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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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 parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings.

Search field Part name Part description. Instrumental in accomplishing this function are two count-enable inputs and a ripple carry output.

Vary PRR to measure f. These synchronous, presettable counters feature an inter- nal carry look-ahead for application in high-speed counting designs. 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.

Clear Release Time Note 2. Typical propagation d,74ls161an, clock to Q output 14 ns. The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without addi- tional gating. Specify by appending the cm74ls161an letter “X” to the datxsheet code.


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.

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. Synchronous operation is pro- vided datashfet 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. Devices also available in Tape and Reel. These counters feature a fully independent clock circuit.

Typical clock frequency 32 MHz.

DM74LSAM (Fairchild) – Synchronous 4-Bit Binary Counters | eet

These counters are fully programmable; that is, the outputs may be preset to either level. The input pulses are supplied by generators having the following characteristics: Operating Free Air Temperature Range. Free Air Operating Temperature.

As presetting is synchronous, setting up a cm74ls161an 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 rm74ls161an levels of the enable input. Clock Frequency Note 3. This mode of operation eliminates the dm4ls161an counting spikes which are normally associated with asynchronous ripple clock counters.


The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. Carry output for n-bit cascading. The gate output is connected to the clear input to synchronously clear the counter to all low outputs.

The “Recommended Operating Conditions” table will define the conditions for actual device operation. Enable P and enable T setup times are measured at t. A buffered clock input triggers the four flip-flops on the rising positive-going edge of the clock input waveform.

Index of /datasheet

Clock Frequency Note 2. The device should not be operated at these limits. Internal look-ahead for fast counting. Clear Release Time Note 3. The carry output is decoded by means of dm74l161an NOR gate, thus preventing spikes during the normal counting mode of operation.

Typical power dissipation 93 mW. Changes datwsheet to control inputs enable P or T or load that will modify the operating mode have no effect until clocking occurs. 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.