74374 IC D type Flip Flop Chip
8-Bit Flip Flop Schematic
The chip function 74374 is used in its generic meaning. The actual 74374 is long sense obsolete, being replaced by a number of other newer TTL family variants.
First replaced with the low power variant 74L374, than the higher speed version, as the 74S374, and finally with the 74ALS374 version. These early versions were than replace by a number of other IC families some of which are listed below.
In all cases the pin function remain the same, with only the internal structure of the IC changing, and in some cases the IC package.
IC 8-Bit Flip Flop Chip. The circuit depicts an 8-bit D-type flip flop with Output Control function [OC]. The OC pin controls the Totem-Pole output of the pins. A logic high on the OC pins turns both transistors of the totem-pole off and renders the outputs in a high impedance state, while a low on the OC line allows the outputs to operate normally. A 74374 IC. Note that the clock input buffer may have a Schmitt trigger input. However the diagram above does not show one for a TTL 74374 IC.
Octal Edge-Triggered D-type Flip-Flops With 3-State Outputs, normally found in a 20 pin DIP, SOIC, SOP, SSOP, TSSOP, VFBGA, or LCCC; IC Package Styles
Flip Flop by Family: [Decoding TTL Family Acronyms]
54AHC374 [Military Temperature range]
54AHCT374 [Military Temperature range]
54LVC374A [Military Temperature range]
74LV374A [Commercial Temperature range]
74LVTH374 [Commercial Temperature range]
Both 54xx and 74xx parts are shown, but those parts may be produced in either series. Decode Commercial temperature ranges or Industrial temperature ranges by IC Prefixes.
Note that these part numbers do not include a prefix which would identify the manufacturer, or a suffix that would identify the type of package used.
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Editor note; Some engineers use the acronym OC to refer to Open Collector, while this data sheet uses OC to mean Output Control. Of course there's a significant difference between the two meanings; in this case defining a totem-pole output and in the other case referring to an Open Collector output port. Of course the real function is exposed by using the phrase Tri-state or high-impedance output used in the data sheet. However the true meaning only comes by detail reading of the data sheet, so there is a chance of misunderstanding, and care should be taken when reviewing the data sheet.