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Analog Devices Inc./Maxim Integrated MAX692CPA+
- Part No.:
- MAX692CPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
MAX692CPA+.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,390
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Product details
Overview
MAX692CPA+ from Maxim Integrated is an 8-pin microprocessor supervisory circuit providing reset generation, battery backup switchover, watchdog timer, and 1.3V power-fail detection for +5V systems. It features a 4.40V reset threshold, 50ms reset timeout, fixed 1.6s watchdog period, and operates from -40°C to +85°C (E-suffix). Used in industrial controllers and embedded instrumentation to ensure reliable µP startup and brownout recovery.
For engineers reviewing the MAX692CPA+ datasheet, MAX692CPA+ pinout, MAX692CPA+ application, or MAX692CPA+ equivalent, key selection criteria include its precise 4.40V reset threshold, low 1µA battery-backup supply current, integrated VOUT switching between VCC and VBATT, PFI/PFO power-fail warning capability, and compatibility with CMOS RAM backup in space-constrained designs.
Technical Context
The MAX692CPA+ integrates four core supervisory functions in a single 8-pin DIP package: a precision voltage monitor with 4.40V ±50mV reset threshold, a fixed 1.6s watchdog timer with WDI transition detection, a battery switchover circuit that connects VOUT to the higher of VCC or VBATT with 70mV/50mV hysteresis, and a 1.3V comparator for PFI-based power-fail or low-battery warning.
It lacks CE gating, BATT ON, LOW LINE, OSC SEL, and WDO outputs-features present only in the 16-pin MAX691/MAX693 family. Its reset pulse width is fixed at 50ms, and it uses no external timing components; all timing is internally generated via a monostable and oscillator circuit optimized for 5V ±10% supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Reset Threshold | 4.40V ±50mV - ensures reliable reset assertion for 5V ±10% supplies during brownout or power-up. |
| Reset Timeout Delay | 50ms - holds µP in reset long enough for crystal oscillator stabilization after power recovery. |
| Watchdog Timeout | 1.6s nominal - detects software lockup by requiring WDI toggling within this window. |
| Battery Backup Current | 1µA max - extends lithium or alkaline backup battery life for years in standby mode. |
| VOUT Switching | Connects to higher of VCC or VBATT with 70mV/50mV hysteresis - prevents oscillation during slow VCC decay. |
| PFI Threshold | 1.3V - enables configurable power-fail warning via external resistor divider on unregulated or regulated rails. |
| Operating Temp Range | -40°C to +85°C (E-suffix) - qualified for industrial and automotive under-hood environments. |
| Package | 8-pin plastic DIP (0.300" wide) - through-hole compatible with legacy PCB assembly and prototyping. |
Pinout & Package
MAX692CPA+ is housed in an 8-pin plastic DIP (dual in-line package), 0.300" wide, with standard through-hole mounting and JEDEC MS-001AC footprint. Pin 1 is marked with a notch or dot; pins are numbered counter-clockwise from the notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VBATT) | Backup Battery Input | Accepts 2.0V–4.0V battery; internally compared to VCC to enable switchover to VOUT when VCC fails. |
| 2 (RESET) | Active-Low Reset Output | Drives µP RESET line low during power-up, brownout, or watchdog timeout; 50ms pulse width. |
| 3 (WDI) | Watchdog Input | Three-level input (low/mid/high); toggling required every ≤1.6s to prevent reset; floating disables watchdog. |
| 4 (PFO) | Power-Fail Output | Open-drain output goes low when PFI < 1.3V - used for NMI or system shutdown signaling. |
| 5 (VOUT) | Switched Power Output | Delivers higher of VCC or VBATT to CMOS RAM; rated for 50mA; requires ≥0.1µF bypass capacitor. |
| 6 (VCC) | +5V Supply Input | Primary power input; monitored for reset and watchdog functions; absolute max 6.0V. |
| 7 (GND) | Ground Reference | Common return for all analog and digital circuitry; must be low-impedance connection. |
