CD74FCT573, CD74FCT573AT

BiCMOS OCTAL TRANSPARENT D-TYPE LATCHES

WITH 3-STATE OUTPUTS

SCBS744A – JULY 2000 – REVISED JULY 2000

1

POST OFFICE BOX 655303

Power

and Circuit Design

Small-Outline (M) and Shrink Small-Outline

(SM) Packages and Standard Plastic (E) DIP

description

The CD74FCT573 and CD74FCT573AT are octal, transparent, D-type latches, designed using a

small-geometry BiCMOS technology. The output stage is a combination of bipolar and CMOS transistors that

ground bounce and their effects during simultaneous output switching. The output configuration also enhances

switching speed and is capable of sinking 48 mA.

When the latch-enable (LE) input is high, the Q outputs follow the data (D) inputs. When LE is low, the Q outputs

are latched at the logic levels of 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) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines

significantly. The high-impedance state and increased drive provide the capability to drive bus lines without

interface or pullup components.

OE does not affect 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.

resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.

The CD74FCT573 and CD74FCT573AT are characterized for operation from 0

°C to 70°C.

FUNCTION TABLE

(each latch)

INPUTS

OUTPUT

OE

LE

D

Q

L

H

H

H

L

HL

L

L

LX

Q0

H

X

X

Z

Copyright

© 2000, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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

1Q

2Q

3Q

4Q

5Q

6Q

7Q

8Q

LE

CD74FCT573 ...M OR SM PACKAGE

CD74FCT573AT...E PACKAGE

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