74LVC374A中文资料Standard-logic数据手册Diodes规格书

描述 Description

The 74LVC374A provides eight edge-triggered D-type flip-flops featuring 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance loads. These devices are particularly suitable for implementing buffer registers, input/output (I/O) ports, bidirectional bus drivers, and working registers. On the positive transition of the clock (CLK) input, the Q outputs are set to the logic levels set up at the data (D) inputs. A buffered output-enable (OE) input can be used to place the eight outputs in either a normal logic state (high or low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines without interface or pullup components. OE does not affect internal operations of the latch. Old data can be retained or new data can be entered while the outputs are in the high-impedance state.

\tThe ‘374A is functionally identical to the ‘574A, but the ’574 has a different pin arrangement.

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

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•Exceeds 200-V Machine Model (A115) 
•Exceeds 2000-V Human Body Model (A114) 
•Exceeds 1000-V Charged Device Model (C101) 

•Latch-Up Exceeds 250mA per JESD 78, Class I 
•All devices are:•Totally Lead-Free & Fully RoHS compliant (Notes 1 & 2) 
•Halogen and Antimony Free. “Green” Device (Note 3) 

应用 Application

•
\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\tƒPCs, 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

74LVC374A属于集成电路（IC）的触发器。由制造生产的74LVC374A触发器触发器是能够存储单个逻辑状态或信息“位”的基本数字存储器件。这些器件至少有两个输入；一个或多个用于传递要存储的数据，另一个用于指示存储该数据的时间点。不同的触发器类型，例如 D（延迟）、SR（置位复位）和 JK，对提供给其输入的信号有不同的响应，可用于实现不同的逻辑功能。这些器件与锁存器的不同之处在于它们是边缘敏感器件，其保持的逻辑状态仅在接收到有效时钟信号时才会改变。