描述 Description

The MC74VHCT74A is an advanced high speed CMOS D-type flip-flop fabricated with silicon gate CMOS technology. It achieves high speed operation similar to equivalent Bipolar Schottky TTL while maintaining CMOS low power dissipation. The signal level applied to the D input is transferred to Q output during the positive going transition of the Clock pulse. Reset (RD) and Set (SD) are independent of the Clock (CP) and are accomplished by setting the appropriate input Low. The internal circuit is composed of three stages, including a buffer output which provides high noise immunity and stable output. The inputs tolerate voltages up to 7V, allowing the interface of 5V systems to 3V systems. The VHCT inputs are compatible with TTL levels. This device can be usedas a level converter for interfacing 3.3V to 5.0V, because it has full 5V CMOS level output swings. The VHCT74A input structures provide protection when voltages between 0V and 5.5V are applied, regardless of the supply voltage. The output structures also provide protection when VCC=0V. These input and output structures help prevent device destruction caused by supply voltage -input/output voltage mismatch, battery backup, hot insertion, etc.

特性 Features

? High Speed: fmax = 60MHz (Typ) at VCC = 5V
? Low Power Dissipation: ICC = 2 A (Max) at TA = 25°C
? Power Down Protection Provided on Inputs
? Balanced Propagation Delays
? Designed for 4.5V to 5.5V Operating Range
? Low Noise: VOLP = 0.8V (Max)
? Pin and Function Compatible with Other Standard Logic Families
? Latchup Performance Exceeds 300mA
? ESD Performance: HBM > 2000V; Machine Model > 200V
? Chip Complexity: 128 FETs or 32 Equivalent Gates
? Pb-Free Packages are Available

簡介

MC74VHCT74A屬于集成電路（IC）的觸發(fā)器。由制造生產(chǎn)的MC74VHCT74A觸發(fā)器觸發(fā)器是能夠存儲單個邏輯狀態(tài)或信息“位”的基本數(shù)字存儲器件。這些器件至少有兩個輸入；一個或多個用于傳遞要存儲的數(shù)據(jù)，另一個用于指示存儲該數(shù)據(jù)的時間點。不同的觸發(fā)器類型，例如 D（延遲）、SR（置位復(fù)位）和 JK，對提供給其輸入的信號有不同的響應(yīng)，可用于實現(xiàn)不同的邏輯功能。這些器件與鎖存器的不同之處在于它們是邊緣敏感器件，其保持的邏輯狀態(tài)僅在接收到有效時鐘信號時才會改變。