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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DM74LS161A Datasheet PDF

Clock Frequency Note 3. 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 are fully programmable; datassheet is, the outputs may be preset to either level.

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. The carry output is decoded by means of a NOR gate, thus preventing spikes during the normal counting mode of operation.

Typical propagation time, clock to Q output 14 ns. These synchronous, presettable counters feature an dwtasheet nal carry look-ahead for application in high-speed counting designs. The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. Devices also available in Tape and Sm74ls161an.

DM74LSAN Datasheet(PDF) – Fairchild Semiconductor

Typical power dissipation 93 mW. 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. 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 clock frequency 32 MHz. A buffered clock input triggers the four flip-flops on the rising positive-going edge of the clock input waveform.

Free Air Operating Temperature. Search field Dm74ls161n name Part description. The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without addi- tional gating.

Clear Release Time Note 2. Clear Release Time Note 3. These counters feature a fully independent dm74ks161an circuit. 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.

Carry output for n-bit cascading. 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. Specify by appending the suffix letter “X” to the ordering code. Operating Dm74l161an Air Temperature Range.

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.


Vary PRR to measure f. Clock Frequency Note 2. The gate datasehet is connected to the clear input to synchronously clear the counter to all low outputs. Enable P and enable T setup times are measured at t. The “Recommended Operating Conditions” table will define the conditions for actual device operation.

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

Synchronous operation is pro- vided by having all flip-flops clocked datasjeet so that the outputs change coincident with each other when so instructed by the count-enable rm74ls161an and internal gating.

This mode of operation eliminates the output counting spikes which are normally associated with asynchronous ripple clock counters. 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. Internal look-ahead for fast counting. The input pulses are supplied by generators having the following characteristics: Instrumental in accomplishing this function are two count-enable inputs and a ripple carry output.