* 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,
SN54LS669 Datasheet (213.91 KB)
SN54LS669
Motorola Inc
213.91 KB
Synchronous 4-bit up/down counter.
SYNCHRONOUS 4-BIT UP/DOWN COUNTER The SN54 / 74LS669 is a synchronous 4-bit up/down counter. The LS669 is a 4-bit binary counter. For high speed count.
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