(China (Mainland))
Product Summary
The SN74HC257DR is a quadruple 2-line to 1-line data selector/multiplexer. The SN74HC257DR is 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 at a 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.
Parametrics
SN74HC257DR absolute maximum ratings: (1)Supply voltage range, VCC: -0.5 V to 7 V; (2)Input clamp current, IIK (VI < 0 or VI > VCC): ±20 mA; (3)Output clamp current, IOK (VO < 0 or VO > VCC): ±20 mA; (4)Continuous output current, IO (VO = 0 to VCC): ±35 mA; (5)Continuous current through VCC or GND: ±70 mA; (6)Package thermal impedance, θJA (see Note 1): D package: 73℃/W; N package: 67℃/W; NS package: 64℃/W; PW package: 108℃/W; (7)Storage temperature range, Tstg: -65℃ to 150℃.
Features
SN74HC257DR features: (1)Wide Operating Voltage Range of 2 V to 6 V; (2)High-Current Inverting Outputs Drive Up To 15 LSTTL Loads; (3)Low Power Consumption, 80-μA Max ICC; (4)’HC257: Typical tpd = 9 ns; (5)’HC258: Typical tpd = 12 ns; (6)±6-mA Output Drive at 5 V; (7)Low Input Current of 1 μA Max; (8)Provides Bus Interface from Multiple Sources in High-Performance Systems.
Diagrams
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 SN74HC257DR |
Texas Instruments |
Encoders, Decoders, Multiplexers & Demultiplexers Quad 2-to-1 Data Slct/Mltpx W/3St Otp |
Data Sheet |
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SN74HC257DRE4 |
Texas Instruments |
Encoders, Decoders, Multiplexers & Demultiplexers Quad 2-to-1 Data Slct/Mltpx W/3St Otp |
Data Sheet |
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SN74HC257DRG4 |
Texas Instruments |
Encoders, Decoders, Multiplexers & Demultiplexers Quad 2-to-1 Data Slct/Mltpx W/3St Otp |
Data Sheet |
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