74F544SC datasheet(2/10 Pages) NSC

2 / 10 page

Connection Diagrams

Pin Assignment for

DIP SOIC and Flatpak

TLF9555 – 3

Pin Assignment

for LCC

TLF9555 – 4

Unit LoadingFan Out

54F74F

Pin Names

Description

Input IIH IIL

HIGHLOW

Output IOH IOL

OEAB

A-to-B Output Enable Input (Active LOW)

1010

20 mA b06 mA

OEBA

B-to-A Output Enable Input (Active LOW)

1010

20 mA b06 mA

CEAB

A-to-B Enable Input (Active LOW)

1020

20 mA b12 mA

CEBA

B-to-A Enable Input (Active LOW)

1020

20 mA b12 mA

LEAB

A-to-B Latch Enable Input (Active LOW)

1010

20 mA b06 mA

LEBA

B-to-A Latch Enable Input (Active LOW)

1010

20 mA b06 mA

A0–A7

A-to-B Data Inputs or

351083

70 mA b650 mA

B-to-A TRI-STATE Outputs

15040(333)

3 mA24 mA (20 mA)

B0–B7

B-to-A Data Inputs or

351083

70 mA b650 mA

A-to-B TRI-STATE Outputs

6001066(80) b12 mA64 mA (48 mA)

Functional Description

The ’F544 contains two sets of eight D-type latches with

separate input and output controls for each set For data

flow from A to B for example the A-to-B Enable (CEAB)

input must be LOW in order to enter data from A0–A7 or

take data from B0–B7 as indicated in the Data IO Control

Table With CEAB LOW a LOW signal on the A-to-B Latch

Enable (LEAB) input makes the A-to-B latches transparent

a subsequent LOW-to-HIGH transition of the LEAB signal

puts the A latches in the storage mode and their outputs no

longer change with the A inputs With CEAB and OEAB both

LOW the TRI-STATE

B output buffers are active and re-

flect the data present at the output of the A latches Control

of data flow from B to A is similar but using the CEBA

LEBA and OEBA inputs

Data IO Control Table

Inputs

Latch Status

Output Buffers

CEAB

LEAB

OEAB

Latched

High Z

Latched

Transparent

High Z

Driving

H e HIGH Voltage Level

L e LOW Voltage Level

X e Immaterial

A-to-B data flow shown B-to-A flow control is the same

except using CEBA LEBA and OEBA

74F544SC Datasheet(PDF) 2 Page - National Semiconductor (TI)

74F544SC Datasheet(HTML) 2 Page - National Semiconductor (TI)

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