74LS161 DATASHEET PDF

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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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Low Level Input Current. Not more than one output should be shorted at a time, and datashert duration should not exceed one second. High Level Input Voltage.

Internal Look-Ahead for Fast Counting. A buffered clock input triggers the four flip-flops on the rising positive- going edge of the clock input wave form.

Carry Output for n-Bit Cascading. The carry look-ahead circuitry provides for cascading counters for. This mode of operation eliminates the output counting spikes that are normally associated with asynchronous ripple clock counters. Low Level Input Voltage. The high-level overflow ripple carry pulse can be enable successive cascaded stages.

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. All outputs high Daatsheet. The ripple carry output thus enabled. Hold time at any input. 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.

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This synchronous, presettable counter features an internal carry.

74LS161 PDF Datasheet浏览和下载

High Level Output Voltage. Enable P or T.

Data inputs P0, P1, P2, P3. Reset outputs to zero. Functional operation should be restricted to the Recommended Operating Conditions. Count to thirteen, fourteen, fifteen, zero, one, and two.

This mode of operation eliminates the output counting spikes that. This counter is fully programmable; that is the outputs may be preset to either level. Propagation Delay, Reset to Any Q.

74LS161 Datasheet PDF

Load, clock or enable T. Width of reset pulse. Load, clock or enable T Reset. High Level Input Current. Synchronous 4 Bit Counters; Binary. This synchronous, presettable counter features an internal carry. All diodes are 1N or 1N Sequence illustrated in waveforms: 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 or enable P. Maximum Ratings are those values beyond which damage to the device may occur. Low Level Output Current. Datasbeet field Part name Part description. 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.

74LS Datasheet(PDF) – Fairchild Semiconductor

Preset to binary twelve. Output Short Circuit Current. Propagation Delay, Clock load input low to Any Q. Propagation Delay, Clock load input high to Any Q. This mode of operation eliminates the output counting spikes that. 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.