reset Pulse Width | 200ms min - guarantees µP initialization completes before release, meeting Intel 80x86 and ARM Cortex boot requirements |
| Supply Current | 75µA max - enables multi-year operation in coin-cell–powered portable diagnostics and sensor nodes |
| Operating Voltage Range | 1.0V to 5.5V - supports valid RESET assertion during deep brownout, down to single-cell Li-ion discharge endpoint |
| Power-Fail Reference | 2.50V - matches standard +5V rail monitoring via resistive divider; enables early warning at ~11V for +12V supplies |
| MR Input Threshold | 1.10V max low / 0.7×VCC min high - compatible with TTL and CMOS logic levels across full VCC range |
Pinout & Package
MAX815KESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (+T suffix), with 1.27mm pitch and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - MR | Manual Reset Input | Active-low trigger with internal 150µA pullup; initiates immediate reset and holds ≥200ms after release |
| 2 - VCC | Positive Supply Input | Primary power source; reset asserted when VCC < 4.80V; RESET valid down to 1.0V |
| 3 - GND | Ground Reference | Common return for all analog comparators, digital outputs, and internal bias networks |
| 4 - PFI | Power-Fail Input | Monitors external voltage via resistor divider; referenced to 2.50V for K-suffix parts |
| 5 - PFO | Power-Fail Output | Open-drain output sinking ≥1.2mA; asserts low when PFI < 2.50V for early shutdown signaling |
| 6 - WDI | Watchdog Input | CMOS-compatible input; transition resets 1.56s timer; static high/low for >1.56s forces WDO low |
| 7 - RESET | Reset Output | Active-low, push-pull output; sinks ≥3.2mA at 0.4V; meets µP reset input VIH/VIL thresholds |
| 8 - WDO | Watchdog Output | Active-low, push-pull output; goes low on watchdog timeout or VCC reset condition; no minimum pulse width |
Key Features
| Feature | Design Value |
|---|---|
| ±1% worst-case reset threshold accuracy | Eliminates manual trimming and ensures deterministic reset across temperature, line, and load variations in safety-critical systems |
| Independent watchdog with 1.56s timeout | Enables robust firmware supervision without coupling to power-rail behavior - continues monitoring even during VCC brownout |
| Guaranteed RESET validity to VCC = 1V | Prevents undefined µP state during deep discharge; supports graceful shutdown in battery-backed medical telemetry |
| Power-supply glitch immunity | Rejects transients ≤30µs at 100mV overdrive, preventing spurious resets in electrically noisy industrial environments |
| 2.50V PFI reference (K-suffix) | Enables precise +5V rail monitoring and scalable early-warning design for +12V supplies using standard resistor ratios |
Applications
| Medical Diagnostic Handhelds | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Portable ultrasound or glucose meter operating from single Li-ion cell with dynamic load switching. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, watchdog recovery, and early power-fail interrupt via PFO. Use Value: Ensures deterministic µP restart during battery sag; 75µA quiescent current extends field-use runtime by >18 months. |
Use Scenario: Remote environmental sensor node logging temperature/humidity every 10 minutes using intermittent GSM transmission. IC Role / Device Role / Timing Role: Power supervisor asserting RESET on VCC dropout and triggering orderly data save via PFO interrupt before shutdown. Use Value: 200ms reset pulse guarantees EEPROM write completion; 1.56s watchdog prevents firmware lockup during RF burst transmission. |
| Industrial PLC I/O Modules | Set-Top Box Power Management |
Use Scenario: DIN-rail mounted controller with isolated +5V and +24V rails, subject to EFT and surge events. IC Role / Device Role / Timing Role: Fault-tolerant reset generator immune to 30µs VCC glitches, with MR for field service reset. Use Value: ±1% reset accuracy prevents premature reset during nominal 5.0V ±5% supply tolerance; MR debounced internally. |
Use Scenario: Consumer STB with dual-rail power (5V standby, 12V main) and fast wake/sleep transitions. IC Role / Device Role / Timing Role: Dual-voltage supervisor using PFI to monitor +12V rail and assert RESET if main supply collapses during channel change. Use Value: 2.50V PFI reference enables accurate +12V trip point (~11.0V) using 340kΩ/100kΩ divider; eliminates external comparator. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814KESA+T | No watchdog circuit; includes LOW LINE output instead of WDO/WDI; identical 4.80V reset and PFI/PFO functions | Suitable where early low-line warning (NMI) is required but autonomous watchdog recovery is not needed | Select MAX814KESA+T when system relies on software-based fault detection and only requires power-rail monitoring and reset |
| TPS3808G18DBVR | Fixed 1.8V reset threshold; no power-fail comparator; 300ms reset delay; 2.5µA typical IQ; SOT-23-6 package | Targeted at ultra-low-power 1.8V/3.3V logic domains; lacks PFI/PFO and watchdog - requires external circuitry for early warning | Choose TPS3808G18DBVR only for simple 1.8V µP reset in space-constrained, sub-µA standby designs - not a functional substitute for MAX815KESA+T |
Compared with MAX814KESA+T, MAX815KESA+T adds autonomous watchdog recovery at the cost of losing LOW LINE; compared with TPS3808G18DBVR, it provides full +5V supervision with integrated power-fail warning and watchdog - making it suitable for complex, safety-aware embedded systems where reliability trumps minimal footprint.
