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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Therefore, decoded output signals are subject to decoding spikes and should not be used for clocks or strobes.

IC Datasheet: 74LS90 Data Sheet

Interface GPS with Arduino. The Datasheeh 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.

Output 4, BCD Output bit 3.

Not more than one output should be shorted at a time, nor for more than 1 second. Output 1, BCD Output bit 0. Simultaneous frequency divisions of 2, 4, and 8 are available at the QiQ2, and Q3 outputs. The bi-quinary code was used in the abacus.

National Semiconductor

The other high counts can be generated by connecting two or more ICs. It can be used as a divide by 10 counter by connecting Q A with clock input2, grounding all the reset pins, and giving pulse at clock input1. Virgin Galactic — Commercial Space Flight. Each section can be used separately or tied together Q to CP to form BCD, bi-quinary, modulo, or modulo-1 6 counters.

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The first flip-flop is used as datassheet binary element for the divide-by-two function.

Independent use of the first flip-flop is available if the reset function coin- cides with reset of the 3-bit ripple-through counter. Simultaneous divisions of 2, 4, 8, and 1 6 are performed at the Qq, QiQ2. 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.

Output 3, BCD Output bit 2. This high-density System-in-Package SiP integrates controller, power switches, dataxheet support components. Search the history of over billion web pages on the Internet. Choosing Battery for Robots.

Full text of ” IC Datasheet: Bi-quinary is a system for storing decimal digits in a four-bit binary number. 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. What is Web Browser. The binary output is reset to at every tenth pulse dwtasheet count starts from 0 again.

A pulse is also generated probably at pin 9 as it resets its output to The Qg Outputs are guaranteed to drive the full fan-out plus the CPi input of the device. Arduino based GPS receiver. Output 2, BCD Output bit 1. This enables the cascade connection of the inbuilt counters. The 74LS90 is a simple counter, i. The Output LOW drive factor is 2. To insure proper operation the rise tr and fall time tf of the clock must be less than 1 00 ns.


The input count pulses are applied to input CPq.

Full text of “IC Datasheet: 74LS90”

State changes of the Q outputs do not occur simultaneously because of internal ripple delays. Interface SD Card with Arduino. Thus this system can count from 0 to 99 and give corresponding BCD outputs. By connecting Q Datasheer with input1, can be used for BCD counting whereas by connecting Q D with input2, it can be used for bi-quinary counting. These modes are set by changing the connection of reset pins R 1 – R 4. Skip to main content.

Output Qq is connected to Input CPi. Supply voltage; 5V 4. 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 xatasheet maximum numbers and return to zero by changing the modes of