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74LS191M Hoja de datos - Fairchild Semiconductor

Número de piezaDescripción (Función)Fabricante
74LS191M Synchronous 4-Bit Binary Counters Fairchild
Fairchild Semiconductor Fairchild
74LS191M PDF Hoja de datos : 74LS191M pdf   
DM74LS191N image

General Description
The DM74LS191 circuit is a synchronous, reversible, up/down counter. Synchronous operation is provided by having all flip-flops clocked simultaneously, so that the outputs change simultaneously when so instructed by the steering logic. This mode of operation eliminates the output counting spikes normally associated with asynchronous (ripple clock) counters.

Features
■ Counts binary
■ Single down/up count control line
■ Count enable control input
■ Ripple clock output for cascading
■ Asynchronously presettable with load control
■ Parallel outputs
■ Cascadable for n-bit applications
■ Average propagation delay 20 ns
■ Typical clock frequency 25 MHz
■ Typical power dissipation 100 mW

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