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Analog Devices Inc./Maxim Integrated ICL7665CSA
- Part No.:
- ICL7665CSA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ICL7665CSA.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,618
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Product details
Overview
ICL7665CSA from Maxim Integrated is a dual over/undervoltage monitor IC for microprocessors, featuring two independently programmable voltage detectors with 1.3V internal reference, 3µA typical supply current, and operation from 1.6V to 16V supply. It delivers open-drain N-channel OUT1/OUT2 and open-drain P-channel HYS1/HYS2 outputs for battery-powered system supervision.
For engineers reviewing the ICL7665CSA datasheet, ICL7665CSA pinout, ICL7665CSA application, or ICL7665CSA equivalent, this device supports precise low-power voltage fault detection in portable electronics, power supply monitoring, and backup switchover circuits where quiescent current, external resistor programmability, and hysteresis control are critical selection criteria.
Technical Context
The ICL7665CSA integrates a precision 1.3V bandgap reference with two high-impedance comparators, enabling externally set trip points via resistor dividers on SET1 and SET2 pins. Its dual-output architecture provides independent inverting (OUT1) and noninverting (OUT2, HYST1, HYST2) logic states with open-drain topology.
Each detector supports hysteresis via dedicated HYSTx outputs tied to V+, allowing user-defined hysteresis width without affecting trip thresholds. Propagation delay is typically 75µs, and input bias current is under 10nA - enabling use of multi-megohm divider networks while maintaining accuracy.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.6V to 16V - powers directly from single-cell Li-ion up to industrial 12V rails without regulation |
| Quiescent Current | 3µA typical - enables multi-year battery life in always-on voltage supervision applications |
| Reference Voltage | 1.3V ±50mV - stable internal threshold used to derive all trip points via external resistors |
| Input Bias Current | <10nA - permits use of >1MΩ external resistors without significant trip-point error |
| Output Type | Open-drain N-channel (OUT1/OUT2) and open-drain P-channel (HYST1/HYST2) - supports wire-OR, TTL interfacing, and bidirectional hysteresis control |
| Propagation Delay | 75µs typical - ensures timely response to brownout/fail conditions without excessive noise sensitivity |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded systems and consumer electronics |
Pinout & Package
ICL7665CSA is housed in an 8-pin SO (Small Outline) package, RoHS-compliant and surface-mount compatible. Pin functions are validated per Maxim's official pin configuration diagram and truth table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| V+ | Positive Supply Input | Primary power rail connection; also source node for HYST1/HYST2 P-channel outputs |
| GND | Ground Reference | Return path for supply and comparator reference; substrate tied to V+ per die topography |
| SET1 | Comparator 1 Input | Monitors voltage divider output; trips when ≈1.3V - sets overvoltage threshold for OUT1 |
| SET2 | Comparator 2 Input | Monitors second voltage divider; trips when ≈1.3V - sets undervoltage threshold for OUT2 |
| OUT1 | Inverting Open-Drain Output | Sinks current when SET1 > 1.3V - active-low overvoltage warning signal |
| OUT2 | Noninverting Open-Drain Output | Sinks current when SET2 < 1.3V - active-low undervoltage warning signal |
| HYST1 | Hysteresis Control Output 1 | Sources current from V+ when SET1 > 1.3V - enables programmable hysteresis for OUT1 |
| HYST2 | Hysteresis Control Output 2 | Sources current from V+ when SET2 < 1.3V - enables programmable hysteresis for OUT2 |
Key Features
| Feature | Design Value |
|---|---|
| Dual Independent Detectors | One for overvoltage (OUT1), one for undervoltage (OUT2), each with separate SET and HYST pins |
| Externally Programmable Thresholds | Any trip point >1.3V set via resistor dividers - no trimming required for standard 3.3V/5V rails |
| On-Chip Hysteresis Outputs | HYST1/HYST2 provide current-source hysteresis control - eliminates need for external Schmitt triggers |
| Ultra-Low Quiescent Current | 3µA typical at 2V–15V supply - reduces standby power in battery-backed memory and IoT edge nodes |
| CMOS Monolithic Design | 38-transistor layout with V+ substrate tie - ensures latchup immunity when supply sequencing rules are followed |
Applications
| Power-Fail Detection | Battery Backup Switchover |
|---|---|
Use Scenario: Monitoring unregulated DC input to a 7805 regulator to warn of impending 5V rail collapse before dropout. IC Role / Device Role / Timing Role: ICL7665CSA acts as a predictive power-fail supervisor, generating early-warning signal when input falls below 8.0V. Use Value: Provides ≥3.5ms advance notice before regulated output fails - sufficient time to save state or initiate graceful shutdown. | Use Scenario: Automatically switching CMOS memory supply from main +5V to 3V lithium backup cell when line power drops. IC Role / Device Role / Timing Role: ICL7665CSA controls PNP pass transistor via OUT1; second detector monitors battery health via OUT2. Use Value: Ensures zero-interruption memory retention and prevents data corruption during AC outage or battery depletion. |
| Low-Battery Warning | Multi-Rail Power Supply Monitoring |
