CD74HC251 - 具有三态输出的高速 CMOS 逻辑 8 输入多路复用器

CD74HC251是TI德州仪器公司的一款解码器/编码器/多路复用器产品，CD74HC251是具有三态输出的高速 CMOS 逻辑 8 输入多路复用器，本站介绍了CD74HC251的封装应用图解、特点和优点、功能等，并给出了与CD74HC251相关的TI元器件型号供参考。

CD74HC251 - 具有三态输出的高速 CMOS 逻辑 8 输入多路复用器 - 解码器/编码器/多路复用器 - 特殊逻辑 - 德州仪器

产品描述

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.

产品特性

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

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