54F573 datasheet(3/10 Pages) TI

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Unit LoadingFan Out

54F74F

Pin Names

Description

Input IIH IIL

HIGHLOW

Output IOH IOL

D0–D7

Data Inputs

1010

20 mA b06 mA

Latch Enable Input (Active HIGH)

1010

20 mA b06 mA

TRI-STATE Output Enable Input

1010

20 mA b06 mA

(Active LOW)

O0–O7

TRI-STATE Latch Outputs

15040(333)

3 mA24 mA (20 mA)

Functional Description

The ’F573 contains eight D-type latches with 3-state output

buffers When the Latch Enable (LE) input is HIGH data on

the Dn inputs enters the latches In this condition the latch-

es are transparent ie a latch output will change state each

time its D input changes When LE is LOW the latches store

the information that was present on the D inputs a setup

time preceding the HIGH-to-LOW transition of LE The 3-

state buffers are controlled by the Output Enable (OE) input

When OE is LOW the buffers are in the bi-state mode

When OE is HIGH the buffers are in the high impedance

mode but this does not interfer with entering new data into

the latches

Function Table

Inputs

Outputs

H e HIGH Voltage Level

L e LOW Voltage Level

X e Immaterial

O0 e Value stored from previous clock cycle

Logic Diagram

TLF9566 – 5

Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays

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