SN74LVC843A

9-BIT BUS-INTERFACE D-TYPE LATCH

WITH 3-STATE OUTPUTS

SCAS308E – MARCH 1993 – REVISED JUNE 1998

1

POST OFFICE BOX 655303

CMOS) Submicron Process

Live Insertion

All Ports (5-V Input/Output Voltage With

Small-Outline (DW), Shrink Small-Outline

(DB), and Thin Shrink Small-Outline (PW)

Packages

description

The SN74LVC843A is designed specifically for driving highly capacitive or relatively low-impedance loads. It

is particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and

working registers.

The nine latches are transparent D-type latches. The device has noninverting data (D) inputs and provides true

data at its outputs.

A buffered output-enable (OE) input can be used to place the nine outputs in either a normal logic state (high

or low logic levels) or a high-impedance state. The outputs are also in the high-impedance state during power-up

and power-down conditions. The outputs remain in the high-impedance state while the device is powered down.

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 latch. Previously stored data can be retained or new data can

be entered while the outputs are in the high-impedance state.

Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators

in a mixed 3.3-V/5-V system environment.

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

The SN74LVC843A is characterized for operation from –40

°C to 85°C.

Copyright

© 1998, Texas Instruments Incorporated

PRODUCT PREVIEW information concerns products in the formative or

design phase of development. Characteristic data and other

specifications are design goals. Texas Instruments reserves the right to

change or discontinue these products without notice.

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.

EPIC is a trademark of Texas Instruments Incorporated.

DB, DW, OR PW PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

8

9

10

11

12

24

23

22

21

20

19

18

17

16

15

14

13

OE

1D

2D

3D

4D

5D

6D

7D

8D

9D

CLR

GND

1Q

2Q

3Q

4Q

5Q

6Q

7Q

8Q

9Q

PRE

LE