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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74LS163 Datasheet PDF
These counters feature a fully independent clock circuit. These counters are fully programmable; that is, the outputs. The carry look-ahead circuitry provides for cascading. The function of the counter whether enabled, dis- abled, loading, or counting will be dictated solely by the 74lx163 meeting the stable set-up and hold times.
Changes made to control inputs enable P or T or load that. Order Number Package Number.
The carry output is decoded by means of. 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. As presetting is synchronous. This mode of operation eliminates the output counting spikes which are normally associated with asynchronous ripple clock counters. These synchronous, presettable counters feature an inter.
The carry output is decoded by means of a NOR gate, thus preventing spikes during the normal counting mode of operation. 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.
View PDF for Mobile. 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 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. This mode of operation eliminates the output counting. A buffered clock input triggers the. 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.
Synchronous operation is pro. Synchronous 4-Bit Binary Counters. The gate output is connected to the clear input to. Instrumental in accomplishing this function.
This high-level over- flow ripple carry pulse can be used to enable successive cascaded stages.
74LS Datasheet(PDF) – ON Semiconductor
Devices also available in Tape and Reel. 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.
Fairchild Semiconductor Electronic Components Datasheet. The function of the datashee whether enabled, dis. Changes made to control inputs enable P or T or load that will modify the operating mode have no effect until clocking occurs.
Features s Synchronously programmable s Internal look-ahead for fast counting s Carry output for vatasheet 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: These counters are fully programmable; that is, the outputs may be preset to either level. DM74LSA is synchronous; and a 74lls163 level at the clear.
A buffered clock input triggers the four flip-flops on the rising positive-going edge of the clock input waveform. The clear function for the.
74LS Datasheet(PDF) – Hitachi Semiconductor
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 datsheet pulse, regardless of the levels of the enable input. The gate output is connected to the clear input to synchronously clear the counter to all low outputs.
Instrumental in accomplishing this function are two count-enable inputs and a ripple carry output.