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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:1,732
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Product details
Overview
ICL7665CSA+ from Maxim Integrated is a dual over/undervoltage microprocessor supervisor IC with two independently programmable voltage detectors, 3µA typical quiescent current, 1.6V–16V supply range, and on-board hysteresis outputs. 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 power-OK signaling and battery backup switching in portable systems.
For engineers reviewing the ICL7665CSA+ datasheet, ICL7665CSA+ pinout, ICL7665CSA+ application, or ICL7665CSA+ equivalent, this page provides verified technical context, exact pin functions, real-world use cases in low-battery detection and power-fail warning circuits, and validated alternative parts for voltage monitoring designs requiring <10µA supply current and dual-threshold detection.
Technical Context
The ICL7665CSA+ 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)-all operating within a single monolithic CMOS die. Its trip points are set externally via resistor dividers on SET1/SET2 pins, enabling detection of voltages from 1.3V up to several hundred volts.
Propagation delay is typically 75µs; hysteresis is implemented by feeding HYSTx outputs back into the divider network to shift lower trip thresholds without affecting upper thresholds. The device avoids destructive latchup via SCR protection design rules, requiring input current limiting to ±0.5mA when VSET exceeds (GND −0.3V) or (V+ +0.3V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.6V to 16V - supports direct operation from Li-ion, 5V, 9V, and 12V rails without regulation. |
| Quiescent Current | 3µA typical - enables multi-year battery life in coin-cell-powered voltage monitors. |
| Reference Voltage | 1.3V internal bandgap - sets comparator trip point; stable over temperature (100ppm/°C typical). |
| Output Types | Two open-drain N-ch (OUT1/OUT2) + two open-drain P-ch (HYST1/HYST2) - allows wire-OR logic and TTL-level interfacing with pull-ups. |
| Input Leakage | ±0.01nA to ±10nA - permits use of >10MΩ external resistors without accuracy loss. |
| Propagation Delay | 75µs typical - ensures timely response to brownout/fail events before system reset. |
| Operating Temp | 0°C to +70°C - qualified for commercial-grade embedded and industrial control applications. |
Pinout & Package
ICL7665CSA+ uses an 8-pin SO (Small Outline) package, RoHS-compliant and lead-free, with 1.27mm pitch and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | N-channel open-drain output | Inverting output for first detector; sinks current when VSET1 > 1.3V; drives TTL with external pull-up. |
| 2 (HYST1) | P-channel open-drain hysteresis output | Noninverting source tied to V+; supplies hysteresis current to SET1 divider when OUT1 active. |
| 3 (SET1) | Comparator 1 input | High-impedance node (≤10nA leakage); voltage divider input for first threshold; trip at 1.3V. |
| 4 (GND) | Analog ground reference | Return path for internal reference and comparator circuitry; must be low-impedance. |
| 5 (SET2) | Comparator 2 input | Independent high-Z input for second detector; trip also at 1.3V; supports separate undervoltage monitoring. |
| 6 (HYST2) | P-channel open-drain hysteresis output | Noninverting source tied to V+; supplies hysteresis current to SET2 divider when OUT2 active. |
| 7 (OUT2) | N-channel open-drain output | Inverting output for second detector; sinks current when VSET2 > 1.3V; used for low-battery or power-fail alerts. |
| 8 (V+) | Positive supply input | Power rail for internal reference, comparators, and outputs; absolute max 18V; substrate tied to V+. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage detectors | Enables simultaneous overvoltage (e.g., 5.55V) and undervoltage (e.g., 4.45V) monitoring on same IC - reduces BOM count vs. two discrete supervisors. |
| Externally programmable thresholds | SET1/SET2 accept resistor-divided inputs ≥1.3V - supports monitoring of 3.3V, 5V, 12V, or HV rails without level-shifting. |
| On-board hysteresis outputs | HYS1/HYS2 provide dedicated current sources to implement precise hysteresis - eliminates need for external op-amps or comparators. |
| Ultra-low quiescent current | 3µA typical - extends battery life in always-on monitoring circuits (e.g., IoT sensor nodes, medical wearables). |
| Monolithic CMOS construction | 38-transistor die with integrated reference and comparators - ensures matched temperature drift and eliminates external component drift errors. |
Applications
| Power-Fail Warning | Battery Backup Switching |
|---|---|
Use Scenario: Monitoring unregulated DC input to a 7805 regulator to warn of AC line failure before 5V output collapses. IC Role / Device Role / Timing Role: ICL7665CSA+ acts as a predictive power-fail detector, asserting OUT2 when raw input drops below 8.0V - providing ≥3.5ms warning before 5V decay begins. Use Value: Prevents spurious writes to battery-backed CMOS memory by triggering write-protection logic prior to brownout. | Use Scenario: Swapping main +5V supply to a 3V lithium backup cell when line power fails. IC Role / Device Role / Timing Role: ICL7665CSA+ OUT1 controls PNP transistor Q1; turns off main supply path at 3.5V and enables backup path - ensuring uninterrupted memory retention. Use Value: Eliminates need for external power-path controllers or discrete MOSFET drivers in compact backup systems. |
| Low-Battery Detection | Microprocessor Voltage Monitoring |
