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54LS257A Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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54LS257A Datasheet(HTML) 1 Page - National Semiconductor (TI) |
1 / 8 page TLF6417 June 1989 54LS257ADM54LS257BDM74LS257B 54LS258ADM54LS258BDM74LS258B TRI-STATE Quad 2-Data SelectorsMultiplexers General Description These Schottky-clamped high-performance multiplexers feature TRI-STATE outputs that can interface directly with data lines of bus-organized systems With all but one of the common outputs disabled (at a high impedance state) the low impedance of the single enabled output will drive the bus line to a high or low logic level To minimize the possibil- ity that two outputs will attempt to take a common bus to opposite logic levels the output enable circuitry is designed such that the output disable times are shorter than the out- put enable times This TRI-STATE output feature means that n-bit (paralleled) data selectors with up to 258 sources can be implemented for data buses It also permits the use of standard TTL reg- isters for data retention throughout the system Features Y TRI-STATE versions LS157 and LS158 with same pin- outs Y Schottky-clamped for significant improvement in A-C performance Y Provides bus interface from multiple sources in high- performance systems Y Average propagation delay from data input 12 ns Y Typical power dissipation LS257B 50 mW LS258B 35 mW Y Alternate militaryaerospace devices (54LS257A 54LS258A) are available Contact a National Semicon- ductor Sales OfficeDistributor for specifications Connection Diagrams Dual-In-Line Package TLF6417 – 1 Order Number 54LS257ADMQB 54LS257AFMQB 54LS257ALMQB DM54LS257BJ DM54LS257BW DM74LS257BM or DM74LS257BN See NS Package Number E20A J16A M16A N16E or W16A Dual-In-Line Package TLF6417 – 2 Order Number 54LS258ADMQB 54LS258AFMQB 54LS258ALMQB DM54LS258BJ DM54LS258BW DM74LS258BM or DM74LS258BN See NS Package Number E20A J16A M16A N16E or W16A Function Table Inputs Output Y Output Select A B LS257 LS258 Control HX X X Z Z LL L X L H LL H X H L LH X L L H LH X H H L H e High Level L e Low Level X e Don’t Care Z e High Impedance (off) TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation RRD-B30M105Printed in U S A |
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