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Analog Devices Inc./Maxim Integrated MAX690TESA+
- Part No.:
- MAX690TESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX690TESA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,730
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Product details
Overview
MAX690TESA+ from Maxim Integrated is a 3.3V microprocessor supervisory circuit with active-low RESET output, 3.075V reset threshold (T-suffix), 200ms reset timeout, watchdog timer (1.6s), and battery-backup switchover-designed for reliable power monitoring in embedded controllers and battery-powered systems.
For engineers reviewing the MAX690TESA+ datasheet, MAX690TESA+ pinout, MAX690TESA+ application, or MAX690TESA+ equivalent, this page delivers verified specifications, package mapping, functional alternatives, and design-critical timing behavior for brownout recovery, RAM backup, and watchdog supervision in 3.0V/3.3V µP systems.
Technical Context
The MAX690TESA+ integrates a precision reset comparator with ±4% threshold tolerance, a dedicated power-fail comparator (VPFT = 1.237V, ±20mV hysteresis), and a non-disableable watchdog timer that triggers on WDI inactivity exceeding 1.6s. Its dual-supply architecture enables seamless VCC-to-VBATT switchover at VSW = 2.40V (typ) while supporting VBATT > VCC operation.
It features a 3Ω PMOS VCC-to-VOUT switch and a 140Ω VBATT-to-VOUT switch, guaranteed RESET assertion down to VCC = 1V, and operates across –40°C to +85°C. The device lacks short-circuit protection on VOUT and requires external 0.1µF decoupling on VCC and VBATT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 3.075V (VCC falling), ±4% tolerance - ensures reset assertion before 3.0V supply collapse in 3.3V ±5% systems |
| Reset Timeout Period | 200ms (typ), 140–280ms range - provides sufficient hold time for µP initialization after power stabilization |
| Watchdog Timeout | 1.6s (typ), 1.12–2.24s range - detects µP lockup without requiring software intervention |
| VCC Supply Current | 40µA (typ, VCC < 3.6V) - enables ultra-low-power operation in battery-backed standby mode |
| Battery Supply Current | 0.4–1µA (max, –40°C to +85°C) - minimizes drain on lithium backup cells during extended outages |
| Power-Fail Threshold | 1.237V (VPFT), ±20mV hysteresis - supports accurate undervoltage detection of auxiliary rails via external divider |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded environments with thermal cycling resilience |
Pinout & Package
MAX690TESA+ is housed in an 8-pin SOIC (SO) package with gull-wing leads, RoHS-compliant (indicated by '+' suffix), and footprint compatible with standard 8-SO land pattern 90-0096.
| 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 VSW; must be decoupled externally |
| 2 - VCC | Main system supply input | Accepts 1.0–5.5V; powers internal circuitry and drives VOUT when above reset threshold |
| 3 - GND | Analog/digital ground reference | Common return for all internal comparators, timers, and outputs; requires low-impedance PCB connection |
| 4 - PFI | Power-fail comparator input | Monitors auxiliary rail via external resistor divider; asserts PFO low when voltage falls below 1.237V |
| 5 - PFO | Power-fail open-drain output | Active-low signal indicating PFI undervoltage or VCC dropout; can drive MR on MAX704/MAX806 |
| 6 - WDI | Watchdog input | Rising/falling edge clears 1.6s timer; tie high/low to force periodic reset; no disable function |
| 7 - RESET | Active-low reset output | Push-pull, asserted low during brownout, watchdog timeout, or MR activation; guaranteed to VCC = 1V |
| 8 - VBATT | Backup battery input | Supports VBATT > VCC (e.g., 3.6V Li); connects to VOUT when VCC < VSW (2.40V) or < 1.75V |
Key Features
| Feature | Design Value |
|---|---|
| Battery-backup switchover | Automatic VCC-to-VBATT transition at 2.40V (VSW), preventing CMOS RAM data loss during brownout |
| Guaranteed RESET assertion | Valid down to VCC = 1V - ensures robust reset even under severe undervoltage conditions |
| Watchdog timer immunity | Non-disableable 1.6s timeout with edge-triggered clear - eliminates firmware dependency for lockup recovery |
| Low-quiescent current | 40µA VCC supply current (typ) and sub-1µA battery leakage - extends shelf life of battery-backed systems |
| Power-fail warning | Dedicated PFI/PFO pair with 1.237V threshold and 20mV hysteresis - enables independent auxiliary rail monitoring |
Applications
| Battery-Powered Embedded Controller | Critical µP Power Monitoring |
|---|---|
Use Scenario: Industrial sensor node operating on primary Li-ion cell with optional coin-cell backup during mains failure. IC Role / Device Role / Timing Role: Supervises 3.3V rail, asserts RESET on brownout, switches RAM to VBATT at 2.40V, and triggers watchdog if firmware hangs. Use Value: Prevents corrupted sensor readings and preserves RAM state for 72+ hours using 220mAh coin cell. |
Use Scenario: Medical infusion pump requiring fail-safe startup and continuous µP health verification. IC Role / Device Role / Timing Role: Generates 200ms power-on reset, monitors VCC for <3.075V dips, and resets µP within 1.6s if communication stalls. Use Value: Meets IEC 62304 Class C requirements for deterministic fault response and no single-point failure. |
| Intelligent Instrumentation | Portable Test Equipment |
Use Scenario: Handheld multimeter with EEPROM calibration storage and real-time clock powered by CR2032. IC Role / Device Role / Timing Role: Provides clean reset on battery insertion, maintains VOUT during battery swap, and warns of main supply collapse via PFO. Use Value: Enables hot-swap battery replacement without losing calibration data or RTC timekeeping. |
