CD54HC40103F

Counter Dividers Overview

The CD54HC40103F is an 8-stage synchronous down counter manufactured using high-speed silicon gate technology. It features a single active-low output that triggers when the internal count reaches zero. The device supports both synchronous and asynchronous preset operations, allowing data loading via P0-P7 inputs. Control inputs including Master Reset (MR), Preset Load (PL), Synchronous Enable (PE), and Terminal Count Enable (TE) are all active-low logic. The counter decrements on positive clock transitions and can be cascaded in synchronous or ripple modes.

Counter Dividers Feature Summary

• Supports synchronous or asynchronous preset functionality for flexible data initialization
• Capable of cascading in either synchronous or ripple counting modes
• Features balanced propagation delay and transition times for consistent timing performance
• Provides significant power reduction compared to Low Power Schottky TTL logic ICs

Counter Dividers Applications

• Synchronous digital counting systems requiring precise decrement sequences
• Cascaded multi-stage counters for extended bit-width applications
• Timing circuits utilizing the terminal count output for event triggering
• Systems requiring direct LSTTL input compatibility with CMOS outputs

Counter Dividers Procurement Notes

Verify the specific ordering suffix to confirm package type and environmental rating. The 'F' suffix indicates a ceramic dual-in-line package suitable for military or harsh environments. Confirm RoHS compliance status and moisture sensitivity level requirements against your assembly process specifications before finalizing procurement orders.

Counter Dividers Selection Notes

Select this component when an 8-bit synchronous down counter with active-low control signals is required. Choose the HC variant for wide voltage operation between 2V and 6V. Select the HCT variant if direct interface with LSTTL logic levels is necessary within a 4.5V to 5.5V supply range. Ensure the operating temperature range meets the application's thermal constraints.

Counter Dividers Part Context

This part belongs to the Texas Instruments High-Speed CMOS Logic family. It is functionally compatible with other 40103 series devices but distinguished by its military-grade ceramic packaging. The device shares architectural similarities with other 8-bit counters but offers specific control input precedence for reset and preset operations.

Counter Dividers Replacement Considerations

CD54HC40103F3A

Counter Dividers FAQ

How does the counter handle the preset operation?

The counter supports both synchronous and asynchronous preset modes. Data at the P0-P7 inputs is loaded asynchronously when the PL input is low, or synchronously on the next positive clock transition when the PE input is low.

What is the function of the TC output?

The Terminal Count (TC) output goes low when the internal count reaches zero, provided the TE input is low. This signal remains low for one full clock period and can be used for cascading or event triggering.