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HD74LS669

Renesas
Part Number HD74LS669
Manufacturer Renesas
Description Synchronous Up / Down 4-bit Binary Counter
Published Dec 4, 2017
Detailed Description HD74LS669 Synchronous Up / Down 4-bit Binary Counter REJ03D0493–0200 Rev.2.00 Feb.18.2005 This synchronous preset tab...
Datasheet PDF File HD74LS669 PDF File

HD74LS669
HD74LS669

Overview
HD74LS669 Synchronous Up / Down 4-bit Binary Counter REJ03D0493–0200 Rev.
2.
00 Feb.
18.
2005 This synchronous preset table 4-bit binary counter features an internal carry look-ahead for cascading in high-speed counting applications.
Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable inputs and internal gating.
This mode of operation helps eliminate the output counting spikes that are normally associated with asynchronous (ripple-clock) counters.
A buffered clock input trigger the four master-slave flip-flops on the rising (positive-going) edge of the clock waveform.
This counter is fully programmable; that is, the outputs may each be preset to either level.
the load input circuitry allows loading with the carry-enable output of cascaded counters.
As loading is synchronous, setting up a low level at the load input disables the counter and causes the outputs to ag...


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