SN74ABT240ADWR

These octal buffers and line drivers are designed specifically to improve both the performance and density of 3 - state memory address drivers, clock drivers, and bus - oriented receivers and transmitters. Together with the SN54ABT241, SN74ABT241A, SN54ABT244, and SN74ABT244A, these devices provide the choice of selected combinations of inverting and noninverting outputs, symmetrical active - low output - enable (OE(overline)) inputs, and complementary OE and OE(overline) inputs. The SN54ABT240 and SN74ABT240A are organized as two 4 - bit buffers/line drivers with separate C(overline) inputs. When C(overline) is low, the devices pass inverted data from the A inputs to the Y outputs. When OE(overline) is high, the outputs are in the high - impedance state. This device is fully specified for partial - power - down applications using Ioff. The Ioff circuitry disables the outputs, preventing damaging current backflow through the device when it is powered down. To ensure the high - impedance state during power up or power down, OC(overline) should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current - sinking capability of the driver.

Applications

• Three-state memory address driving
• Clock driving
• Bus-oriented receiver and transmitter systems

Key features

• Typical output ground bounce voltage < 1V at VCC = 5V and ambient temperature 25°C
• High drive output capability: source current -32mA, sink current 64mA
• Half power-down mode operation supported
• Latch-up performance exceeds 500mA, compliant with JEDEC standard JESD-17
• ESD protection compliant with JESD 22: Human Body Model up to 2000V, Machine Model up to 200V
• Maximum ratings: VCC -0.5V~7V, input voltage -0.5V~7V, output voltage in high-impedance or power-down state -0.5V~5.5V
• Output current at low level: SN54ABT240 96mA, SN74ABT240A 128mA, output clamp current -50mA
• Thermal resistance by package: DB package 70°C/W, DW package 58°C/W, N package 69°C/W, NS package 60°C/W, PW package 83°C/W
• Storage temperature range: -65°C~150°C