SN74ALS161BDR Datasheet PDF - TI

●description

●These synchronous, presettable, 4-bit decade and binary counters feature an internal carry look-ahead circuitry for application in high-speed counting designs. The SN54ALS162B is a 4-bit decade counter. The ’ALS161B, ’ALS163B, ’AS161, and ’AS163 devices are 4-bit binary counters. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincidentally with each other when 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 four flip-flops on the rising (positive-going) edge of the clock input waveform.

●• Internal Look-Ahead Circuitry for Fast Counting

●• Carry Output for n-Bit Cascading

●• Synchronous Counting

●• Synchronously Programmable

●• Package Options Include Plastic

●   Small-Outline (D) and Shrink Small-Outline

●   (DB) Packages, Ceramic Chip Carriers (FK),

●   Standard Plastic (N) and Ceramic (J) DIPs