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Analog Devices Inc./Maxim Integrated MAX804TCSA
- Part No.:
- MAX804TCSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX804TCSA.pdf
- Description:
- IC SUPERVISOR MPU
- Quantity:
- Payment:
- Shipping:
Inventory:634
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Product details
Overview
MAX804TCSA from Maxim Integrated is a 3.3V microprocessor supervisory circuit with active-high open-drain RESET output, 3.075V reset threshold, 200ms reset timeout, 1.6s watchdog timer, and battery-backup switchover for CMOS RAM retention. It monitors VCC, accepts manual reset (MR), detects power-fail via PFI/PFO, and operates in systems powered by 3.0V or 3.3V supplies.
For engineers reviewing the MAX804TCSA datasheet, MAX804TCSA pinout, MAX804TCSA application, or MAX804TCSA equivalent, this page delivers verified functional identity, confirmed pin roles, exact reset and watchdog timing, battery-switching behavior under brownout, and real-world design implications for embedded controllers and portable equipment.
Technical Context
The MAX804TCSA integrates a precision reset comparator with ±2% threshold tolerance (3.075V nominal), a non-disableable 1.6s watchdog timer cleared on WDI edge transitions, and a dual-path power switch that connects VOUT to VCC above VSW (2.40V) and to VBATT below it-enabling seamless RAM backup during brownout. Its PFI input features 1.237V threshold with 10mV hysteresis for reliable power-fail detection.
It implements an active-high open-drain RESET output (inverse of MAX690/704/802 families), guaranteed valid down to VCC = 1V, with VOL ≤ 0.3V at 1.2mA sink current. The device draws only 40µA from VCC and 1µA from VBATT in normal operation, supporting long-life battery-backed applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V (±2%) - ensures reset assertion before 3.3V supply drops below system stability margin. |
| Reset Timeout Period | 200ms (140–280ms over temp) - guarantees sufficient processor initialization time after power-up or recovery. |
| Watchdog Timeout | 1.6s (1.12–2.24s over temp) - provides robust firmware hang detection without false triggers from transient noise. |
| VCC Supply Current | 40µA typical (VCC < 3.6V) - enables ultra-low-power operation in always-on battery-backed systems. |
| Battery Supply Current | 1µA max - minimizes drain on lithium coin cells during extended backup periods. |
| RESET Output Type | Active-high, open-drain - allows wired-OR configuration and level-shifting with external pull-up. |
| Power-Fail Threshold | 1.237V (±20mV) on PFI - supports accurate undervoltage monitoring of auxiliary rails via resistor divider. |
Pinout & Package
MAX804TCSA is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package, surface-mount compatible, RoHS-compliant (lead-free), with standard 1.27mm pitch and JEDEC MS-012 outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC and VBATT based on voltage comparison; connects to RAM VDD for data retention during brownout. |
| 2 - VCC | Main system supply input | Primary 3.0V/3.3V power source; powers internal circuitry and determines reset assertion point. |
| 3 - GND | Ground reference | Common return path for all analog and digital functions; must be low-impedance for stable reset timing. |
| 4 - PFI | Power-fail input | Monitors auxiliary supply via external divider; asserts PFO low when voltage falls below 1.237V. |
| 5 - PFO | Power-fail output | Open-drain signal indicating undervoltage condition; can drive MR on compatible supervisors. |
| 6 - WDI | Watchdog input | Edge-sensitive trigger; reset occurs if no transition occurs within 1.6s - prevents firmware lockup. |
| 7 - RESET | Active-high reset output | Open-drain output asserted high during reset; requires external pull-up to VCC or another rail. |
| 8 - VBATT | Backup battery input | Accepts 3.6V lithium cell; automatically powers VOUT when VCC drops below 2.40V, even if VBATT > VCC. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1V | Ensures reliable reset initiation even during deep brownout, critical for fail-safe embedded boot sequences. |
| Battery-backup switchover with 2.40V threshold | Enables early transition to backup power before VOUT falls below 2.0V RAM retention limit, maximizing data hold time. |
| Non-disableable watchdog timer | Eliminates risk of accidental watchdog disable in firmware, enforcing mandatory periodic health checks. |
| 1µA VBATT supply current | Extends shelf life of primary lithium batteries beyond 10 years in storage-mode applications. |
| ±2% reset threshold accuracy | Reduces need for external calibration and supports tighter system-level voltage margining than ±4% alternatives. |
Applications
| Battery-Powered Embedded Controller | Portable Medical Instrument |
|---|---|
Use Scenario: A handheld glucose meter uses a 3.3V MCU and CR2032 coin cell for memory retention during battery replacement. IC Role / Device Role / Timing Role: MAX804TCSA monitors main supply, asserts RESET on brownout, switches VOUT to VBATT, and triggers watchdog if firmware hangs. Use Value: Prevents corrupted EEPROM writes during power interruption and ensures deterministic restart after battery swap. |
Use Scenario: An ECG monitor with flash memory and real-time clock requires uninterrupted power during AC adapter disconnection. IC Role / Device Role / Timing Role: MAX804TCSA acts as power supervisor and RAM keeper, using PFI to monitor auxiliary 5V rail and PFO to flag low-voltage events. Use Value: Guarantees 200ms minimum reset pulse and seamless switchover to 3.6V lithium backup, preserving patient data integrity. |
| Industrial Data Logger | Smart Sensor Node |
