ON Semiconductor MC74AC240, MC74ACT240 Technical data

MC74AC240, MC74ACT240

Octal Buffer/Line Driver
with 3−State Outputs

The MC74AC240/74ACT240 is an octal buffer and line driver
designed to be employed as a memory address driver, clock driver and
bus oriented transmitter or receiver which provides improved PC
board density.

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• 3−State Outputs Drive Bus Lines or Buffer Memory Address

Registers

• Outputs Source/Sink 24 mA

• ′ACT240 Has TTL Compatible Inputs

OE

V

CC

2

1920 18 17 16 15 14

21 34567

OE

1

Figure 1. Pinout: 20−Lead Packages Conductors

(Top View)

TRUTH TABLE

Inputs Outputs

OE1D (Pins 12, 14, 16, 18)

L L H
L H L

H X Z

NOTE: H = HIGH Voltage Level

L = LOW Voltage Level
X = Immaterial
Z = High Impedance

TRUTH TABLE

Inputs Outputs

OE2D

L L H
L H L

H X Z

NOTE: H = HIGH Voltage Level

(Pins 3, 5, 7, 9)

L = LOW Voltage Level
X = Immaterial
Z = High Impedance

12

13

8

11

10

9

GND

PDIP−20
N SUFFIX
CASE 738

20

1

20

1

20

1

20

1

SO−20
DW SUFFIX
CASE 751D

TSSOP−20
DT SUFFIX

CASE 948E

EIAJ−20
M SUFFIX
CASE 967

ORDERING INFORMATION

Device Package Shipping

MC74AC240N PDIP−20 18 Units/Rail
MC74ACT240N PDIP−20
MC74AC240DW SOIC−20 38 Units/Rail
MC74AC240DWR2 SOIC−20 1000 Tape & Reel
MC74ACT240DW SOIC−20 38 Units/Rail
MC74ACT240DWR2 SOIC−20
MC74AC240DTR2 TSSOP−20 2500 Tape & Reel
MC74ACT240DTR2 TSSOP−20
MC74AC240MEL EIAJ−20 2000 Tape & Reel
MC74ACT240MEL EIAJ−20

†For information on tape and reel specifications,

including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.

18 Units/Rail

1000 Tape & Reel

2500 Tape & Reel

2000 Tape & Reel

†

DEVICE MARKING INFORMATION

See general marking information in the device marking
section on page 5 of this data sheet.

 Semiconductor Components Industries, LLC, 2004

July, 2004 − Rev. 6

1 Publication Order Number:

MC74AC240/D

MC74AC240, MC74ACT240

r,f

′AC Devices except Schmitt Inputs

In ut Rise and Fall Time (Note 2)

MAXIMUM RATINGS

Symbol Parameter Value Unit

V

CC

V

IN

V

OUT

I

IN

I

OUT

I

CC

T

stg

Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously . If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.

RECOMMENDED OPERATING CONDITIONS

Symbol Parameter Min Typ Max Unit

V

CC

VIN, V

OUT

tr, t

f

tr, t

f

T

J

T

A

I

OH

I

OL

1. VIN from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times.
from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.

2. V

IN

DC Supply Voltage (Referenced to GND) −0.5 to +7.0 V
DC Input Voltage (Referenced to GND) −0.5 to VCC +0.5 V

DC Output Voltage (Referenced to GND) −0.5 to VCC +0.5 V
DC Input Current, per Pin ±20 mA
DC Output Sink/Source Current, per Pin ±50 mA
DC VCC or GND Current per Output Pin ±50 mA
Storage Temperature −65 to +150 °C

Supply Voltage

DC Input Voltage, Output Voltage (Ref. to GND) 0 − V

′AC 2.0 5.0 6.0

′ACT 4.5 5.0 5.5

CC

V

V

VCC @ 3.0 V − 150 −

Input Rise and Fall Time (Note 1)

′

p

p

VCC @ 4.5 V − 40 − ns/V
VCC @ 5.5 V − 25 −

Input Rise and Fall Time (Note 2)
′ACT Devices except Schmitt Inputs

VCC @ 4.5 V − 10 −
VCC @ 5.5 V − 8.0 −

ns/V

Junction Temperature (PDIP) − − 140 °C
Operating Ambient Temperature Range −40 25 85 °C
Output Current − High − − −24 mA
Output Current − Low − − 24 mA

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2

MC74AC240, MC74ACT240

y

(V)

ugee

auoee

ugee

V

auoee

V

au u

A

V

V

GND

au

a u Quesce

A

V

V

GND

DC CHARACTERISTICS

74AC 74AC

V

Symbol Parameter

V

IH

Minimum High Level
Input Voltage

CC

3.0 1.5 2.1 2.1 V

4.5 2.25 3.15 3.15 V or VCC − 0.1 V

5.5 2.75 3.85 3.85

V

IL

Maximum Low Level
Input Voltage

3.0 1.5 0.9 0.9 V

4.5 2.25 1.35 1.35 V or VCC − 0.1 V

5.5 2.75 1.65 1.65

V

OH

Minimum High Level
Output Voltage

3.0 2.99 2.9 2.9 I

4.5 4.49 4.4 4.4 V

5.5 5.49 5.4 5.4

3.0 − 2.56 2.46

4.5 − 3.86 3.76

5.5 − 4.86 4.76 −24 mA

V

OL

Maximum Low Level
Output Voltage

3.0 0.002 0.1 0.1 I

4.5 0.001 0.1 0.1 V

5.5 0.001 0.1 0.1

3.0 − 0.36 0.44

4.5 − 0.36 0.44

5.5 − 0.36 0.44 24 mA

I

IN

I

OZ

Maximum Input
Leakage Current

Maximum
3−State

5.5 − ±0.1 ±1.0 

5.5 − ±0.5 ±5.0 A VI = VCC, GND

Current

I

OLD

I

OHD

I

CC

†Minimum Dynamic

Output Current

Maximum Quiescent
Supply Current

5.5 − − 75 mA V

5.5 − − −75 mA V

5.5 − 8.0 80 

*All outputs loaded; thresholds on input associated with output under test.
†Maximum test duration 2.0 ms, one output loaded at a time.

NOTE: IIN and ICC @ 3.0 V are guaranteed to be less than or equal to the respective limit @ 5.5 V VCC.

TA = +25°C TA =−40°C to +85°C

Typ Guaranteed Limits

Unit Conditions

= 0.1 V

OUT

= 0.1 V

OUT

= −50 A

OUT

*VIN = VIL or V

−12 mA

I

OH

OUT

−24 mA

= 50 A

*VIN = VIL or V

12 mA

I

OL

=

I

V

I

24 mA

,

CC

(OE) = VIL, V

VO = VCC, GND

= 1.65 V Max

OLD

= 3.85 V Min

OHD

=

CC

or

IN

IH

IH

IH

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