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Analog Devices Inc./Maxim Integrated ICL7665AEPA+
- Part No.:
- ICL7665AEPA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Supervisors
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ICL7665AEPA+.pdf
- Description:
- IC SUPERVISOR 2 CHANNEL 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:100
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Product details
Overview
ICL7665AEPA+ from Maxim Integrated is a dual over/undervoltage supervisor IC with precision internal 1.3V reference, two independent comparators, and open-drain N-channel outputs (OUT1/OUT2) plus open-drain P-channel hysteresis outputs (HYST1/HYST2). It operates from 2.0V to 16V supply, draws 3µA typical quiescent current, and provides 2% threshold accuracy at +25°C for VSET1. Used in battery-backed microprocessor systems for power-fail warning and brownout detection.
For engineers reviewing the ICL7665AEPA+ datasheet, ICL7665AEPA+ pinout, ICL7665AEPA+ application, or ICL7665AEPA+ equivalent, key selection criteria include its -40°C to +85°C industrial temperature range, externally programmable trip points via resistor dividers, on-board hysteresis outputs enabling noise-immune voltage monitoring, and compatibility with TTL-level interfacing when external pull-ups are applied.
Technical Context
The ICL7665AEPA+ integrates a bandgap-based 1.3V reference with two low-bias-current comparators, each driving complementary open-drain outputs: OUT1/OUT2 (N-channel sinks) and HYST1/HYST2 (P-channel sources tied to V+). Its trip points are set by external resistive dividers on SET1 and SET2 pins, with hysteresis controlled independently via HYST1/HYST2 feedback paths.
Propagation delay is typically 75µs; input bias current is <10nA, enabling high-impedance divider networks (<1µA total current). The device avoids destructive latchup through SCR-aware design, requiring input current limiting to ±0.5mA when voltages exceed (GND − 0.3V) or (V+ + 0.3V).
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 regulation |
| VSET1 Threshold Accuracy | ±2% at +25°C - enables precise undervoltage detection without trimming potentiometers |
| Quiescent Current | 3µA typical - extends battery life in portable and backup applications |
| Operating Temperature | -40°C to +85°C - qualified for industrial environments including automotive under-hood and telecom infrastructure |
| Output Type | Open-drain N-channel (OUT1/OUT2) and open-drain P-channel (HYST1/HYST2) - allows wire-OR logic and flexible level-shifting |
| Reference Voltage | 1.3V internal bandgap - stable, low-drift reference for both comparators, eliminating need for external reference |
| Input Bias Current | <10nA - permits use of >1MΩ resistor dividers, minimizing loading on monitored voltage rails |
Pinout & Package
ICL7665AEPA+ is housed in an 8-pin plastic DIP (dual in-line package) with 0.3-inch width, RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | N-channel open-drain output | Inverting output for first comparator; sinks current when VSET1 exceeds 1.3V; requires external pull-up for logic-high |
| 2 (HYST1) | P-channel open-drain hysteresis output | Noninverting hysteresis source tied to V+; provides positive feedback path to SET1 for adjustable hysteresis |
| 3 (SET1) | First comparator input | High-impedance node (bias <10nA) for resistor-divider input; trips at 1.3V reference |
| 4 (GND) | Analog ground reference | Common return for internal reference and comparator circuitry; must be low-impedance connection |
| 5 (SET2) | Second comparator input | Independent high-Z input for second voltage monitor; identical 1.3V trip threshold |
| 6 (HYST2) | P-channel open-drain hysteresis output | Noninverting hysteresis source tied to V+; provides positive feedback to SET2 |
| 7 (OUT2) | N-channel open-drain output | Inverting output for second comparator; active-low when VSET2 exceeds 1.3V |
| 8 (V+) | Positive supply rail | Power input for internal reference and comparators; also serves as source for HYST1/HYST2 outputs |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent voltage monitors | Enables simultaneous overvoltage (OUT1) and undervoltage (OUT2) detection on separate rails or thresholds |
| On-chip 1.3V precision reference | Eliminates external reference IC or Zener diode, reducing BOM count and layout area |
| Programmable hysteresis via HYST outputs | Allows user-defined hysteresis width using external resistors-prevents chatter near trip points in noisy environments |
| Ultra-low 3µA operating current | Supports multi-year operation on coin-cell batteries in always-on monitoring applications |
| SCR-latchup protected CMOS process | Includes design mitigations (current-limited inputs, voltage clamping) to prevent destructive latchup during supply sequencing |
Applications
| Microprocessor Power-Fail Warning | Battery Backup Switchover |
|---|---|
Use Scenario: Monitoring unregulated DC input to a 7805 regulator to warn of impending 5V rail collapse before brownout. IC Role / Device Role / Timing Role: ICL7665AEPA+ acts as a predictive power-fail detector, asserting OUT2 when raw input falls below 8.0V, providing ≥3.5ms warning before regulated output drops. Use Value: Prevents spurious writes to battery-backed CMOS memory by triggering write-protection logic prior to voltage violation. | Use Scenario: Automatically switching CMOS memory supply from +5V line power to 3V lithium backup cell when main power fails. IC Role / Device Role / Timing Role: ICL7665AEPA+ drives PNP transistor Q1 via OUT1 to connect/disconnect primary supply; second comparator monitors backup cell voltage. Use Value: Ensures continuous memory retention without manual intervention or external control logic. |
| Low-Battery Detection (NiCd) | Multi-Rail Power Supply Fault Monitor |
Use Scenario: Detecting discharge of a 6-cell NiCd "9V" battery (7.2V nominal) to prevent cell reversal damage. IC Role / Device Role / Timing Role: ICL7665AEPA+ configures OUT2 for low-battery warning at 6.0V (1V/cell), and OUT1 for load disconnect at 5.0V (1V × (6−1)), with asymmetric hysteresis (100mV/800mV). Use Value: Extends battery cycle life by enforcing safe discharge cutoff while providing early user alert. | Use Scenario: Simultaneous monitoring of +5V and +15V rails in industrial PLC power subsystems. IC Role / Device Role / Timing Role: ICL7665AEPA+ uses shared SET1 node with resistor network to detect coordinated undervoltage across both supplies; OUT1 asserts if either rail drops >10% or both drop >5%. Use Value: Reduces component count versus discrete supervisors while enabling fault isolation in redundant power architectures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-voltage-monitor applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV809E33DBZR | Single-channel 3.3V reset IC with fixed threshold; no programmable hysteresis or dual monitoring | Suitable only for single-rail reset generation, not dual over/undervoltage supervision | Select only when system requires simple power-on reset without adjustable thresholds or redundancy |
| MAX6326UR29D3+ | Single-supply 2.93V supervisor with 200ms reset timeout; no external trip programming or hysteresis control | Provides timed reset pulse but lacks independent over/undervoltage outputs and resistor-programmable thresholds | Choose when deterministic reset duration is required, not real-time voltage trend monitoring |
Compared with TLV809E33DBZR and MAX6326UR29D3+, the ICL7665AEPA+ uniquely supports two fully independent, resistor-programmable voltage thresholds with user-defined hysteresis-enabling custom over/undervoltage response curves impossible with fixed-threshold alternatives.
