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Analog Devices Inc./Maxim Integrated ICL7665AESA+
- Part No.:
- ICL7665AESA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7665AESA+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,141
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Product details
Overview
ICL7665AESA+ from Maxim Integrated is a dual over/undervoltage monitoring IC for microprocessor supervision, featuring two independently programmable voltage detectors with 2% VSET1 threshold accuracy at +25°C, 3µA typical quiescent current, and operation from 2.0V 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 HYST1/HYST2 outputs for battery-powered power-fail detection.
For engineers reviewing the ICL7665AESA+ datasheet, ICL7665AESA+ pinout, ICL7665AESA+ application, or ICL7665AESA+ equivalent, this device supports precise low-power voltage supervision in systems requiring brownout warning, low-battery shutdown, and dual-threshold fault monitoring with externally adjustable trip points and on-board hysteresis control.
Technical Context
The ICL7665AESA+ integrates a precision 1.3V bandgap reference, two high-impedance comparators (input bias <10nA), and four open-drain outputs-two N-channel sinks (OUT1/OUT2) and two P-channel sources (HYST1/HYST2)-enabling flexible hysteresis implementation via external resistors. Its CMOS architecture ensures minimal loading on monitored supplies.
Each detector's trip point is set by resistor divider networks connected to SET1/SET2 pins, with hysteresis controlled by feedback from HYST1/HYST2 to the respective divider. Propagation delay is typically 75µs, and temperature coefficient is 100ppm/°C across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0V to 16V - supports wide-input battery and line-powered systems without external regulators |
| VSET1 Threshold Accuracy | ±2% at +25°C - enables reliable trip-point setting without calibration or trimming potentiometers |
| Quiescent Current | 3µA typical - extends battery life in portable and energy-sensitive applications |
| Operating Temperature | –40°C to +85°C - qualified for industrial and automotive-adjacent environments |
| Input Bias Current | <10nA - permits use of high-value (up to 10MΩ) external resistors without accuracy loss |
| Output Type | Open-drain N-channel (OUT1/OUT2) and open-drain P-channel (HYST1/HYST2) - allows wire-OR logic and bidirectional hysteresis configuration |
| Propagation Delay | 75µs typical - provides timely response to supply faults while avoiding noise-induced false triggers |
Pinout & Package
ICL7665AESA+ is housed in an 8-pin SO (Small Outline) RoHS-compliant package, 3.9mm × 4.9mm body, 1.27mm pitch, with exposed pad not electrically connected. Pin 1 is marked by beveled corner or dot.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | N-channel open-drain output | Inverting output for first detector; sinks current when VSET1 exceeds threshold |
| 2 (HYST1) | P-channel open-drain hysteresis output | Noninverting source output tied to V+; used to inject hysteresis current into SET1 divider |
| 3 (SET1) | First comparator input | High-impedance node (bias <10nA) for resistor-divider voltage sensing; trip occurs at ~1.3V |
| 4 (GND) | Analog ground reference | Return path for internal reference and comparator circuitry; must be low-impedance |
| 5 (SET2) | Second comparator input | Independent high-Z input for second detector; identical electrical behavior to SET1 |
| 6 (HYST2) | P-channel open-drain hysteresis output | Noninverting source output for second detector; feeds hysteresis into SET2 divider |
| 7 (OUT2) | N-channel open-drain output | Inverting output for second detector; active-low when VSET2 exceeds threshold |
| 8 (V+) | Positive supply rail | Power input (2.0–16V); also serves as source for HYST1/HYST2 outputs |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage detectors | Enables simultaneous overvoltage (OUT1) and undervoltage (OUT2) monitoring with separate trip thresholds |
| On-chip 1.3V precision reference | Eliminates need for external reference; stable over temperature and supply, enabling accurate ratio-based threshold setting |
| Externally programmable hysteresis | Hysteresis magnitude and direction set via resistor networks - avoids oscillation near trip points in noisy environments |
| Low-power CMOS design | 3µA operating current allows continuous monitoring in coin-cell or Li-ion backup systems for years |
| Wide input voltage monitoring range | Supports monitoring of voltages from 1.3V up to several hundred volts using high-ratio resistor dividers |
Applications
| Microprocessor Power Supervision | Battery Backup Switchover |
|---|---|
Use Scenario: Monitoring 5V system rail for brownout during AC mains interruption or regulator failure. IC Role / Device Role / Timing Role: ICL7665AESA+ acts as dual-threshold supervisor: OUT1 asserts power-fail warning at 4.55V (VU), OUT2 triggers hard reset at 3.9V (undervoltage lockout). Use Value: Provides ≥3.5ms advance warning before 5V regulator dropout, enabling safe memory write completion and orderly shutdown. | Use Scenario: Automatic switchover from main +5V supply to 3V lithium backup when primary fails. IC Role / Device Role / Timing Role: First detector (SET1/HYST1/OUT1) controls PNP pass transistor; second detector (SET2/OUT2) drives low-battery LED at 2.6V. Use Value: Ensures uninterrupted CMOS memory operation and user-visible battery status without external logic or MCU intervention. |
| Low-Battery Detection & Disconnect | AC Line Brownout Detection |
