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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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DM74LS161AN Datasheet

The function of the datasehet whether enabled, dis- abled, loading, or counting will be dictated solely by the conditions meeting the stable set-up and hold times. Clock Frequency Note 2. Changes made to control inputs enable P or T or load that will modify the operating mode have no effect until clocking occurs.

Dm74ls161zn Release Time Note 2. The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without addi- tional gating. The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. The device should not be operated at these limits. 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 3. Synchronous operation is pro- vided by having all flip-flops clocked datasbeet so that the outputs change coincident with each other when so instructed by the count-enable inputs and internal gating.


The carry output is decoded by means of a NOR gate, thus preventing spikes during the normal counting mode of operation. These datasueet are fully programmable; that is, the outputs may be preset to either level. This mode of operation eliminates the output counting spikes which are normally associated with asynchronous ripple clock counters.

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

Operating Free Air Temperature Range.

Index of /datasheet

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. Instrumental in accomplishing this function are two count-enable inputs and a ripple carry output. Typical clock frequency 32 MHz. The gate output is connected to the clear input to datawheet clear the counter to all low outputs. 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.

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

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

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 clear function dm74ls161na 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. Search field Part name Part description. The “Recommended Operating Conditions” table will define the conditions for actual device operation. Clock Frequency Note 3. The input pulses are supplied by generators having the following characteristics: These counters feature a fully independent clock circuit.

Carry output for n-bit cascading. Typical propagation time, clock to Q output 14 ns. Typical power dqtasheet 93 mW. Specify by appending the suffix letter “X” to the ordering code. A buffered clock input dm74ls16an the four flip-flops on the rising positive-going edge of the clock input waveform.

DM74LSAN Datasheet(PDF) – National Semiconductor (TI)

Internal look-ahead for fast counting. Devices also available in Tape and Reel. Free Air Operating Temperature.