74F2240 Octal Buffer/Line Driver
January 1995
Revised May 1999
74F2240
Octal Buffer/Line Driver
with 25Ω Series Resistors in the Outputs
General Description
The 74F2240 is an inverting octal buffer and line driver
designed to drive capacitive inputs of MOS memory
devices, address and clock lines or act as a low under-
shoot general purpose bus driver.
The 25Ω series resistor in the outputs reduces undershoot
and ringing and eliminates the need for external resistors.
Features
s
3-STATE outputs drive bus lines or buffer memory
address registers
s
Outputs sink 12 mA and source 15 mA
s
25Ω series resistors in outputs eliminate the need for
external resistors
s
Designed to drive the capacitive inputs of MOS devices
s
Guaranteed 4000V minimum ESD protection
Ordering Code:
Order Number
74F2240SC
74F2240QC
Package Number
M20B
V20A
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
20-Lead Plastic Lead Chip Carrier (PLCC), JEDEC MO-047, 0.350 Square
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Truth Table
OE
1
H
L
L
D
1n
X
H
L
O
1n
Z
L
H
OE
2
H
L
L
D
2n
X
H
L
O
2n
Z
L
H
Unit Loading/Fan Out
Pin
Description
Names
OE
1
, OE
2
3-STATE Output
Enable Input
(Active LOW)
I
0
- I
7
O
0
- O
7
Inputs
Outputs
1.0/1.667
750/20
20
µA/−1
mA
−15
mA/12 mA
1.0/1.667
20
µA/−1
mA
HIGH/LOW
U.L.
Output
I
OH
/I
OL
© 1999 Fairchild Semiconductor Corporation
DS010898.prf
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74F2240
Absolute Maximum Ratings
(Note 1)
Storage Temperature
Ambient Temperature under Bias
Junction Temperature under Bias
V
CC
Pin Potential to Ground Pin
Input Voltage (Note 2)
Input Current (Note 2)
Voltage Applied to Output
In HIGH State (with V
CC
=
0V)
Standard Output
3-STATE Output
Current Applied to Output
in LOW State (Max)
ESD Last Passing Voltage (Min)
twice the rated I
OL
(mA)
4000V
−0.5V
to V
CC
−0.5V
to
+5.5V
−65°C
to
+
150°C
−55°
to
+125°C
−55°C
to
+150°C
−0.5V
to
+7.0V
−0.5V
to
+7.0V
−30
mA to
+5.0
mA
Recommended Operating
Conditions
Free Air Ambient Temperature
Supply Voltage
0°C to 70°C
+4.5V
to
+5.5V
Note 1:
Absolute maximum ratings are values beyond which the device
may be damaged or have its useful life impaired. Functional operation
under these conditions is not implied.
Note 2:
Either voltage limit or current limit is sufficient to protect inputs.
DC Electrical Characteristics
Symbol
V
IH
V
IL
V
CD
V
OH
V
OL
I
IH
I
BVI
I
CEX
V
ID
I
OD
I
IL
I
OZH
I
OZL
I
OS
I
ZZ
I
CCH
I
CCL
I
CCZ
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH
Voltage
Output LOW Voltage
Input HIGH Current
Input HIGH Current Breakdown Test
Output HIGH Leakage Current
Input Leakage
Test
Output Leakage
Circuit Current
Input LOW
Current
Output Leakage Current
Output Leakage Current
Output Short-Circuit Current
Bus Drainage Test
Power Supply Current
Power Supply Current
Power Supply Current
16
47
45
−100
4.75
3.75
−1.0
50
−50
−225
500
29
75
63
10% V
CC
10% V
CC
10% V
CC
2.4
2.0
0.75
5.0
7.0
50
Min
2.0
0.8
−1.2
Typ
Max
Units
V
V
V
V
V
µA
µA
µA
V
µA
mA
µA
µA
mA
µA
mA
mA
mA
Min
Min
Min
Max
Max
Max
0.0
0.0
Max
Max
Max
Max
0.0
Max
Max
Max
V
CC
Conditions
Recognized as a HIGH Signal
Recognized as a LOW Signal
I
IN
= −18
mA
I
OH
= −3
mA
I
OH
= −15
mA
I
OL
=
12 mA
V
IN
=
2.7V
V
IN
=
7.0V
V
OUT
=
V
CC
I
ID
=
1.9
µA
All Other Pins Grounded
V
IOD
=
150 mV
All Other Pins Grounded
V
IN
=
0.5V
(OE
1
, OE
2
, D
n
)
V
OUT
=
2.7V
V
OUT
=
0.5V
V
OUT
=
0V
V
OUT
=
5.25V
V
O
=
HIGH
V
O
=
LOW
V
O
=
HIGH Z
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2
74F2240
AC Electrical Characteristics
T
A
= +25°C
Symbol
Parameter
Min
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Output Disable Time
Propagation Delay
Data to Output
Output Enable Time
3.0
2.0
2.0
4.0
2.0
2.0
V
CC
= +5.0V
C
L
=
50 pF
Typ
4.9
3.7
3.9
6.7
4.1
4.9
Max
7.5
6.0
6.5
9.5
6.5
8.5
T
A
=
0
°
C to
+
70
°
C
V
CC
= +5.0V
C
L
=
50 pF
Min
3.0
2.0
2.0
4.0
2.0
2.0
Max
7.5
6.0
7.0
10.0
7.0
9.5
ns
ns
ns
Units
3
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74F2240
Physical Dimensions
inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Package Number M20B
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4
74F2240 Octal Buffer/Line Driver
Physical Dimensions
inches (millimeters) unless otherwise noted (Continued)
20-Lead Plastic Lead Chip Carrier (PLCC), JEDEC MO-047, 0.350 Square
Package Number V20A
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DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
2. A critical component in any component of a life support
1. Life support devices or systems are devices or systems
device or system whose failure to perform can be rea-
which, (a) are intended for surgical implant into the
sonably expected to cause the failure of the life support
body, or (b) support or sustain life, and (c) whose failure
device or system, or to affect its safety or effectiveness.
to perform when properly used in accordance with
instructions for use provided in the labeling, can be rea-
sonably expected to result in a significant injury to the
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user.
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