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Analog Devices Inc./Maxim Integrated MAX692ACPA
- Part No.:
- MAX692ACPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX692ACPA.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,073
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Product details
Overview
The MAX692ACPA from Maxim Integrated is a microprocessor supervisory circuit providing power-on reset, brownout detection, watchdog timer, battery-backup switching, and power-fail warning in a single 8-pin DIP package. It asserts an active-low RESET output for 200ms when VCC drops below 4.40V, monitors VBATT for CMOS RAM backup, and features a 1.25V PFI comparator with ±2% accuracy for low-battery or supply monitoring - used in industrial controllers and battery-powered instrumentation.
For engineers reviewing the MAX692ACPA datasheet, MAX692ACPA pinout, MAX692ACPA application, or MAX692ACPA equivalent, key selection criteria include its 4.40V reset threshold, 1.6s watchdog timeout, 200μA quiescent current, guaranteed RESET assertion down to VCC = 1V, and compatibility with +5V μP systems requiring reliable power supervision under brownout conditions.
Technical Context
The MAX692ACPA 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 edge transitions; a battery switchover circuit connecting VBATT to VOUT only when VCC falls below threshold and VBATT exceeds VCC by ≥20mV; and a 1.25V reference-based power-fail comparator driving PFO low when PFI < 1.25V.
Its internal architecture uses a P-channel MOSFET for VOUT switching (5Ω on-resistance during VCC operation, 80Ω in battery mode), guarantees RESET assertion at VCC = 1V, and disables the watchdog when WDI is floating or three-stated. The PFI input draws ≤25nA, enabling high-impedance voltage-divider sensing without loading error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V nominal; triggers RESET when VCC falls below this level, ensuring μP remains held in reset during brownout down to 4.25V (min) |
| Reset Pulse Width | 200ms typical; provides sufficient time for μP initialization and peripheral stabilization after power-up or recovery |
| Watchdog Timeout | 1.6s nominal; detects software lockup if WDI is not toggled within this window, preventing system hang |
| Quiescent Current | 200–350μA at VCC = 4.75–5.5V; enables long battery life in always-on monitoring applications |
| Battery-Backup Current | 50nA typical at TA = +25°C; minimizes drain on lithium backup cells during extended power loss |
| Power-Fail Accuracy | ±2% over temperature; ensures reliable early-warning detection of supply degradation before critical brownout |
| VOUT Switch Resistance | 5Ω (VCC mode), 80Ω (VBATT mode); limits voltage drop across switch to <25mV at 5mA load, preserving RAM voltage integrity |
Pinout & Package
MAX692ACPA is housed in an 8-pin plastic DIP (dual in-line package) with 0.300" wide body and 0.100" lead pitch, suitable for through-hole PCB assembly and prototyping.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - VOUT | CMOS RAM supply output | Switches between VCC and VBATT based on voltage comparison; delivers regulated +5V or backup battery voltage to preserve RAM data |
| 2 - VCC | +5V main supply input | Primary power source; monitored for reset generation and used as reference for all internal comparators |
| 3 - GND | Analog/digital ground | Common return path for all internal circuits; must be low-impedance to ensure accurate voltage threshold detection |
| 4 - PFI | Power-fail comparator input | Accepts external voltage divider signal; asserts PFO low when input falls below 1.25V reference |
| 5 - PFO | Power-fail output | Active-low open-drain output signaling impending supply failure or low battery; requires external pull-up |
| 6 - WDI | Watchdog timer input | Edge-sensitive input; reset triggered if no transition occurs within 1.6s; floating state disables watchdog |
| 7 - RESET | Reset output | Active-low push-pull output asserted for 200ms during power-up, brownout, or watchdog timeout; guaranteed valid down to VCC = 1V |
| 8 - VBATT | Backup battery input | Provides alternate power source; connects to VOUT only when VCC < reset threshold and VBATT > VCC + 20mV |
Key Features
| Feature | Design Value |
|---|---|
| Precision 4.40V reset threshold | Enables robust brownout protection for +5V systems operating near lower rail tolerance limits |
| Guaranteed RESET assertion to VCC = 1V | Ensures μP remains held in reset even during deep undervoltage events, preventing erratic execution |
| 200μA supply current (active), 50nA (backup) | Extends operational lifetime of coin-cell or lithium backup sources in unattended systems |
| 80Ω VBATT-to-VOUT switch resistance | Maintains ≥2.7V at VOUT under 250μA RAM load during battery mode, preserving SRAM data integrity |
| ±2% power-fail comparator accuracy | Supports deterministic early-warning response for supply monitoring without calibration overhead |
Applications
| Battery-Powered Controllers | Intelligent Instrumentation |
|---|---|
Use Scenario: Remote environmental sensor node powered by lithium primary cell, requiring RAM retention and fault recovery during intermittent solar charging. IC Role / Device Role / Timing Role: Supervisory IC providing brownout reset, watchdog supervision, and automatic battery switchover to maintain real-time clock and sensor calibration data. Use Value: Prevents data corruption during voltage sag; extends battery life via 50nA backup current; eliminates need for discrete reset + supervisor + switch components. | Use Scenario: Portable handheld multimeter with nonvolatile memory storing calibration coefficients and user settings. IC Role / Device Role / Timing Role: Power supervisor asserting RESET during battery insertion/removal and detecting low battery via PFI comparator. Use Value: Ensures clean μP startup and shutdown; provides precise low-battery warning at 1.25V reference; avoids false resets during transient load spikes. |
| Critical μP Power Monitoring | Industrial PLC I/O Modules |
