Counter Single 4-Bit Binary UP/Down 16-Pin CDIP Tube

The ’ALS193A are synchronous, reversible, 4-bit up/down binary counters. Synchronous counting operation is provided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when instructed by the steering logic. This mode of operation eliminates the output counting spikes normally associated with asynchronous (rippleclock) counters.The outputs of the four flip-flops are triggered on a low-to-high-level transition of either count/clock (UP or DOWN) input. The direction of the count is determined by which count input is pulsed while the other count input is high.

• Look-Ahead Circuitry Enhances Cascaded Counters
• Fully Synchronous in Count Modes
• Parallel Asynchronous Load for Modulo-N Count Lengths
• Asynchronous Clear
• Package Options Include Plastic Small-Outline (D) Packages, Ceramic Chip Carriers (FK), and Standard Plastic (N) and Ceramic (J) 300-mil DIPs