SN74ALS191ANS

Counter Dividers Overview

The SN74ALS191ANS is a synchronous 4-bit up/down binary counter from the Texas Instruments 74ALS series. It features positive-edge triggering and supports bidirectional counting via an Up/Down control input. The device operates within a supply voltage range of 4.5 V to 5.5 V and achieves a maximum count rate of 30 MHz. It is housed in a 16-SOIC package with a commercial operating temperature range of 0°C to 70°C.

Counter Dividers Feature Summary

• Synchronous 4-bit binary counting capability with independent Up/Down direction control
• Positive-edge triggered operation for precise timing synchronization
• High-speed performance supporting count rates up to 30 MHz

Counter Dividers Applications

• Digital frequency division circuits
• Time-base generation in digital clocks
• Position tracking in motor control systems

Counter Dividers Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm RoHS compliance status and check for obsolescence notices, as availability may be limited. Ensure the 16-SOIC package matches the target PCB footprint and validate electrical specifications against current design requirements before finalizing procurement.

Counter Dividers Selection Notes

Select this component when high-speed synchronous counting is required within standard TTL voltage levels. The ALS technology offers faster switching speeds compared to standard LS counterparts while maintaining compatible logic levels. Consider the 16-SOIC package for surface-mount assembly needs and verify that the 30 MHz maximum frequency meets the system's timing constraints.

Counter Dividers Part Context

This part belongs to the Texas Instruments 74ALS (Advanced Low-power Schottky) family, designed for applications requiring improved speed over standard LS logic. The SN74ALS191A variant specifically provides a 4-bit bidirectional counter function. It serves as a foundational building block for sequential logic designs in industrial and consumer electronics.

Counter Dividers Replacement Considerations

The SN74ALS191ADR is documented as a similar substitute part number by Texas Instruments.