SN74HCT257N .

产品概述

The SN74HCT257N is a 2-to-1 quadruple Data Selector/Multiplexer with 3-state outputs. It 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 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 pull-up resistor, the minimum value of the resistor is determined by the current-sinking capability of the driver.

• Typical tpd = 17ns
• Inputs are TTL-voltage compatible
• Provide bus interface from multiple sources in high-performance systems
• Buffered inputs and outputs
• 80µA Maximum low power consumption
• ±6mA Output drive at 5V
• 1µA Maximum low input current

应用

工业, 通信与网络