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SDFS011A − MARCH 1987 − REVISED OCTOBER 1993

Copyright  1993, Texas Instruments Incorporated

2−1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443

•Eight Latches in a Single Package

•3-State Bus-Driving True Outputs

•Full Parallel Access for Loading

•Buered Control Inputs

•Package Options Include Plastic

Small-Outline Packages, Ceramic Chip

Carriers, and Standard Plastic and Ceramic

300-mil DIPs

description

These 8-bit latches feature 3-state outputs

designed specifically for driving highly capacitive

or relatively low-impedance loads. They are

particularly suitable for implementing buffer

registers, I/O ports, bidirectional bus drivers, and

working registers.

The eight latches of the ′F573 are transparent

D-type latches. While the latch enable (LE) input

is high, the Q outputs follow the data (D) inputs.

When the latch enable is taken low, the Q outputs

are latched at the logic levels set up at the D

inputs.

A buffered output enable (OE) input can be used

to place the eight outputs in either a normal logic

state (high or low logic levels) or a high-

impedance state. In the high-impedance state, the

outputs neither load nor drive the bus lines

significantly. The high-impedancestate and

increased drive provide the capability to drive bus

lines without need for interface or pullup

components.

The output enable (OE) input does not aect the internal operations of the latches. Old data can be retained

or new data can be entered while the outputs are in the high-impedance state.

The SN54F573 is characterized for operation over the full military temperature range of −55° °C to 125C. The

SN74F573 is characterized for operation from 0°C to 70°C.

FUNCTION TABLE

(each latch)

INPUTS

OUTPUT

OE LED

OUTPUT

Q

LH HH

L H LL

LL XQ0

H XXZ

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

OE

1D

2D

3D

4D

5D

6D

7D

8D

GND

VCC

1Q

2Q

3Q

4Q

5Q

6Q

7Q

8Q

LE

SN54F573. . . J PACKAGE

SN74F573. . . DW OR N PACKAGE

(TOP VIEW)

3 2 12019

910 11 1213

4

5

6

7

8

18

17

16

15

14

2Q

3Q

4Q

5Q

6Q

3D

4D

5D

6D

7D

2D

1D

OE

8Q

7Q 1Q

8D

G

ND

LE

V

CC

SN54F573. . . FK PACKAGE

(TOP VIEW)

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