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54LS90 - DECADE COUNTER

General Description

The ’90 is a 4-stage ripple counter containing a high speed flip-flop acting as a divide-by-two and three flip-flops connected as a divideby-five counter.

It can be connected to operate with a conventional BCD out­ put pattern or it can be connected to provide a 50% duty cycle output.

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Datasheet Details

Part number 54LS90
Manufacturer Unknown Manufacturer
File Size 302.31 KB
Description DECADE COUNTER
Datasheet download datasheet 54LS90 Datasheet

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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54/7490A 54LS/74LS90 DECADE COUNTER 90 CONNECTION DIAGRAM PINOUT A DESCRIPTION — The ’90 is a 4-stage ripple counter containing a high speed flip-flop acting as a divide-by-two and three flip-flops connected as a divideby-five counter. It can be connected to operate with a conventional BCD out­ put pattern or it can be connected to provide a 50% duty cycle output. In the BCD mode, HIGH signals on the Master Set (MS) inputs set the outputs to BCD nine. HIGH signals on the Master Reset (MR) inputs force all outputs LOW. For a similar counter with corner power pins, see the ’LS290; for dual versions, see the ’LS390 and ’LS490. ORDERING CODE: See Section 9 PKGS PIN OUT COMMERCIAL GRADE Vcc = +5.0 V ±5%, T a = 0°C to +70°C MILITARY GRADE Vcc = +5.