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Analog Devices Inc./Maxim Integrated MAX692AESA+T
- Part No.:
- MAX692AESA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MAX692AESA+T.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,199
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Product details
Overview
The MAX692AESA+T from Maxim Integrated is a microprocessor supervisory circuit providing precision reset generation, battery-backup switchover, watchdog timer, and power-fail detection for +5V systems. It asserts active-low RESET during power-up, brownout (VCC < 4.40V), and watchdog timeout (1.6s), delivers VOUT from VCC or VBATT with 5Ω/80Ω PMOS switches, and features 1.25V PFI comparator with ±2% accuracy for low-battery warning in industrial controllers.
For engineers reviewing the MAX692AESA+T datasheet, MAX692AESA+T pinout, MAX692AESA+T application, or MAX692AESA+T equivalent, key selection criteria include guaranteed RESET assertion down to VCC = 1.2V, 200μA quiescent supply current, 50nA battery-backup mode current, and compatibility with lithium backup batteries up to 4.55V.
Technical Context
The MAX692AESA+T integrates four independent functional blocks: a precision voltage monitor with 4.40V reset threshold and 40mV hysteresis, a 1.6s watchdog timer cleared by WDI edges or RESET assertion, a battery switchover circuit that connects VBATT to VOUT only when VCC falls below threshold and VBATT > VCC + 20mV, and a 1.25V reference-based power-fail comparator driving open-drain PFO.
Its internal architecture uses a substrate-connected design where VCC powers the IC during normal operation, while VBATT supplies only the backup path; the 80Ω PMOS switch enables sub-1μA current draw from VBATT when VCC < VBATT − 1V, and the PFI input draws ≤25nA to minimize divider error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V nominal (4.25V min, 4.50V max); triggers RESET when VCC drops below this level during brownout or power-down. |
| Reset Pulse Width | 200ms typical (140–280ms); ensures reliable μP initialization without requiring external timing components. |
| Watchdog Timeout | 1.60s nominal (1.00–2.25s); detects software lockup if WDI is not toggled within this window. |
| Quiescent Supply Current | 200–500μA over temperature; enables low-power operation in battery-backed embedded systems. |
| Battery-Backup Current | 5.0μA max over full temp range; preserves lithium battery life for multi-year RAM retention. |
| Power-Fail Accuracy | ±2% (guaranteed for MAX802M variant); supports precise undervoltage detection for regulated +5V supplies. |
| VOUT Output Impedance | 5Ω (VCC mode), 80Ω (VBATT mode); maintains stable CMOS RAM supply under load without external regulation. |
Pinout & Package
MAX692AESA+T is housed in an 8-pin SO (Small Outline) package, RoHS-compliant, with 1.27mm pitch and JEDEC MS-012AC outline. Pin 1 is VBATT, pin 2 is VCC, pin 3 is GND, pin 4 is PFI, pin 5 is PFO, pin 6 is WDI, pin 7 is RESET, and pin 8 is VOUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VBATT) | Backup battery input | Connects to lithium cell (2.8–4.55V); enables automatic switchover to backup power when VCC falls below 4.40V. |
| 2 (VCC) | +5V supply input | Powers internal circuitry; must be ≥1.2V for guaranteed RESET assertion; drives VOUT via 5Ω PMOS switch. |
| 3 (GND) | Ground reference | Common return for all analog and digital functions; requires low-impedance connection to system ground plane. |
| 4 (PFI) | Power-fail comparator input | Monitors external voltage divider; asserts PFO low when input falls below 1.25V ±2%, enabling early power-fail warning. |
| 5 (PFO) | Power-fail open-drain output | Sinks up to 3.2mA; signals μP interrupt on supply degradation; disabled during battery-backup mode. |
| 6 (WDI) | Watchdog input | Edge-sensitive; clears internal 1.6s timer on rising/falling transitions; floating or high-Z disables watchdog function. |
| 7 (RESET) | Active-low reset output | Drives μP reset pin low for 200ms; guaranteed logic low down to VCC = 1.2V; compatible with Intel 80C51-style inputs. |
