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Analog Devices Inc./Maxim Integrated ICL7665IJA
- Part No.:
- ICL7665IJA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
ICL7665IJA.pdf
- Description:
- IC SUPERVISOR MPU VOLT MONITOR
- Quantity:
- Payment:
- Shipping:
Inventory:1,456
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Product details
Overview
ICL7665IJA from Maxim Integrated is a dual over/undervoltage microprocessor supervisor IC featuring two independently programmable voltage detectors, 3µA typical quiescent current, 1.6V–16V supply range, and operation across –20°C to +85°C. It monitors system supply rails or external voltages ≥1.3V using external resistor dividers and delivers open-drain N-channel OUT1/OUT2 and open-drain P-channel HYS1/HYS2 outputs for fault signaling and hysteresis control in battery-backed embedded systems.
For engineers reviewing the ICL7665IJA datasheet, ICL7665IJA pinout, ICL7665IJA application, or ICL7665IJA equivalent, this device supports precise power-rail monitoring with externally adjustable thresholds, low-power brownout detection, and TTL-compatible output drive-critical for reliable reset generation, NMI assertion, and backup switchover in industrial and portable electronics.
Technical Context
The ICL7665IJA integrates a precision 1.3V bandgap reference, two high-impedance comparators (input bias <10nA), and complementary open-drain outputs: OUT1/OUT2 (N-channel sinks) and HYS1/HYS2 (P-channel sources tied to V+). Its trip points are set by external resistive dividers on SET1/SET2 pins, enabling threshold programming from 1.3V up to hundreds of volts.
Hysteresis is implemented via current-source outputs (HYS1/HYS2) that inject current into the divider network-shifting only the lower trip point while preserving upper-trip accuracy. Propagation delay is 75µs typical, and supply sensitivity of VSET is ≤0.004%/V, ensuring stable detection under varying V+ conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.6V to 16V - supports wide-input battery and line-powered systems without external regulation |
| Quiescent Current | 3µA typical - enables multi-year operation on coin-cell or primary batteries |
| Operating Temperature | –20°C to +85°C - qualified for extended industrial environments |
| Threshold Accuracy (ICL7665A variant) | ±2% at +25°C - not applicable to ICL7665IJA; base ICL7665 grade has ±115mV VSET1/VSET2 tolerance |
| Input Trip Voltage (VSET1/VSET2) | 1.15V–1.45V / 1.20V–1.40V - fixed internal 1.3V comparator reference enables external resistor-based scaling |
| Output Type | Open-drain N-channel (OUT1/OUT2) and open-drain P-channel (HYS1/HYS2) - supports wire-OR, level-shifting, and programmable hysteresis |
| Max Sink/Source Current | 25mA sink (OUT1/OUT2), –25mA source (HYS1/HYS2) - drives multiple TTL loads or MOSFET gates directly |
Pinout & Package
CERDIP-8 package (0.300" wide, J8-2 drawing), hermetically sealed ceramic dual-in-line with metal lid; suitable for high-reliability, moisture-sensitive, and extended-temperature applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: OUT1 | Inverting open-drain N-channel output | Asserts low when SET1 > 1.3V; sinks up to 25mA; requires external pull-up for logic-high |
| 2: OUT2 | Inverting open-drain N-channel output | Asserts low when SET2 > 1.3V; independent of OUT1; supports dual-rail monitoring |
| 3: SET2 | Noninverting comparator input | Accepts voltage-divided monitor signal; bias current <10nA enables MΩ-range dividers |
| 4: SET1 | Noninverting comparator input | Primary undervoltage/overvoltage sense node; identical electrical behavior to SET2 |
| 5: V+ | Positive supply terminal | Power input (1.6–16V); also serves as source for HYS1/HYS2 P-channel outputs |
| 6: GND | Ground reference | Analog and digital ground; substrate tied to V+, requiring careful PCB layout per SCR latchup guidelines |
| 7: HYS1 | Open-drain P-channel hysteresis output | Sources current to SET1 divider when OUT1 is low; sets hysteresis width via R31 |
| 8: HYS2 | Open-drain P-channel hysteresis output | Sources current to SET2 divider when OUT2 is low; fully independent hysteresis path |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage detectors | Enables simultaneous overvoltage (OUT1) and undervoltage (OUT2) monitoring on separate rails or thresholds |
| Externally programmable trip points | Resistor-divider configuration allows threshold setting from 1.3V to >100V without trimming or calibration |
| On-board hysteresis outputs (HYS1/HYS2) | Eliminates need for external hysteresis components; reduces BOM count and layout area |
| Monolithic low-power CMOS design | 3µA typical supply current enables always-on supervision in energy-constrained IoT and portable devices |
| Robust output drive capability | 25mA sink and 25mA source support direct interface to TTL, CMOS, optocouplers, and small-signal MOSFETs |
Applications
| Power-Fail and Brownout Detection | Battery Backup Switching |
|---|---|
Use Scenario: Monitoring unregulated DC input to a 7805 regulator to generate early warning before 5V rail collapse. IC Role / Device Role / Timing Role: ICL7665IJA compares raw input voltage against 8.0V threshold (via SET1) and asserts OUT1 to trigger power-fail interrupt prior to regulator dropout. Use Value: Provides ≥3.5ms warning time before 5V output decay, preventing data corruption in microcontroller memory writes. | Use Scenario: Automatic switchover from main +5V supply to 3V lithium backup cell when main rail falls below 3.5V. IC Role / Device Role / Timing Role: ICL7665IJA's OUT1 controls PNP pass transistor gate; OUT2 monitors lithium cell voltage and lights low-battery LED at 2.6V. Use Value: Ensures continuous CMOS memory operation during AC loss while preventing deep discharge damage to backup battery. |
| Low-Battery Detection | Microprocessor Voltage Monitoring |
