74AC191PC

Counter Dividers Overview

The onsemi 74AC191PC is a synchronous reversible modulo 16 binary counter housed in a 16-PDIP package. It features asynchronous parallel presetting and operates within a supply voltage range of 2 V to 6 V. The device supports bidirectional counting with a typical maximum count frequency of 133 MHz at 5.0 V. Outputs are capable of sourcing or sinking 24 mA, facilitating direct interface capabilities. The component includes dedicated Terminal Count (TC) and Ripple Clock (RC) outputs for multistage expansion.

Counter Dividers Feature Summary

• Synchronous up/down counting triggered by the rising edge of the clock input
• Asynchronous parallel load capability allowing immediate presetting of any desired number
• Integrated Terminal Count and Ripple Clock outputs for simplified cascading

Counter Dividers Applications

• Programmable frequency dividers utilizing the preset feature
• Multistage counter implementations using ripple clock or gated carry methods
• Bidirectional event counting systems requiring direction control

Counter Dividers Procurement Notes

Verify the specific ordering code suffix against current manufacturer documentation, as availability may vary. Confirm that the PDIP package variant matches the required footprint for the target application. Ensure compliance with RoHS standards if applicable to the end product requirements. Check for obsolescence notices regarding this specific part number before finalizing procurement plans.

Counter Dividers Selection Notes

Select this component when a synchronous 4-bit reversible counter with asynchronous preset is required. The AC series offers high-speed performance suitable for frequencies up to 133 MHz. Consider the 24 mA output drive strength for direct interfacing with other logic families. Verify that the 2 V to 6 V operating voltage range aligns with the system power supply constraints.

Counter Dividers Part Context

This device belongs to the 74AC logic family, characterized by CMOS technology and high-speed operation. It serves as a fundamental building block for digital timing and sequencing applications. The 74AC191 specifically provides bidirectional counting capabilities, distinguishing it from unidirectional counters in the same series.

Counter Dividers Replacement Considerations

Public confirmed substitute part numbers: 74F191PC.