SN74ALS867ADWR

Counter Dividers Overview

The SN74ALS867ADWR is a synchronous 8-bit up/down counter manufactured by Texas Instruments in the ALS logic family. It features internal-carry look-ahead circuitry for high-speed cascading and accepts parallel data inputs for presettable operation between 0 and 255. The device utilizes a buffered clock input that triggers flip-flops on the rising edge, eliminating output counting spikes associated with asynchronous counters. It includes two count-enable inputs (ENP, ENT) and a ripple-carry output (RCO) to facilitate n-bit expansion without additional gating. The component operates within a supply voltage range of 4.5 V to 5.5 V and supports a maximum clock frequency of 35 MHz.

Counter Dividers Feature Summary

• Synchronous operation ensures simultaneous flip-flop triggering to eliminate counting spikes.
• Internal carry look-ahead circuitry enables efficient cascading for multi-bit applications.
• Fully programmable architecture allows parallel loading of any value from 0 to 255.
• Buffered clock input simplifies system design by minimizing transmission-line effects.

Counter Dividers Applications

• High-speed binary counting sequences
• Frequency division circuits
• Digital timing control systems
• Cascaded multi-stage counter designs

Counter Dividers Procurement Notes

Verify the specific suffix 'DW' corresponds to the Plastic Small-Outline package configuration required for your PCB layout. Confirm RoHS compliance status as indicated in the manufacturer's ordering information. Ensure the operating temperature range aligns with your environmental specifications. Cross-reference the datasheet revision date to confirm parameter validity against your design requirements.

Counter Dividers Selection Notes

Select this component when synchronous counting with minimal propagation delay skew is required. The ALS series offers a balance of speed and power consumption suitable for general-purpose digital logic. Consider the asynchronous clear feature unique to the SN74ALS867A variant if immediate reset capability is necessary compared to the synchronous clear found in other variants.

Counter Dividers Part Context

This device belongs to the Texas Instruments SN74ALS/AS logic family, designed for high-speed digital applications. It is part of a broader series of synchronous counters that includes variants like the SN74ALS869 and SN74AS867. These components share similar architectural principles but differ in clear mechanisms and electrical characteristics tailored for specific performance needs.

Counter Dividers Replacement Considerations

SN74ALS869DW serves as a direct functional substitute with synchronous clear capabilities instead of asynchronous clear. SN74AS867DW provides higher speed performance within the same package format. Verify pin compatibility and electrical parameters before substituting to ensure system integrity.