器件名称:
54LS244DMQB
功能描述:
Octal TRI-STATEE Buffers/Line Drivers/Line Receivers
文件大小:
139.44KB 共6页
简 介:
54LS244 DM74LS244 Octal TRI-STATE Buffers Line Drivers Line Receivers August 1989 54LS244 DM74LS244 Octal TRI-STATE Buffers Line Drivers Line Receivers General Description These buffers line drivers are designed to improve both the performance and PC board density of TRI-STATE buffers drivers employed as memory-address drivers clock drivers and bus-oriented transmitters receivers Featuring 400 mV of hysteresis at each low current PNP data line input they provide improved noise rejection and high fanout outputs and can be used to drive terminated lines down to 133X Y Y Y Features Y Y Y Y Y TRI-STATE outputs drive bus lines directly PNP inputs reduce DC loading on bus lines Hysteresis at data inputs improves noise margins Typical IOL (sink current) 54LS 12 mA 74LS 24 mA Typical IOH (source current) b 12 mA 54LS b 15 mA 74LS Typical propagation delay times Inverting 10 5 ns Noninverting 12 ns Typical enable disable time 18 ns Typical power dissipation (enabled) Inverting 130 mW Noninverting 135 mW Connection Diagram Dual-In-Line Package TL F 8442 – 1 Order Number 54LS244DMQB 54LS244FMQB 54LS244LMQB DM74LS244WM or DM74LS244N See NS Package Number E20A J20A M20B N20A or W20A Function Table Inputs G L L H A L H X Output Y L H Z L e Low Logic Level H e High Logic Level X e Either Low or High Logic Level Z e High Impedance TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation TL F 8442 RRD-B30M105 Printed in……
