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Analog Devices Inc./Maxim Integrated ICL7665CPA
- Part No.:
- ICL7665CPA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- -
- Datasheet:
-
ICL7665CPA.pdf
- Description:
- ICL7665 MICROPROCESSOR VOLTAGE M
- Quantity:
- Payment:
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Product details
Overview
ICL7665CPA from Maxim Integrated is a dual over/undervoltage microprocessor supervisor IC featuring two independently programmable voltage detectors, 3µA typical quiescent current, ±5mV trip-voltage difference between SET1 and SET2, and operation from 1.6V to 16V supply. It monitors voltages ≥1.3V using external resistor dividers and delivers open-drain N-channel OUT1/OUT2 and open-drain P-channel HYS1/HYS2 outputs for battery-powered µP reset and power-fail warning circuits.
For engineers reviewing the ICL7665CPA datasheet, ICL7665CPA pinout, ICL7665CPA application, or ICL7665CPA equivalent, this device serves as a low-power, externally configurable dual-threshold voltage monitor with hysteresis support-critical for brownout detection, low-battery shutdown, and single/multi-rail power supervision in portable and industrial embedded systems.
Technical Context
The ICL7665CPA integrates a precision 1.3V bandgap reference, two high-impedance comparators (input bias <10nA), and four dedicated output drivers: two N-channel sinks (OUT1, OUT2) and two P-channel sources (HYST1, HYST2). Its trip points are set by external resistive dividers on SET1/SET2 pins, with hysteresis controlled via HYST1/HYST2 feedback paths.
It operates across 0°C to +70°C, supports 1.6V–16V V+ supply, and maintains 100ppm/°C VSET temperature coefficient. Propagation delay is 75µs typical, and output saturation voltages are specified down to 0.06V (V+ = 15V, IOUT = 2mA), enabling direct TTL interfacing with pull-ups.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.6V to 16V - enables use with Li-ion, alkaline, and regulated 3.3V/5V/12V rails without level-shifting. |
| Quiescent Current | 3µA typical - extends battery life in always-on monitoring applications such as backup memory supervisors. |
| Reference Voltage | 1.3V internal bandgap - sets comparator threshold baseline; allows external programming of trip points ≥1.3V. |
| Output Types | Two open-drain N-channel (OUT1, OUT2) + two open-drain P-channel (HYST1, HYS2) - supports wire-OR logic and bidirectional hysteresis control. |
| Input Leakage Current | ±0.01nA typical - permits use of >10MΩ external divider resistors without accuracy loss. |
| Propagation Delay | 75µs typical - ensures timely response to supply transients while avoiding noise-induced false triggers. |
| VSET Tempco | 100ppm/°C - guarantees stable trip-point drift over full operating temperature range (0°C to +70°C). |
Pinout & Package
ICL7665CPA is housed in an 8-pin plastic DIP (dual in-line package) with 0.300" wide body and through-hole mounting. Pin 1 is marked with a notch or dot; pin numbering follows standard counter-clockwise layout from top view.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | N-channel open-drain output | Inverting output tied to VSET1; sinks current when VSET1 exceeds 1.3V - used for undervoltage warning or reset assertion. |
| 2 (OUT2) | N-channel open-drain output | Inverting output tied to VSET2; sinks current when VSET2 exceeds 1.3V - used for overvoltage warning or secondary fault indication. |
| 3 (SET2) | Comparator 2 input | High-impedance node (≤10nA leakage) for external voltage divider - sets overvoltage trip point relative to 1.3V reference. |
| 4 (SET1) | Comparator 1 input | High-impedance node (≤10nA leakage) for external voltage divider - sets undervoltage trip point relative to 1.3V reference. |
| 5 (GND) | Ground reference | Analog and digital ground return; must be low-impedance connection to minimize noise coupling into sensitive comparator inputs. |
| 6 (HYST1) | P-channel hysteresis output | Open-drain source referenced to V+; provides positive feedback to SET1 to implement adjustable hysteresis for noise immunity. |
| 7 (HYST2) | P-channel hysteresis output | Open-drain source referenced to V+; provides positive feedback to SET2 to implement independent hysteresis for second detector. |
