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

OE2

Y1

Y2

Y3

Y4

Y5

Y6

Y7

Y8

SN74AHCT540 . . . DB, DGV, DW, N, NS, OR PW PACKAGE

(TOP VIEW)

3

2

1

20 19

9 10 11 12 13

4

5

6

7

8

18

17

16

15

14

Y1

Y2

Y3

Y4

Y5

A3

A4

A5

A6

A7

SN54AHCT540 . . . FK PACKAGE

(TOP VIEW)

SN54AHCT540 . . . J OR W PACKAGE

SN54AHCT540

SN74AHCT540

www.ti.com

SCLS268M – OCTOBER 1995 – REVISED JUNE 2013

OCTAL BUFFERS/DRIVERS WITH 3-STATE OUTPUTS

Check for Samples: SN54AHCT540, SN74AHCT540

1

FEATURES

•

Inputs Are TTL-Voltage Compatible

•

Latch-Up Performance Exceeds 250 mA Per

JESD 17

•

ESD Protection Exceeds JESD 22

–

2000-V Human-Body Model (A114-A)

–

200-V Machine Model (A115-A)

–

1000-V Charged-Device Model (C101)

DESCRIPTION

The ’AHCT540 octal buffers/drivers are ideal for

driving bus lines or buffer memory address registers.

These devices feature inputs and outputs on opposite

sides of the package to facilitate printed circuit board

layout.

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

inverted data when they are not in the high-

impedance state.

To ensure the high-impedance state during power up

pullup resistor; the minimum value of the resistor is

determined by the current-sinking capability of the

driver.

FUNCTION TABLE

(EACH BUFFER/DRIVER)

INPUTS

OUTPUT

Y

OE1

OE2

A

L

L

L

H

L

L

H

L

H

X

X

Z

X

H

X

Z

1

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.

Copyright © 1995–2013, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.