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Overview[ edit ] Some TTL logic parts were made with an extended military-specification temperature range. These parts are prefixed with 54 instead of 74 in the part number. A short-lived 64 prefix on Texas Instruments parts indicated an industrial temperature range; this prefix had been dropped from the TI literature by Surface mount parts with a single gate often in a 5-pin or 6-pin package are prefixed with G instead of Some manufacturers released some series equivalent CMOS circuits with a 74 prefix, for example the 74HC was a replacement for the with slightly different electrical characteristics different power supply voltage ratings, higher frequency capabilities, lower "on" resistances in analog switches, etc.
See List of series integrated circuits. Conversely, the series has "borrowed" from the series - such as the CD and CD being pin-for-pin functional replacements for 74C and 74C A few alphabetic characters to designate a specific logic subfamily may immediately follow the 74 or 54 in the part number, e.
Not all functions are available in all families.
In a few instances, such as the andthe same suffix in different families do not have completely equivalent logic functions. 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.
Some xxx parts, however, do not have a direct counterpart from the standard 74xxx range but deliver new functionality instead, which needs making use of the xxx series' higher pin count. For more details, refer primarily to the Texas Instruments documentation mentioned in the References section.
There are a few numeric suffixes that have multiple conflicting assignments, such as the Larger footprints[ edit ] Parts in this section have a pin count of 14 pins or more. The lower part numbers were established in the s and s, then higher part numbers were added incrementally over decades.
IC manufacturers continue to make a core subset of this group, but many of these part numbers are considered obsolete and no longer manufactured. Older discontinued parts may be available from a limited number of sellers as new old stock NOSthough some are much harder to find.
For the following table: Part number column - the "x" is a place holder for the logic subfamily name. For example, 74x00 in "LS" logic family would be "74LS00". Input column - a blank cell means a normal input for the logic family type. Outputs with higher output currents are often called drivers or buffers.
Pins column - number of pins for the dual in-line package version; a number in brackets indicates that there is no known dual in-line package version of this IC 74x00 — 74x"Why DHS?" Global Careers and Professions class offered; School Bus Drivers Needed!
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Exercise 1: Dissolved oxygen is oxygen that is trapped in a fluid, such as water.
Since virtually every living organism requires oxygen to survive, it is a necessary component of water systems such as streams, lakes and rivers in order to support aquatic life.