Spec

• These devices are designed to multiplex signals from 4-bit data sources to 4-output data lines in bus-organized systems.　The 3-state outputs do not load the data lines when the output-enable (G\) input is ata high logic level. To ensure the high-impedance state during power up or power down, (G\) should be tied to VCC through a pullup resistor; The minimum value of the resistor is determined by the current-sinking capability of the driver. Wide Operating Voltage Range of 2 V to 6 VHigh-Current Inverting Outputs Drive up to 15 LSTTL LoadsLow Power Consumption, 80-μA Max ICC'HC257 ...Typical tpd = 9 ns'HC258 ...Typical tpd = 12 ns±6-mA Output Drive at 5 VLow Input Current of 1 μA MaxProvides Bus Interface from Multiple Sources in High-Performance Systems
• FunctionEncoder/Multiplexer
• VCC (V)2 to 6
• Channels(#)4
• Voltage(Nom)(V)3.3
• 5
• @ Nom Voltage(Max)(Mhz)28
• ICC @ Nom Voltage(Max)(mA)0.08
• tpd @ Nom Voltage(Max)(ns)25
• Configuration2:1
• Type3-State Output
• Output Drive (IOL/IOH)(Max)(mA)7.8/-7.8
• Bits(#)2
• Operating Temperature Range (C)-40 to 85
• Pin/Package16-DIP
• RoHS Compliance
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