Use Scenario: Detecting NiCd battery discharge to 6.0V (1.0V/cell × 6 cells) with 100mV hysteresis to avoid chatter near threshold. IC Role / Device Role / Timing Role: ICL7665CSA serves as precision low-voltage alarm generator using SET2 and HYST2 for hysteresis. Use Value: Enables early user alert before irreversible cell reversal - extends battery cycle life and avoids permanent damage. | Use Scenario: Simultaneous supervision of +5V and +15V rails in industrial controller, triggering POWER_OK only when both are in spec. IC Role / Device Role / Timing Role: ICL7665CSA uses shared SET1/SET2 inputs with resistor networks to detect faults on multiple supplies. Use Value: Reduces BOM count by replacing two discrete supervisors - maintains independence while sharing reference and outputs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual voltage monitoring applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US29D3+ | Single-supply reset IC with fixed 2.93V threshold; no dual independent detectors or hysteresis programming | Only suitable for single-rail reset generation, not over/undervoltage pair detection | Select only if fixed-threshold reset suffices and dual monitoring is unnecessary |
| TPS3808G12DBVR | Adjustable watchdog timer with 1.2V threshold; lacks second detector and HYST outputs for hysteresis control | Designed for microprocessor reset timing, not simultaneous over/undervoltage supervision | Choose only for reset-with-delay applications where hysteresis and dual thresholds are not required |
Compared with MAX6326US29D3+ and TPS3808G12DBVR, the ICL7665CSA uniquely supports two fully independent, resistor-programmable voltage detectors with dedicated hysteresis control outputs - making it irreplaceable for applications requiring coordinated over/undervoltage fault signaling on separate rails or thresholds.
Availability
ICL7665CSA is available at Aetrix Electronics and suitable for battery-powered instrumentation, power supply fault monitoring, and microprocessor supervisory circuits requiring stable component supply across commercial temperature range.
Supply support for ICL7665CSA 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.
The ICL7665CSA belongs to Maxim's microprocessor supervisory product line, engineered specifically for ultra-low-power, dual-threshold voltage monitoring in portable and embedded systems where supply current and external component count are critical constraints.
FAQ
What is the function of the HYST1 and HYST2 pins on the ICL7665CSA?
The HYST1 and HYST2 pins on the ICL7665CSA are open-drain P-channel current sources referenced to V+. When activated, they inject current into external hysteresis resistors to shift the lower trip point - enabling user-defined hysteresis width without altering the primary threshold set by the SET1/SET2 resistor dividers. This eliminates need for external Schmitt triggers and simplifies design of noise-immune voltage monitors.
Can the ICL7665CSA monitor voltages higher than its 16V supply rating?
Yes - the ICL7665CSA can monitor input voltages from 1.3V up to several hundred volts using external resistor dividers on the SET1 and SET2 pins. The device itself operates from 1.6V to 16V, but the high-impedance comparator inputs (bias current <10nA) allow safe attenuation of high-voltage signals while preserving accuracy. Absolute maximum input voltage is limited to (V+ + 0.3V) per datasheet absolute ratings.
Does the ICL7665CSA have built-in hysteresis, or must it be added externally?
The ICL7665CSA does not include fixed internal hysteresis. Instead, it provides dedicated HYST1 and HYST2 outputs that act as controllable current sources to implement programmable hysteresis via external resistors. This architecture gives designers full control over hysteresis width and allows optimization for specific noise environments - unlike fixed-hysteresis supervisors which offer no adjustment.
What is the minimum supply voltage required for reliable operation of the ICL7665CSA?
The ICL7665CSA guarantees operation down to 1.6V at +25°C and 1.8V across the full 0°C to +70°C temperature range. At 1.6V supply, quiescent current remains below 10µA and propagation delay stays within specification. This enables direct use with single-cell alkaline, NiMH, or LiFePO₄ batteries without pre-regulation.
How does the ICL7665CSA differ from the ICL7665A variant?
The ICL7665CSA uses the base ICL7665 core with ±150mV (±11.5%) trip voltage tolerance at +25°C, while the ICL7665ACSA variant features improved 2% threshold accuracy (±26mV) and guaranteed performance over temperature. Both share identical pinout, package, and functional architecture - the A-grade version is selected when tighter initial accuracy and lower tempco (100ppm/°C) are required for precision rail monitoring.
ICL7665CSA 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:
- Obsolete
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
ICL7665CSA FAQ
1.How can I place an order for ICL7665CSA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7665CSA 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 ICL7665CSA reliable?
The price and inventory of ICL7665CSA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7665CSA is usually 5 days.
3.What payment methods are accepted for ICL7665CSA?
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ICL7665CSA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7665CSA 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 ICL7665CSA?
For technical support, including ICL7665CSA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7665CSA requirements.
6.How does Aetrix verify that ICL7665CSA is sourced from the original manufacturer or authorized distributors?
All ICL7665CSA 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 ICL7665CSA meets industry standards.
7.What is the process for return or replacement of ICL7665CSA?
All ICL7665CSA units undergo pre-shipment inspection (PSI). If there is an issue with ICL7665CSA, 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 ICL7665CSA part is unused and in its original packaging.
Return procedure for ICL7665CSA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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