CD74FCT541

BiCMOS OCTAL BUFFER/DRIVER

WITH 3-STATE OUTPUTS

SCBS741 – JULY 2000

1

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

D BiCMOS Technology With Low Quiescent

Power

D Buffered Inputs

D Noninverted Outputs

D Input/Output Isolation From VCC

D Controlled Output Edge Rates

D 64-mA Output Sink Current

D Output Voltage Swing Limited to 3.7 V

D SCR Latch-Up-Resistant BiCMOS Process

and Circuit Design

D Package Options Include Plastic

Small-Outline (M) and Shrink Small-Outline

(SM) Packages and Standard Plastic (E) DIP

description

The CD74FCT541 is an octal buffer/driver with 3-state outputs that is ideal for driving bus lines or buffer memory

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

and CMOS transistors that limits the output high level to two diode drops below VCC. This resultant lowering

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

minimizes VCC bounce and ground bounce and their effects during simultaneous output switching. The output

configuration also enhances switching speed and is capable of sinking 64 mA.

The 3-state control gate is a two-input AND gate with active-low inputs, so that if either output-enable (OE1 or

OE2) input is high, all corresponding outputs are in the high-impedance state. The outputs provide noninverted

data when they are not in the high-impedance state.

To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup

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

The CD74FCT541 is characterized for operation from 0

°C to 70°C.

FUNCTION TABLE

(each buffer/driver)

INPUTS

OUTPUT

OE1

OE2

A

Y

L

L

L

L

L

LH

H

H

XX

Z

X

H

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

OE1

A1

A2

A3

A4

A5

A6

A7

A8

GND

VCC

OE2

Y1

Y2

Y3

Y4

Y5

Y6

Y7

Y8

E, M, OR SM PACKAGE

(TOP VIEW)