Octal TRI-STATE Buffers/Line Drivers/Line Receivers
Description
DM54LS240 DM74LS240 DM54LS241 DM74LS241 Octal TRI-STATE Buffers Line Drivers Line Receivers
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
Y
Y
Y
Features
Y Y Y
Y Y
TRI-STATE outputs drive bus lines directly PNP inputs reduce DC loading on bus lines Hysteresis at data inputs improves noise margins
Typical IOL (sink current) 54LS 12 mA 74LS 24 mA Typical IOH (source current) b 12 mA 54LS b 15 mA 74LS Typical propagation delay times Inverting 10 5 ns Noninverting 12 ns Typical enable disable time 18 ns Typical power dissipation (enabled) Inverting 130 mW Noninverting 135 mW
Connection Diagrams
Dual-In-Line Package Dual-In-Line Package
TL F 6411 – 1
TL F 6411 – 2
Order Number DM54LS240J DM54LS240W DM54LS240E DM74LS240WM or DM74LS240N See NS Package Number E20A J20A M20B N20A or W20A
Order Number DM54LS241J DM54LS241W DM54LS241E DM74LS241WM or DM74LS241N See NS Package Number E20A J20A M20B N20A or W20A
Function Tables
LS240 Inputs G L L H A L H X Output Y H L Z G X X X H H L G L L H X X X LS241 Inputs 1A L H X X X X 2A X X X L H X Outputs 1Y L H Z L H Z 2Y
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
Absolute Maximum Ratings (Note)
If Military Aerospace specified devices are required please contact the National Semiconductor Sales Office Distributors for availability and specifications S...
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