74LVCH245A中文资料Standard-logic数据手册Diodes规格书

描述 Description

The 74LVCH245A is an octal transceiver designed for asynchronous communication between data buses. The device transmits data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) pin can be used to disable the device so the buses effectively are isolated.

\tThe device is designed for operation with a power supply range of OE 1.65V to 3.6V.

\tThe inputs are tolerant to 5.5V allowing this device to be used in a mixed voltage environment. The device is fully specified for partial power down applications using IOFF. The IOFF circuitry disables the output preventing damaging current backflow when the device is powered down.

\tBus hold circuitry holds unused or undriven inputs at a high or low logic state. The use of external pull-up or pull down resistors is not recommended.

特性 Features

•Supply Voltage Range from 1.65V to 3.6V 
•Sinks or Sources 24ma at VCC = 3V 
•CMOS Low Power Consumption 
•IOFF Supports Partial Power Down Operation 
•Inputs or Outputs Accept Up to 5.5V 
•Inputs Can Be Driven by 3.3V or 5V Allowing for Mixed Voltage Applications 
•Schmitt Trigger Action at All Inputs 
•Typical VOLP (Quiet Output Ground Bounce) Less Than 0.8V with VCC = 3.3V and TA = +25°C 
•Typical VOHV (Quiet Output dynamic VOH) Greater than 2.0V with VCC = 3.3V and TA = +25°C 
•ESD Protection Tested per JESD 22•ƒ Exceeds 200-V Machine Model (A115) 
•ƒ Exceeds 2000-V Human Body Model (A114) 
•ƒ Exceeds 1000-V Charged Device Model (C101) 

•Latch-Up Exceeds 250mA per JESD 78, Class I 
•All devices are:•ƒ Totally Lead-Free & Fully RoHS compliant  
•ƒ Halogen and Antimony Free. “Green” Device 

应用 Application

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\t\tGeneral Purpose Logic
\t•
\t\tBus Driving
\t•
\t\tPower Down Signal Isolation
\t•
\t\tWide Array of Products Such as: 
\t\t
\t\t\t•
\t\t\t\tPCs, Notebooks, Netbooks, Ultrabooks
\t\t\t•
\t\t\t\tNetworking Computer Peripherals, Hard Drives, CD/DVD ROM
\t\t\t•
\t\t\t\tTV, DVD, DVR, Set Top Box

简介

74LVCH245A属于集成电路（IC）的缓冲器驱动器接收器收发器。由制造生产的74LVCH245A缓冲器，驱动器，接收器，收发器逻辑缓冲器、驱动器、接收器和收发器允许隔离对某个电路的逻辑信号的访问，以用于另一电路。缓冲器将其输入信号（不变或反相）传递到其输出，并可能用于清除弱信号或驱动负载。在布尔逻辑仿真器中，缓冲器主要用于增加传播延迟。逻辑接收器和收发器允许在数据总线之间进行隔离通信。