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MM54HCT521J Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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MM54HCT521J Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 4 page  TLF9401 November 1995 MM54HCT251MM74HCT251 8-Channel TRI-STATE Multiplexer General Description This 8-channel digital multiplexer with TRI-STATE outputs utilizes advanced silicon-gate CMOS technology Along with the high noise immunity and low power consumption of standard CMOS integrated circuits it possesses the ability to drive 10 LS-TTL loads The large output drive capability and TRI-STATE feature make this part ideally suited for in- terfacing with bus lines in a bus oriented system This multiplexer features both true (Y) and complement (W) outputs as well as a STROBE input The STROBE must be at a low logic level to enable this device When the STROBE input is high both outputs are in the high impedance state When enabled address information on the data select in- puts determines which data input is routed to the Y and W outputs MM54HCTMM74HCT devices are intended to interface be- tween TTL and NMOS components and standard CMOS devices These parts are also plug-in replacements for LS- TTL devices and can be used to reduce power consumption in existing designs Features Y Typical propagation delay 20 ns Y Low quiescent current 40 mA maximum (74HCT Series) Y Low input current 1 mA maximum Y Fanout of 10 LS-TTL loads Y TTL input compatible Connection and Logic Diagrams Dual-in-Line Package TLF9401 – 1 Top View Order Number MM54HCT251 or MM74HCT251 Truth Table Inputs Outputs Select Strobe Y W CBA S XXX H Z Z L L L L D0 D0 L L H L D1 D1 L H L L D2 D2 L H H L D3 D3 H L L L D4 D4 H L H L D5 D5 H H L L D6 D6 H H H L D7 D7 H e high logic level L e logic level X e irrelevant Z e high impedance (off) D0 D1 D7 e the level of the respective D input TLF9401 – 2 TRI-STATE is a registered trademark of National Semiconductor Corporation C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A |
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