| 8 (PFI) | Power-Fail Input | Noninverting input to 1.3V comparator; connected to resistor divider for custom power-fail threshold. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Supervision | Combines reset, watchdog, battery switchover, and power-fail detection in one IC - eliminates 4+ discrete parts and saves >25mm² board area. |
| Precision Reset Threshold | 4.40V ±50mV - matches 5V ±10% supply tolerance without external trimming, ensuring deterministic reset behavior. |
| Ultra-Low Backup Current | 1µA max in battery mode - enables >10-year backup life with CR2032 or AA alkaline cells. |
| VOUT Switchover Hysteresis | 20mV - prevents chattering during slow VCC ramp-down near VBATT, ensuring clean RAM power handoff. |
| Self-Contained Timing | No external capacitors or crystals needed - internal oscillator and monostable provide fixed 50ms/1.6s timing. |
| Robust Input Protection | PFI and WDI tolerate overvoltage up to (VOUT + 0.5V); VCC/VBATT withstand ±100V/µs slew rate - survives ESD and supply transients. |
Applications
| Industrial Controller Monitoring | Automotive Body Control Module |
|---|---|
|
Use Scenario: PLC or RTU monitoring 24V DC input converted to 5V for µP and I/O logic. IC Role / Device Role / Timing Role: MAX692CPA+ asserts RESET during 5V rail brownout and triggers PFO-based NMI to save fault logs before shutdown. Use Value: Prevents corrupted firmware state and ensures deterministic restart after transient dips - critical for SIL-2 compliance. |
Use Scenario: BCM powering real-time clock and EEPROM during ignition-off battery sleep mode. IC Role / Device Role / Timing Role: MAX692CPA+ switches VOUT to VBATT when vehicle battery drops below 11.5V, while monitoring for low-battery via PFI. Use Value: Enables >5-year RTC accuracy and EEPROM data retention using single coin cell - no external MOSFET or bias network required. |
| Medical Instrument Power Sequencing | Point-of-Sale Terminal Data Integrity |
|
Use Scenario: Portable diagnostic device with Li-ion battery and isolated 5V µP domain. IC Role / Device Role / Timing Role: MAX692CPA+ generates 50ms power-on reset and monitors VCC for sudden disconnects during battery hot-swap. Use Value: Guarantees µP initialization completes before ADC sampling begins - eliminates startup glitches in ECG waveform capture. |
Use Scenario: Retail terminal performing credit card transaction logging to battery-backed SRAM. IC Role / Device Role / Timing Role: MAX692CPA+ holds RESET active during AC power loss and asserts PFO to trigger immediate RAM-to-Flash commit. Use Value: Ensures PCI-DSS compliant transaction atomicity - zero risk of partial log writes during mains failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microprocessor supervisory applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX692CSA+ | Same functionality but in SO-8 package; 0°C to +70°C operating range (C-suffix). | Suitable for commercial-grade consumer electronics where extended temperature is not required. | Select MAX692CSA+ for cost-sensitive, non-industrial designs with surface-mount assembly. |
| TPS3808G12DBVR | TI part with 1.2V reset threshold, adjustable delay (1ms–10s), and 2.5µA quiescent current - no battery switchover or PFI. | Lacks VOUT switching and power-fail comparator; requires external circuitry for RAM backup. | Choose TPS3808G12DBVR only if reset threshold <4.4V is acceptable and battery backup is handled separately. |
Compared with MAX692CPA+, MAX692CSA+ offers identical supervision in a smaller SO-8 footprint but sacrifices industrial temperature range, while TPS3808G12DBVR provides flexible timing and lower IQ but omits critical battery switchover and PFI functions - making MAX692CPA+ uniquely suited for integrated µP + RAM backup in harsh environments.
Availability
MAX692CPA+ is available at Aetrix Electronics and suitable for industrial controllers, automotive body electronics, medical instrumentation, and point-of-sale terminals requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX692CPA+ 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, automotive, and communications applications.
