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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IC Datasheet: 74LS90 Data Sheet

The 74LS90 is a simple counter, i. Output 1, BCD Output bit 0. SPI Module of Arduino.

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. Skip to main content. The first flip-flop is used as a binary element for the divide-by-two function.

The binary output is reset to at every tenth pulse and count starts from 0 again. Arduino based GPS receiver.

National Semiconductor

Therefore, decoded output signals are subject to decoding spikes and should not be used for clocks or strobes. The Qq output of each device is designed and specified to drive the rated fan-out plus the CP- input of the device. Output 3, BCD Output bit 2.


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 CPq in- put receives the incoming count and Q3 produces a sym- metrical divide-by-twelve square wave output.

Full text of “IC Datasheet: 74LS90”

Search the history of over billion web pages on the Internet. Bi-quinary is a system for storing decimal digits in a four-bit binary number. This enables the cascade connection of the inbuilt counters. The Output LOW drive factor is 2. 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. Full text of ” IC Datasheet: The chip can count up to other maximum numbers and return to zero by changing the modes of Choosing Motor For Robots.

The CP- input is used to obtain binary divide-by-five operation at the Q3 output.

What is Web Browser. Output 2, BCD Output bit 1.


This high-density System-in-Package SiP integrates controller, power switches, and support components. Simultaneous divisions of 2, 4, 8, and 1 6 are performed at the Qq, QiQ2. Output Qq is connected to Input CPi. The Qg Outputs are guaranteed to drive the full fan-out plus the CPi input of the device. 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.

State changes of the Q outputs do not occur simultaneously because of internal ripple delays. The bi-quinary code was used in the abacus.

74LS90 Datasheet, PDF – Alldatasheet

Supply voltage; 5V 4. To insure proper operation the rise tr and fall time tf of the clock must be less than 1 00 ns. Simultaneous frequency divisions of 2, 4, and 8 are available at the QiQ2, and Q3 outputs. These modes are set by changing the connection of reset pins R 1 – R 4.