器件名称:
74245
功能描述:
3-STATE Octal Bus Transceiver
文件大小:
66.49KB 共6页
简 介:
DM74LS245 3-STATE Octal Bus Transceiver August 1986 Revised March 2000 DM74LS245 3-STATE Octal Bus Transceiver General Description These octal bus transceivers are designed for asynchronous two-way communication between data buses. The control function implementation minimizes external timing requirements. The device allows data transmission from the A Bus to the B Bus or from the B Bus to the A Bus depending upon the logic level at the direction control (DIR) input. The enable input (G) can be used to disable the device so that the buses are effectively isolated. Features s Bi-Directional bus transceiver in a high-density 20-pin package s 3-STATE outputs drive bus lines directly s PNP inputs reduce DC loading on bus lines s Hysteresis at bus inputs improve noise margins s Typical propagation delay times, port-to-port 8 ns s Typical enable/disable times 17 ns s IOL (sink current) 24 mA s IOH (source current) 15 mA Ordering Code: Order Number DM74LS245WM DM74LS245SJ DM74LS245N Package Number M20B M20D N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 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 Diagram Function Table Enable G L L H H = HIGH Level L = LOW Level X = Irrelevant Direction Control DIR L H X Operation B Data……