Use Scenario: Detecting end-of-discharge in a 6-cell NiCd "9V" battery (7.2V nominal) used in portable test equipment. IC Role / Device Role / Timing Role: ICL7665IJA configures SET2 for 6.0V warning threshold and SET1 for 5.0V disconnect threshold, each with tailored hysteresis. Use Value: Prevents cell reversal by disconnecting load at 1V/cell–1, extending battery cycle life and avoiding permanent capacity loss. | Use Scenario: Supervising core 3.3V and I/O 5V rails in an industrial PLC controller to ensure µP operates within spec during startup and brownout. IC Role / Device Role / Timing Role: ICL7665IJA uses one detector for 3.3V undervoltage (OUT2) and second for 5V overvoltage (OUT1), feeding OR'd signal to µP NMI pin. Use Value: Guarantees deterministic reset/assertion of non-maskable interrupt before supply excursions cause undefined µP behavior or memory corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage-monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6326US31D3+ | Single-supply reset IC with fixed 3.08V threshold; no dual-detector or hysteresis programming | Only suitable for single-rail reset generation; lacks independent over/undervoltage detection | Select when only basic 3.3V supply supervision is needed and board space is constrained |
| TLV809E33DBZR | Single-channel 3.3V supervisor with 200ms reset timeout; no external threshold adjustment or hysteresis control | Provides timed reset pulse but cannot monitor arbitrary voltages or implement custom hysteresis | Choose for simple, low-cost reset-only function where timing consistency matters more than flexibility |
Compared with MAX6326US31D3+ and TLV809E33DBZR, the ICL7665IJA uniquely supports two independently programmable voltage thresholds, user-defined hysteresis via external resistors, and operation down to 1.6V supply-making it irreplaceable for multi-rail, wide-range, or battery-critical monitoring where adaptability and ultra-low quiescent current are mandatory.
Availability
ICL7665IJA is available at Aetrix Electronics and suitable for industrial control systems, battery-powered instrumentation, and telecom infrastructure requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ICL7665IJA 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 demanding industrial, automotive, and communications applications.
The ICL7665 product line delivers ultra-low-power, dual-threshold voltage supervisors targeting battery longevity and reliability in embedded systems where supply integrity must be continuously verified without compromising energy budget.
FAQ
What is the operating temperature range of the ICL7665IJA?
The ICL7665IJA is rated for –20°C to +85°C operation, making it suitable for extended-temperature industrial environments. This range is confirmed in the Ordering Information table and Absolute Maximum Ratings section of the official Maxim datasheet. Unlike the C-grade (0°C to +70°C) or E-grade (–40°C to +85°C) variants, the ICL7665IJA specifically targets intermediate industrial use cases where enhanced thermal margin beyond commercial grade is required without full automotive qualification. The CERDIP package contributes to its stability across this range.
Does the ICL7665IJA include an internal voltage reference?
Yes, the ICL7665IJA integrates a precision 1.3V bandgap reference used by both comparators. This reference is monolithically trimmed and stable over temperature (100ppm/°C typical), eliminating the need for external references. All threshold programming is performed by scaling external input voltages-via resistor dividers-to match this fixed 1.3V trip point at the SET1 and SET2 pins. The reference is shared between both detectors and is not user-adjustable.
Can the ICL7665IJA monitor voltages higher than its supply voltage (V+)?
Yes, the ICL7665IJA 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 only see the divided-down voltage, which must remain within GND–0.3V to V++0.3V per Absolute Maximum Ratings. This architecture enables high-side rail monitoring (e.g., 24V, 48V) while operating from a low-voltage auxiliary supply, a key capability confirmed in the General Description and Typical Operating Circuit sections.
What package type does the ICL7665IJA use, and why is it significant?
The ICL7665IJA uses an 8-pin CERDIP (ceramic dual-in-line package), designated J8-2 in Maxim's packaging nomenclature. This hermetically sealed ceramic package provides superior moisture resistance, thermal stability, and long-term reliability compared to plastic DIP or SO packages-critical for aerospace, military, and high-reliability industrial deployments. Its 0.300" width matches standard DIP footprints, enabling drop-in replacement in legacy designs requiring enhanced environmental robustness.
How does hysteresis work on the ICL7665IJA, and which pins control it?
Hysteresis on the ICL7665IJA is implemented via dedicated open-drain P-channel outputs HYS1 and HYS2 (pins 7 and 8), which source current into the external resistor dividers connected to SET1 and SET2. When OUT1 or OUT2 goes low, the corresponding HYS pin activates, injecting current that lowers the effective trip point-creating a defined gap (hysteresis width) between upper and lower thresholds. This prevents output chatter near the trip voltage and is fully configurable using external resistors (R31/R32), as detailed in Figures 4 and 5 of the datasheet. No internal hysteresis is present; all control is external and per-channel.
ICL7665IJA 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:
- -20°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-CERDIP
ICL7665IJA FAQ
1.How can I place an order for ICL7665IJA through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7665IJA 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 ICL7665IJA reliable?
The price and inventory of ICL7665IJA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7665IJA is usually 5 days.
3.What payment methods are accepted for ICL7665IJA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ICL7665IJA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ICL7665IJA?
ICL7665IJA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7665IJA 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 ICL7665IJA?
For technical support, including ICL7665IJA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7665IJA requirements.
6.How does Aetrix verify that ICL7665IJA is sourced from the original manufacturer or authorized distributors?
All ICL7665IJA 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 ICL7665IJA meets industry standards.
7.What is the process for return or replacement of ICL7665IJA?
All ICL7665IJA units undergo pre-shipment inspection (PSI). If there is an issue with ICL7665IJA, 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 ICL7665IJA part is unused and in its original packaging.
Return procedure for ICL7665IJA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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