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54F413P-MQB Datasheet(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # 54F413P-MQB
Description  64 x 4 First-In First-Out Buffer Memory with Parallel I/O
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

54F413P-MQB Datasheet(HTML) 2 Page - National Semiconductor (TI)

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Unit LoadingFan Out
54F74F
Pin Names
Description
UL
Input IIH IIL
HIGHLOW
Output IOH IOL
D0–D3
Data Inputs
100667
20 mA b04 mA
O0–O3
Data Outputs
50133
b
1 mA8 mA
IR
Input Ready
100667
20 mA b04 mA
SI
Shift In
100667
20 mA b04 mA
SO
Shift Out
100667
20 mA b04 mA
OR
Output Ready
100667
20 mA b04 mA
MR
Master Reset
100667
20 mA b04 mA
Functional Description
Data Input
Data is entered into the FIFO on D0–D3 in-
puts To enter data the Input Ready (IR) should be HIGH
indicating that the first location is ready to accept data Data
then present at the four data inputs is entered into the first
location when the Shift In (SI) is brought HIGH An SI HIGH
signal causes the IR to go LOW Data remains at the first
location until SI is brought LOW When SI is brought LOW
and the FIFO is not full IR will go HIGH indicating that more
room is available Simultaneously data will propagate to the
second location and continue shifting until it reaches the
output stage or a full location If the memory is full IR will
remain LOW
Data Transfer
Once data is entered into the second cell
the transfer of any full cell to the adjacent (downstream)
empty cell is automatic activated by an on-chip control
Thus data will stack up at the end of the device while empty
locations will ‘‘bubble’’ to the front The tPT parameter de-
fines the time required for the first data to travel from input
to the output of a previously empty device
Data Output
Data is read from the O0–O3 outputs When
data is shifted to the output stage Output Ready (OR) goes
HIGH indicating the presence of valid data When the OR is
HIGH data may be shifted out by bringing the Shift Out (SO)
HIGH A HIGH signal at SO causes the OR to go LOW Valid
data is maintained while the SO is HIGH When SO is
brought LOW the upstream data provided that stage has
valid data is shifted to the output stage When new valid
data is shifted to the output stage OR goes HIGH If the
FIFO is emptied OR stays LOW and O0–O3 remains as
before ie data does not change if FIFO is empty
Input Ready and Output Ready
may also be used as
status signals indicating that the FIFO is completely full (In-
put Ready stays LOW for at least tPT) or completely empty
(Output Ready stays LOW for at least tPT)
Block Diagram
TLF9541 – 4
2


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