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SN74LVC257ANSR 数据表(PDF) 10 Page - Texas Instruments |
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SN74LVC257ANSR 数据表(HTML) 10 Page - Texas Instruments |
10 / 30 page 4Y 3Y 2Y 1Y A/B OE 4B 4A 3B 3A 2B 2A 1B 1A 4 2 3 7 5 6 9 11 10 12 14 13 1 15 SN54LVC257A, SN74LVC257A SCAS294O – JANUARY 1993 – REVISED JUNE 2015 www.ti.com 9 Detailed Description 9.1 Overview These quadruple 2-line to 1-line data selectors and multiplexers are designed for 1.65-V to 3.6-V VCC operation. The SNx4LVC257A 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 a high logic level. 9.2 Functional Block Diagram 9.3 Feature Description Inputs can be driven from either 3.3-V or 5-V devices. This feature allows the use of these devices as translators in a mixed 3.3-V and 5-V system environment. Device features a maximum tpd of 4.6 ns allowing the device to be used in high-speed applications as well. To ensure the high-impedance state during power up or power down, OE must be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver. 9.4 Device Functional Modes Table 1 lists the functional modes for the SN54LVC257A and SN74LVC257A devices. Table 1. Function Table INPUTS OUTPUT Y OE A/B A B H X X X Z L L L X L L L H X H L H X L L L H X H H 10 Submit Documentation Feedback Copyright © 1993–2015, Texas Instruments Incorporated Product Folder Links: SN54LVC257A SN74LVC257A |
类似零件编号 - SN74LVC257ANSR |
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类似说明 - SN74LVC257ANSR |
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