These synchronous presettable counters feature an inter- nal carry look-ahead for application in high-speed counting designs The LSA and LSA are. SN74LSADR. SOIC. D. Q1. SN74LSANSR. SO. NS. Q1. Texas Instruments 74LS Counter ICs are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Texas Instruments 74LS
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These counters are fully programmable; that is, the outputs. A buffered clock input triggers the. Changes made to control inputs enable P or T or load that.
The carry output is decoded by means of a NOR gate, thus preventing spikes during the normal counting mode of operation. As presetting is dataaheet.
This mode of operation eliminates the output counting spikes which are normally associated with asynchronous ripple clock counters. Synchronous operation is pro. This high-level over- flow ripple carry pulse can be used to enable successive cascaded stages.
A buffered clock input triggers the four flip-flops on the rising positive-going edge of the clock input waveform. Features s Synchronously programmable s Internal look-ahead for fast counting s Carry output for n-bit cascading s Synchronous counting s Load control line s Diode-clamped inputs s Typical propagation time, clock to Q output 14 ns s Typical clock frequency 32 MHz s Typical power dissipation 93 mW Ordering Code: Changes made to control inputs enable P or T or load that will modify the operating mode have no effect until clocking occurs.
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. DM74LSA is synchronous; and a low level at the clear. These counters are fully programmable; that is, the outputs may be preset to either level.
The ripple carry output datasjeet enabled will produce a high- level output pulse with a duration approximately equal to the high-level portion of the Q A output. The ripple carry output thus enabled will produce a high.
74LS Datasheet(PDF) – TI store
The function of the counter whether enabled, dis. This synchronous clear allows the count length to be modified easily, as decoding the maximum count desired can be accomplished with one external NAND gate.
These synchronous, presettable counters feature an inter.
The carry look-ahead circuitry provides for cascading. Instrumental in accomplishing this function.
The function of the counter whether enabled, dis- abled, loading, or counting will be dictated solely by the conditions meeting the stable set-up and hold times. Order Number Package Number. The clear function for the DM74LSA is asynchro- nous; and a low level at the clear input sets all four of the flip-flop outputs LOW, regardless of the levels of clock, load, or enable inputs. These counters feature a fully independent clock circuit.
The clear function for the. This mode of operation eliminates the output counting.
Instrumental in accomplishing this function are two count-enable inputs and a ripple carry output. The clear function for the DM74LSA is synchronous; and a low level at the clear inputs sets all four of the flip-flop outputs LOW after the next clock pulse, regardless of the levels of the enable inputs. Synchronous operation is pro- vided by having all flip-flops clocked simultaneously so datssheet the outputs change coincident with each other when so instructed by the count-enable inputs and internal gating.
The carry look-ahead circuitry provides 744ls163 cascading counters for n-bit synchronous applications without addi- tional gating. This synchronous clear allows the count length to. The carry output is decoded by means of.
The gate output is connected to the clear input to. Fairchild Semiconductor Electronic Components Datasheet. View PDF for Mobile. Synchronous 4-Bit Binary Counters. Devices also available in Tape and Reel. The gate output is connected to the clear input to synchronously clear the counter to all low outputs.