Part # 74LS193 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: 54LS193 DM54LS193 DM74LS193 Synchronous 4-Bit Up Down Binary Counters with Dual Clock


Part Details:

54LS193DM54LS193DM74LS193 June 1989 54LS193 DM54LS193 DM74LS193Synchronous 4-Bit Up Down BinaryCounters with Dual Clock General DescriptionThis circuit is a synchronous up down 4-bit binary counter These counters were designed to be cascaded without the Synchronous operation is provided by having all flip-flops need for external circuitry Both borrow and carry outputs clocked simultaneously so that the outputs change togeth- are available to cascade both the up and down counting er when so instructed by the steering logic This mode of functions The borrow output produces a pulse equal in operation eliminates the output counting spikes normally as- width to the count down input when the counter underflows sociated with asynchronous (ripple-clock) counters Similarly the carry output produces a pulse equal in width to The outputs of the four master-slave flip-flops are triggered the count down input when an overflow condition exists by a low-to-high level transition of either count (clock) input The counters can then be easily cascaded by feeding the The direction of counting is determined by which count input borrow and carry outputs to the count down and count up is pulsed while the other count input is held high inputs respectively of the succeeding counter Synchronous The counter is fully programmable that is each output maybe preset to either level by entering the desired data at the Features inputs while the load input is low The output will change Y Fully independent clear input independently of the count pulses This feature allows the Y Synchronous operation counters to be used as modulo-N dividers by simply modify- Y Cascading circuitry provided internally ing the count length with the preset inputs Y Individual preset each flip-flop A clear input has been provided which when taken to a high Y Alternate Military Aerospace device (54LS193) is avail- level forces all outputs to the low level independent of the able Contact a National Semiconductor Sales Office count and load inputs The clear count and load inputs are Distributor for specifications buffered to lower the drive requirements of clock drivers 4-Bit etc required for long words Connection Diagram UpDown Dual-In-Line Package Counters with Dual TL F 6406 ­ 1


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74LS193.pdf Datasheet