Use Scenario: Preventing NiCd battery overdischarge in portable medical devices. IC Role / Device Role / Timing Role: ICL7665AESA+ monitors battery stack voltage; OUT1 triggers disconnect at 5.0V (N−1 cell), OUT2 issues warning at 6.0V (N cell). Use Value: 800mV hysteresis prevents cycling during load transients; 3µA current preserves battery capacity between measurements. | Use Scenario: Detecting 110VAC line sag or outage by monitoring transformer secondary peak voltage. IC Role / Device Role / Timing Role: OUT1 discharges timing capacitor every half-cycle; OUT2 asserts power-fail when capacitor voltage falls below 1.3V after 42ms (2.5 line cycles). Use Value: Immune to short dips; provides deterministic, RC-timed warning aligned with AC phase, eliminating false triggers from ripple. |
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 programming, 0.9µA IQ | Lacks dual detection, external hysteresis, and adjustable trip points; suited only for simple reset generation | Select only if single-supply monitoring with fixed threshold suffices and board space is constrained |
| MAX6326UT46D3+ | Single-supply 4.63V reset IC with 200ms timeout, 1.6µA IQ, no programmability | No dual outputs, no hysteresis adjustment, no voltage monitoring flexibility; designed for reset-only use | Choose only for basic µP reset where trip point and timing are fixed and unchanging |
Compared with TLV809E33DBZR and MAX6326UT46D3+, the ICL7665AESA+ uniquely supports two independently programmable thresholds, on-board hysteresis control, and ultra-low 3µA operation - making it the only option for adaptive, multi-rail, battery-aware supervision without MCU involvement.
Availability
ICL7665AESA+ is available at Aetrix Electronics and suitable for microprocessor voltage monitoring, low-battery detection, and power-fail warning applications requiring stable component supply across industrial temperature ranges and long-life battery operation.
Supply support for ICL7665AESA+ 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 power management, sensing, and interface applications, with emphasis on reliability and low-power performance.
The ICL7665AESA+ belongs to Maxim's microprocessor supervisory IC product line, engineered specifically for robust, low-quiescent-current voltage monitoring in battery-backed and industrial systems where dual-threshold detection and field-programmable hysteresis are required.
FAQ
What is the supply voltage range for the ICL7665AESA+?
The ICL7665AESA+ operates from a supply voltage of 2.0V to 16V, as specified in its Electrical Characteristics table for the ICL7665A grade. This range supports direct connection to common battery chemistries (Li-ion, NiCd, alkaline) and regulated DC rails. Operation below 2.0V is not guaranteed, and absolute maximum rating is 18V including transients.
How accurate is the VSET1 threshold of the ICL7665AESA+ over temperature?
The ICL7665AESA+ guarantees ±2% VSET1 threshold accuracy at +25°C and maintains ±2.5% accuracy across the full –40°C to +85°C operating range. Its 100ppm/°C temperature coefficient ensures predictable drift, eliminating need for external trimming in most industrial applications.
Can the ICL7665AESA+ monitor voltages higher than its supply voltage?
Yes - the ICL7665AESA+ can monitor input voltages significantly higher than V+, including several hundred volts, using high-ratio external resistor dividers on SET1 and SET2. The input bias current is under 10nA, allowing use of MΩ-range resistors without accuracy degradation.
What are the output configurations of the ICL7665AESA+?
The ICL7665AESA+ features four open-drain outputs: OUT1 and OUT2 are N-channel sinks referenced to GND; HYST1 and HYST2 are P-channel sources referenced to V+. This enables wire-OR logic, TTL-level interfacing with pull-ups, and flexible hysteresis injection into voltage dividers.
Does the ICL7665AESA+ require external components to function?
Yes - the ICL7665AESA+ requires external resistor networks on SET1/SET2 to define trip voltages, and optional resistors on HYST1/HYST2 to implement hysteresis. No external capacitors or references are needed, as the 1.3V bandgap reference and comparators are monolithic. A bypass capacitor on V+ is recommended for noise immunity.
ICL7665AESA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Multi-Voltage Supervisor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- Active High
- Reset Timeout:
- <1ms Minimum
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7665AESA+ FAQ
1.How can I place an order for ICL7665AESA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7665AESA+ 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 ICL7665AESA+ reliable?
The price and inventory of ICL7665AESA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7665AESA+ is usually 5 days.
3.What payment methods are accepted for ICL7665AESA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7665AESA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7665AESA+?
ICL7665AESA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7665AESA+ 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 ICL7665AESA+?
For technical support, including ICL7665AESA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7665AESA+ requirements.
6.How does Aetrix verify that ICL7665AESA+ is sourced from the original manufacturer or authorized distributors?
All ICL7665AESA+ 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 ICL7665AESA+ meets industry standards.
7.What is the process for return or replacement of ICL7665AESA+?
All ICL7665AESA+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7665AESA+, 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 ICL7665AESA+ part is unused and in its original packaging.
Return procedure for ICL7665AESA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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