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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Simultaneous divisions of 2, 4, 8, and 1 6 are performed at the Qq, QiQ2. Skip to main content.

It can be used as a divide by 10 counter by connecting Q A with clock input2, grounding all the reset pins, 74ls09 giving pulse at clock input1. State changes of the Q outputs do not occur simultaneously because of internal ripple delays.

Bi-quinary is a system for storing decimal digits in a four-bit binary number.

74LS90 | IC 74LS90 Datasheet | IC Pin Diagram & Description

The 74LS90 is a simple counter, i. Output Qq is connected to Input CPi. This enables the cascade connection of the inbuilt counters.

Output 2, BCD Output bit 1. Interface SD Card with Arduino.


A pulse is also generated probably at pin 9 as it resets its output to Search the history of over billion web datawheet on the Internet. The input count is then applied to the CPi input and a divide-by- ten square wave is obtained at output Qq.

These modes are set by changing the connection of reset pins R 1 – R 4. 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. Choosing Motor For Robots. The Qg Outputs are guaranteed to drive the full fan-out plus the CPi input of the device.

SPI Module of Arduino. Thus this system can count from 0 to 99 and give corresponding BCD outputs. The Output LOW drive factor is 2. The CP- input is used to obtain binary divide-by-five operation at the Q3 output. Output 4, BCD Output bit 3. The CPq in- put receives dahasheet incoming count and Q3 produces a sym- metrical divide-by-twelve square wave output.

The first flip-flop datashheet used as a binary element for the divide-by-two function. Arduino based GPS receiver. Interface GPS with Arduino. 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.


Supply datzsheet 5V 4. To insure proper operation the rise tr and fall time tf of the ddatasheet must be less than 1 00 ns.

Each section can be used separately or tied together Q to CP to form BCD, bi-quinary, modulo, or modulo-1 6 counters. This high-density System-in-Package SiP integrates controller, power switches, and support components. 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. The input count pulses are applied to input CPq.

National Semiconductor

Not more than one output should be shorted at a time, nor for more than 1 second. The bi-quinary code was used in the abacus. 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.

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