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Analog Devices Inc./Maxim Integrated ICL7665BCJA
- Part No.:
- ICL7665BCJA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
ICL7665BCJA.pdf
- Description:
- IC SUPERVISOR MPU VOLT MONITOR
- Quantity:
- Payment:
- Shipping:
Inventory:440
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Product details
Overview
ICL7665BCJA from Maxim Integrated is a dual over/undervoltage microprocessor monitor IC with precision internal 1.3V reference, two open-drain N-channel outputs (OUT1/OUT2), and two open-drain P-channel hysteresis outputs (HYST1/HYST2). It operates from 1.6V to 10V supply, draws only 3µA typical quiescent current, and supports externally programmable trip points ≥1.3V for battery-backed systems requiring low-power voltage supervision.
For engineers reviewing the ICL7665BCJA datasheet, ICL7665BCJA pinout, ICL7665BCJA application, or ICL7665BCJA equivalent, this device delivers verified dual-threshold detection with ±50mV VSET1–VSET2 mismatch, 100ppm/°C trip-point tempco, and TTL-compatible output drive capability-critical for power-fail warning, brownout detection, and battery switchover circuits where supply current and threshold accuracy are design-critical.
Technical Context
The ICL7665BCJA integrates a bandgap-based 1.3V reference with two independent comparators, each feeding dedicated open-drain N-channel (sink) and P-channel (source) outputs. Its architecture enables simultaneous high-side and low-side voltage monitoring via external resistor dividers on SET1 and SET2 pins, with hysteresis programmable through HYST1/HYST2 connections to V+.
Unlike single-threshold supervisors, the ICL7665BCJA provides true dual-direction supervision: OUT1 inverts on overvoltage (VSET1 > 1.3V), while OUT2 asserts on undervoltage (VSET2 < 1.3V); both outputs support wire-OR configurations and tolerate input voltages up to several hundred volts when used with appropriate external resistors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.6V to 10V - supports operation from single Li-ion cell up to industrial 9V rails without external regulation |
| Quiescent Current | 3µA typical - enables multi-year battery life in always-on voltage monitoring applications |
| VSET Threshold Accuracy | ±0.15V at +25°C (VSET1: 1.15–1.45V, VSET2: 1.20–1.40V) - allows precise trip-point setting without calibration |
| Temperature Coefficient | 100 ppm/°C - ensures ≤±10mV drift over 0°C to +70°C operating range |
| Output Drive Capability | 25mA sink (OUT1/OUT2), –25mA source (HYST1/HYST2) - directly drives LEDs, optocouplers, or TTL inputs with pull-up |
| Propagation Delay | 75µs typical - fast enough for real-time power-fail response before system reset |
| Input Leakage Current | ±10nA max - permits use of >10MΩ external divider resistors without accuracy loss |
Pinout & Package
ICL7665BCJA is housed in an 8-pin CERDIP (Ceramic Dual In-line Package) with 0.300" width, hermetically sealed for high-reliability industrial and military applications. Pin 1 is identified by a notch or dot; pin numbering follows standard DIP convention (counterclockwise from top-left corner).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | Inverting N-channel open-drain output | Sinks current when VSET1 exceeds 1.3V - used for overvoltage alarm or NMI assertion |
| 2 (HYST1) | P-channel open-drain hysteresis output | Sources current to V+ when VSET1 > 1.3V - enables programmable hysteresis via external resistor to GND |
| 3 (SET1) | Noninverting comparator input | Accepts attenuated input voltage; comparator trips when voltage = 1.3V - sets overvoltage threshold |
| 4 (GND) | Analog/digital ground reference | Common return for reference, comparators, and outputs - must be low-impedance for stable threshold accuracy |
| 5 (SET2) | Noninverting comparator input | Accepts second attenuated input; trips at 1.3V - sets undervoltage threshold independently of SET1 |
| 6 (HYST2) | P-channel open-drain hysteresis output | Sources current to V+ when VSET2 < 1.3V - enables hysteresis for undervoltage detection |
