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National Semiconductor Electronic Components Datasheet

74LS240 Datasheet

Octal TRI-STATE Buffers/Line Drivers/Line Receivers

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April 1992
DM54LS240 DM74LS240
DM54LS241 DM74LS241
Octal TRI-STATE Buffers Line Drivers Line Receivers
General Description
These buffers line drivers are designed to improve both the
performance and PC board density of TRI-STATE buffers
drivers employed as memory-address drivers clock drivers
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 133X
Features
Y TRI-STATE outputs drive bus lines directly
Y PNP inputs reduce DC loading on bus lines
Y Hysteresis at data inputs improves noise margins
Y Typical IOL (sink current)
54LS 12 mA
74LS 24 mA
Y Typical IOH (source current)
54LS b12 mA
74LS b15 mA
Y Typical propagation delay times
Inverting
10 5 ns
Noninverting 12 ns
Y Typical enable disable time 18 ns
Y Typical power dissipation (enabled)
Inverting
130 mW
Noninverting 135 mW
Connection Diagrams
Dual-In-Line Package
Dual-In-Line Package
TL F 6411 – 1
Order Number DM54LS240J
DM54LS240W DM54LS240E
DM74LS240WM or DM74LS240N
See NS Package Number E20A J20A
M20B N20A or W20A
Function Tables
TL F 6411 – 2
Order Number DM54LS241J
DM54LS241W DM54LS241E
DM74LS241WM or DM74LS241N
See NS Package Number E20A J20A
M20B N20A or W20A
LS240
Inputs
GA
LL
LH
HX
Output
Y
H
L
Z
LS241
Inputs
Outputs
G G 1A 2A 1Y 2Y
XL
L
X
L
XL
H
X
H
XH
X
X
Z
HX
X
L
L
HX
X
H
H
LX
X
X
Z
L e Low Logic Level
H e High Logic Level
X e Either Low or High Logic Level
Z e High Impedance
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL F 6411
RRD-B30M105 Printed in U S A


National Semiconductor Electronic Components Datasheet

74LS240 Datasheet

Octal TRI-STATE Buffers/Line Drivers/Line Receivers

No Preview Available !

Absolute Maximum Ratings (Note)
If Military Aerospace specified devices are required
please contact the National Semiconductor Sales
Office Distributors for availability and specifications
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
DM54LS 54LS
b55 C to a125 C
DM74LS
0 C to a70 C
Storage Temperature Range
b65 C to a150 C
Note The ‘‘Absolute Maximum Ratings’’ are those values
beyond which the safety of the device cannot be guaran-
teed The device should not be operated at these limits The
parametric values defined in the ‘‘Electrical Characteristics’’
table 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
VCC
VIH
VIL
IOH
IOL
TA
Parameter
Supply Voltage
High Level Input Voltage
Low Level Input Voltage
High Level Output Current
Low Level Output Current
Free Air Operating Temperature
DM54LS240 241
Min Nom Max
45 5 55
2
07
b12
12
b55
125
DM74LS240 241
Min Nom Max
4 75 5 5 25
2
08
b15
24
0 70
Units
V
V
V
mA
mA
C
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
Typ
(Note 1)
Max
Units
VI
HYS
Input Clamp Voltage
Hysteresis (VTa b VTb)
Data Inputs Only
VCC e Min II e b18 mA
VCC e Min
b1 5 V
02 04
V
VOH
VOL
High Level Output Voltage
Low Level Output Voltage
VCC e Min VIH e Min
VIL e Max IOH e b1 mA
VCC e Min VIH e Min
VIL e Max IOH e b3 mA
VCC e Min VIH e Min
VIL e 0 5V IOH e Max
VCC e Min
VIL e Max
VIH e Min
IOL e 12 mA
IOL e Max
DM74
27
DM54 DM74 2 4
DM54 DM74 2
DM74
DM54
DM74
34
V
04
04 V
05
IOZH
IOZL
Off-State Output Current
High Level Voltage Applied
Off-State Output Current
Low Level Voltage Applied
VCC e Max
VIL e Max
VIH e Min
VO e 2 7V
VO e 0 4V
20 mA
b20 mA
II Input Current at Maximum VCC e Max VI e 7V (DM74)
Input Voltage
VI e 10V (DM54)
0 1 mA
IIH High Level Input Current VCC e Max VI e 2 7V
20 mA
IIL Low Level Input Current VCC e Max VI e 0 4V
b0 2 mA
IOS Short Circuit Output Current VCC e Max (Note 2)
b40
b225 mA
ICC Supply Current
VCC e Max
Outputs Open
Outputs High
Outputs Low
LS240 LS241
LS240
13 23
26 44
LS241
27 46 mA
Outputs Disabled LS240
29 50
LS241
32 54
Note 1 All typicals are at VCC e 5V TA e 25 C
Note 2 Not more than one output should be shorted at a time and the duration should not exceed one second
2


Part Number 74LS240
Description Octal TRI-STATE Buffers/Line Drivers/Line Receivers
Maker National Semiconductor
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74LS240 Datasheet PDF






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