Analog Devices Inc./Maxim Integrated ICL7665BCTV

Overview

ICL7665BCTV from Maxim Integrated is a dual over/undervoltage microprocessor supervisor IC with two independently programmable comparators, 1.3V internal bandgap reference, and open-drain N-channel OUT1/OUT2 plus open-drain P-channel HYS1/HYS2 outputs. It operates from 1.6V to 10V supply, draws 2.5–10µA typical quiescent current, and supports external resistor programming of trip points above 1.3V for battery-backed memory supervision and power-fail detection in portable systems.

For engineers reviewing the ICL7665BCTV datasheet, ICL7665BCTV pinout, ICL7665BCTV application, or ICL7665BCTV equivalent, this page delivers verified electrical parameters, TO-99 package terminal mapping, real-world hysteresis implementation guidance, and validated alternative parts for voltage monitoring in low-power embedded systems requiring brownout protection and dual-threshold fault signaling.

Technical Context

The ICL7665BCTV integrates a precision 1.3V CMOS bandgap reference with two independent low-bias-current comparators. Each comparator's SET input accepts externally divided voltages, triggering at 1.3V threshold; hysteresis is implemented via HYST outputs sourcing current into the divider network. Propagation delay is 75µs typical, enabling fast response to supply transients without excessive current draw.

Its dual-output architecture supports wire-OR configurations: OUT1/OUT2 sink current (open-drain N-ch), while HYST1/HYST2 source current (open-drain P-ch tied to V+). This allows flexible interface with TTL inputs (with pull-up) and direct connection to microcontroller NMI or reset lines, supporting both overvoltage warning and undervoltage shutdown in single-supply or multi-rail systems.

Key Specifications

Pinout & Package

ICL7665BCTV uses an 8-pin TO-99 metal can package with case connected to V+. Pin 1 is identified by tab orientation; leads are arranged clockwise from tab.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-threshold voltage monitoring applications.

Compared with TLV809E33DBZR and MAX6326XR31D3+, the ICL7665BCTV uniquely supports independent over/undervoltage detection with user-defined thresholds and active hysteresis - essential for battery management, multi-rail fault monitoring, and noise-immune power sequencing where fixed-threshold supervisors fall short.

Availability

ICL7665BCTV is available at Aetrix Electronics and suitable for microprocessor voltage monitoring, battery backup switchover, and AC power-fail warning applications requiring stable component supply and long-term industrial availability.

Supply support for ICL7665BCTV 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 in industrial, automotive, and communications markets.

The ICL7665 family was engineered specifically for ultra-low-power voltage supervision in battery-critical systems, combining dual comparators, internal reference, and hysteresis control in monolithic CMOS to replace discrete supervisory circuits.

FAQ

What is the supply voltage range for the ICL7665BCTV?

The ICL7665BCTV operates from 1.6V to 10V, as specified in its Electrical Characteristics table for the 'B' grade. This range supports direct connection to common battery chemistries (Li-ion, NiCd) and regulated rails (3.3V, 5V), with derating applied outside 1.8V–10V at temperature extremes. The ICL7665BCTV maintains full functionality across this window without external regulators.

How does the ICL7665BCTV implement hysteresis?

The ICL7665BCTV implements hysteresis using dedicated P-channel open-drain outputs (HYST1 and HYST2) that source current into the external resistor divider networks connected to SET1 and SET2. When a comparator trips, its corresponding HYST pin activates, altering the effective divider ratio to shift the opposite trip point - creating a defined voltage gap (e.g., 100mV) between turn-on and turn-off thresholds. This prevents oscillation near critical voltages without requiring external components.

Can the ICL7665BCTV monitor voltages higher than its supply voltage?

Yes, the ICL7665BCTV 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 device's input structure tolerates voltages from (GND − 0.3V) to (V+ + 0.3V), so the divider must ensure the SET pin voltage never exceeds this range. For example, a 100:1 divider enables monitoring of 100V inputs while presenting only 1V to the SET pin.

What is the function of the TO-99 case connection on the ICL7665BCTV?

The TO-99 metal can case of the ICL7665BCTV is internally connected to the V+ pin (pin 5), as confirmed in the Chip Topography section. This provides enhanced thermal conduction and EMI shielding but requires mechanical mounting to the same potential as the positive supply rail. Floating or grounding the case may cause malfunction or latchup; it must be electrically tied to V+ through the PCB footprint or heatsink interface.

Does the ICL7665BCTV have guaranteed temperature performance like the ICL7665A?

No, the ICL7665BCTV does not guarantee 2% threshold accuracy over temperature like the ICL7665A. Its VSET1/VSET2 specifications are ±150mV at +25°C (min/max bounds), with no extended-temp accuracy guarantee. The 'B' grade is optimized for cost-sensitive commercial applications where moderate accuracy suffices, whereas the 'A' grade adds tighter initial tolerance and characterized drift for industrial or extended-temperature use cases.