ICL7665CPA+ - Dual Voltage Supervisor | Analog Devices
MPN: ICL7665CPA+ ✓ ActiveICL7665CPA+ Overview
A voltage supervisor is a semiconductor device that monitors a power rail and changes its output state when the monitored voltage crosses a configured threshold. It belongs to the hierarchy of voltage supervisors, reset controllers, system-protection ICs, and power-management semiconductors. By supervising processor rails independently, the ICL7665CPA+ helps a system identify excessive or insufficient supply conditions before the monitored logic becomes unreliable.
The two detector channels are programmed independently with external resistors, allowing separate overvoltage and undervoltage limits to be established. Each monitored threshold can be set above 1.3 V according to the Analog Devices ICL7665 Data Sheet, Rev. 3. Open-drain or open-collector outputs support wired-AND fault signaling, external pull-up networks, and connection to a system reset, interrupt, or power-control input.
The low 3 µA typical operating current makes the part suitable for systems where supervisory circuitry must remain active with minimal continuous load. Its 1.6 V to 16 V operating-supply range also allows it to monitor multiple common supply levels without requiring a separate high-voltage supervisor. Exact timing, reset-delay, logic-state, and absolute-maximum details should be confirmed in the manufacturer data sheet before final circuit release.
Typical uses include detecting abnormal supply conditions in microcomputer systems, generating reset or interrupt requests for processors, supervising multiple rails in industrial controls, and protecting programmable logic or communications equipment. Independent thresholds are especially useful when one rail requires overvoltage detection while another requires undervoltage detection.
In circuit design, pull up each open-drain output to the appropriate logic supply and account for the maximum pull-up voltage when it exceeds the supervisor supply. Place threshold-setting resistors close to their associated pins, and verify that fault signal polarity matches the system controller. Because a supervisor does not regulate voltage, it must be paired with a suitable regulator or power converter.
This product page combines manufacturer specifications, replacement guidance, application analysis, and practical design notes to support faster component selection. It also distinguishes true pin-compatible alternatives from merely similar voltage supervisors and highlights the electrical conditions that must be checked before using a substitute part.
Drop-in alternatives for ICL7665CPA+ — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
ICL7665CPA
✅ Drop-In📋 Reference alternative (not in catalog)
ICL7665EPA
✅ Drop-In📋 Reference alternative (not in catalog)
ICL7665CPA+ Specifications
| Device Type | Dual-channel microprocessor voltage supervisor |
| Number of Channels | 2 channels |
| Detection Functions | Overvoltage and undervoltage detection |
| Supply Voltage Range | 1.6 V to 16 V |
| Minimum Monitored Voltage | 1.3 V |
| Typical Operating Current | 3 µA |
| Output Type | Open drain or open collector |
| Number of Threshold Channels | 2 independently programmed thresholds |
| Package | 8-pin PDIP |
| Pin Count | 8 pins |
| Mounting Type | Through-hole |
| Data Sheet Revision | Rev. 3 |
ICL7665CPA+ 8-pin pdip Pin Configuration Guide
Pin configuration for ICL7665CPA+ (8-pin pdip package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for ICL7665CPA+.
Refer to the datasheet for full pin configuration.
Typical Applications
ICL7665CPA+ is suitable for 6 applications: Microprocessor Rail Supervision, Industrial Control Systems, Communication Equipment, Programmable Logic Control, Automotive Telemetry Modules, Portable and Battery-Powered Systems.
Microprocessor Rail Supervision
The ICL7665CPA+ fits processor systems that require independent overvoltage and undervoltage warnings. Its two threshold channels can monitor separate rails, while the 1.6 V to 16 V operating range permits use with common logic supplies. The typical 3 µA operating current is especially useful in continuously powered equipment. Pull up the fault outputs to the processor interface supply and route them to reset or interrupt inputs according to the system fault policy.
Recommended
Industrial Control Systems
ICL7665CPA+ provides a compact fault-detection function for industrial controllers operating from supplies within its 1.6 V to 16 V range. Independent threshold programming allows a control module to identify both excessive and insufficient rail conditions before field equipment behaves unpredictably. Its 8-pin PDIP format supports through-hole construction, while the 3 µA typical supply current minimizes supervisory overhead. Designers should verify the selected ordering grade against the enclosure temperature range.
