MC74LVX259数据手册集成电路（IC）的锁存器规格书PDF

描述 Description

The MC74LVX259 is an 8-bit Addressable Latch fabricated with silicon gate CMOS technology.The internal circuit is composed of three stages, including a buffer output which provides high noise immunity and stable output.The LVX259 is designed for general purpose storage applications in digital systems. The device has four modes of operation as shown in the mode selection table.. In the addressable latch mode, the data on Data In is written into the addressed latch. The addressed latch follows the data input with all non-addressed latches remaining in their previous states. In the memory mode, all latches remain in their previous state and are unaffected by the Data or Address inputs. In theone-of-eight decoding or demultiplexing mode, the addressed output follows the state of Data In with all other outputs in the LOW state. In the Reset mode, all outputs are LOW and unaffected by the address and data inputs. When operating the LVX259 as an addressable latch, changing more than one bit of the addressould impose a transient wrong address. Therefore, this should only be done while in thememory mode. The MC74LVX259 input structure provides protection when voltages up to 7 V are applied, regardless of the supply voltage. This allows the MC74LVX259 to be used to interface 5 V circuits to 3 V circuits.

特性 Features

• High Speed: tPD = 7.0 ns (Typ) at VCC = 3.3 V
• Low Power Dissipation: ICC = 2 µA (Max) at TA = 25°C
• High Noise Immunity: VNIH = VNIL = 28% VCC
• CMOS-Compatible Outputs: VOH > 0.8 VCC ; VOL CC @Load
• Power Down Protection Provided on Inputs and Outputs
• Balanced Propagation Delays
• Pin and Function Compatible with Other Standard Logic Families
• Latchup Performance Exceeds 300 mA
• ESD Performance: HBM > 2000 V; Machine Model > 200 V
• Pb-Free Packages are Available*

简介

MC74LVX259属于集成电路（IC）的锁存器。由制造生产的MC74LVX259锁存器锁存器是类似于触发器的基本数字存储设备，但是不同之处在于，在锁存使能（或类似命名）信号处于有效逻辑状态的任何时间，保持的逻辑状态都可以改变。“透明”锁存器还允许设备输出在锁存使能信号有效时反映输入的当前状态，而相反的是，状态仅在保持状态已固定时改变。