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SN74HCT257DT Datasheet(PDF) 1 Page - Texas Instruments |
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SN74HCT257DT Datasheet(HTML) 1 Page - Texas Instruments |
1 / 9 page SN54HCT257, SN74HCT257 QUADRUPLE 2LINE TO 1LINE DATA SELECTORS/MULTIPLEXERS WITH 3STATE OUTPUTS SCLS072D − NOVEMBER 1988 − REVISED SEPTEMBER 2003 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D Operating Voltage Range of 4.5 V to 5.5 V D High-Current 3-State Outputs Interface Directly With System Bus D Typical tpd = 17 ns D Low Power Consumption, 80-µA Max ICC D ±6-mA Output Drive at 5 V D Low Input Current of 1 µA Max D Inputs Are TTL-Voltage Compatible D Provide Bus Interface From Multiple Sources in High-Performance Systems D Buffered Inputs and Outputs 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 A/B 1A 1B 1Y 2A 2B 2Y GND VCC OE 4A 4B 4Y 3A 3B 3Y SN54HCT257 ... J PACKAGE SN74HCT257 ...D OR N PACKAGE (TOP VIEW) 32 1 20 19 910 11 1213 4 5 6 7 8 18 17 16 15 14 4A 4B NC 4Y 3A 1B 1Y NC 2A 2B SN54HCT257 . . . FK PACKAGE (TOP VIEW) NC − No internal connection description/ordering information The ’HCT257 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 (OE) input is at the high logic level. To ensure the high-impedance state during power up or power down, OE 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. ORDERING INFORMATION TA PACKAGE† ORDERABLE PART NUMBER TOP-SIDE MARKING PDIP − N Tube of 25 SN74HCT257N SN74HCT257N −40 °C to 85°C Tube of 40 SN74HCT257D −40 °C to 85°C SOIC − D Reel of 2500 SN74HCT257DR HCT257 SOIC − D Reel of 250 SN74HCT257DT HCT257 −55 °C to 125°C CDIP − J Tube of 25 SNJ54HCT257J SNJ54HCT257J −55 °C to 125°C LCCC − FK Tube of 55 SNJ54HCT257FK SNJ54HCT257FK † Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Copyright 2003, Texas Instruments Incorporated UNLESS OTHERWISE NOTED this document contains PRODUCTION DATA information current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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