Part Number: 74LS90, Maunfacturer: Motorola, Part Family: 74, File type: PDF, Document: Datasheet – semiconductor. The SN54/74LS90, SN54/74LS92 and SN54/74LS93 are high-speed. 4-bit ripple type counters partitioned into two sections. Each counter has a di- vide-by-two. The 74LS90 is a simple counter, i.e. it can count from 0 to 9 cyclically in its natural mode. It counts the input pulses and the output is received as a 4-bit binary.

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Not more than one output should be shorted at a time, nor for more than 1 second.

National Semiconductor – datasheet pdf

This enables the cascade connection of the inbuilt counters. The first flip-flop is used as a binary element for the divide-by-two function.

Output 1, BCD Output bit 0. Output 3, BCD Output bit 2. The 74LS90 is a simple counter, i. Datazheet is a system for storing decimal digits in a four-bit binary number. The CPq in- put receives the incoming count and Q3 produces a sym- metrical divide-by-twelve square wave output. The chip can count up to other maximum numbers and return to zero by changing the modes of Simultaneous frequency divisions of 2, 4, and 8 are available at the QiQ2, and Q3 outputs.

Therefore, decoded output signals are subject to decoding spikes and should not be used for clocks or strobes. Independent use of the first flip-flop is available if the reset function coin- cides with reset of the 3-bit ripple-through counter.


A pulse is also generated probably at pin 9 as it resets its output to The Output LOW drive factor is 2. These modes are set by changing the connection of reset pins R 1 – R 4.

It can be used as a divide by 10 counter by connecting 774ls90 A with clock input2, grounding all the reset pins, and giving pulse at clock input1. The bi-quinary code was used in the abacus.

SPI Module of Arduino. Thus this system can count from 0 to datssheet and give corresponding BCD outputs. The Qg Outputs are guaranteed to drive the full fan-out plus the CPi input of the device. Output 2, BCD Output bit 1. Full text of ” IC Datasheet: The Qq output of each device is designed and specified to drive the rated fan-out plus the CP- input of the device.

National Semiconductor

State changes of the Q outputs do not occur simultaneously because of internal ripple delays. The first flip-flop is used as a binary element for the divide-by-two function CPq as the input and Qq as the output. Simultaneous divisions of 2, 4, 8, and 1 6 are performed at the Qq, QiQ2. Interface SD Card with Arduino.

By connecting Q A with input1, can be used for BCD counting whereas by connecting Q D with input2, it can be used for bi-quinary counting.

Since the output from the divide-by-two section is not internally connected to the succeeding stages, the devices may be operated in various counting modes. The input count pulses are applied to input CPq. To insure proper operation the rise tr and fall time tf of the clock must be less than 1 00 ns.


Output Qq is connected to Input CPi. The binary output is reset to at every tenth pulse and count starts from 0 again. Choosing Motor For Robots. Arduino based GPS receiver. Search the history of over billion web pages on the Internet. Choosing Battery for Robots. What is Web Browser. Output 4, BCD Output bit 3. Skip to main content.

The input count is then applied to the CPi input and a divide-by- ten square wave is obtained at output Qq. The CP- input is used to obtain binary divide-by-five datashest at the Q3 output.

IC Datasheet: 74LS90 Data Sheet

The other high counts can be generated by connecting two or more ICs. This high-density System-in-Package SiP integrates controller, power switches, and support components. For example, if two are connected in a manner that input of one becomes the output of other, the second IC will receive a pulse on every tenth count and will reset at every hundredth count.

Supply voltage; 5V 4. Each section can be used separately or tied together Q to CP to form BCD, bi-quinary, modulo, or modulo-1 6 counters. The CPi in- put is used to obtain divide-by-three operation at the Q- and Q2 outputs and divide-by-six operation at the Q3 out- put.

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