| 7 (OUT2) | Noninverting N-channel open-drain output | Sinks current when VSET2 falls below 1.3V - used for low-battery or power-fail warning |
| 8 (V+) | Positive supply input | Power rail for internal reference and comparators - 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 SET1/SET2 thresholds |
| On-board hysteresis outputs | HYST1/HYST2 eliminate noise-induced chatter without external components - reduces BOM count vs discrete solutions |
| Externally programmable trip points | Supports any threshold ≥1.3V using two-resistor dividers - eliminates need for multiple fixed-threshold parts |
| Monolithic low-power CMOS design | 3µA typical supply current enables direct integration into battery-powered systems without burdening energy budget |
| Open-drain N/P-channel outputs | Allows flexible interfacing: OUT1/OUT2 sink to GND; HYST1/HYST2 source to V+ - supports mixed-voltage logic domains |
Applications
| Power-Fail Warning | Battery Backup Switching |
|---|---|
Use Scenario: Monitoring unregulated DC input to a 7805 regulator to generate early warning before 5V output collapses. IC Role / Device Role / Timing Role: ICL7665BCJA acts as a predictive power supervisor - OUT2 triggers at 3.9V to halt memory writes before brownout. Use Value: Provides ≥3.5ms warning time before 5V rail failure, preventing data corruption in CMOS battery-backup memory. | Use Scenario: Automatic switchover from line-powered +5V to 3V lithium backup when main supply drops below 3.5V. IC Role / Device Role / Timing Role: ICL7665BCJA's OUT1 controls PNP pass transistor Q1 - turns off main supply path and enables backup path. Use Value: Ensures zero-interruption power to critical CMOS memory during AC outage or battery depletion events. |
| Low-Battery Detection | High/Low Temperature Alarm |
Use Scenario: Detecting NiCd battery discharge to 6V (1V/cell × 6 cells) with 100mV hysteresis to avoid false alarms. IC Role / Device Role / Timing Role: ICL7665BCJA functions as a precision voltage threshold detector - OUT2 asserts low when battery falls below set point. Use Value: Prevents NiCd cell reversal damage by triggering disconnect at 5V (1V × (6−1)), with 800mV hysteresis to suppress cycling. | Use Scenario: Using an NPN transistor's VBE (−5mV/°C) as temperature sensor with adjustable high/low limits. IC Role / Device Role / Timing Role: ICL7665BCJA serves as dual-comparator temperature window detector - SET1/SET2 compare scaled VBE to 1.3V reference. Use Value: Enables low-cost, self-contained thermal alarm without dedicated temperature ICs - supports field-adjustable trip points via potentiometers. |
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 and 200ms reset timeout; no dual-threshold or hysteresis programming | Only suitable for basic power-on reset, not over/undervoltage supervision or analog threshold detection | Select only if application requires simple reset generation without programmable trip points or dual-direction monitoring |
| TLV809E29DBZR | Single-channel 2.93V supervisor with push-pull output; lacks second detector, hysteresis outputs, and external threshold programming | Cannot replace dual-monitoring function - requires two devices plus external circuitry to approximate ICL7665BCJA behavior | Choose only for cost-sensitive, single-threshold applications where dual detection and hysteresis are unnecessary |
Compared with MAX6326US29D3+ and TLV809E29DBZR, the ICL7665BCJA uniquely integrates two independently programmable comparators, on-chip hysteresis control, and ultra-low 3µA supply current - making it irreplaceable for compact, battery-efficient dual-threshold supervision where external resistor networks define custom trip points.
Availability
ICL7665BCJA is available at Aetrix Electronics and suitable for power-fail warning, battery backup switching, and low-battery detection applications requiring stable component supply across extended production lifecycles.
Supply support for ICL7665BCJA 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 industrial, automotive, and communications markets, emphasizing low-power, high-reliability performance.
