SN54HC534, SN74HC534

OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOPS

WITH 3-STATE OUTPUTS

SCLS311A – JANUARY 1996 – REVISED MAY 1997

1

POST OFFICE BOX 655303

Drive up to 15 LSTTL Loads

Small-Outline (DW) and Ceramic Flat (W)

Packages, Ceramic Chip Carriers (FK), and

Standard Plastic (N) and Ceramic (J)

300-mil DIPs

description

These 8-bit flip-flops 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

flip-flops

of

the

’HC534

are

edge-triggered D-type flip-flops. On the positive

transition of the clock (CLK) input, the Q outputs

are set to the complement of the logic states that

were set up at the data (D) inputs. The ’HC534 are

functionally equivalent to the ’HC374, but the

’HC534 have inverted outputs.

An output-enable (OE) input places the eight

outputs in either a normal logic state (high or low

logic levels) or the 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 flip-flops. Old data can be retained or new data can be entered

while the outputs are off.

The SN54HC534 is characterized for operation over the full military temperature range of –55

°C to 125°C. The

SN74HC534 is characterized for operation from –40

°C to 85°C.

FUNCTION TABLE

(each flip-flop)

INPUTS

OUTPUT

OE

CLK

D

Q

L

↑

H

L

L

↑

LH

L

H or L

X

Q0

H

X

X

Z

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.

32 1 20 19

910 11 1213

4

5

6

7

8

18

17

16

15

14

8D

7D

7Q

6Q

6D

2D

2Q

3Q

3D

4D

SN54HC534 . . . FK PACKAGE

(TOP VIEW)

SN54HC534 ...J OR W PACKAGE

SN74HC534 . . . DW OR N PACKAGE

(TOP VIEW)

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

OE

1Q

1D

2D

2Q

3Q

3D

4D

4Q

GND

8Q

8D

7D

7Q

6Q

6D

5D

5Q

CLK

Copyright

© 1997, 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.