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HD74HC668 - Synchronous UP/Down Decade/4-bit binary Counter

General Description

This synchronous presettable decade counter

Key Features

  • an internal carry look-ahead for cascading in highspeed counting.

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📁 Similar Datasheet

Part Number Description Manufacturer
HD74HC668 Synchronous UP/Down Decade Counter Renesas
HD74HC669 Synchronous Up/Down 4-bit binary Counter Renesas
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HD74HC623 Octal Bus Transceivers Renesas
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Other Datasheets by Hitachi Semiconductor (now Renesas)

Part Number Description
HD74HC669 Synchronous UP/Down Decade/4-bit binary Counter
HD74HC620 Octal Bus Transceivers
HD74HC623 Octal Bus Transceivers
HD74HC640 Octal Bus Transceivers
HD74HC643 Octal Bus Transceivers

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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HD74HC668/HD74HC669 Synchronous UP/Down Decade Counter Synchronous Up/Down 4-bit binary Counter Description This synchronous presettable decade counter features an internal carry look-ahead for cascading in highspeed 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 countenable 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 triggers 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.