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*

簡(jiǎn)介

MC74LVX259屬于集成電路（IC）的鎖存器。由制造生產(chǎn)的MC74LVX259鎖存器鎖存器是類(lèi)似于觸發(fā)器的基本數(shù)字存儲(chǔ)設(shè)備，但是不同之處在于，在鎖存使能（或類(lèi)似命名）信號(hào)處于有效邏輯狀態(tài)的任何時(shí)間，保持的邏輯狀態(tài)都可以改變?！巴该鳌辨i存器還允許設(shè)備輸出在鎖存使能信號(hào)有效時(shí)反映輸入的當(dāng)前狀態(tài)，而相反的是，狀態(tài)僅在保持狀態(tài)已固定時(shí)改變。