深圳市广辉电子有限公司

1. General description   概述
The 74HC4051; 74HCT4051 is a high-speed Si-gate CMOS device and is pin compatible
with Low-power Schottky TTL (LSTTL). The device is specified in compliance with JEDEC
standard no. 7A.
The 74HC4051; 74HCT4051 is an 8-channel analog multiplexer/demultiplexer with three
digital select inputs (S0 to S2), an active-LOW enable input (E), eight independent
inputs/outputs (Y0 to Y7) and a common input/output (Z).
With E LOW, one of the eight switches is selected (low impedance ON-state) by S0 to S2.
With E HIGH, all switches are in the high-impedance OFF-state, independent of S0 to S2.
VCC and GND are the supply voltage pins for the digital control inputs (S0 to S2, and E).
The VCC to GND ranges are 2.0 V to 10.0 V for 74HC4051 and 4.5 V to 5.5 V for
74HCT4051. The analog inputs/outputs (Y0 to Y7, and Z) can swing between VCC as a
positive limit and VEE as a negative limit. VCC - VEE may not exceed 10.0 V.
For operation as a digital multiplexer/demultiplexer, VEE is connected to GND (typically
ground).

74HC4051是一款高速CMOS器件，74HC4051引脚兼容低功耗肖特基TTL（LSTTL）系列。74HC4051遵循JEDEC标准no.7A。
　　74HC4051是8通道模拟多路选择器/多路分配器，带有3个数字选择端（S0至S2），1个低有效使能端（E），8个独立输入/输出端（Y0至Y7）和1个公共输入/输出端（Z）。
　　E为低时，8个开关的其中之一将被S0至S2选中（低阻态）。E为高时，所有开关都进入高阻态，直接无视S0至S2。
　　V_CC和GND是数字控制端（S0至S2，E）的供电引脚，74HC4051的V_CC至GND范围为2.0 V～10.0 V。74HC4051的模拟输入/输出端（Y0至Y7，Z）在上限V_CC和下限V_EE之间摆动，V_CC-V_EE应当不超过10.0 V。
　　作为一个数字多路选择器/多路分配器，V_EE将被连接到GND上（一般是接地）。

2. Features  特性
n Wide analog input voltage range: ±5 V
n Low ON-state resistance:
u 80 W (typical) at VCC - VEE = 4.5 V
u 70 W (typical) at VCC - VEE = 6.0 V
u 60 W (typical) at VCC - VEE = 9.0 V
n Logic level translation:
u To enable 5 V logic to communicate with ±5 V analog signals
n Typical ‘break before make’ built in