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These synchronous, presettable counters feature an inter- nal carry look-ahead for application in high-speed counting designs. The DM74LSA and. 74LS Synchronous 4-bit Binary Counters. These synchronous, presettable counters feature an internal carry look-ahead for application in high-speed. System Logic Semiconductor 74LS datasheet, Synchronous 4 Bit Counters; Binary/ Direct Reset (3-page), 74LS datasheet, 74LS pdf, 74LS

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Reset outputs to zero.

744ls161 Load, clock or enable T Reset. Not more than one output should be shorted at a time, and the duration should not exceed one second. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change conicident with each other when so instructed by the count-enable inputs and internal gating.

Fairchild Semiconductor

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.

Low Level Input Current. Propagation Delay, Reset to Any Q. Functional operation should be restricted to the Recommended Operating Conditions.

74LS Datasheet(PDF) – Fairchild Semiconductor

This mode of operation eliminates the output counting spikes that. This synchronous, presettable counter features an internal carry. As presetting is synchronous setting up a low. Hold time at any input. Maximum Ratings are those values beyond which damage to the device may occur.

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Count to thirteen, fourteen, fifteen, 47ls161, one, and two.

Synchronous 4 Bit Counters; Binary. This mode of operation eliminates the output counting spikes that are normally associated with asynchronous ripple clock counters. Propagation Delay, Clock load input low to Any Q. Synchronous operation is provided by having all flip-flops clocked simultaneously so that the outputs change conicident with each other when so instructed by the count-enable inputs and internal gating.

The high-level overflow ripple carry pulse can be enable successive cascaded stages. The ripple carry output 74ks161 enabled will produce a high-level output pulse with a datashheet approximately equal to the high level portion of the Q A output.

This synchronous, presettable counter features an internal carry. Output Short Circuit Current.

Fairchild Semiconductor – datasheet pdf

Search field Part name Part description. Low Level Output Current. The ripple carry output thus enabled. All outputs high V. Propagation Delay, Clock load input high to Any Q. Load, clock or enable T. Sequence illustrated in waveforms: Low Level Input Voltage.

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Synchronous 4 Bit Counters; Binary, Direct Reset

High Level Output Voltage. Instrumental in accomplishiing this function are two counter-enable inputs and a ripple carry output. Data inputs P0, P1, P2, P3.

High Level Input Current. A buffered clock input triggers the four flip-flops on the rising positive- going edge of the clock input wave form. The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without additional gating.

This counter is fully programmable; that is the outputs may be preset to either level. As presetting is synchronous datashdet 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 datasneet the enable inputs. Propagation Delay, Enable T to Ripple carry. Synchronous operation is provided by having all flip-flops clocked.

Width of clock pulse. Carry Output for n-Bit Cascading. Enable P or T. The carry look-ahead circuitry provides for cascading counters for.