DW OR NT 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

CLKEN

CLK

SN74BCT29823

9-BIT BUS-INTERFACE FLIP-FLOP

WITH 3-STATE OUTPUTS

SCBS018D – NOVEMBER 1988 – REVISED NOVEMBER 1993

Copyright

2–1

POST OFFICE BOX 655303

MIL-STD-883C, Method 3015; Exceeds

200 V Using Machine Model (C = 200 pF,

R = 0)

Lines Directly

Small-Outline (DW) Packages and Standard

Plastic 300-mil DIPs (NT)

description

This 9-bit bus-interface flip-flop features 3-state

outputs designed specifically for driving highly

capacitive or relatively low-impedance loads. It is

particularly suitable for implementing wider buffer

registers, I/O ports, bidirectional bus drivers with

parity, and working registers.

The nine flip-flops are edge-triggered D-type flip-flops. With the clock-enable (CLKEN) input low, the flip-flops

store data on the low-to-high transitions of the clock. Taking CLKEN high disables the clock buffer, thus latching

the outputs. The SN74BCT29823 has noninverting data (D) inputs. Taking the clear (CLR) input low causes the

nine Q outputs to go low independent of the clock.

A buffered output-enable (OE) input can be used to place the nine 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 need

for interface or pullup components.

The output enable (OE) does not affect the internal operation of the flip-flops. Old data can be retained or new

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

The SN74BCT29823 is characterized for operation from 0

°C to 70°C.

FUNCTION TABLE

(each flip-flop)

INPUTS

OUTPUT

OE

CLR

CLKEN

CLK

D

OUTPUT

Q

L

L

X

X

X

L

L

HL

↑

HH

L

HL

↑

LL

L

HH

X

X

Q0

H

X

X

X

X

Z

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.