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54LS245 데이터시트(PDF) 1 Page - National Semiconductor (TI) |
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54LS245 데이터시트(HTML) 1 Page - National Semiconductor (TI) |
1 / 6 page TLF6413 June 1989 54LS245DM54LS245DM74LS245 TRI-STATE Octal Bus Transceiver General Description These octal bus transceivers are designed for asynchro- nous 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 Y Bi-Directional bus transceiver in a high-density 20-pin package Y TRI-STATE outputs drive bus lines directly Y PNP inputs reduce DC loading on bus lines Y Hysteresis at bus inputs improve noise margins Y Typical propagation delay times port-to-port 8 ns Y Typical enabledisable times 17 ns Y IOL (sink current) 54LS 12 mA 74LS 24 mA Y IOH (source current) 54LS b 12 mA 74LS b 15 mA Y Alternate MilitaryAerospace device (54LS245) is avail- able Contact a National Semiconductor Sales Office Distributor for specifications Connection Diagram Dual-In-Line Package TLF6413 – 1 Order Number 54LS245DMQB 54LS245FMQB 54LS245LMQB DM54LS245J DM54LS245W DM74LS245WM or DM74LS245N See NS Package Number E20A J20A M20B N20A or W20A Function Table Enable Direction Operation G Control DIR L L B data to A bus L H A data to B bus H X Isolation H e High Level L e Low Level X e Irrelevant TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation RRD-B30M105Printed in U S A |
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