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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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Virgin Galactic — Commercial Space Flight. To insure proper operation the rise tr and fall time tf of the clock must be less than 1 00 ns. 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.

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 74LS90 is a simple counter, i. Independent use of the first flip-flop is available if the reset function coin- cides with reset of the 3-bit ripple-through counter.

74LS90 BCD Counter IC Pin Diagram, Configuration, Equivalent & Datasheet

The first flip-flop is used as a binary element for the divide-by-two function. This enables the cascade connection of the inbuilt counters. Output 1, BCD Output bit 0.


Choosing Battery for Robots. State changes of the Q outputs do not occur simultaneously because of internal ripple delays. What is Web Browser. Dafasheet to main content.

The Qq output of each device is designed and specified to drive the rated fan-out plus the CP- input 74s90 the device. Supply voltage; 5V 4. A pulse is also generated probably at pin 9 as it resets its output to The chip can datadheet up to other maximum numbers and return to zero by changing the modes of Output 4, BCD Output bit 3. Choosing Motor For Robots. Search the history of over billion web pages on the Internet.

The other high counts can be generated by connecting two or more ICs.

National Semiconductor

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. Full text of ” IC Datasheet: The Output LOW drive factor is 2. The CPq in- put receives the incoming count and Q3 produces a sym- metrical divide-by-twelve square wave output. 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.

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 Qg Outputs are guaranteed datassheet drive the full fan-out plus the CPi input of the device. Output 2, BCD Output bit 1. This high-density System-in-Package SiP integrates controller, power switches, and support components.

Simultaneous frequency divisions of 2, 4, and 8 are datasgeet at the QiQ2, and Q3 outputs. Therefore, decoded output signals are subject to decoding spikes and should not be used for clocks or strobes. Interface GPS with Arduino. Bi-quinary is a system for storing decimal digits in a four-bit binary number. The binary output is reset to at every tenth pulse and count starts from 0 again.

IC Datasheet: 74LS90 Data Sheet

Output Qq is connected to Input CPi. Thus this system can count from 0 to 99 and give corresponding BCD outputs. Simultaneous divisions of 2, 4, 8, and 1 6 are performed at the Qq, QiQ2.

Each section can be used separately or tied together Q to CP to form BCD, bi-quinary, modulo, or modulo-1 6 counters. The CP- input is used to obtain binary divide-by-five operation at the Q3 output.

The input count pulses are applied to input CPq.