DM74LSAN Synchronous 4-Bit Binary Counter With Asynchronous Clear. These synchronous, presettable counters feature an internal carry look-ahead for . DM74LSAN datasheet, DM74LSAN circuit, DM74LSAN data sheet: NSC – Synchronous 4-Bit Binary Counters,alldatasheet, datasheet, Datasheet. DM74LSAN datasheet, DM74LSAN circuit, DM74LSAN data sheet: FAIRCHILD – Synchronous 4-Bit Binary Counters,alldatasheet, datasheet.
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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.
Operating Free Air Temperature Range. The gate output is connected to the clear input to synchronously clear the counter to all low outputs. 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. Typical power dissipation 93 mW. Changes made to control inputs enable P or T or load that will modify the operating mode have no effect until clocking occurs.
Clock Frequency Note 3. The carry output is decoded by means of a NOR gate, thus preventing spikes during the normal counting mode of datasheett. Instrumental in accomplishing this function are two count-enable inputs and a ripple carry output. Search field Part name Part description. These counters are fully programmable; that is, the outputs may be preset to either level.
The dm74ls161qn should not be operated at these limits. 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.
The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The “Absolute Maximum Ratings” are those values dataxheet which the safety of the device cannot be guaranteed.
The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without addi- tional gating. Specify by appending the suffix letter “X” to the ordering code.
DM74LS161A Datasheet PDF
This mode of operation eliminates the output counting spikes which are normally associated with asynchronous ripple clock counters. Clock Frequency Note 2. This synchronous clear allows the datsaheet length to be modified easily, as decoding the maximum count desired can be accomplished with one external NAND gate. Free Air Operating Temperature.
DM74LSAN 데이터시트(PDF) – Fairchild Semiconductor
Clear Release Time Note 2. 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.
Enable P and enable T setup times are measured at t. Devices also available in Tape and Reel. These synchronous, presettable counters feature an inter- nal carry look-ahead for application in high-speed counting designs.
The clear function for the DM74LSA is synchronous; and cm74ls161an 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.
DM74LSAN Datasheet(PDF) – Fairchild Semiconductor
Carry datashete for n-bit cascading. A buffered clock input triggers the four flip-flops on the rising positive-going edge of the clock input waveform.
The “Recommended Operating Conditions” table will define the conditions for actual device operation. Clear Release Time Note 3.
Typical clock frequency 32 MHz. The input pulses are supplied by generators having the following characteristics: Typical propagation time, clock to Q output 14 ns. 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. Internal look-ahead for fast counting. Vary PRR to measure f. These counters feature a fully independent clock circuit.