The MAX690–MAX695 family was designed specifically to consolidate power-monitoring, reset, watchdog, and battery-switchover functions into compact, reliable supervisory ICs for µP-based systems - eliminating design complexity and improving field reliability.
FAQ
What is the reset threshold voltage of the MAX692CPA+ and how tightly is it specified?
The MAX692CPA+ has a guaranteed reset threshold of 4.40V, with a minimum of 4.25V and maximum of 4.50V across the full -40°C to +85°C temperature range. This 50mV hysteresis ensures robust operation with standard 5V ±10% power supplies, and the threshold is laser-trimmed at wafer test - no external calibration is needed. The MAX692CPA+ uses this precise threshold to assert RESET reliably during brownout conditions without false triggering.
Does the MAX692CPA+ support battery backup for CMOS RAM, and what are the voltage limits?
Yes, the MAX692CPA+ supports battery backup via its VBATT pin (Pin 1) and VOUT pin (Pin 5). It accepts VBATT voltages from 2.0V to 4.0V and automatically switches VOUT to VBATT when VCC falls below VBATT minus 50–70mV. During backup, VOUT delivers VBATT − 0.1V at 250µA load, and the device draws only 1µA typical supply current - enabling multi-year operation from a CR2032 cell. The MAX692CPA+ thus provides seamless, low-power RAM retention without external MOSFETs or control logic.
Can the watchdog timeout period of the MAX692CPA+ be adjusted, or is it fixed?
The watchdog timeout period of the MAX692CPA+ is fixed at 1.6s nominal - it cannot be adjusted via external components or pin strapping. This is a key distinction from the 16-pin MAX693 family, which offers selectable timeouts via OSC SEL and OSC IN. The MAX692CPA+ watchdog is enabled by driving WDI (Pin 3) with regular transitions; if WDI remains static (high, low, or floating) beyond 1.6s, it triggers a 50ms RESET pulse. Floating WDI disables the watchdog entirely - a deliberate design choice for simplicity in cost-sensitive applications.
How does the MAX692CPA+ implement power-fail detection, and what is the PFI threshold?
The MAX692CPA+ implements power-fail detection using an internal 1.3V reference comparator connected to the PFI pin (Pin 8). When the voltage at PFI drops below 1.3V, the open-drain PFO output (Pin 4) pulls low - typically used to generate a non-maskable interrupt (NMI) to the µP. PFI is intended to be driven by an external resistor divider from either the regulated 5V rail or unregulated input, allowing customizable fail thresholds (e.g., 4.8V warning before 4.4V reset). The MAX692CPA+ PFI input draws only ±25nA, minimizing loading on the sensing network.
What package type and temperature grade does the MAX692CPA+ use, and is it RoHS-compliant?
The MAX692CPA+ is supplied in an 8-pin plastic DIP (dual in-line package), 0.300" wide, with through-hole leads. It is rated for operation from -40°C to +85°C (E-suffix grade), qualifying it for industrial and automotive under-hood applications. The "+" suffix denotes lead-free (RoHS-compliant) construction with matte tin plating. All MAX692CPA+ units shipped by Aetrix Electronics meet JEDEC J-STD-020 moisture sensitivity level 1 and are fully traceable to Maxim's original wafer fab and assembly sites.
MAX692CPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- 35ms Minimum
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
MAX692CPA+ FAQ
1.How can I place an order for MAX692CPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX692CPA+ 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 MAX692CPA+ reliable?
The price and inventory of MAX692CPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX692CPA+ is usually 5 days.
3.What payment methods are accepted for MAX692CPA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX692CPA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX692CPA+?
MAX692CPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX692CPA+ 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 MAX692CPA+?
For technical support, including MAX692CPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX692CPA+ requirements.
6.How does Aetrix verify that MAX692CPA+ is sourced from the original manufacturer or authorized distributors?
All MAX692CPA+ 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 MAX692CPA+ meets industry standards.
7.What is the process for return or replacement of MAX692CPA+?
All MAX692CPA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX692CPA+, 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 MAX692CPA+ part is unused and in its original packaging.
Return procedure for MAX692CPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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