Synchronous 4-bit Counters - National Semiconductor

These synchronous, presettable Counters DM54161 DM74161 DM74163 feature an inter- nal carry look-ahead for application in high-speed counting designs. The 161 and 163 are 4-bit binary Counters The carry output is decoded by means of a NOR Gate thus pre- venting spikes during the normal counting mode of opera- tion. Synchronous operation is provided by having all flip- flops clocked simultaneously so that the outputs change co- incident with each other when so instructed by the count- enable inputs and internal gating. This mode of operation eliminates the output counting spikes which are normally associated with asynchronous (ripple clock) Counters A buffered Clock input triggers the four Flip-Flops on the rising (positive-going) edge of the Clock input waveform. These Counters are fully programmable; that is, the outputs may be preset to either level. As presetting is synchronous, setting up a low level at the load input disables the Counter and causes the outputs to agree with the setup data after the next Clock pulse, regardless of the levels of the enable input. The clear function for the 161 is asynchronous; and a low level at the clear input sets all four of the Flip-Flop out- puts low, regardless of the levels of Clock load, or enable inputs. The clear function for the 163 is synchronous; and a low level at the clear input sets all four of the Flip-Flop out- puts low after the next Clock pulse, regardless of the levels of the enable inputs. This synchronous clear allows the count length to be modified easily, as decoding the maxi- mum count desired CAN be accomplished with one external NAND Gate The Gate output is connected to the clear input to synchronously clear the Counter to all low out- puts. Low-to-high transitions at the clear input of the 163 are also permissible, regardless of the Logic levels on the Clock enable, or load inputs. By National Semiconductor Corporation
Part Manufacturer Description Datasheet Samples
DM54161AJ/883C Rochester Electronics LLC Binary Counter,
DM54161AW/883C Rochester Electronics LLC Binary Counter,
DM54161J/883 Rochester Electronics LLC Binary Counter, TTL/H/L Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, TTL, CDIP16, CERAMIC, DIP-16
DM54161AJ/883 Rochester Electronics LLC Binary Counter, TTL/H/L Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, TTL, CDIP16, CERAMIC, DIP-16
DM54161W/883 Rochester Electronics LLC Binary Counter, TTL/H/L Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, TTL, CDFP16, CERPACK-16
DM54161AJ Rochester Electronics LLC Binary Counter,
DM54161 's PackagesDM54161 's pdf datasheet
DM74161
DM74163




DM54161 Pinout, Pinouts
DM54161 pinout,Pin out
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