The SN54/74LS is a synchronous UP/DOWN BCD Decade (). Counter and the SN54/74LS is a synchronous UP/DOWN Modulo Binary Counter. datasheet component integrated circuit schematic application note 90 Datasheet, PDF, Data sheet, manual, pdf, , datenblatt, IC TTL/H/L SERIES, SYN POSITIVE EDGE TRIGGERED 4- BIT.

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up/down decade counter help | Electronics Forum (Circuits, Projects and Microcontrollers)

These counters are fully programmable; that is, the outputs may be preset datsaheet either level by placing a low on the load input and entering the desired data at the data inputs. Please help to improve this article by introducing more precise citations.

June Learn how and when to remove this template message. In a few instances, such as the andthe same suffix in different families do not have completely equivalent logic functions. Data input Datawheet is shown by the dashed line. PLA 12 inputs, 50 terms, 6 outputs. In other projects Wikimedia Commons.

Texas Instruments – datasheet pdf

In addition it may be incorporated into building access systems, TPMS initiators and pet identification system. High power drivers 2. Full text of ” IC Datasheet: Testing and other quality control techniques are used to the extent Tl deems necessary datashset support this warranty.

Conversely, the series has “borrowed” from the series – such as the CD and CD being pin-for-pin functional replacements for 74C and 74C The original series integrated circuits were made by Texas Instruments with the prefix “SN” to create the name SN74xx. Some manufacturers released some series equivalent CMOS circuits with a 74 prefix, for example the 74HC was datashewt replacement for the with slightly different electrical characteristics different power supply voltage ratings, higher frequency capabilities, lower “on” resistances in analog switches, etc.

IC manufacturers continue to make a core subset of this group, but many of these part numbers are considered obsolete and no longer manufactured. The latter output produces a high-level output pulse with a duration approximately equal to one complete cycle of the clock when the counter overflows or underflows.


Synchronous operation is provided by having all flip- flops clocked simultaneously so that the outputs change coincident with each other when so instructed by the steering logic. For simplication, pulse rise times, reference levels, etc. Used in these Industries.

PLA 12 inputs, 32 terms, 6 outputs, 4 state registers. Tl warrants performance of its hardware products to the specifications applicable at the time daasheet sale in accordance with Tl’s standard warranty. Roff Well-Known Member Nov 19, Production processing does not necessarily include testing of all parameters. AND-gated positive edge triggered J-K flip-flopasynchronous preset and clear. SN54′, SN74′ Circuits 5. A high at the enable input inhibits counting. All products are sold subject to Tl’s terms and conditions of sale supplied at the time of order acknowledgment.

To minimize datasjeet risks associated with customer products and applications, iic should provide adequate design and operating safeguards. To participate you need to register. The ripple clock output produces a low-level output pulse equal in width to the low- level portion of the if input when an overflow or underflow condition exists.

This mode of operation eliminates the output counting spikes normally associated with asyn- chronous ripple clock counters.

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The load modulation signal returns by the key is received and demodulated by the MLX Another extension to the series is the xxx variant, representing mostly the bit wide counterpart of otherwise 8-bit-wide “base” chips with the same three ending digits.

Hi i’m trying to build a Count up to fourteen, fifteen maximumzero, one, and two.

Texas Instruments

Surface mount parts with a single gate often in a 5-pin or 6-pin package datashfet prefixed with G instead of These parts are prefixed with 54 instead of 74 in the part number. Forums New posts Search forums.


Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from Tl under the patents or other intellectual property of Tl.

A few alphabetic characters to designate a specific logic subfamily may immediately follow the 74 or 54 in the part number, e. You’ll need to use the load pin pin 11 to load a 5 or what ever number you want to start atinto the counter then have it count down. The input pulses are supplied by generators having datashert following characteristics: Full or half bridge capabilities.

This feature allows the counters to be used as modulo-N dividers by simply modifying the count length with the preset inputs. Welcome to datasheey site! Obsolete product – Not for new designs. Minimum count enable time is the interval immediately preceeding the rising edge of the clock pulse during which interval the count enable input must be low to ensure counting. Buyers acknowledge and agree that, if they use any non-designated products in automotive applications, Tl will not be responsible for any failure to meet such requirements.

The main application for the MLX is automotive passive start, where the IC transmits a high power LF telegram to wake-up the key inside the car.

74190 up/down decade counter help

The key then returns the authorization identification to the car through ultra high frequency UHF to enable datasheeh engine start. Older discontinued parts may be available from a limited number of sellers as new old stock NOSthough some are much harder to find. I qq is measured with all inputs grounded and all outputs open.