CD74HC251中文资料具有三态输出的高速 CMOS 逻辑 8 输入多路复用器数据手册TI规格书

描述 Description

The ’HC251 and ’HCT251 are 8-channel digital multiplexers with three-state outputs, fabricated with high-speed silicon-gate CMOS technology. Together with the low power consumption of standard CMOS integrated circuits, they possess the ability to drive 10 LSTTL loads. The three-state feature makes them ideally suited for interfacing with bus lines in a bus-oriented system.

This multiplexer features both true (Y) and complement (Y\\) outputs as well as an output enable (OE\\) input. The OE\\ must be at a low logic level to enable this device. When the OE\\ input is high, both outputs are in the high-impedance state. When enabled, address information on the data select inputs determines which data input is routed to the Y and Y\\ outputs. The ’HCT251 logic family is speed, function, and pin-compatible with the standard ’LS251.

特性 Features

• Selects One of Eight Binary Data Inputs
• True and Complement Outputs
• Fanout (Over Temperature Range)
• Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55°C to 125°C
• Significant Power Reduction Compared to LSTTL Logic ICs
• HC Types
• High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V
• HCT Types
• Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
• CMOS Input Compatibility, Il 1µA at VOL, VOH