Use Scenario: A remote environmental logger runs on Li-SOCl₂ primary battery and must retain sensor calibration data across multi-year deployments. IC Role / Device Role / Timing Role: MAX804TCSA provides low-current supervision (40µA VCC / 1µA VBATT), monitors VCC for brownout, and manages RAM backup via VBATT. Use Value: Enables >10-year battery life in sleep mode while ensuring reliable wake-up and reset sequencing upon power restoration. |
Use Scenario: A Zigbee-enabled temperature node uses a 3.3V MCU and supercapacitor backup; VCC may dip during RF transmission bursts. IC Role / Device Role / Timing Role: MAX804TCSA detects sub-3.075V dips with 200ms timeout, asserts RESET to halt transmission, and switches VOUT to supercap during transient sag. Use Value: Prevents MCU crash during RF load transients and maintains SRAM state without requiring external power-path FETs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX804TSA | Same functionality and pinout, but in standard SOIC (no 'C' suffix = commercial temp range only: 0°C to +70°C). | Not rated for extended industrial temperature range (-40°C to +85°C) like MAX804TCSA. | Select MAX804TSA only for cost-sensitive consumer-grade designs operating within 0°C–70°C ambient. |
| MAX805TCSA | Identical package and temperature grade, but features active-low RESET (push-pull) instead of active-high open-drain. | Requires different reset logic polarity handling and lacks wired-OR capability of open-drain output. | Choose MAX805TCSA when interfacing with MCUs requiring active-low reset assertion or when external pull-up is undesirable. |
Compared with MAX804TCSA, MAX804TSA sacrifices industrial temperature support for lower cost, while MAX805TCSA changes reset polarity and drive architecture-both require schematic review for compatibility with existing reset signaling and power-domain isolation requirements.
Availability
MAX804TCSA is available at Aetrix Electronics and suitable for battery-powered computers and controllers, embedded controllers, and intelligent instruments requiring stable component supply with guaranteed long-term availability and traceable sourcing.
Supply support for MAX804TCSA 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 industrial, communications, and computing markets.
The MAX804TCSA belongs to Maxim's 3.0V/3.3V microprocessor supervisory family, designed specifically to replace discrete reset and battery-switch circuits in space-constrained, low-power embedded systems requiring high reliability and precise voltage monitoring.
FAQ
What is the reset threshold voltage of the MAX804TCSA?
The MAX804TCSA has a nominal reset threshold voltage of 3.075V, with ±2% tolerance over temperature. This value is specified for VCC falling conditions and ensures reset assertion before the 3.3V supply drops below the system's operational margin. The threshold is factory-trimmed and does not require external components for accuracy.
Does the MAX804TCSA support battery-backup switchover, and what is the switching threshold?
Yes, the MAX804TCSA supports automatic battery-backup switchover. It connects VOUT to VBATT when VCC falls below the battery switch threshold (VSW) of 2.40V (typical), provided VBATT exceeds VCC. This ensures CMOS RAM remains powered above its 2.0V retention limit, extending data hold time during brownout.
What type of RESET output does the MAX804TCSA provide, and how is it used?
The MAX804TCSA provides an active-high, open-drain RESET output. It requires an external pull-up resistor to VCC or another logic rail. This configuration enables wired-OR connection with other reset sources and supports level translation across different voltage domains in complex systems.
Can the watchdog timer in the MAX804TCSA be disabled?
No, the watchdog timer in the MAX804TCSA cannot be disabled. It is a fixed-function, non-disableable 1.6s timeout circuit that clears on any rising or falling edge at the WDI pin. This design enforces mandatory firmware health checking and eliminates risks associated with accidental watchdog disable in software.
What is the maximum supply current drawn by the MAX804TCSA from VCC and VBATT?
The MAX804TCSA draws a maximum of 50µA from VCC (at VCC < 3.6V, +70°C) and 1µA from VBATT under normal operating conditions. These ultra-low currents enable multi-year operation on primary lithium batteries and make the MAX804TCSA suitable for always-on, battery-backed applications.
MAX804TCSA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- Output:
- Open Drain, Open Drain
- Reset:
- Active High/Active Low
- Reset Timeout:
- 140ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX804TCSA FAQ
1.How can I place an order for MAX804TCSA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX804TCSA 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 MAX804TCSA reliable?
The price and inventory of MAX804TCSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX804TCSA is usually 5 days.
3.What payment methods are accepted for MAX804TCSA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX804TCSA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX804TCSA?
MAX804TCSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX804TCSA 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 MAX804TCSA?
For technical support, including MAX804TCSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX804TCSA requirements.
6.How does Aetrix verify that MAX804TCSA is sourced from the original manufacturer or authorized distributors?
All MAX804TCSA 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 MAX804TCSA meets industry standards.
7.What is the process for return or replacement of MAX804TCSA?
All MAX804TCSA units undergo pre-shipment inspection (PSI). If there is an issue with MAX804TCSA, 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 MAX804TCSA part is unused and in its original packaging.
Return procedure for MAX804TCSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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