The ICL7665 family was engineered specifically for microprocessor voltage supervision - delivering dual over/undervoltage detection, programmable thresholds, and sub-10µA operation in rugged CERDIP and TO-99 packages for mission-critical systems.
FAQ
What is the operating supply voltage range for the ICL7665BCJA?
The ICL7665BCJA operates from 1.6V to 10V, as specified for the 'B' grade version. This range supports direct connection to single-cell Li-ion (3.0–4.2V), 5V logic rails, and 9V industrial supplies without external regulators. Operation below 1.6V risks reference instability, while exceeding 10V violates the absolute maximum rating for the ICL7665B variant - always verify V+ against the Electrical Characteristics table for ICL7665BCJA.
How does the ICL7665BCJA implement hysteresis, and what external components are required?
The ICL7665BCJA implements hysteresis using its HYST1 and HYST2 pins, which are open-drain P-channel outputs tied to V+. When a comparator trips, the corresponding HYST pin sources current into an external resistor connected to GND, shifting the effective threshold downward. For example, adding R31 between HYST1 and GND creates hysteresis on the OUT1 channel. No additional op-amps or comparators are needed - the ICL7665BCJA integrates all hysteresis control circuitry internally.
Can the ICL7665BCJA monitor voltages higher than its supply voltage?
Yes, the ICL7665BCJA can monitor input voltages significantly higher than V+, including several hundred volts, using external resistor dividers on SET1 and SET2. The internal comparators only see the divided-down voltage - as long as the divider ensures the SET pin voltage stays within (GND − 0.3V) to (V+ + 0.3V), and input current is limited to ±0.5mA per Absolute Maximum Ratings, high-voltage supervision is fully supported. This makes ICL7665BCJA suitable for telecom and industrial power supply monitoring.
What is the guaranteed accuracy of the trip voltage for ICL7665BCJA over temperature?
The ICL7665BCJA guarantees a trip voltage tempco of 100 ppm/°C, resulting in ≤±10mV total drift over its 0°C to +70°C operating range. While initial accuracy at +25°C is ±0.15V (VSET1: 1.15–1.45V), the dominant error contributor over temperature is the 100 ppm/°C coefficient - confirmed in the Electrical Characteristics table. This level of stability eliminates need for external trimming in most industrial applications.
Is the ICL7665BCJA RoHS-compliant?
No, the ICL7665BCJA is not RoHS/lead-free compliant. Per Maxim's official part number table, the ICL7665BCJA carries "RoHS/Lead-Free: No" status and uses leaded solder in its CERDIP package. For RoHS-compliant alternatives, consider the ICL7665ACSA+ (8-SO, lead-free) or ICL7665AEPA+ (8-PDIP, lead-free), though these differ in temperature range and package type - verify full specifications before substitution.
ICL7665BCJA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Monitor
- Number of Voltages Monitored:
- 2
- Voltage - Threshold:
- Adjustable/Selectable
- Output:
- Open Drain or Open Collector
- Reset:
- -
- Reset Timeout:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
ICL7665BCJA FAQ
1.How can I place an order for ICL7665BCJA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7665BCJA 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 ICL7665BCJA reliable?
The price and inventory of ICL7665BCJA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7665BCJA is usually 5 days.
3.What payment methods are accepted for ICL7665BCJA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7665BCJA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7665BCJA?
ICL7665BCJA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7665BCJA 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 ICL7665BCJA?
For technical support, including ICL7665BCJA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7665BCJA requirements.
6.How does Aetrix verify that ICL7665BCJA is sourced from the original manufacturer or authorized distributors?
All ICL7665BCJA 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 ICL7665BCJA meets industry standards.
7.What is the process for return or replacement of ICL7665BCJA?
All ICL7665BCJA units undergo pre-shipment inspection (PSI). If there is an issue with ICL7665BCJA, 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 ICL7665BCJA part is unused and in its original packaging.
Return procedure for ICL7665BCJA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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