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54LS163A, 54LS163A/BEA, 54LS163A/BEAJC883

Table of contents:
Info of 54LS163A
Info of 54LS163A/BEA
Info of 54LS163A/BEAJC883

54LS163A, 54LS163A/BEA, 54LS163A/BEAJC883 Selling Leads, Datasheet

MFG:TI Package Cooled:CDIP16 D/C:0712+

54LS163A, 54LS163A/BEA, 54LS163A/BEAJC883 Picture

54LS163A, 54LS163A/BEA, 54LS163A/BEAJC883 Datasheet download

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Part Number: 54LS163A

MFG: TI

Package Cooled: CDIP16

D/C: 0712+

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54LS163A General Description

These synchronous, presettable counters feature an internal carry look-ahead for application in high-speed counting designs. The LS161A and LS163A are 4-bit binary counters. The carry output is decoded by means of a NOR gate, thus preventing spikes during the normal counting mode of operation. Synchronous operation is provided by having all flipflops clocked simultaneously so that the outputs change coincident with each other when so instructed by the countenable inputs and internal gating. This mode of operation eliminates the output counting spikes which are normally associated with asynchronous (ripple clock) counters. A buffered clock input triggers the four flip-flops on the rising (positive-going) edge of the clock input waveform.

These counters are fully programmable; that is, the outputs may be preset to either level. 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. The clear function for the LS161A is asynchronous; 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. The clear function for the LS163A 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. 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. 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 additional gating. Instrumental in accomplishing this function are two count-enable inputs and a ripple carry output.

Both count-enable inputs (P and T) must be high to count, and input T is fed forward to enable the ripple carry output. 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 QA output. This high-level overflow ripple carry pulse can be used to enable successive cascaded stages. High-to-low level transitions at the enable P or T inputs may occur, regardless of the logic level of the clock. These counters feature a fully independent clock circuit. Changes made to control inputs (enable P or T or load) that will modify the operating mode have no effect until clocking occurs. The function of the counter (whether enabled, disabled, loading, or counting) will be dictated solely by the conditions meeting the stable set-up and hold times.

54LS163A Maximum Ratings

Supply Voltage ....................................................................................7V
Input Voltage ......................................................................................7V
Operating Free Air Temperature Range
DM54LS and 54LS ......................................................-55 to +125
DM74LS .............................................................................0 to +70
Storage Temperature Range .........................................-65 to +150

54LS163A Features

* Synchronously programmable
* Internal look-ahead for fast counting
* Carry output for n-bit cascading
* Synchronous counting
* Load control line
* Diode-clamped inputs
* Typical propagation time, clock to Q output 14 ns
* Typical clock frequency 32 MHz
* Typical power dissipation 93 mW
* Alternate Military/Aerospace device (54LS161,
54LS163) is available. Contact a National Semiconductor
Sales Office/Distributor for specificaitons.

54LS163A Connection Diagram

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