74LV4799N,112

Overview

The 74LV4799N,112 is a low-voltage Si-gate CMOS control IC designed for NiCd and NiMH battery management. It operates on a supply voltage range of 0.9 V to 6 V, supporting 1 to 4-cell applications. The device integrates a precision oscillator, a 17-stage divider, and a 10-stage up/down counter to calculate battery capacity by measuring charge, discharge, and self-discharge times. Key features include automatic power-on reset, scan test facilities, and outputs for LED status indication and battery-low alerts. It supports various charger types, including switched-mode power supplies, with configurable timing parameters.

Feature Summary

• Wide supply voltage range of 0.9 V to 6 V allows for 1 to 4-cell battery applications.
• On-chip timer calculates actual battery capacity by measuring charge, discharge, and self-discharge times.
• Automatic switch-over to trickle charge mode after completion of the charge cycle.
• Includes scan test facilities for rapid testing of the internal divider and counter.

Applications

• Time-controlled NiCd and NiMH low-current chargers
• Domestic appliances such as rechargeable battery shavers and electric toothbrushes
• Portable equipment including notebook PCs, laptop PCs, and camera flash units
• Personal communications devices like cordless telephones and pagers

Procurement Notes

Verify component authenticity through authorized NXP distributors or certified suppliers. Confirm that the package matches the 16-Pin Plastic DIL specification (SOT38-4) and check for RoHS compliance documentation. Ensure storage conditions adhere to moisture sensitivity level 1 requirements to maintain device reliability prior to assembly.

Selection Notes

Select this component for applications requiring precise time-based battery charging management within a 0.9 V to 6 V supply range. Ensure external timing components (resistors and capacitors) are chosen within the specified ranges to maintain oscillator accuracy. Consider the 16-pin DIP package constraints for PCB layout if space permits, as it offers robust mechanical stability for industrial or domestic appliance designs.

Part Context

The 74LV4799 belongs to the 74LV series of low-voltage CMOS logic devices manufactured by Philips Semiconductors, now NXP USA Inc. This specific part number denotes the 16-pin Dual In-Line Package variant. It supersedes earlier data specifications from April 1998 and is categorized under integrated circuits for clock and timer applications, specifically tailored for battery charger control logic.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Users should consult official NXP documentation for potential cross-references or updated product line replacements.