SN74LS240DWR

These octal buffers and line drivers are designed specifically to improve both the performance and density of three- state memory address drivers, clock drivers, and bus- oriented receivers and transmitters. The designer has a choice of selected combinations of inverting and noninverting outputs, symmetrical, active- low output- control (G(overline)) inputs, and complementary output- control (G(overline) and G(overline)) inputs. These devices feature high fan- out, improved fan- in, and 400 - mV noise margin. The SN74LS' and SN74S' devices can be used to drive terminated lines down to 133Ω.

Applications

• Three-state memory address driver
• Clock driver
• Bus-oriented receiver
• Bus-oriented transmitter

Key features

• Three-state outputs for driving bus lines or buffering memory address registers
• PNP inputs to reduce DC loading
• Hysteresis on inputs for improved noise immunity
• High fan-out with optimized fan-in; noise immunity up to 400mV
• Corresponding versions capable of driving termination lines with impedance as low as 133Ω
• Multiple series and package options: SN54LS, SN54S, SN74LS, SN74S series; available in J, W, DB, DW, N, NS, FK packages
• Absolute maximum ratings: supply voltage VCC 7V; LS series input voltage max 7V; S series input voltage max 5.5V; off-state output voltage max 5.5V
• Storage temperature range: -65℃ to 150℃
• Package thermal resistance (nominal): DB package 70℃/W, DW package 58℃/W, N package 69℃/W, NS package 60℃/W
• G and complementary G input nominal equivalent resistance 2kΩ; A input nominal equivalent resistance 2.8kΩ
• LS series output nominal resistance 50Ω; S series output nominal resistance 25Ω