CD74HCT251数据手册集成电路（IC）的信号开关多路复用器解码器规格书PDF

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
• Three-State Output Capability
• True and Complement Outputs
• Typical (Data to Output) Propagation Delay of 14ns at VCC = 5V, CL = 15pF, TA = 25°C
• Fanout (Over Temperature Range)
• Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
• Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads

• Wide Operating Temperature Range . . . -55°C to 125°C
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL Logic ICs
• Alternate Source is Philips
• HC Types
• 2V to 6V Operation
• High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V

• HCT Types
• 4.5V to 5.5V Operation
• Direct LSTTL Input Logic Compatibility, VIL = 0.8V (Max), VIH = 2V (Min)
• CMOS Input Compatibility, Il 1µA at VOL, VOH