| 8 (V+) | Positive supply rail | Power input (1.6V–16V); also supplies internal reference and drives HYST1/HYST2 sources - requires local 0.1µF bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage detectors | Enables simultaneous monitoring of overvoltage (e.g., 5.55V) and undervoltage (e.g., 4.45V) thresholds on same supply rail using separate SET1/SET2 dividers. |
| Externally programmable trip points | Supports custom thresholds ≥1.3V via resistor dividers - eliminates need for multiple fixed-threshold supervisors in multi-rail systems. |
| On-board hysteresis outputs | HYS1/HYS2 pins allow precise hysteresis tuning (e.g., 100mV) without external op-amps or comparators - reduces BOM count and PCB area. |
| 3µA typical supply current | Enables continuous monitoring in energy-constrained devices like coin-cell–powered real-time clocks or backup SRAM supervisors. |
| 1.3V internal reference | Stable, low-drift bandgap reference shared by both comparators - ensures consistent trip-point alignment and simplifies calibration. |
| Open-drain N/P outputs | Allows flexible interface options: OUT1/OUT2 drive TTL/CMOS with pull-ups; HYS1/HYS2 inject current into SET nodes for hysteresis control. |
Applications
| Battery-Powered Microcontroller Reset | Multi-Rail Power Supply Fault Monitoring |
|---|---|
Use Scenario: A handheld medical sensor uses a 3.6V Li-ion battery and an ARM Cortex-M0 MCU requiring clean reset during discharge below 2.8V. IC Role / Device Role / Timing Role: ICL7665CPA acts as undervoltage detector (SET1) and overvoltage protector (SET2), asserting OUT1 to hold MCU in reset until battery recovers above 2.9V. Use Value: Prevents erratic MCU behavior and flash corruption during brownout, leveraging 3µA quiescent current to avoid accelerating battery drain. |
Use Scenario: An industrial PLC monitors +5V, +12V, and –5V rails simultaneously to detect faults before system lockup. IC Role / Device Role / Timing Role: ICL7665CPA's SET1 and SET2 accept scaled inputs from each rail; OUT1/OUT2 feed OR-gated "POWER_OK" signal to system watchdog. Use Value: Reduces component count vs. discrete comparator solutions while maintaining independent hysteresis per rail via HYST1/HYST2 feedback. |
| AC Line Brownout Detection | Lithium Backup Switchover Control |
Use Scenario: A smart meter detects AC mains sag below 90% nominal to trigger graceful shutdown before capacitor hold-up expires. IC Role / Device Role / Timing Role: ICL7665CPA monitors rectified AC peak via SET2; HYST2 configures 200ms hysteresis to reject line noise while ensuring reliable trip at 102VAC. Use Value: Eliminates need for external timing capacitors or microcontroller polling - achieves deterministic response with <75µs delay. |
Use Scenario: A network router switches SRAM power from +3.3V main supply to 3V lithium coin cell upon main rail loss. IC Role / Device Role / Timing Role: ICL7665CPA's OUT1 controls PNP pass transistor for switchover; OUT2 monitors coin cell voltage and disables write access below 2.6V. Use Value: Ensures data integrity during power transition and prevents deep discharge of backup battery using dual independent thresholds. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-threshold voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV809E33DBZR | Single-channel 3.3V fixed threshold, no hysteresis output, 0.9µA IQ, SOT-23-3 package | Only monitors one rail; lacks programmability and hysteresis control - suitable only for simple reset generation, not dual-condition supervision. | Select when cost and footprint are critical and only one fixed threshold is required. |
| MAX6816ESA+ | Dual-channel, 2.5V/3.0V fixed thresholds, integrated hysteresis, 1.5µA IQ, SO-8 RoHS-compliant | Fixed thresholds limit flexibility; no external SET pin adjustment - appropriate for standardized 3.3V/5V systems but not custom voltage rails. | Choose for drop-in replacement in legacy designs where pinout matches and thresholds align. |
Compared with TLV809E33DBZR and MAX6816ESA+, the ICL7665CPA uniquely supports fully programmable dual thresholds, independent hysteresis per channel, and ultra-low 3µA supply current in a through-hole DIP package - making it optimal for prototyping, legacy board upgrades, and battery-critical applications demanding design flexibility.
