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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74190 up/down decade counter help

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Count up to eight, nine maximumzero, one, and two. Load preset to BCD seven. 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.

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Datasheets, Manuals or Parts. Tl does not warrant or represent that any license, either express or implied, is granted datasgeet any Tl patent right, copyright, mask work right, or other Tl intellectual property right relating to any combination, machine, or process in which Tl products or services are used.


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. Forums New posts Search forums. The “x” in the part number is a 7490 holder for the logic family name. Tl assumes no liability for applications assistance or customer product design. Count down to one, zero minimumfifteen, fourteen, and thirteen.

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

Surface mount parts with a single gate often in a 5-pin or 6-pin package are prefixed if G instead of For a better experience, please enable JavaScript in your browser before proceeding.

To test Qq output of ‘ and ‘LS To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. The ripple clock output produces a low-level output pulse equal in width to the low- level portion of the clock 7490 when an overflow or underflow condition exists. Count up to fourteen, fifteen maximumzero, one, and two.

All data inputs are low. This article includes a list of referencesbut its sources remain unclear because it has insufficient inline citations.

Full text of “IC Datasheet: 74LS”

For simplication, pulse rise times, reference levels, etc. Articles Top Articles Search resources. The lower part numbers were established in the s and s, then higher part numbers were added incrementally over decades. PLA 12 inputs, 32 terms, 6 outputs, 4 state registers. The following is a list of series digital logic integrated circuits. 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.


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.

Data input D is shown by the dashed line. Due to the popularity of these parts, other manufacturers have released pin-to-pin compatible devices which kept the sequence number as an aid to identification of compatible parts. Advanced and high performance security system-on-a-chip solution that prevents the car engine from running unless the correct key is present. Roff Well-Known Member Nov 18, Tl is not responsible or liable for such altered documentation.

Used in these Industries. Data in is shown by the solid line dwtasheet both devices. IC manufacturers continue to make a core subset 741900 this group, but many of these part numbers are considered obsolete and no longer manufactured.

In other projects Wikimedia Commons. See List of series integrated circuits.