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SN74LS669 - SYNCHRONOUS 4-BIT UP/DOWN COUNTER

Download the SN74LS669 datasheet PDF. This datasheet also covers the SN74LS669D variant, as both devices belong to the same synchronous 4-bit up/down counter family and are provided as variant models within a single manufacturer datasheet.

Features

  • an internal carry lookahead for cascading purposes. By clocking all flip-flops simultaneously so the outputs change coincident with each other (when instructed to do so by the count enable inputs and internal gating) synchronous operation is provided. This helps to eliminate output counting spikes, normally associated with asynchronous (ripple-clock) counters. The four master-slave flip-flops are triggered on the rising (positive-going) edge of the clock waveform by a buffered clock input. Circu.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (SN74LS669D_MotorolaInc.pdf) that lists specifications for multiple related part numbers.

📁 Similar Datasheet

Part Number Description Manufacturer
SN74LS669 SYNCHRONOUS 4-BIT UP/DOWN COUNTER Texas Instruments
SN74LS668 SYNCHRONOUS 4-BIT UP/DOWN COUNTER Texas Instruments
SN74LS620 Octal Bus Transceiver Texas Instruments
SN74LS621 Octal Bus Transceiver Texas Instruments
SN74LS623 Octal Bus Transceiver Texas Instruments

Other Datasheets by Motorola Semiconductor (now NXP Semiconductors)

Part Number Description
SN74LS623 OCTAL BUS TRANSCEIVER
SN74LS640 OCTAL BUS TRANSCEIVERS
SN74LS641 OCTAL BUS TRANSCEIVERS
SN74LS642 OCTAL BUS TRANSCEIVERS
SN74LS645 OCTAL BUS TRANSCEIVERS

Full PDF Text Transcription

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SYNCHRONOUS 4-BIT UP/DOWN COUNTER SN54/74LS669 The SN54 / 74LS669 is a synchronous 4-bit up/down counter. The LS669 is a 4-bit binary counter. For high speed counting applications, this presettable counter features an internal carry lookahead for cascading purposes. By clocking all flip-flops simultaneously so the outputs change coincident with each other (when instructed to do so by the count enable inputs and internal gating) synchronous operation is provided. This helps to eliminate output counting spikes, normally associated with asynchronous (ripple-clock) counters. The four master-slave flip-flops are triggered on the rising (positive-going) edge of the clock waveform by a buffered clock input.
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