My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX806TCPA+
- Part No.:
- MAX806TCPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX806TCPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,154
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX806TCPA+ from Maxim Integrated is a 3.3V microprocessor supervisory circuit with active-high open-drain RESET output, 3.075V reset threshold (T-suffix), 200ms reset timeout, watchdog timer (1.6s), and battery-backup switchover. It monitors VCC supply integrity, asserts reset during brownout or watchdog timeout, and powers CMOS RAM from VBATT when VCC drops below 2.40V-used in portable embedded controllers requiring reliable power-fail detection and nonvolatile memory retention.
For engineers reviewing the MAX806TCPA+ datasheet, MAX806TCPA+ pinout, MAX806TCPA+ application, or MAX806TCPA+ equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in battery-backed systems, and two validated alternative parts with documented functional differences for design-in decisions.
Technical Context
The MAX806TCPA+ integrates a precision reset comparator with ±2% threshold tolerance (3.075V nominal), a 1.6s watchdog timer that clears on WDI edge transitions, and a dual-path power switch: VCC-to-VOUT via 3Ω PMOS and VBATT-to-VOUT via 140Ω NMOS. Its PFI input accepts external voltage dividers for auxiliary supply monitoring, while PFO provides an open-drain power-fail warning signal.
It operates across 0°C to +70°C, supports VCC from 3.17V to 5.5V and VBATT up to 6.0V, guarantees RESET assertion down to VCC = 1V, and draws only 40µA typical VCC supply current. Battery leakage is limited to 0.01–0.5µA, enabling multi-year backup operation with lithium coin cells.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V ±2% (VCC falling); ensures reset triggers before 3.3V supply drops below system minimum operating voltage |
| Reset Timeout | 200ms ±40ms; holds µP in reset long enough for power stabilization and clock lock after brownout recovery |
| Watchdog Timeout | 1.6s ±0.48s; detects µP firmware hangs without requiring external timing components |
| VCC Supply Current | 40µA typical at VCC < 3.6V; enables low-power operation in always-on battery-backed systems |
| Battery Leakage | 0.01–0.5µA; preserves CR2032 battery life beyond 10 years in standby mode |
| VBATT Switch Threshold | VSW = 2.40V (typ); initiates battery switchover early enough to maintain >2.0V on VOUT for CMOS RAM retention |
| PFI Threshold | 1.237V ±25mV; allows accurate monitoring of secondary supplies via resistor divider without calibration |
Pinout & Package
MAX806TCPA+ is housed in an 8-pin plastic DIP (PDIP) package with 0.300" wide body and through-hole mounting. Pin spacing is 0.100", lead finish is lead-free (RoHS-compliant), and thermal resistance is 9.09mW/°C above +70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC (via 3Ω PMOS) and VBATT (via 140Ω NMOS) based on VCC/VBATT comparison; must be decoupled with 0.1µF capacitor |
| 2 - VCC | Main system supply input | Accepts 3.17V–5.5V; powers internal circuitry and sources VOUT when above VSW; absolute max = +6.0V |
| 3 - GND | Ground reference | Common return for all analog/digital functions; substrate tied to higher of VCC or VBATT |
| 4 - PFI | Power-fail input | Compares external voltage to 1.237V reference; asserts PFO low if input falls below threshold or VCC drops below VSW |
| 5 - PFO | Power-fail open-drain output | Active-low signal indicating supply undervoltage or VCC < VSW; can drive MR input on MAX704/MAX806 to trigger reset |
| 6 - WDI | Watchdog input | Edge-sensitive (rising/falling); resets internal 1.6s timer on transition; tied high/low causes periodic reset |
| 7 - RESET | Active-high open-drain reset output | Inverse of MAX690/MAX704 RESET; requires external pull-up to VCC; sinks 1.2mA min when asserted |
| 8 - VBATT | Backup battery input | Accepts 3.6V lithium cell; may exceed VCC; connects to VOUT when VCC < VSW; absolute max = +6.0V |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures fail-safe reset even during deep brownout, preventing µP execution from corrupted memory |
| ±2% reset threshold tolerance | Tighter than MAX690/MAX704 (±4%), enabling robust operation in 3.3V ±5% systems without margin loss |
| Battery switchover with 2.40V VSW | Triggers backup before VOUT falls below 2.0V, preserving data in standard CMOS RAM without external logic |
| 40µA VCC supply current | Reduces system quiescent power by >50% vs. legacy supervisors, critical for long-life portable designs |
| 1.237V PFI reference with 10mV hysteresis | Enables precise, noise-immune monitoring of auxiliary rails (e.g., 5V, 12V) using simple resistor dividers |
Applications
| Battery-Powered Embedded Controller | Intelligent Portable Instrument |
|---|---|
Use Scenario: Handheld meter with real-time clock and SRAM storing calibration data, powered by single-cell Li-ion (3.0–4.2V). IC Role / Device Role / Timing Role: Supervises main 3.3V LDO output, asserts RESET during battery discharge below 3.1V, switches VOUT to VBATT at 2.4V to retain RAM contents. Use Value: Eliminates need for discrete reset IC + power-switch MOSFET + voltage divider, reducing BOM count by 4 components and PCB area by 25mm². |
Use Scenario: Portable gas analyzer with µP, sensor interface, and flash memory, operating on AA alkaline batteries (1.8–3.2V). IC Role / Device Role / Timing Role: Monitors 3.3V rail derived from boost converter; uses PFI to detect 5V sensor supply dropout; triggers watchdog if µP fails to service WDI. Use Value: Provides coordinated power-fail response (PFO→MR) and firmware hang recovery (WDI→RESET) in one 8-pin IC, cutting debug time by 70% vs. discrete solutions. |
| Critical µP Power Monitoring | Industrial Data Logger |
Use Scenario: Remote telemetry node with ARM Cortex-M0, GPS module, and cellular modem, powered by solar-charged LiFePO₄ (2.8–3.6V). IC Role / Device Role / Timing Role: Guarantees RESET remains asserted until VCC stabilizes >3.075V post-power-up; prevents boot corruption during intermittent solar charging. Use Value: ±2% reset accuracy ensures reliable startup across full battery voltage range, avoiding field failures seen with ±4% parts in marginal conditions. |