Use Scenario: Detecting NiCd battery discharge to 6.0V (1V/cell × 6 cells) with 100mV hysteresis to avoid false alarms during transient load dips. IC Role / Device Role / Timing Role: ICL7665CSA+ SET2 monitors battery voltage via resistor divider; OUT2 asserts low at 6.0V to light LED or interrupt µP - hysteresis prevents chatter near threshold. Use Value: Protects rechargeable batteries from deep discharge damage while minimizing current draw (<3µA) during idle monitoring. | Use Scenario: Ensuring microprocessor operates only within guaranteed 4.5V–5.5V supply range; generating NMI or reset signal on violation. IC Role / Device Role / Timing Role: ICL7665CSA+ configures OUT1 for overvoltage (5.55V trip) and OUT2 for undervoltage (4.45V trip); outputs wire-OR'd to generate POWER_OK. Use Value: Replaces discrete Zener + comparator solutions with single IC, reducing layout area and improving trip accuracy (±50mV total window). |
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 |
|---|---|---|---|
| MAX6326US29D3+ | Single-supply reset IC with fixed 2.93V threshold; no dual-detector capability; 1.5µA quiescent current. | Only suitable for single-rail monitoring; lacks independent over/undervoltage detection and hysteresis outputs. | Select only if monitoring one voltage rail with tight tolerance and ultra-low current is primary requirement. |
| TPS3808G12DBVR | Adjustable watchdog timer + voltage supervisor; 1.2V–6.0V adjustable threshold; 12µA quiescent current; no hysteresis outputs. | Includes watchdog function but requires external hysteresis components; higher supply current limits battery life. | Choose when system-level watchdog timeout is needed alongside voltage monitoring - not for pure dual-threshold detection. |
Compared with MAX6326US29D3+ and TPS3808G12DBVR, the ICL7665CSA+ uniquely delivers true dual independent voltage detection with integrated hysteresis sourcing/sinking outputs and sub-10µA operation - making it optimal for space-constrained, battery-sensitive designs requiring both over- and undervoltage supervision on separate rails.
Availability
ICL7665CSA+ is available at Aetrix Electronics and suitable for power-fail warning, battery backup switching, low-battery detection, and microprocessor voltage monitoring requiring stable component supply across commercial temperature ranges.
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, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The ICL7665CSA+ belongs to Maxim's legacy voltage supervisor product line, engineered specifically for ultra-low-power dual-threshold monitoring in battery-operated and line-powered systems where size, current budget, and reliability are critical.
FAQ
What is the maximum input voltage that can be monitored by the ICL7665CSA+?
The ICL7665CSA+ itself operates from 1.6V to 16V, but its SET1 and SET2 inputs can monitor voltages from 1.3V up to several hundred volts using external high-value resistor dividers. The key constraint is that the voltage at the SET pin must remain within (GND −0.3V) to (V+ +0.3V) to avoid latchup; thus, proper scaling and current limiting (≤0.5mA) are required for high-voltage monitoring. The ICL7665CSA+ datasheet confirms operation with VIN up to hundreds of volts when properly configured.
Does the ICL7665CSA+ have built-in hysteresis, or must it be added externally?
The ICL7665CSA+ provides dedicated hysteresis outputs (HYST1 and HYST2) - open-drain P-channel sources referenced to V+ - which are designed to be fed back into the external resistor dividers on SET1 and SET2. This enables precise, user-programmable hysteresis without external op-amps or comparators. The hysteresis magnitude depends on resistor values and is calculated per Maxim's Application Note - the ICL7665CSA+ does not include fixed internal hysteresis.
Can the ICL7665CSA+ drive a standard TTL input directly?
Yes, the ICL7665CSA+ OUT1 and OUT2 outputs are open-drain N-channel sinks capable of driving at least one TTL load with VOL ≤0.4V when an external pull-up resistor is used. At V+ = 5V and IOUT = 2mA, saturation voltage is 0.10–0.30V - well within TTL logic-low specification. HYST1/HYST2 are P-channel sources and require connection to V+ to pull high; they do not drive TTL directly but enable hysteresis feedback.
What is the temperature coefficient of the internal 1.3V reference in the ICL7665CSA+?
The ICL7665CSA+ internal bandgap reference has a typical temperature coefficient of 100ppm/°C, including comparator offset drift. This value is specified across the full operating temperature range (0°C to +70°C) and ensures stable trip-point accuracy without external trimming. The ICL7665CSA+ datasheet states this tempco applies to both VSET1 and VSET2 thresholds under all grades.
Is the ICL7665CSA+ pin-compatible with the ICL7665CPA or ICL7665CJA packages?
Yes, the ICL7665CSA+, ICL7665CPA, and ICL7665CJA share identical 8-pin functionality and electrical specifications - differing only in package type (SO, PDIP, CERDIP). Pin 1 is OUT1, Pin 2 is HYST1, Pin 3 is SET1, Pin 4 is GND, Pin 5 is SET2, Pin 6 is HYST2, Pin 7 is OUT2, and Pin 8 is V+. All three variants maintain the same pinout, timing, and DC characteristics, allowing drop-in replacement across package types.
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:
- 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:
- 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+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7665CSA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7665CSA+?
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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