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
|Published (Last):||28 May 2011|
|PDF File Size:||1.43 Mb|
|ePub File Size:||10.2 Mb|
|Price:||Free* [*Free Regsitration Required]|
These synchronous, presettable counters feature an inter. Devices also available in Tape and Reel.
This synchronous clear allows the count length to. The carry output is decoded by means of a NOR gate, thus preventing spikes during the normal counting mode of operation. The clear function for the. Fairchild Semiconductor Electronic Components Datasheet.
The carry look-ahead circuitry provides for cascading. Datashheet is synchronous; and a low level at the clear.
74LS Datasheet(PDF) – Fairchild Semiconductor
These counters are fully programmable; that is, the outputs may be preset to either level. View PDF for Mobile. A buffered clock input triggers the. Changes made to control inputs enable P or T or load that will modify the operating mode have no effect until clocking occurs. These counters feature a fully independent clock circuit. 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.
This mode of operation eliminates the output counting.
The gate output is connected to the clear input to synchronously clear the counter to all low outputs. 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.
74LS Datasheet(PDF) – TI store
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. Instrumental in accomplishing this function. This high-level over- flow ripple carry pulse can be used to dztasheet successive cascaded stages.
This mode of operation eliminates the output counting spikes which are normally associated with asynchronous ripple clock counters. The ripple carry output thus 74le163 will produce a high. The carry output is decoded by means of.
A buffered clock input triggers the four flip-flops on the rising positive-going edge of the clock input waveform. The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without addi- tional gating. The function of the counter whether enabled, dis.
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. Synchronous operation is pro.
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.
The gate output is connected to the clear input to. These counters are fully programmable; that is, the outputs.
74LS163 Datasheet PDF
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 4-Bit Binary Counters.
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. Instrumental in accomplishing this function are two count-enable inputs and a ripple carry output.
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. Changes made to control inputs enable P or T or load that.