CD74FCT821A

BiCMOS 10-BIT BUS-INTERFACE FLIP-FLOP

WITH 3-STATE OUTPUTS

SCBS731 − JULY 2000

1

POST OFFICE BOX 655303

Power

CC

and Circuit Design

Wider Address/Data Paths or Buses With

Parity

Circuitry

Effects

Small-Outline (M) Package and Standard

Plastic (EN) DIP

description

The CD74FCT821A is a 10-bit flip-flop that 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.

This device uses a small-geometry BiCMOS technology. The output stage is a combination of bipolar and

swing (0 V to 3.7 V) reduces power-bus ringing [a source of electromagnetic interference (EMI)] and minimizes

configuration also enhances switching speed and is capable of sinking 48 mA.

The flip-flops enter data into their registers on the low-to-high transition of the clock (CLK). The Q outputs are

noninverted data. The output-enable (OE) input controls the 3-state outputs and is independent of register

operation. When OE is high, the outputs are in the high-impedance state.

The CD74FCT821A is characterized for operation from 0

°C to 70°C.

FUNCTION TABLE

(each flip-flop)

INPUTS

OUTPUT

OE

CLK

D

OUTPUT

Q

L

↑

H

H

L

↑

LL

L

LX

H

X

X

Z

EN OR M 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

10D

GND

1Q

2Q

3Q

4Q

5Q

6Q

7Q

8Q

9Q

10Q

CLK

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.

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.