74F403A datasheet(4/15 Pages) FAIRCHILD

Nome de Peças	74F403A

Descrição Electrónicos	First-In First-Out (FIFO) Buffer Memory

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FIGURE 3. Conceptual Output Section

Parallel Data Extraction— When the FIFO is empty after

a LOW pulse is applied to MR, the Output Register Empty

(ORE) output is LOW. After data has been entered into the

FIFO and has fallen through to the bottom stack location, it

is transferred into the Output Register provided the “Trans-

fer Out Parallel” (TOP) input is HIGH. As a result of the

data transfer ORE goes HIGH, indicating valid data on the

data outputs (provided the 3-STATE buffer is enabled).

TOP can now be used to clock out the next word. When

TOP goes LOW, ORE will go LOW indicating that the out-

put data has been extracted, but the data itself remains on

the output bus until the next HIGH level at TOP permits the

transfer of the next word (if available) into the Output Reg-

ister. During parallel data extraction CPSO should be LOW.

TOS should be grounded for single slice operation or con-

nected to the appropriate ORE for expanded operation

(see Expansion section).

TOP is not edge triggered. Therefore, if TOP goes HIGH

before data is available from the stack, but data does

become available before TOP goes LOW again, that data

will be transferred into the Output Register. However, inter-

nal control circuitry prevents the same data from being

transferred twice. If TOP goes HIGH and returns to LOW

before data is available from the stack, ORE remains LOW

indicating that there is no valid data at the outputs.

Serial Data Extraction— When the FIFO is empty after a

LOW pulse is applied to MR, the Output Register empty

(ORE) output is LOW. After data has been entered into the

FIFO and has fallen through to the bottom stack location, it

is transferred into the Output Register provided TOS is

LOW and TOP is HIGH. As a result of the data transfer

ORE goes HIGH indicating valid data in the register. The 3-

STATE Serial Data Output, QS, is automatically enabled

and puts the first data bit on the output bus. Data is serially

shifted out on the HIGH-to-LOW transition of CPSO. To

prevent false shifting, CPSO should be LOW when the new

word is being loaded into the Output Register. The fourth

transition empties the shift register, forces ORE output

LOW and disables the serial output, QS (refer to Figure 3).

For serial operation the ORE output may be tied to the TOS

input, requesting a new word from the stack as soon as the

previous one has been shifted out.

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