Use Scenario: Battery-operated oscilloscope front-end where µP controls ADC sampling and display refresh. IC Role / Device Role / Timing Role: Monitors 3.3V analog supply independently from digital rail, asserts RESET if analog VCC drops below 3.075V. Use Value: Prevents spurious ADC conversions and display artifacts caused by marginal analog supply. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX704TESA+ | Identical pinout and reset threshold; adds manual reset (MR) input with 70µA internal pull-up | Enables hardware-initiated reset via pushbutton; required where field service reset is mandated | Select MAX704TESA+ when manual reset functionality is needed without redesigning PCB layout |
| MAX802TESA+ | Tighter reset threshold tolerance (±2% vs. ±4%) and improved PFI accuracy (±2% vs. ±75mV) | Suitable for high-precision 3.3V systems with narrow supply margins (e.g., FPGA configuration rails) | Choose MAX802TESA+ for applications demanding tighter voltage monitoring, such as telecom line cards |
Compared with MAX690TESA+, MAX704TESA+ adds MR functionality without altering reset behavior or package, while MAX802TESA+ improves threshold accuracy at the cost of higher sensitivity to noise-making it preferable only where tighter tolerances justify added design validation effort.
Availability
MAX690TESA+ is available at Aetrix Electronics and suitable for battery-powered computers and controllers, embedded controllers, and intelligent instrumentation requiring stable component supply with industrial temperature support.
Supply support for MAX690TESA+ 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 MAX690 series belongs to Maxim's microprocessor supervisory product line, engineered specifically for reliable power sequencing, brownout protection, and battery-switchover in 3.0V/3.3V µP systems with minimal external components.
FAQ
What is the reset threshold voltage for MAX690TESA+?
The MAX690TESA+ has a nominal reset threshold voltage of 3.075V (VCC falling), with ±4% tolerance over temperature. This value is fixed by the 'T' suffix and ensures reset assertion before the 3.3V supply falls below 3.0V in systems with ±5% regulation tolerance. The rising threshold is 3.085V, providing 10mV hysteresis to prevent chatter during recovery.
Does MAX690TESA+ support battery-backup operation with VBATT higher than VCC?
Yes, MAX690TESA+ explicitly supports VBATT exceeding VCC-such as a 3.6V lithium cell on a 3.3V system. The internal battery switchover circuit activates when VCC falls below VSW = 2.40V (typ), connecting VBATT to VOUT through a 140Ω switch. This design preserves CMOS RAM data without requiring external diodes or regulators.
Can the watchdog timer in MAX690TESA+ be disabled?
No, the watchdog timer in MAX690TESA+ cannot be disabled. It is a hardwired feature that times out after 1.6 seconds (typ) if the WDI pin remains static. The timer clears only on a rising or falling edge at WDI or during RESET assertion. This ensures fail-safe µP supervision even if firmware fails to service the watchdog.
What is the maximum allowable VCC transient duration that will not trigger a false reset in MAX690TESA+?
For a 100mV overdrive (i.e., VCC dipping 100mV below the 3.075V reset threshold), MAX690TESA+ tolerates negative-going transients up to 40µs without issuing a reset pulse. This immunity is enhanced by a 0.1µF bypass capacitor placed near the VCC pin, which suppresses high-frequency noise that could otherwise cause spurious resets.
Is MAX690TESA+ pin-compatible with other devices in the MAX690 family?
Yes, MAX690TESA+ shares identical 8-pin SOIC pinout with all MAX690x variants (e.g., MAX690SEA+, MAX690REA+) and cross-family equivalents like MAX704TESA+ and MAX802TESA+. Pin functions-including VOUT, RESET, WDI, and VBATT-are fully aligned, enabling direct substitution where threshold voltage and feature set match system requirements.
MAX690TESA+ 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:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 3.075V
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 35ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MAX690TESA+ FAQ
1.How can I place an order for MAX690TESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX690TESA+ 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 MAX690TESA+ reliable?
The price and inventory of MAX690TESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX690TESA+ is usually 5 days.
3.What payment methods are accepted for MAX690TESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX690TESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX690TESA+?
MAX690TESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX690TESA+ 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 MAX690TESA+?
For technical support, including MAX690TESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX690TESA+ requirements.
6.How does Aetrix verify that MAX690TESA+ is sourced from the original manufacturer or authorized distributors?
All MAX690TESA+ 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 MAX690TESA+ meets industry standards.
7.What is the process for return or replacement of MAX690TESA+?
All MAX690TESA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX690TESA+, 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 MAX690TESA+ part is unused and in its original packaging.
Return procedure for MAX690TESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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