Availability
ICL7665CPA is available at Aetrix Electronics and suitable for battery-powered microcontroller reset, multi-rail power supply fault monitoring, and AC line brownout detection requiring stable component supply and long-term obsolescence management.
Supply support for ICL7665CPA 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, mixed-signal, and power-management ICs for industrial, communications, and computing applications.
The ICL7665CPA belongs to Maxim's microprocessor supervisor product line, designed specifically for low-power, dual-threshold voltage monitoring in battery-backed and multi-supply embedded systems where reliability and configurability are essential.
FAQ
What is the function of the HYST1 and HYST2 pins on the ICL7665CPA?
The HYST1 and HYST2 pins on the ICL7665CPA are open-drain P-channel outputs referenced to V+. When asserted, they source current into the SET1 or SET2 nodes to raise the effective trip voltage, creating programmable hysteresis. This prevents output oscillation near threshold due to noise or slow-moving supply transients - a key capability confirmed in the ICL7665CPA datasheet's Figure 4 and Applications Information section.
Can the ICL7665CPA monitor voltages higher than its V+ supply?
Yes, the ICL7665CPA can monitor input voltages significantly higher than its V+ supply - up to several hundred volts - using appropriately scaled external resistor dividers on the SET1 and SET2 pins. The internal comparators reference only the 1.3V bandgap, and input leakage remains below 10nA, enabling high-impedance scaling without loading the monitored source. This capability is explicitly stated in the General Description and verified in Typical Operating Circuit examples.
What is the maximum sink current capability of OUT1 and OUT2 on the ICL7665CPA?
The ICL7665CPA's OUT1 and OUT2 pins are rated for a maximum sink current of 25mA each, as specified in the Absolute Maximum Ratings table. In practice, typical saturation voltage is ≤0.3V at 2mA (V+ = 5V), confirming robust TTL/CMOS drive capability with external pull-up resistors. This value is measured and guaranteed across the 0°C to +70°C operating range for the ICL7665CPA variant.
How does the ICL7665CPA differ from the ICL7665A variants?
The ICL7665CPA features ±5mV typical difference between VSET1 and VSET2 trip points and 100ppm/°C tempco, whereas the ICL7665A offers tighter 2% threshold accuracy at +25°C and improved temperature stability. The "C" grade denotes 0°C to +70°C operation, while "A" adds enhanced initial accuracy - both share identical pinout, package, and functional architecture. These distinctions are documented in the Electrical Characteristics tables for ICL7665CPA and ICL7665ACPA.
Is the ICL7665CPA RoHS-compliant?
The standard ICL7665CPA is not RoHS-compliant, as confirmed by Maxim's official ordering information and materials analysis reports. RoHS-compliant versions are designated with a "+" suffix (e.g., ICL7665CPA+), which uses lead-free terminations and meets JEDEC J-STD-609 requirements. Always verify suffix and packaging code when selecting for compliance-sensitive designs.
ICL7665CPA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- -
- Type:
- -
- Number of Voltages Monitored:
- -
- Voltage - Threshold:
- -
- Output:
- -
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
ICL7665CPA FAQ
1.How can I place an order for ICL7665CPA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7665CPA 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 ICL7665CPA reliable?
The price and inventory of ICL7665CPA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7665CPA is usually 5 days.
3.What payment methods are accepted for ICL7665CPA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7665CPA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7665CPA?
ICL7665CPA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7665CPA 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 ICL7665CPA?
For technical support, including ICL7665CPA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7665CPA requirements.
6.How does Aetrix verify that ICL7665CPA is sourced from the original manufacturer or authorized distributors?
All ICL7665CPA 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 ICL7665CPA meets industry standards.
7.What is the process for return or replacement of ICL7665CPA?
All ICL7665CPA units undergo pre-shipment inspection (PSI). If there is an issue with ICL7665CPA, 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 ICL7665CPA part is unused and in its original packaging.
Return procedure for ICL7665CPA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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