| 8 (VOUT) | CMOS RAM supply output | Delivers regulated VCC or VBATT to RAM; includes built-in switchover hysteresis (40mV) to prevent oscillation during slow VCC decay. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed RESET assertion to VCC = 1.2V | Ensures deterministic reset behavior even during deep brownout conditions common in industrial power rails. |
| 40mV reset threshold hysteresis | Prevents repeated RESET toggling during slow VCC ramp-down, eliminating spurious reboots in marginally powered systems. |
| 50nA quiescent current in battery-backup mode | Extends lithium battery life beyond 10 years for static RAM retention in unpowered standby applications. |
| 80Ω VBATT-to-VOUT switch impedance | Minimizes voltage drop under light loads while limiting peak current during switchover transients. |
| ±2% power-fail comparator accuracy | Enables accurate detection of +5V supply dropout at 4.90V (−2%), supporting fail-safe shutdown sequencing. |
Applications
| Industrial Programmable Logic Controllers | Medical Diagnostic Equipment |
|---|---|
Use Scenario: PLC retains I/O configuration and ladder logic state during AC mains interruption using onboard lithium backup. IC Role / Device Role / Timing Role: MAX692AESA+T monitors +5V rail, asserts RESET on brownout, switches VOUT to VBATT, and signals power-fail via PFO to initiate graceful shutdown. Use Value: Prevents corrupted control outputs and memory loss during 10–500ms grid dips, meeting IEC 61000-4-11 immunity requirements. | Use Scenario: Portable ultrasound unit maintains real-time image buffer and calibration data across battery swaps. IC Role / Device Role / Timing Role: MAX692AESA+T provides 200ms RESET pulse on power cycle, enables seamless VBATT switchover to preserve DRAM contents, and flags low-battery via PFI/PFO. Use Value: Eliminates 2–5 second reboot delay between battery changes, sustaining clinical workflow continuity. |
| Automotive Telematics Gateways | Smart Energy Meters |
Use Scenario: Telematics ECU logs crash data and GPS coordinates during vehicle ignition-off transition. IC Role / Device Role / Timing Role: MAX692AESA+T detects 12V-to-5V regulator dropout, holds μP in RESET until backup capacitor discharges below 4.40V, then activates VBATT path to VOUT. Use Value: Guarantees write completion to nonvolatile memory before power collapse, satisfying ISO 26262 ASIL-B data integrity requirements. | Use Scenario: Meter retains time-of-use billing registers and tamper logs during utility power outage. IC Role / Device Role / Timing Role: MAX692AESA+T monitors +5V DC-DC output, triggers PFO interrupt for firmware-initiated save, asserts RESET if VCC drops below 4.40V, and sustains RTC via VBATT. Use Value: Achieves ANSI C12.1 compliance for 10-year battery-backed data retention with <1μA backup current. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX802MESA+ | Identical pinout, same 4.40V reset threshold and 1.6s watchdog; differs only in factory-trimmed power-fail accuracy (±2% guaranteed vs. typical). | Preferred for designs requiring production-tested PFI tolerance; otherwise functionally interchangeable. | Select MAX802MESA+ when ±2% PFI accuracy must be guaranteed per unit, not just typical. |
| MAX706RCSA+ | 2.93V reset threshold, no battery switchover, no PFI/PFO; adds manual reset input and watchdog output. | Suitable for +3.3V systems without backup power; lacks VBATT interface and power-fail warning capability. | Choose MAX706RCSA+ only for 3V systems needing manual reset and no battery support. |
Compared with MAX802MESA+, the MAX692AESA+T offers identical core supervision but slightly looser PFI accuracy specification; versus MAX706RCSA+, it supports +5V operation, battery backup, and power-fail detection-making it uniquely suited for industrial +5V systems requiring full feature integration.
Availability
MAX692AESA+T is available at Aetrix Electronics and suitable for industrial programmable logic controllers, medical diagnostic equipment, automotive telematics gateways, and smart energy meters requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX692AESA+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) designs precision analog and mixed-signal ICs for industrial, medical, and communications applications, with expertise in power management and reliability-critical supervision circuits.
