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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The binary output is reset to at every tenth pulse and count starts from 0 again. SPI Module of Arduino. Search the history of over billion web pages on the Internet.

Independent use of the first flip-flop is available if the reset function coin- cides with reset of the 3-bit ripple-through counter. Bi-quinary is a system for storing decimal digits vatasheet a four-bit binary number. The bi-quinary code was used in the abacus.

Arduino based GPS receiver. What is Web Browser. Interface SD Card with Arduino. Output Qq is connected to Datadheet CPi. The 74LS90 is a simple counter, i. 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. To insure proper operation the rise tr and fall time tf of the clock 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. Choosing Battery for Robots.

This enables the cascade connection of the inbuilt counters. Simultaneous frequency divisions of 2, 4, 7l4s90 8 are available at the QiQ2, and Q3 outputs.

Virgin Galactic — Commercial Space Flight. The Qq output of each device is designed and specified to drive the rated fan-out plus the CP- input of the device. Supply voltage; 5V 4. Not more than one output should be shorted at a time, nor for more than 1 second.

IC Datasheet: 74LS90 Data Sheet

The input datahseet is then applied to the CPi input and a divide-by- ten square wave is obtained at output Qq. 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.

A pulse is also generated probably at pin 9 as it resets its output to 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. Simultaneous divisions of 2, 4, 8, and 1 6 are performed at the Qq, QiQ2. 74ls900 Output LOW drive factor is 2.

These modes are set datasheeet changing the connection of reset pins R 1 – R 4. Output 4, BCD Output bit 3. Full text of ” IC Datasheet: 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.


The input count pulses are applied to input CPq. Output 1, BCD Output bit 0.

74LS90 Datasheet(PDF) – Motorola, Inc

The chip can count up to other maximum numbers and return to zero by changing the modes of The Qg Outputs are guaranteed to drive the full fan-out plus the CPi input of the device. Output 3, BCD Output bit 2. Thus this system can count from 0 to 99 and give corresponding BCD outputs. The CPi in- put is used to obtain catasheet operation at the Q- and Q2 outputs and divide-by-six operation at the Q3 out- put.

State changes of the Q outputs do not occur simultaneously because of internal ripple delays.

Therefore, decoded output signals are subject to decoding spikes and should not be used for clocks or strobes. Output 2, BCD Output bit 1.