74LS161 DATASHEET PDF

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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This counter is fully programmable; that is the outputs may be preset to either level. Low Level Input Current. Width of reset pulse. Instrumental in accomplishiing this function are two counter-enable inputs and a ripple carry output.

A datashheet clock input triggers the four flip-flops on the rising positive- going edge of the clock input wave form. A buffered clock input triggers the four flip-flops on the rising positive- going edge of the clock input wave form. This mode adtasheet operation eliminates the output counting spikes that.

High Level Output Current. The ripple carry output thus enabled will produce a high-level output pulse eatasheet a duration approximately equal to the high level portion of the Q.

Synchronous 4 Bit Counters; Binary, Direct Reset

The high-level overflow ripple carry pulse datasyeet be enable successive cascaded stages. Data inputs P0, P1, P2, P3. 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 inputs.

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Search field Part name Part description. Data or enable P. All outputs high V.

74LS datasheet, Pinout ,application circuits Synchronous 4 Bit Counters; Binary, Direct Reset

Propagation Delay, Clock load input high to Any Q. Enable P or T. The ripple carry output datashwet enabled. This mode of operation eliminates the output counting spikes that. Load, clock or enable T. Propagation Delay, Enable T to Ripple carry. This synchronous, presettable counter features an internal carry.

Propagation Delay, Clock load input low to Any Q. Sequence illustrated in waveforms: This synchronous, presettable counter features an internal carry. High Level Output Voltage. 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. Maximum Ratings are those datasehet beyond which damage to the device may occur.

Internal Look-Ahead for Fast Counting. Not more than one output should be shorted at a time, and the duration should not exceed one second.

Propagation Delay, Reset to Any Q. Load, clock or enable T Reset. High Level Input Current. Synchronous operation is provided by having all flip-flops clocked. Preset to binary twelve. This mode of operation eliminates the output counting spikes that are normally associated with asynchronous ripple clock counters.

74LS Datasheet pdf – Synchronous 4-Bit Binary Counters – Fairchild Semiconductor

Output Short Circuit Current. Width of clock pulse. Low Level Output Voltage. The carry look-ahead circuitry provides for cascading counters for. 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 A output. Propagation Delay, Clock to Ripple carry. Functional operation should be restricted to the Recommended Operating Conditions.

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Low Level Input Voltage. As presetting is synchronous setting up a low. Hold time at any input. Reset outputs to zero.

All diodes are 1N or 1N Count to thirteen, fourteen, fifteen, zero, one, and two. This counter is fully programmable; that is the datashedt may be. 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 inputs. This counter is fully programmable; that is the outputs may be. The carry look-ahead circuitry provides for cascading counters for n-bit synchronous applications without additional gating.

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.