The MAX692AESA+T belongs to Maxim's microprocessor supervisory product line, engineered specifically for robust +5V system monitoring in harsh environments where brownout resilience, battery-backed memory retention, and deterministic reset timing are mandatory.
FAQ
What is the guaranteed minimum VCC voltage at which MAX692AESA+T asserts RESET?
The MAX692AESA+T guarantees RESET assertion down to VCC = 1.2V across its full operating temperature range of −40°C to +85°C. This ensures reliable reset hold during deep brownout events where the +5V supply collapses below standard logic thresholds. The specification is validated per Electrical Characteristics table, condition "MAX69_AE/M, MAX80_ _E, VCC = 1.2V, ISINK = 100μA", confirming logic-low output at this voltage. This behavior is critical for maintaining μP state integrity in industrial power systems.
Does MAX692AESA+T support lithium battery backup, and what is the maximum allowable VBATT voltage?
Yes, the MAX692AESA+T supports lithium battery backup with a maximum allowable VBATT voltage of 4.55V, as specified in Table 2 of the datasheet. This limit prevents excessive current flow through the internal substrate diode (D1) when VCC approaches the 4.40V reset threshold. Lithium cells with open-circuit voltages of 3.0V to 3.6V are ideal; voltages above 4.55V risk damaging the device or causing uncontrolled current paths. The 40mV switchover hysteresis further stabilizes operation during slow VCC decay.
How does the watchdog timer in MAX692AESA+T interact with the RESET output?
The watchdog timer in MAX692AESA+T triggers a 200ms active-low RESET pulse when WDI remains static (high or low) for 1.6 seconds. The internal timer clears automatically upon any RESET assertion, WDI three-state condition, or WDI edge transition. While RESET is asserted, the watchdog remains disabled; once RESET goes high, the timer resumes counting. This interaction ensures that software hangs are recovered without interfering with power-on reset sequences, and prevents false triggers during debug or low-power modes where WDI may be tri-stated.
Can MAX692AESA+T monitor negative supply rails, and how is this implemented?
Yes, MAX692AESA+T can monitor negative supply rails using an external resistor network that references the PFI input to ground, as shown in Figure 7 of the datasheet. When the negative rail degrades (e.g., −12V rises toward 0V), the voltage at PFI increases above 1.25V, causing PFO to go high - signaling failure. The accuracy depends on PFI threshold tolerance (±2%), resistor matching, and VCC stability. This method avoids dedicated negative-voltage supervisors while leveraging the existing 1.25V reference and comparator, making it suitable for legacy industrial systems with dual-rail power supplies.
What is the purpose of the 40mV hysteresis in the MAX692AESA+T battery switchover circuit?
The 40mV hysteresis in the MAX692AESA+T battery switchover circuit prevents rapid toggling between VCC and VBATT paths when VCC decays slowly near the 4.40V reset threshold. Without hysteresis, noise or ripple could cause repeated switching, inducing voltage glitches on VOUT and corrupting CMOS RAM. The hysteresis ensures VBATT engages only when VCC falls below (4.40V − 20mV) and disengages only when VCC rises above (4.40V + 20mV), providing clean, bounce-free power transfer essential for data retention in mission-critical applications.
MAX692AESA+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:
- Battery Backup Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- 4.4V
- 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
MAX692AESA+T FAQ
1.How can I place an order for MAX692AESA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX692AESA+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 MAX692AESA+T reliable?
The price and inventory of MAX692AESA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX692AESA+T is usually 5 days.
3.What payment methods are accepted for MAX692AESA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX692AESA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX692AESA+T?
MAX692AESA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX692AESA+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 MAX692AESA+T?
For technical support, including MAX692AESA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX692AESA+T requirements.
6.How does Aetrix verify that MAX692AESA+T is sourced from the original manufacturer or authorized distributors?
All MAX692AESA+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 MAX692AESA+T meets industry standards.
7.What is the process for return or replacement of MAX692AESA+T?
All MAX692AESA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX692AESA+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 MAX692AESA+T part is unused and in its original packaging.
Return procedure for MAX692AESA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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