Datasheet SN54F240J, SN74F240DBLE, SN74F240DBR, SN74F240DW, SN74F240DWR Datasheet (Texas Instruments)

SN54F240, SN74F240

OCTAL BUFFERS/DRIVERS

WITH 3-STATE OUTPUTS

SDFS061A – D2932, MARCH 1987 – REVISED OCT OBER 1993

Copyright  1993, Texas Instruments Incorporated

2–1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

• 3-State Outputs Drive Bus Lines or Buffer

Memory Address Registers

• Package Options Include Plastic

Small-Outline (SOIC) and Shrink
Small-Outline (SSOP) Packages, Ceramic
Chip Carriers, and Plastic and Ceramic
DIPs

description

These octal buffers and line drivers are designed
specifically to improve both the performance and
density of 3-state memory address drivers, clock
drivers, and bus-oriented receivers and
transmitters. Taken together with the ′F241 and
′F244, these devices provide the choice of
selected combinations of inverting and
noninverting outputs, symmetrical OE

(active-low
output-enable) inputs, and complementary OE
and OE

inputs.

The ′F240 is organized as two 4-bit buffers/line
drivers with separate output enable (OE

) inputs.

When OE

is low, the device passes data from the

A inputs to the Y outputs. When OE

is high, the

outputs are in the high-impedance state.
The SN74F240 is available in TI’s shrink

small-outline package (DB), which provides the
same I/O pin count and functionality of standard
small-outline packages in less than half the
printed-circuit-board area.

The SN54F240 is characterized for operation over
the full military temperature range of –55°C to
125°C. The SN74F240 is characterized for
operation from 0°C to 70°C.

FUNCTION TABLE

(each buffer)

INPUTS

OUTPUT

OE A

Y

L H L
L LH
HXZ

1
2
3
4
5
6
7
8
9
10

20
19
18
17
16
15
14
13
12
11

1OE

1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1

GND

V

CC

2OE
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1

SN54F240 ...J PACKAGE

SN74F240 . . . DB, DW, OR N PACKAGE

(TOP VIEW)

3212019

910111213

4
5
6
7
8

18
17
16
15
14

1Y1
2A4
1Y2
2A3
1Y3

1A2
2Y3
1A3
2Y2
1A4

SN54F240 . . . FK PACKAGE

(TOP VIEW)

2Y4

1A1

1OE

1Y4

2A2 2OE

2Y1

GND

2A1

V

CC

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.

SN54F240, SN74F240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS

SDFS061A – D2932, MARCH 1987 – REVISED OCT OBER 1993

2–2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

logic symbol

†

logic diagram (positive logic)

†

This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.

1

2

4

6

8

19

11

13

15

17

3

5

7

9

12

14

16

18

1A1

1A2

1A3

1A4

1Y1

2A1

2A2

2A3

2A4

2Y1

1Y2

1Y3

1Y4

2Y2

2Y3

2Y4

1OE

2OE

2

1A1

4

1A2

6

1A3

8

1A4

EN

1

1Y1

18

1Y2

16

1Y3

14

1Y4

12

11

2A1

13

2A2

15

2A3

17

2A4

EN

19

2Y1

9

2Y2

7

2Y3

5

2Y4

3

1OE

2OE

absolute maximum ratings over operating free-air temperature range (unless otherwise noted)

‡

Supply voltage range, V

CC

–0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range, V

I

(see Note 1) –1.2 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input current range –30 mA to 5 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Voltage range applied to any output in the disabled or power-off state –0.5 V to 5.5 V. . . . . . . . . . . . . . . . . . .

Voltage range applied to any output in the high state –0.5 V to V

CC

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Current into any output in the low state: SN54F240 96 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74F240 128 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range: SN54F240 –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

SN74F240 0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range –65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

‡

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: The input voltage ratings may be exceeded provided the input current ratings are observed.

SN54F240, SN74F240

OCTAL BUFFERS/DRIVERS

WITH 3-STATE OUTPUTS

SDFS061A – D2932, MARCH 1987 – REVISED OCTOBER 1993

2–3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

recommended operating conditions

SN54F240 SN74F240

MIN NOM MAX MIN NOM MAX

UNIT

V

CC

Supply voltage 4.5 5 5.5 4.5 5 5.5 V

V

IH

High-level input voltage 2 2 V

V

IL

Low-level input voltage 0.8 0.8 V

I

IK

Input clamp current –18 –18 mA

I

OH

High-level output current –12 –15 mA

I

OL

Low-level output current 48 64 mA

T

A

Operating free-air temperature –55 125 0 70 °C

electrical characteristics over recommended operating free-air temperature range (unless
otherwise noted)

SN54F240 SN74F240

PARAMETER

TEST CONDITIONS

MIN TYP†MAX MIN TYP†MAX

UNIT

V

IK

VCC = 4.5 V, II = –18 mA –1.2 –1.2 V

IOH = – 3 mA 2.4 3.3 2.4 3.3

VCC = 4.5 V

IOH = – 12 mA 2 3.2

V

OH

IOH = – 15 mA 2 3.1

V

VCC = 4.75 V , IOH = – 3 mA 2.7

IOL = 48 mA 0.38 0.55

V

OL

V

CC

= 4.5

V

IOL = 64 mA 0.42 0.55

V

I

OZH

VCC = 5.5 V, VO = 2.7 V 50 50 µA

I

OZL

VCC = 5.5 V, VO = 0.5 V –50 –50 µA

I

I

VCC = 5.5 V, VI = 7 V 0.1 0.1 mA

I

IH

VCC = 5.5 V, VI = 2.7 V 20 20 µA

I

IL

VCC = 5.5 V, VI = 0.5 V –1 –1 mA

I

OS

‡

VCC = 5.5 V, VO = 0 –100 –225 –100 –225 mA

Outputs high 19 29 19 29

I

CC

VCC = 5.5 V

Outputs low 50 75 50 75

mA

Outputs disabled 42 63 42 63

†

All typical values are at VCC = 5 V, TA = 25°C.

‡

Not more than one output should be shorted at a time, and the duration of the short circuit should not exceed one second.

SN54F240, SN74F240
OCTAL BUFFERS/DRIVERS
WITH 3-STATE OUTPUTS

SDFS061A – D2932, MARCH 1987 – REVISED OCT OBER 1993

2–4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

switching characteristics (see Note 2)

PARAMETER

FROM

(

INPUT

)

TO

(

OUTPUT

)

VCC = 5 V,
CL = 50 pF,
RL = 500 Ω,
TA = 25°C

VCC = 4.5 V to 5.5 V,
CL = 50 pF,
RL = 500Ω,
TA = MIN to MAX

†

UNIT

(INPUT)

(OUTPUT)

′F240 SN54F240 SN74F240

MIN TYP MAX MIN MAX MIN MAX

t

PLH

2.2 4.7 7 2.2 9 2.2 8

t

PHL

Any A

Y

1.2 3.1 4.7 1.2 6 1.2 5.7

ns

t

PZH

1.2 3.1 5.3 1.2 6.7 1.2 6.1

t

PZL

OE

Y

3.2 6.5 9 3.2 10.5 3.2 10

ns

t

PHZ

1.2 3.6 5.3 1.2 6.5 1.2 6.3

t

PLZ

OE

Y

1.2 5.6 8 1.2 12.5 1.2 9.5

ns

†

For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions.

NOTE 2: Load circuits and waveforms are shown in Section 1.

IMPORTANT NOTICE

T exas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.

CERT AIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICA TIONS IS UNDERST OOD TO
BE FULLY AT THE CUSTOMER’S RISK.

In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.

Copyright  1998, Texas Instruments Incorporated