Availability
ICL7665AEPA+ is available at Aetrix Electronics and suitable for industrial embedded systems, battery-powered instrumentation, and telecom power management requiring stable component supply across extended temperature ranges.
Supply support for ICL7665AEPA+ 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, sensing, and interface applications in industrial, automotive, and communications markets.
The ICL7665AEPA+ belongs to Maxim's voltage supervisor product line, engineered specifically for low-power, high-accuracy monitoring of multiple supply rails in space- and energy-constrained systems.
FAQ
What is the guaranteed VSET1 threshold accuracy of ICL7665AEPA+ over its full operating temperature range?
The ICL7665AEPA+ guarantees VSET1 threshold accuracy of ±2.5% over the full -40°C to +85°C temperature range, based on electrical characterization data in the Maxim datasheet. At +25°C, accuracy tightens to ±2.0%. This specification applies only to the A-grade version and reflects worst-case deviation from the nominal 1.3V internal reference under varying supply and temperature conditions.
Can ICL7665AEPA+ monitor voltages higher than its V+ supply, such as 12V or 24V rails?
Yes, the ICL7665AEPA+ can monitor voltages significantly higher than its V+ supply using external resistor dividers on SET1 and SET2 pins. The device's input structure tolerates voltages up to (V+ + 0.3V) directly, but with proper scaling (e.g., 10:1 or 100:1 dividers), it safely monitors 12V, 24V, or even several hundred volts-provided input currents remain within ±0.5mA limits to avoid latchup.
How does the hysteresis function work on ICL7665AEPA+, and what design impact does it have?
Hysteresis on ICL7665AEPA+ is implemented via HYST1 and HYST2 pins, which source current to SET1/SET2 when their respective comparators trip. This raises the effective trip point for re-arm, creating a voltage window (e.g., 5.55V/5.45V) that prevents output oscillation due to noise or slow-moving transients. Designers select R31/R32 values per Maxim's application formulas to set desired hysteresis width without affecting nominal trip voltage.
Is ICL7665AEPA+ pin-compatible with earlier ICL7665C-grade DIP packages?
Yes, the ICL7665AEPA+ shares identical 8-pin DIP mechanical footprint and pinout with ICL7665CPA, ICL7665ACPA, and other C/E/I-grade variants. However, electrical differences exist: the 'A' grade improves VSET1 accuracy to ±2% at +25°C and guarantees performance across -40°C to +85°C, whereas 'C' grade is rated only from 0°C to +70°C with looser initial tolerance.
What is the maximum sink current capability of OUT1 and OUT2 on ICL7665AEPA+?
The OUT1 and OUT2 pins of ICL7665AEPA+ can each sink up to 25mA continuously, as specified in the Absolute Maximum Ratings table. In typical operation with TTL loads, they reliably drive ≥1 standard TTL input (1.6mA) with VOL ≤ 0.4V at V+ = 5V. Saturation voltage drops to 0.06V at V+ = 15V and IOUT = 2mA, confirming strong low-side switching capability.
ICL7665AEPA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 8-PDIP
ICL7665AEPA+ FAQ
1.How can I place an order for ICL7665AEPA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for ICL7665AEPA+ 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 ICL7665AEPA+ reliable?
The price and inventory of ICL7665AEPA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ICL7665AEPA+ is usually 5 days.
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4.How is shipping managed for ICL7665AEPA+?
ICL7665AEPA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ICL7665AEPA+ 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 ICL7665AEPA+?
For technical support, including ICL7665AEPA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ICL7665AEPA+ requirements.
6.How does Aetrix verify that ICL7665AEPA+ is sourced from the original manufacturer or authorized distributors?
All ICL7665AEPA+ 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 ICL7665AEPA+ meets industry standards.
7.What is the process for return or replacement of ICL7665AEPA+?
All ICL7665AEPA+ units undergo pre-shipment inspection (PSI). If there is an issue with ICL7665AEPA+, 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 ICL7665AEPA+ part is unused and in its original packaging.
Return procedure for ICL7665AEPA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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