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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Enable P and enable T dm74ps161an times are measured at t. 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. Internal look-ahead for fast counting. The input pulses are supplied by generators having the following characteristics: Operating Free Air Temperature Range.

Index of /datasheet

Clear Release Time Note 3. Clock Frequency Note 3.

Clock Frequency Note 2. 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. Typical power dissipation 93 mW.

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. The gate output is connected to the clear input to synchronously clear the counter to all low outputs.

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DM74LSAN Datasheet pdf – Synchronous 4-Bit Binary Counters – Fairchild Semiconductor

These counters are fully programmable; that is, the outputs may be preset to either level. Clear Release Time Note 2. Search field Part name Part description.

Vary PRR to measure f. The carry look-ahead circuitry datashest 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.

DM74LSAN Datasheet(PDF) – National Semiconductor (TI)

The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. The device should not be operated at these limits.

These synchronous, presettable counters feature an inter- nal carry look-ahead for application in high-speed counting designs. The function of the counter whether enabled, dis- abled, loading, or datasheeet will be dictated solely by the conditions meeting the stable set-up and hold times.

A buffered clock input triggers the four flip-flops on the rising positive-going edge of the clock input waveform. Typical propagation time, clock to Q output 14 ns.

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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. Datashset carry output is decoded by means of a NOR gate, thus preventing spikes during the normal counting mode of operation. The “Recommended Operating Conditions” table will define the conditions for actual device operation.

Changes made to control inputs enable P or T or load that will modify the operating mode have no effect until clocking occurs. Specify datasneet appending the suffix letter “X” to the ordering code. Instrumental in accomplishing this function are two count-enable inputs and a ripple carry output.

Typical clock frequency 32 MHz. 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.

Carry output for n-bit cascading.

Fairchild Semiconductor

Devices also available in Tape and Reel. These counters feature a fully independent clock circuit. Free Air Operating Temperature.