DM74AS163N

Counter Dividers Overview

The DM74AS163N is a synchronous 4-bit binary counter from the AS series, manufactured by Fairchild Semiconductor. It features an internal carry look-ahead for high-speed counting applications and utilizes diode-clamped inputs. The device operates on a positive-going edge of the clock input, ensuring simultaneous flip-flop triggering to eliminate output counting spikes. It includes a load control line and a decoded carry output via a NOR gate to prevent spikes during normal operation. Packaged in a 16-lead Plastic Dual-In-Line (PDIP) format, it supports cascading for n-bit designs.

Counter Dividers Feature Summary

• Synchronous presettable design with internal carry look-ahead for fast counting
• Diode-clamped inputs to handle fast rise times
• Decoded carry output prevents spikes during normal counting mode
• Positive-edge triggered clocking eliminates ripple clock output spikes

Counter Dividers Applications

• High-speed counting designs requiring internal carry look-ahead
• Cascaded n-bit binary counting systems
• Digital systems requiring synchronous presettable counters

Counter Dividers Procurement Notes

Verify the package type matches the required 16-lead PDIP configuration. Confirm the manufacturer is Fairchild Semiconductor or authorized successor. Check RoHS compliance status as older AS series parts may vary. Ensure the specific suffix 'N' denotes the DIP package variant. Validate that the component meets the required TTL logic level specifications for the target application environment.

Counter Dividers Selection Notes

Select this component when synchronous operation is critical to avoid propagation delays associated with asynchronous counters. The internal carry look-ahead makes it suitable for high-frequency applications compared to standard LS series counters. Consider the 16-pin DIP package for through-hole prototyping or legacy board compatibility. Verify voltage supply ranges align with the system's 5V logic requirements.

Counter Dividers Part Context

This part belongs to the 74AS (Advanced Schottky) family, known for improved speed over standard TTL. It is functionally similar to other 4-bit synchronous counters but distinguished by its specific internal gating and carry decoding. The DM74AS163N is distinct from asynchronous counters like the 74LS93 or non-synchronous presettable variants.

Counter Dividers Replacement Considerations

• DM74AS163

Counter Dividers FAQ

How does the DM74AS163N handle carry signals for cascading?

It features an internal carry look-ahead and a decoded carry output generated by a NOR gate, which facilitates efficient cascading for n-bit counting applications while preventing output spikes.

What triggers the flip-flops in this counter?

All flip-flops are triggered simultaneously on the rising (positive-going) edge of the clock input waveform, ensuring synchronous operation.