SN74LS390N

Counter Dividers Overview

The SN74LS390N is a dual 4-bit decade and binary counter integrated circuit manufactured by Texas Instruments. It belongs to the 74LS logic series and features asynchronous counting with negative-edge triggering. The device operates within a supply voltage range of 4.75 V to 5.25 V and supports a maximum clock rate of 35 MHz. It is housed in a 16-pin PDIP package designed for through-hole mounting, suitable for commercial temperature ranges from 0°C to +70°C.

Counter Dividers Feature Summary

• Contains two independent counters: one configured as a divide-by-two section and another as a divide-by-five or divide-by-eight section.
• Features asynchronous operation with negative-edge triggered inputs for flexible timing control.
• Includes dedicated reset inputs (R1, R2) and set inputs (S1, S2) for direct control of counter states.

Counter Dividers Applications

• Digital frequency division circuits
• Decimal counting systems
• Binary sequence generation

Counter Dividers Procurement Notes

Verify the specific ordering suffix against the manufacturer's current datasheet to ensure compatibility with required packaging and environmental specifications. Confirm that the component meets RoHS3 compliance standards if applicable to your assembly process. Cross-reference the part number with official Texas Instruments documentation to validate availability and production status before finalizing procurement plans.

Counter Dividers Selection Notes

Select this component when designing circuits requiring dual independent counters within a single package. Ensure the application operates within the specified 4.75 V to 5.25 V supply voltage range. Consider the asynchronous nature of the counter for timing-sensitive designs, as propagation delays may affect high-speed performance compared to synchronous alternatives.

Counter Dividers Part Context

This component is part of the Texas Instruments 74LS series, known for low-power Schottky logic. It serves as a fundamental building block for digital electronics, providing reliable counting functionality in various industrial and consumer applications. The SN74LS390N is widely used in educational kits and legacy system designs requiring decade or binary counting capabilities.

Counter Dividers Replacement Considerations

Compatible substitutes include SN74LS390 and SN54LS390. Verify pinout compatibility and electrical characteristics before substitution. Ensure the replacement part matches the required operating temperature range and package type for seamless integration into existing PCB layouts.