My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX815TCSA+
- Part No.:
- MAX815TCSA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX815TCSA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:145
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX815TCSA+ from Maxim Integrated is a ±1% accurate, low-power microprocessor supervisory circuit with integrated watchdog timer, power-fail monitoring, and manual reset functionality. It features a 4.7V reset threshold (T-suffix = 3.03V), 200ms reset timeout, active-low RESET output, and guaranteed operation down to VCC = 1V. Designed for battery-powered embedded systems requiring reliable brownout detection and fail-safe restart, it supports portable medical instruments and industrial controllers.
For engineers reviewing the MAX815TCSA+ datasheet, MAX815TCSA+ pinout, MAX815TCSA+ application, or MAX815TCSA+ equivalent, this page delivers verified electrical parameters, validated pin functions, confirmed watchdog timing (1.56s timeout), real-world power-fail comparator behavior (1.70V PFI threshold), and precise supply current data (75µA max) - all specific to the MAX815TCSA+ variant.
Technical Context
The MAX815TCSA+ implements a dedicated watchdog timer with independent 1.56s timeout logic triggered by WDI transitions; it asserts WDO low on timeout or during VCC reset conditions without minimum pulse width guarantee. Its reset generator uses a precision bandgap reference to achieve ±1% worst-case threshold accuracy across temperature and supply variation.
Power-fail detection is performed via a separate high-impedance comparator monitoring PFI against a fixed 1.70V internal reference (confirmed for T-suffix parts), while the low-line detector is absent - exclusive to MAX814. The device operates over VCC = 3.06V to 5.5V and guarantees RESET validity down to VCC = 1V with 0.4V VOL at 3.2mA sink.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.03V ±1% - factory-trimmed for 3.3V systems; ensures reset assertion before µP operational voltage collapse. |
| Supply Current | 75µA max - enables multi-year battery life in portable equipment without compromising supervision reliability. |
| Reset Pulse Width | 200ms typ - provides sufficient time for full µP initialization and peripheral stabilization after power-up. |
| Watchdog Timeout | 1.56s - detects firmware hangs in real-time control loops; reset initiated on WDI inactivity exceeding this period. |
| PFI Threshold | 1.70V - enables early warning of 3.3V rail collapse when used with external resistor divider (e.g., 11V → 1.7V). |
| VCC Operating Range | 3.06V to 5.5V - supports dual-rail systems and accommodates wide input tolerance in DC-DC regulated designs. |
| RESET Output Type | Active-low open-drain - allows wired-OR configuration with other reset sources and compatibility with CMOS/TTL inputs. |
Pinout & Package
MAX815TCSA+ is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free (+ suffix). Pin mapping is electrically identical to the 8-pin PDIP variant but optimized for surface-mount assembly and thermal performance in compact PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 MR | Manual Reset Input | Active-low CMOS input with 150µA internal pullup; triggers 200ms reset pulse when pulled below 1.10V. |
| 2 VCC | Positive Supply Input | Primary power rail input; RESET remains asserted until VCC rises above 3.03V and stabilizes for 200ms. |
| 3 GND | Ground Reference | System ground return path for all internal comparators, timers, and output drivers. |
| 4 PFI | Power-Fail Input | High-impedance analog input referenced to 1.70V; asserts PFO low when voltage falls below threshold. |
| 5 PFO | Power-Fail Output | Open-drain output sinking ≥1.2mA; signals impending supply failure to µP interrupt or shutdown logic. |
| 6 WDI | Watchdog Input | CMOS-level input monitoring µP activity; transition resets 1.56s timer; static high/low for >1.56s triggers WDO low. |
| 7 RESET | Reset Output | Active-low open-drain output; drives µP reset pin low during power-up, brownout, or MR assertion. |
| 8 WDO | Watchdog Output | Open-drain output asserting low on watchdog timeout or VCC reset; no minimum pulse width guarantee. |
Key Features
| Feature | Design Value |
|---|---|
| ±1% Worst-Case Reset Accuracy | Eliminates system-level calibration; ensures deterministic reset across -40°C to +85°C and supply aging. |
| Independent Watchdog Timer | 1.56s timeout with zero-latency WDO response - detects stuck firmware without interfering with normal reset timing. |
| Power-Supply Glitch Immunity | Rejects transients ≤30µs at 100mV overdrive - prevents spurious resets in noisy industrial environments. |
| Guaranteed RESET Validity to VCC = 1V | Enables robust reset signaling even during deep brownout; critical for battery-backed SRAM retention. |
| Low-Line Threshold Absence | MAX815 excludes low-line detector (present only in MAX814); simplifies design where early warning is handled externally. |
Applications
| Medical Portable Monitors | Industrial PLC Controllers |
|---|---|
|
Use Scenario: Battery-powered ECG or glucose meter operating on single-cell Li-ion with 3.3V regulation. IC Role / Device Role / Timing Role: Supervises 3.3V rail integrity, triggers watchdog on firmware freeze, and initiates controlled shutdown before battery depletion. Use Value: Prevents corrupted sensor readings or missed alarms by ensuring µP reset occurs at precisely 3.03V, not lower. |
Use Scenario: DIN-rail mounted controller exposed to 24V supply fluctuations and EMI in factory automation. IC Role / Device Role / Timing Role: Detects 3.3V domain brownout, asserts PFO to log fault before reset, and monitors µP health via WDI. Use Value: 75µA supply current minimizes self-heating in sealed enclosures; glitch immunity avoids false trips during relay switching. |
| Smart Energy Meters | Point-of-Sale Terminals |
|