Availability
MAX815KESA+T is available at Aetrix Electronics and suitable for medical diagnostics, industrial control modules, and battery-powered data loggers requiring stable component supply across extended product lifecycles.
Supply support for MAX815KESA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for demanding industrial, medical, and communications applications.
The MAX814/MAX815/MAX816 family was designed specifically for microprocessor-based systems needing guaranteed reset behavior, early power-fail warning, and autonomous watchdog supervision - targeting portable, battery-operated, and safety-critical equipment.
FAQ
What is the reset threshold voltage of the MAX815KESA+T?
The MAX815KESA+T has a factory-trimmed reset threshold of 4.80V ±1%, specified over the full commercial temperature range (0°C to +70°C). This value is fixed and determined by the 'K' suffix per Maxim's ordering convention. The threshold remains stable across voltage, temperature, and time - enabling reliable reset assertion before +5V µPs drop below their minimum operating voltage of 4.75V.
Does the MAX815KESA+T include a watchdog timer, and how does it operate?
Yes, the MAX815KESA+T integrates a dedicated watchdog timer with a nominal timeout period of 1.56 seconds. It monitors the WDI pin: any absence of transitions (high-to-low or low-to-high) for longer than 1.56s causes WDO to go low. The timer resets on each WDI edge. Unlike the reset generator, the watchdog operates independently of VCC level - it remains functional even during brownout conditions as long as VCC stays above 1.0V.
What is the function of the PFI and PFO pins on the MAX815KESA+T?
On the MAX815KESA+T, PFI (Power-Fail Input) accepts a divided-down version of a monitored supply rail, comparing it against an internal 2.50V reference (K-suffix). When the PFI voltage falls below 2.50V, PFO (Power-Fail Output) pulls low, sinking ≥1.2mA. This provides an early warning signal - typically routed to a µP interrupt - allowing time to save data or initiate controlled shutdown before VCC crosses the 4.80V reset threshold.
Can the MAX815KESA+T be used with a 3.3V supply, and what are the limitations?
Yes, the MAX815KESA+T operates from 1.0V to 5.5V, so it functions with 3.3V VCC. However, its 4.80V reset threshold means it will *not* assert RESET based on VCC alone in a 3.3V system - VCC never reaches 4.80V. To use it in 3.3V applications, connect PFI to a resistor divider from the 3.3V rail and configure PFO to trigger reset via MR, or use it solely for watchdog supervision while relying on another supervisor for 3.3V reset.
What package type and compliance does the MAX815KESA+T use?
The MAX815KESA+T is supplied in an 8-pin SO (Small Outline) package, compliant with JEDEC MS-012AC dimensions. The '+T' suffix confirms lead-free (RoHS-compliant) construction with matte tin plating. It features 1.27mm lead pitch, gull-wing leads, and is rated for surface-mount reflow assembly per J-STD-020 moisture sensitivity level 1.
MAX815KESA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.8V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX815KESA+T FAQ
1.How can I place an order for MAX815KESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX815KESA+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 MAX815KESA+T reliable?
The price and inventory of MAX815KESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX815KESA+T is usually 5 days.
3.What payment methods are accepted for MAX815KESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX815KESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX815KESA+T?
MAX815KESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX815KESA+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 MAX815KESA+T?
For technical support, including MAX815KESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX815KESA+T requirements.
6.How does Aetrix verify that MAX815KESA+T is sourced from the original manufacturer or authorized distributors?
All MAX815KESA+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 MAX815KESA+T meets industry standards.
7.What is the process for return or replacement of MAX815KESA+T?
All MAX815KESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX815KESA+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 MAX815KESA+T part is unused and in its original packaging.
Return procedure for MAX815KESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX815KESA+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…
