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Fairchild Semiconductor Electronic Components Datasheet

74LS240 Datasheet

Octal 3-STATE Buffer/Line Driver/Line Receiver

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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 133.
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 IOL (sink current)
24 mA
s Typical IOH (source current)
15 mA
s Typical propagation delay times
Inverting
10.5 ns
Noninverting 12 ns
s Typical enable/disable time 18 ns
s Typical power dissipation (enabled)
Inverting
130 mW
Noninverting 135 mW
Ordering Code:
Order Number Package Number
Package Description
DM74LS240WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74LS240SJ
M20D
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74LS240N
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
DM74LS241WM
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74LS241N
N20A
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
© 2000 Fairchild Semiconductor Corporation DS006411
DM74LS241
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

74LS240 Datasheet

Octal 3-STATE Buffer/Line Driver/Line Receiver

No Preview Available !

Function Tables
DM74LS240
Inputs
GA
LL
LH
HX
Output
Y
H
L
Z
L = LOW Logic Level
H = HIGH Logic Level
X = Either LOW or HIGH Logic Level
Z = High Impedance
DM74LS241
Inputs
Outputs
G G 1A 2A 1Y 2Y
XLLXL
X L HXH
XHXXZ
HXX L
L
HXXH
H
LXXX
Z
www.fairchildsemi.com
2


Part Number 74LS240
Description Octal 3-STATE Buffer/Line Driver/Line Receiver
Maker Fairchild Semiconductor
PDF Download

74LS240 Datasheet PDF






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