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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The function of the counter whether enabled, dis. The ripple carry output thus enabled will produce a high- level output pulse with a duration approximately equal to the high-level portion of the Q A output.
These synchronous, presettable counters feature an inter. These counters are fully programmable; that is, the outputs may be preset to either level.
The carry output is decoded by means of a NOR gate, thus preventing spikes during the normal counting mode of operation. A buffered clock input triggers the.
The gate output is connected datzsheet the clear input to synchronously clear the counter to all low outputs. Fairchild Semiconductor Electronic Components Datasheet. The carry output is decoded by means of.
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 4-Bit Binary Counters. As presetting is synchronous.
(PDF) 74LS163 Datasheet download
The clear function for the. Order Number Package Number. The gate output is connected to the clear input to. This mode of operation eliminates the output counting spikes which are normally associated with asynchronous ripple clock counters.
Instrumental in accomplishing this function. The ripple carry output thus enabled will produce a high. These counters are fully programmable; that is, the outputs. Changes made to control inputs enable P or T or load that. This high-level over- flow ripple carry pulse can be used to enable successive cascaded stages. View PDF for Mobile. This synchronous clear allows the count length to.
Changes made to control inputs enable P or T or load that will modify the operating mode have no effect until clocking occurs. The carry look-ahead circuitry provides for cascading. 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.
The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without addi- tional gating. The clear function for the DM74LSA is asynchro- nous; and a 47ls163 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.
Synchronous operation is pro- vided by having all flip-flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the count-enable inputs and internal gating.
As presetting is synchronous, setting up a low level at the load dataheet 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.
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: Synchronous operation is pro.
The function of the counter whether enabled, dis- abled, loading, or counting will ratasheet dictated solely by the conditions meeting the stable set-up and hold datasjeet.
74LS Datasheet(PDF) – Fairchild Semiconductor
DM74LSA is synchronous; and a low level at the clear. A buffered clock input triggers the four flip-flops on the rising positive-going edge of the clock input waveform.
Instrumental in accomplishing this function are two count-enable inputs and a datawheet carry output. This mode of operation eliminates the output counting. Devices also available in Tape and Reel.