Recommended
Communication Equipment
The dual-channel architecture of ICL7665CPA+ is useful in communication equipment that monitors more than one supply condition. One channel can indicate undervoltage while the other identifies overvoltage, allowing the host processor to distinguish recoverable rail faults from other system errors. Open-drain outputs make it straightforward to combine status signals with a shared pull-up or system fault bus. Keep threshold resistors near the device and confirm signal polarity at the communications controller.
Recommended
Programmable Logic Control
ICL7665CPA+ can supervise supplies feeding programmable logic by detecting both high and low rail conditions around configured trip points. Because the outputs are open drain or open collector, external pull-ups can establish the voltage-domain and logic polarity required by the controller. The low 3 µA operating current avoids adding significant load to low-power control systems. Confirm threshold tolerance and reset behavior in the final power tree, especially during slow supply ramps.
Recommended
Automotive Telemetry Modules
ICL7665CPA+ can support fault detection in compact telemetry or accessory-control modules when the selected ordering grade satisfies the required environmental limits. Its dual threshold channels can watch a logic rail and a sensor or communications supply independently, while the low quiescent current preserves standby efficiency. The open-collector outputs provide flexible integration with reset, warning-lamp, or telemetry paths. Automotive deployment also requires confirmation of AEC-Q100 status and the exact temperature grade.
Recommended
Portable and Battery-Powered Systems
The 3 µA typical operating current of ICL7665CPA+ makes it appropriate for battery-powered equipment that must remain supervised during long idle periods. Its ability to operate from a supply as low as 1.6 V supports low-energy control domains, while monitored voltages may begin at 1.3 V. Use the open-drain outputs to minimize static loading and select pull-up values that balance fault-state current against signal rise time in the completed system.
Recommended
Recommended Products Summary
Engineering reference data for ICL7665CPA+ — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ICL7665CPA | ICL7665EPA |
|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Package | 8-pin PDIP | 8-pin PDIP | 8-pin PDIP |
| Device Type | Dual microprocessor voltage supervisor | Dual microprocessor voltage supervisor | Dual microprocessor voltage supervisor |
| Number of Channels | 2 channels | 2 channels | 2 channels |
| Detection Functions | Overvoltage and undervoltage detection | Overvoltage and undervoltage detection | Overvoltage and undervoltage detection |
| Operating Supply Range | 1.6 V to 16 V | 1.6 V to 16 V | 1.6 V to 16 V |
| Minimum Monitored Voltage | 1.3 V | 1.3 V | 1.3 V |
| Typical Operating Current | 3 µA | 3 µA | 3 µA |
| Output Type | Open drain or open collector | Open drain or open collector | Open drain or open collector |
| Threshold Configuration | Two independent external-resistor thresholds | Two independent external-resistor thresholds | Two independent external-resistor thresholds |
Key Differentiators
- Two independently programmable fault thresholds (vs ICL7665CPA)
- Low supervisory supply consumption (vs ICL7665EPA)
- Open-collector fault-output flexibility (vs ICL7665EPA)
- Broad operating-supply range (vs ICL7665CPA)
Design Notes
Size the external pull-up network from the maximum open-drain output voltage and the required fault-state current rather than from the supervisor supply current alone. A lower pull-up resistance improves rise time and strengthens noise immunity, while a higher value reduces static consumption when the output is released. Check that the pull-up rail remains within the supervisor's permitted output range and that every pull-up load is included in the standby power budget.
Place threshold-setting resistors and any bypass capacitor close to their associated ICL7665CPA+ pins to reduce susceptibility to coupled noise and input leakage errors. Route the two monitored-voltage inputs away from switching nodes and high-current return paths. Because the device is a fault detector rather than a regulator, keep its sensing paths physically distinct from power-stage traces wherever the board layout permits.
Do not treat the two ICL7665CPA+ threshold inputs as interchangeable because they represent separate overvoltage and undervoltage channels. Confirm each resistor value against the threshold equation in the manufacturer data sheet, including channel polarity and hysteresis. Also verify that a fault condition produces the logic state expected by the processor reset or interrupt input; open-collector outputs do not actively drive a high voltage.
For through-hole PCB construction, follow the manufacturer's PDIP footprint and pin numbering rather than orienting the device solely from the physical position of its output functions. Maintain adequate spacing around the package for assembly inspection and soldering access. If the monitored rails are noisy, use local filtering and confirm that filtering does not distort the intended threshold crossing or delay the supervisor's response.
Compliance Information
The ICL7665 family product page identifies the device as production status but does not state the compliance results for the ICL7665CPA+ ordering option. Obtain current declarations for the exact ordering code before regulated or automotive procurement.
