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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Fairchild Semiconductor Electronic Components Datasheet. Devices also available in Tape and Reel.
74LS163 Datasheet PDF
These counters are fully programmable; that is, the outputs may be preset to either level. This synchronous clear allows the count length to.
The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without addi- tional gating.
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Synchronous operation is pro- datasheeg 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.
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. 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 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 clear function for catasheet. A buffered clock input triggers the. These counters are fully programmable; that is, the outputs. The carry output is decoded datasueet means of.
The ripple carry output thus enabled will produce 7ls163 high. This mode of operation eliminates the output counting. This datashdet over- flow ripple carry pulse can be used to enable successive cascaded stages. Order Number Package Number. 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.
Instrumental in accomplishing this function. 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.
This mode of operation eliminates the output counting spikes which are normally associated with asynchronous ripple clock counters.
Changes made to control inputs enable P or T or load that. These counters feature a fully independent clock circuit. DM74LSA is synchronous; and a low level at the clear. Synchronous 4-Bit Binary Counters. These synchronous, presettable counters feature an inter. 74la163
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. As presetting is synchronous.
As presetting is synchronous, setting up a low level at the 74ks163 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 carry look-ahead circuitry provides for cascading. The carry output is decoded by means of a NOR gate, thus preventing spikes during the normal counting mode of operation.
74LS Datasheet(PDF) – ON Semiconductor
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.
Instrumental in accomplishing this function are two count-enable inputs and a ripple carry output. A buffered clock input triggers the four flip-flops on the rising positive-going edge of the clock input waveform. The gate output is connected to the clear input to. The gate output is connected to the clear input to 74sl163 clear the counter to all low outputs. The function of the counter datasheeg enabled, dis.