That is, it can be preset to any number between 0 and 15. This mode of operation eliminates the output counting spikes normally associated with asynchronous rippleclock counters. Dm54161dm74161dm74163 synchronous 4bit counters october 1992 dm54161dm74161dm74163 synchronous 4bit counters general description these synchronous, presettable counters feature an internal carry lookahead for application in highspeed counting designs. This is the 4to14 binary up counter that i had to make by modifying the 29 counter. Ti synchronous 4bit counters,alldatasheet, datasheet, datasheet search site for electronic. Dm74ls161a dm74ls163a synchronous 4bit binary counters. Ti, alldatasheet, datasheet, datasheet search site for electronic components and. I have added a debounce circuit, but still to avail. Html pages 1 2 3 4 5 6 7 8 9 10 11 12 14 15 16 17 18 19 20 21 22.
The carry lookahead circuitry provides for cascading counters. Synchronous operation is provided by having all flipflops clocked simultaneously on the positivegoing edge of the clock cp. General description the 74hc161 is a synchronous presettable binary counter with an internal lookhead carry. Because this 4bit synchronous counter counts sequentially on every clock pulse the resulting outputs count upwards from 0 0000 to 15 1111. Function table 74163 presettable synchronous 4 bit counter. They are edgetriggered, synchronously presettable, and cascadable. Synchronous counter operation synchronous counters have a common clock pulse applied simultaneously to all flipflops. They offer the high noise immunity and low power consumption.
Credit application pdf mailfax order pdf california resale certificate pdf multijuris resale certificate pdf rma request. These synchronous, presettable counters feature an inter nal carry lookahead for application in highspeed counting designs. The ls160a161a162a163a are highspeed 4bit synchronous count ers. Ti synchronous 4bit counters,alldatasheet, datasheet, datasheet search site for electronic components and semiconductors, integrated circuits, diodes, triacs, and other semiconductors. The 74ls90 ic counter is an example of a counter circuit that requires cascading in order to obtain a decade counter. To make the maximum count be 14 i put a inverter on q0. The active low synchronous reset sr input of the ls162a and ls163a acts as an edgetriggered control input, overriding cet, cep and pe, and resetting the four counter flipflops on the low to high transition of the clock. The 4 bit down counter shown in below diagram is designed by using jk flip flop. Buy ic 74ls161 4bit synchronous binary counter dip16. So inputs of jk flip flop are connected to the inverted q q. Synchronous counter and the 4bit synchronous counter. So your outputs should be connected like simulate this circuit schematic created using circuitlab you may object that this will provide leds which are on when the output is low, and off when the outputs are high, which is confusing. Sn5474ls160a sn5474ls161a sn5474ls162a sn5474ls163a state diagram ls160a ls162a ls161a ls163a 12, 14, or 15, it will return to its normal sequence note. Synchronous 4bit counters, 74161 datasheet, 74161 circuit, 74161 data sheet.
These synchronous presettable counters feature an inter. This mode of operation eliminates the output counting spikes that are normally associated with asynchronous rippleclock counters. The data sheet used is for an mc14161 counter from motorola. The counter you will use in lab is the 74xx161, the xx determines what technology was implemented when the chip was built. The ls160a and ls162a can be preset to any state, but will not count beyond 9. Jameco will remove tariff surcharges for online orders on instock items learn more. A counter will increment only when the counter below it is at its terminal count and it is being incremented that isthe definition of the rollover signal some people try to tie rollover to the clk input of the next higher counter bad idea very bad idea violates our globally synchronous policy doesnt work as. Datasheet 74161 pdf these synchronous, presettable counters feature an inter nal carry lookahead for application in highspeed counting designs. Synchronous presettable binary counter general description the vhc161 is an advanced highspeed cmos device fabricated with silicon gate cmos technology. According to wikipedia, in digital logic and computing, a counter is a device which stores and sometimes displays the number of times a particular event or process has occurred, often in relationship to a clock signal. If preset to state 10, 1 1, within two clock pulses. Down counter counts the numbers in decreasing order. It was actually very easy to modify the count once i got the concept of the msi counter. Texas instruments and its subsidiaries ti reserve the right to make changes to their products or to discontinue.
A,b, and d are all 0 and c is to 1 which is 22 and this equals 4 which is the number that the counter restarts at. The gate output is connected to the clear input to synchronously clear the counter to all low outputs. Counter, presettable binary, synchronous, 120mhz, max count 15, 1. Counters are used in digital electronics for counting purpose, they can count specific event. Because presetting is synchronous, a low logic level at the load 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 enp and ent. A 2bit synchronous binary counter inputs outputs comments j k clk q q 0 0 q0 q0 no change 0 1 0 1 reset 1 0 1 0 set 1 1 q0 q0 toggle note that both the j and k inputs are connected together.
Therefore, this type of counter is also known as a 4bit synchronous up counter however, we can easily construct a 4bit synchronous down counter by connecting the and gates to the q output of the flipflops as shown to produce a waveform timing. The vhc161 is a highspeed synchronous modulo16 binary. Sn54161, sn 74161 synchronous binary counters are similar. Synchronous 4bit binary counter datasheet texas instruments. They are synchronously presettable for application in programmable dividers and have two types of count enable inputs plus a terminal count output for versatility in forming synchronous multistage. Function table 74163 presettable synchronous 4 bit counter with synchronous from ece 2372 at texas tech university. The decade counter is formed by cascading a mod2 counter with a mod5 counter. They are edgetriggered, synchronously presettable, 74161 synchronous counter dip16,32mhzsigmatechbd,bangladesh.
826 917 1579 1420 619 371 852 1286 1205 1600 192 1364 1355 1098 947 1013 244 330 452 1656 1616 1650 1236 591 1158 1000 770 494 1420 672 415 482