Use Scenario: Environmental logger recording temperature/humidity every 10s, powered by CR2032 coin cell (2.0–3.3V) with supercap backup. IC Role / Device Role / Timing Role: Uses VBATT switchover to extend backup runtime; leverages 0.5µA battery leakage spec to achieve 12-year shelf life. Use Value: Enables 10-year maintenance-free operation without battery replacement, meeting IEC 60747-17 long-life requirements for industrial IoT nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX802TCPA+ | Active-low RESET output (not open-drain); identical reset threshold, watchdog, and switchover specs | Requires external pull-up for µP reset input expecting active-high signal; incompatible with bidirectional reset pins without series resistor | Select MAX802TCPA+ only if target µP accepts active-low reset and board layout already includes pull-up resistor |
| MAX706TCSA+ | No battery switchover or VBATT pin; adds PFI hysteresis control pin; 1.25V PFI threshold | Cannot support RAM backup; suited for systems with stable primary supply but needing auxiliary rail monitoring and adjustable hysteresis | Choose MAX706TCSA+ when battery backup is unnecessary and precise PFI hysteresis tuning is required for noisy supply lines |
Compared with MAX802TCPA+, MAX806TCPA+ provides native active-high reset compatibility and eliminates external pull-up components, while MAX706TCSA+ trades battery support for enhanced PFI flexibility-making MAX806TCPA+ optimal for cost-sensitive, space-constrained battery-backed µP systems.
Availability
MAX806TCPA+ is available at Aetrix Electronics and suitable for battery-powered computers and controllers, intelligent instruments, and critical µP power monitoring applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MAX806TCPA+ 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, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The MAX806TCPA+ belongs to Maxim's 3.0V/3.3V microprocessor supervisory family, engineered specifically for reliable power monitoring, watchdog supervision, and seamless battery backup in portable and embedded systems with stringent low-power and long-life requirements.
FAQ
What is the function of the WDI pin on the MAX806TCPA+?
The WDI (Watchdog Input) pin on the MAX806TCPA+ monitors µP activity by requiring a rising or falling edge at least every 1.6 seconds. If no transition occurs, the internal watchdog timer expires and triggers a reset pulse. The timer clears immediately on any WDI edge or during RESET assertion, and cannot be disabled-ensuring continuous firmware health monitoring in safety-critical applications using the MAX806TCPA+.
Can the MAX806TCPA+ operate without a backup battery connected?
Yes, the MAX806TCPA+ can operate without a backup battery: connect both VBATT and VOUT pins directly to VCC. This disables battery switchover but retains all other functions-reset supervision, watchdog, and power-fail detection. However, RAM backup capability is lost, so this configuration is only suitable for systems where nonvolatile memory retention during power loss is not required when using the MAX806TCPA+.
What is the maximum allowable voltage on the VBATT pin of the MAX806TCPA+?
The absolute maximum rating for the VBATT pin on the MAX806TCPA+ is +6.0V. The device is designed to accept standard 3.6V lithium batteries, and VBATT may safely exceed VCC during normal operation. Exceeding +6.0V risks permanent damage to the internal battery switchover MOSFET and must be avoided in all designs using the MAX806TCPA+.
How does the MAX806TCPA+ handle power-fail detection for a 5V auxiliary supply?
The MAX806TCPA+ handles 5V auxiliary supply monitoring via its PFI pin using a resistor voltage divider. With a 1.237V internal reference, a 2.0:1 divider (e.g., 20kΩ/10kΩ) scales 5V to 1.67V, allowing detection of drops below ~4.1V. PFO asserts low when the divided voltage falls below 1.237V, enabling interrupt generation or MR-driven reset-providing flexible, calibrated power-fail response without additional ICs in the MAX806TCPA+ system.
Is the MAX806TCPA+ pin-compatible with the MAX690T series?
No, the MAX806TCPA+ is not pin-compatible with the MAX690T series. While both are 8-pin DIP supervisory circuits, MAX690T features active-low RESET (pin 7) and no WDI pin (pin 6 is unused), whereas MAX806TCPA+ has WDI on pin 6 and active-high open-drain RESET on pin 7. Swapping them requires PCB layout changes and firmware adjustments to accommodate the different reset polarity and watchdog functionality in the MAX806TCPA+.
MAX806TCPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX806TCPA+ FAQ
1.How can I place an order for MAX806TCPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX806TCPA+ 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 MAX806TCPA+ reliable?
The price and inventory of MAX806TCPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX806TCPA+ is usually 5 days.
3.What payment methods are accepted for MAX806TCPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX806TCPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX806TCPA+?
MAX806TCPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX806TCPA+ 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 MAX806TCPA+?
For technical support, including MAX806TCPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX806TCPA+ requirements.
6.How does Aetrix verify that MAX806TCPA+ is sourced from the original manufacturer or authorized distributors?
All MAX806TCPA+ 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 MAX806TCPA+ meets industry standards.
7.What is the process for return or replacement of MAX806TCPA+?
All MAX806TCPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX806TCPA+, 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 MAX806TCPA+ part is unused and in its original packaging.
Return procedure for MAX806TCPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX806TCPA+ 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…
