SN54AS867FK Datasheet PDF - TI

●description

●These synchronous, presettable, 8-bit up/down counters feature internal-carry look-ahead circuitry for cascading in high-speed counting applications. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincidentally with each other when so instructed by the count-enable (ENP, ENT) inputs and internal gating. This mode of operation eliminates the output counting spikes normally associated with asynchronous (ripple clock) counters. A buffered clock (CLK) input triggers the eight flip-flops on the rising (positive going) edge of the clock waveform.

●• Fully Programmable With Synchronous Counting and Loading

●• SN74ALS867A and ′AS867 Have Asynchronous Clear; SN74ALS869 and ′AS869 Have Synchronous Clear

●• Fully Independent Clock Circuit Simplifies Use

●• Ripple-Carry Output for n-Bit Cascading

●• Package Options Include Plastic

●   Small-Outline (DW) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (NT) and Ceramic (JT) 300-mil DIPs