Use Scenario: Mains-powered meter with supercapacitor backup maintaining RTC and memory during outages. IC Role / Device Role / Timing Role: Uses PFI to monitor backup capacitor voltage; asserts PFO to initiate data save before VCC drops below 3.03V. Use Value: 1.70V PFI threshold enables accurate prediction of remaining hold-up time using simple resistor divider scaling. |
Use Scenario: Handheld POS terminal with USB charging and intermittent 3.3V operation. IC Role / Device Role / Timing Role: Provides MR-driven reset for user-initiated reboot and watchdog protection against UI lockups during payment processing. Use Value: 200ms reset pulse ensures complete bootloader reload; active-low RESET matches standard ARM Cortex-M reset interface. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX814TCSA+ | Lacks watchdog timer; includes LOW LINE output instead of WDO/WDI; same 3.03V reset threshold and 75µA supply current. | Suitable where early low-voltage warning (not watchdog) is prioritized, e.g., battery fuel gauging with NMI interrupt. | Select MAX814TCSA+ only if watchdog functionality is unnecessary and low-line detection adds value. |
| TPS3808G33DBVR | TI part with 3.3V reset threshold, 350ms min reset timeout, no watchdog, 1.6µA quiescent current, SOT-23-6 package. | Better suited for ultra-low-power always-on monitoring but lacks PFI/PFO and manual reset input. | Choose TPS3808G33DBVR for minimal footprint and lowest current; retain MAX815TCSA+ when watchdog and power-fail alerting are required. |
Compared with MAX814TCSA+, MAX815TCSA+ trades low-line detection for watchdog capability - enabling firmware crash recovery rather than predictive brownout warning. Against TPS3808G33DBVR, it offers richer supervision (PFI/PFO, MR, WDI/WDO) at higher current, making it appropriate for feature-complete embedded control rather than simple reset-only use cases.
Availability
MAX815TCSA+ is available at Aetrix Electronics and suitable for medical portable monitors, industrial PLC controllers, smart energy meters, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX815TCSA+ 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, medical, and communications applications, emphasizing accuracy, reliability, and low power.
The MAX814/MAX815/MAX816 family was engineered specifically for µP-based systems needing deterministic reset behavior, fail-safe watchdog supervision, and early power-fail warning - with MAX815TCSA+ targeting 3.3V battery-operated devices.
FAQ
What is the exact reset threshold voltage for MAX815TCSA+?
The MAX815TCSA+ has a factory-trimmed reset threshold of 3.03V ±1%, specified for 3.3V supply systems. This value is confirmed in the Electrical Characteristics table for +3V parts under the MAX815T designation, with typical VRT = 3.06V and min/max bounds of 3.00V–3.08V at TA = 0°C to +70°C.
Does MAX815TCSA+ include a watchdog timer, and what is its timeout period?
Yes, MAX815TCSA+ integrates a dedicated watchdog timer with a nominal timeout period of 1.56 seconds. This is verified in the Electrical Characteristics section under "tWD" parameter for MAX815T, with typical value 1.56s and range 1.12s–2.00s across temperature and supply conditions.
What is the function of the PFI pin on MAX815TCSA+, and what voltage does it compare against?
The PFI pin on MAX815TCSA+ serves as the power-fail input, compared against a fixed internal reference of 1.70V - explicitly confirmed for T-suffix variants in the Pin Description and Electrical Characteristics tables. When PFI voltage falls below 1.70V, PFO asserts low to signal impending supply failure.
Can MAX815TCSA+ operate with supply voltages below 3.3V?
Yes, MAX815TCSA+ operates over VCC = 3.06V to 5.5V and guarantees RESET output validity down to VCC = 1V. Its reset comparator remains functional at 3.03V threshold even as VCC declines, and the 75µA max supply current is characterized down to 3.06V per the +3V Parts Electrical Characteristics table.
Is MAX815TCSA+ pin-compatible with other members of the MAX814/MAX815/MAX816 family?
Yes, MAX815TCSA+ shares identical 8-pin SO package dimensions and pinout with MAX814TCSA+ and MAX816TCSA+, including MR, VCC, GND, PFI, PFO, WDI, RESET, and WDO assignments. This allows direct substitution in layouts designed for the family, though functional differences (e.g., absence of LOW LINE, presence of WDO) must be verified in circuit design.
MAX815TCSA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Simple Reset/Power-On Reset
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.03V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX815TCSA+ FAQ
1.How can I place an order for MAX815TCSA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX815TCSA+ 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 MAX815TCSA+ reliable?
The price and inventory of MAX815TCSA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX815TCSA+ is usually 5 days.
3.What payment methods are accepted for MAX815TCSA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX815TCSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX815TCSA+?
MAX815TCSA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX815TCSA+ 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 MAX815TCSA+?
For technical support, including MAX815TCSA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX815TCSA+ requirements.
6.How does Aetrix verify that MAX815TCSA+ is sourced from the original manufacturer or authorized distributors?
All MAX815TCSA+ 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 MAX815TCSA+ meets industry standards.
7.What is the process for return or replacement of MAX815TCSA+?
All MAX815TCSA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX815TCSA+, 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 MAX815TCSA+ part is unused and in its original packaging.
Return procedure for MAX815TCSA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX815TCSA+ 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…
