DM74ALS1240A

DM74ALS1240A Octal 3-STATE Bus Driver September 1986 Revised February 2000 DM74ALS1240A Octal 3-STATE Bus Driver General Description These octal 3-STATE bus drivers are designed to provide the designer with flexibility in implementing a bus interface with memory, microprocessor, or communication systems, and are low power dissipation versions of the DM74ALS240A and DM74ALS241A. The output 3-STATE gating control is organized into two separate groups of four buffers. The DM74ALS1240A control inputs symmetrically enable the respective outputs when set logic LOW. The 3STATE circuitry contains a feature that maintains the buffer outputs in 3-STATE (high impedance state) during power supply ramp-up or ramp-down. This eliminates bus glitching problems that arise during power-up and power-down. Features s Advanced oxide-isolated, ion-implanted Schottky TTL process s Switching response specified into 500Ω and 50 pF load s Switching response specifications guaranteed over full temperature and VCC supply range s PNP input design reduces input loading s Low power dissipation version s Low level drive current: 74ALS = 16 mA Ordering Code: Order Number DM74ALS1240AWM Package Number M20B Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code. Connection Diagram Logic Diagram Function Table Input G L L H A L H X Output Y H L Z H = HIGH Level...