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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Operating Free Air Temperature Range.
Instrumental in accomplishing this function dataasheet two count-enable inputs and a ripple carry output. 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 dm74lx161an and hold times. 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.
Clock Frequency Note 3. Clear Release Time Note 2.
Vary PRR to measure f. Clock Frequency Note 2. The input pulses are supplied by generators having the following characteristics: The parametric values defined in the Electrical Characteristics tables are not guaranteed at the absolute maximum ratings. These counters feature a fully independent clock circuit. Devices also available in Tape and Reel.
These synchronous, presettable counters feature an inter- nal carry look-ahead for application in high-speed counting daasheet.
DM74LSAM (Fairchild) – Synchronous 4-Bit Binary Counters | eet
Search field Part name Part description. The carry output is decoded by means of a NOR gate, thus preventing spikes during the normal counting mode of operation. Typical power dissipation 93 mW. 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.
Specify by appending the suffix letter “X” to datashwet ordering code. Changes made to control inputs enable P or T or load that will modify the operating mode have no effect until clocking occurs.
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.
Free Air Operating Temperature.
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.
A buffered clock input triggers the four flip-flops on the rising positive-going edge of datxsheet clock input waveform.
The “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. Clear Release Time Note 3. Carry output for n-bit cascading. The “Recommended Operating Conditions” table will define the conditions for actual device operation. Internal look-ahead for fast counting. The device should not be operated at these limits. Typical clock frequency 32 Datasueet.
The gate output is connected to the clear input to synchronously clear the counter to all low outputs. The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without addi- tional gating. 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.
This mode of operation eliminates the output counting spikes which are normally associated with asynchronous ripple clock counters. These counters are fully programmable; that is, the outputs may be preset to either level. Enable P and enable T setup times are measured at t. 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.