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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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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. High Level Output Current.

High Level Input Voltage. Maximum Ratings are those values beyond which damage to the device may occur. Low Level Output Current.

Fairchild Semiconductor

This counter is fully programmable; that is the outputs may be. Carry Output for n-Bit Cascading.

A buffered clock input triggers the four flip-flops on the rising positive- going edge of the clock input wave form. Synchronous operation is provided by having all flip-flops clocked. Width of reset pulse.

Instrumental in accomplishiing this function are two counter-enable inputs and a ripple carry output. Reset outputs to zero. Low Level Output Voltage. The high-level overflow ripple carry pulse can be enable successive cascaded stages. Output Short Circuit Current. ddatasheet

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All outputs high V. 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. Propagation Delay, Clock load input high to Any Q. Width of clock pulse. The carry look-ahead circuitry provides for cascading counters for. This datashert of operation eliminates the output counting spikes that.

Sequence illustrated in waveforms: Propagation Datashedt, Clock load input low to Any Q. Load, clock or enable T Reset. Preset to binary twelve.

High Level Input Current. A buffered clock input triggers the four flip-flops on the rising positive- going edge of the clock input wave datasheett. Propagation Delay, Reset to Any Q. Enable P or T.

This counter is fully programmable; that is the outputs may be. This synchronous, presettable counter features an internal carry. Propagation Delay, Clock to Ripple carry.

74LS161 PDF Datasheet浏览和下载

Synchronous 4 Bit Counters; Binary. Hold time at any input. All diodes 74lw161 1N or 1N The ripple carry output thus enabled will produce a high-level output pulse dagasheet a duration approximately equal to the high level portion of the Q A output. 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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Data inputs P0, P1, P2, P3. Search field Part name Part description. The 744ls161 look-ahead circuitry provides for cascading counters for. Internal Look-Ahead for Fast Counting. Propagation Delay, Enable T to Ripple carry. Count to thirteen, fourteen, fifteen, zero, one, and two.

The ripple carry output thus enabled will produce a high-level output datawheet with a duration approximately equal to the high level portion of the Q. Not more than one output should be shorted at a time, and the duration should not exceed one second.

This synchronous, presettable counter features an internal carry. 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.

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

Functional operation should be restricted to the Recommended Operating Conditions. Data or enable P. High Level Output Voltage. This mode of operation eliminates the output counting spikes that are normally associated with asynchronous ripple clock counters.