Use Scenario: Embedded controller in factory automation system where unexpected reset could cause unsafe actuator states. IC Role / Device Role / Timing Role: Primary reset generator with 200ms pulse width and 4.40V threshold, plus watchdog monitoring of firmware health. Use Value: Guarantees μP reset assertion until stable supply is confirmed; prevents runaway code via 1.6s timeout; meets IEC 61508 functional safety timing requirements. | Use Scenario: Distributed I/O module powered from 24VDC field bus with local +5V regulation, requiring immunity to line transients and brownouts. IC Role / Device Role / Timing Role: Voltage supervisor monitoring regulated +5V rail and generating PFO interrupt for graceful I/O shutdown prior to power loss. Use Value: Enables firmware to save pending process data to EEPROM before power collapse; ±2% PFI accuracy ensures consistent trip point across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX802MCPA | Identical reset threshold (4.40V), same pinout, but specified for 0°C to +70°C with ±2% power-fail accuracy guaranteed | Same use cases; optimized for cost-sensitive industrial designs requiring tighter PFI tolerance | Select MAX802MCPA when ±2% PFI accuracy is mandatory and SO packaging is acceptable |
| MAX706RCSA | 2.93V reset threshold, 140ms reset pulse, 1.6s watchdog, 8-pin SO package; lacks battery switchover and PFI comparator | Suitable for +3.3V systems or where backup switching is handled externally; no power-fail warning capability | Choose MAX706RCSA only for 3V systems without battery backup or PFI monitoring needs |
Compared with MAX802MCPA, the MAX692ACPA offers identical core supervision but in DIP packaging for legacy/prototyping use; versus MAX706RCSA, it provides full 5V brownout protection, battery switchover, and PFI detection - making it uniquely suited for battery-backed +5V μP systems requiring comprehensive power management.
Availability
MAX692ACPA is available at Aetrix Electronics and suitable for battery-powered controllers, intelligent instrumentation, and critical μP power monitoring requiring stable component supply across industrial temperature ranges and long-lifecycle programs.
Supply support for MAX692ACPA 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 analog and mixed-signal ICs for power management, interface, sensing, and RF applications.
The MAX692A product line was designed specifically for microprocessor supervisory functions in +5V systems, integrating reset generation, watchdog timing, battery backup control, and power-fail detection into a single compact device.
FAQ
What is the reset threshold voltage of the MAX692ACPA?
The MAX692ACPA has a nominal reset threshold voltage of 4.40V, with a guaranteed range of 4.25V to 4.50V over temperature. This threshold applies to VCC monitoring and triggers the active-low RESET output when the supply voltage falls below this level. The device also includes 40mV hysteresis to prevent chatter during slow voltage transitions. This value is distinct from the MAX690A series (4.65V) and aligns with +5V systems requiring tighter brownout margins.
Does the MAX692ACPA support battery backup for CMOS RAM?
Yes, the MAX692ACPA supports battery backup for CMOS RAM via its VBATT and VOUT pins. When VCC drops below the 4.40V reset threshold and VBATT exceeds VCC by at least 20mV, the internal 80Ω PMOS switch connects VBATT to VOUT, supplying backup power to RAM. Quiescent current in battery mode is as low as 50nA at +25°C, minimizing drain on lithium cells. The switch disconnects automatically when VCC rises 20mV above VBATT.
What is the watchdog timeout period for the MAX692ACPA?
The MAX692ACPA features a fixed 1.6s watchdog timeout period, with a guaranteed range of 1.00s to 2.25s over temperature. The watchdog timer is cleared by any rising or falling edge on the WDI pin and is also reset during RESET assertion or when WDI is left floating or three-stated. If no edge occurs within the timeout window, RESET is pulsed low for 200ms. This provides deterministic software lockup detection without external timing components.
Can the MAX692ACPA monitor a power supply other than +5V?
Yes, the MAX692ACPA can monitor supplies other than +5V using its PFI (Power-Fail Input) pin and internal 1.25V reference. An external resistor divider scales the target supply voltage so that PFI reaches 1.25V at the desired trip point - for example, to detect failure of a +12V rail or low voltage on a lithium cell. The PFI input draws only ≤25nA, enabling high-ratio dividers without significant error. PFO asserts low when PFI falls below 1.25V.
Is the MAX692ACPA pin-compatible with other supervisory ICs?
Yes, the MAX692ACPA is pin-compatible with the MAX692 and MAX692A family members, including MAX692AEPA and MAX692AESA. It shares identical pinout, function mapping, and electrical behavior with these variants. However, it is not pin-compatible with the MAX690A series (4.65V threshold) or MAX805L (active-high RESET), despite mechanical package similarity. Always verify reset threshold and RESET polarity when substituting.
MAX692ACPA 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:
- 4.4V
- 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
MAX692ACPA FAQ
1.How can I place an order for MAX692ACPA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX692ACPA 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 MAX692ACPA reliable?
The price and inventory of MAX692ACPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX692ACPA is usually 5 days.
3.What payment methods are accepted for MAX692ACPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX692ACPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX692ACPA?
MAX692ACPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX692ACPA 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 MAX692ACPA?
For technical support, including MAX692ACPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX692ACPA requirements.
6.How does Aetrix verify that MAX692ACPA is sourced from the original manufacturer or authorized distributors?
All MAX692ACPA 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 MAX692ACPA meets industry standards.
7.What is the process for return or replacement of MAX692ACPA?
All MAX692ACPA units undergo pre-shipment inspection (PSI). If there is an issue with MAX692ACPA, 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 MAX692ACPA part is unused and in its original packaging.
Return procedure for MAX692ACPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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