DM74LS240 • DM74LS241 Octal 3-STATE Buffer/Line Driver/Line Receiver
August 1986
Revised March 2000
DM74LS240 • DM74LS241
Octal 3-STATE Buffer/Line Driver/Line Receiver
General Description
These buffers/line drivers are designed to improve both the
performance and PC board density of 3-STATE buffers/
drivers employed as memory-address drivers, clock driv-
ers, and bus-oriented transmitters/receivers. Featuring
400 mV of hysteresis at each low current PNP data line
input, they provide improved noise rejection and high
fanout outputs and can be used to drive terminated lines
down to 133Ω.
Features
s
3-STATE outputs drive bus lines directly
s
PNP inputs reduce DC loading on bus lines
s
Hysteresis at data inputs improves noise margins
s
Typical I
OL
(sink current)
24 mA
s
Typical I
OH
(source current)
−15
mA
s
Typical propagation delay times
Inverting
Noninverting
10.5 ns
12 ns
s
Typical enable/disable time 18 ns
s
Typical power dissipation (enabled)
Inverting
Noninverting
130 mW
135 mW
Ordering Code:
Order Number
DM74LS240WM
DM74LS240SJ
DM74LS240N
DM74LS241WM
DM74LS241N
Package Number
M20B
M20D
N20A
M20B
N20A
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagrams
DM74LS240
DM74LS241
© 2000 Fairchild Semiconductor Corporation
DS006411
www.fairchildsemi.com
DM74LS240 • DM74LS241
Absolute Maximum Ratings
(Note 1)
Supply Voltage
Input Voltage
Operating Free Air Temperature Range
Storage Temperature Range
7V
7V
0°C to
+70°C
−65°C
to
+150°C
Note 1:
The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Symbol
V
CC
V
IH
V
IL
I
OH
I
OL
T
A
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Free Air Operating Temperature
0
Parameter
Min
4.75
2
0.8
−15
24
70
Nom
5
Max
5.25
Units
V
V
V
mA
mA
°C
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
V
I
HYS
V
OH
Parameter
Input Clamp Voltage
Hysteresis (V
T+
−
V
T−
)
Data Inputs Only
HIGH Level Output Voltage
Conditions
V
CC
=
Min, I
I
= −18
mA
V
CC
=
Min
V
CC
=
Min, V
IH
=
Min
V
IL
=
Max, I
OH
= −1
mA
V
CC
=
Min, V
IH
=
Min
V
IL
=
Max, I
OH
= −3
mA
V
CC
=
Min, V
IH
=
Min
V
IL
=
0.5V, I
OH
=
Max
V
OL
LOW Level Output Voltage
V
CC
=
Min
V
IL
=
Max
V
IH
=
Min
I
OZH
I
OZL
I
I
I
IH
I
IL
I
OS
I
CC
Off-State Output Current,
HIGH Level Voltage Applied
Off-State Output Current,
LOW Level Voltage Applied
Input Current at Maximum
Input Voltage
HIGH Level Input Current
LOW Level Input Current
Short Circuit Output Current
Supply Current
V
CC
=
Max
V
I
=
7V
V
CC
=
Max, V
I
=
2.7V
V
CC
=
Max, V
I
=
0.4V
V
CC
=
Max (Note 3)
V
CC
=
Max,
Outputs OPEN
Outputs HIGH
Outputs LOW
Outputs Disabled
Note 2:
All typicals are at V
CC
=
5V, T
A
=
25°C.
Note 3:
Not more than one output should be shorted at a time, and the duration should not exceed one second.
Min
Typ
(Note 2)
Max
−1.5
Units
V
V
0.2
2.7
2.4
2
I
OL
=
12 mA
I
OL
=
Max
V
O
=
2.7V
V
O
=
0.4V
0.4
3.4
V
0.4
0.5
20
−20
0.1
20
−0.2
−40
13
26
27
29
32
−225
23
44
46
50
54
mA
V
V
CC
=
Max
V
IL
=
Max
V
IH
=
Min
µA
µA
mA
µA
mA
mA
3
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