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SN74AC11478DW PDF预览

SN74AC11478DW

更新时间： 2024-11-05 15:52:03
品牌 Logo 应用领域
德州仪器 - TI 驱动光电二极管输出元件逻辑集成电路
页数 文件大小 规格书
7页 104K
描述
AC SERIES, 8-BIT DRIVER, TRUE OUTPUT, PDSO24, PLASTIC, SOIC-24

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SN74AC11478DW 技术参数

生命周期：Obsolete零件包装代码：SOIC
包装说明：SOP,针数：24
Reach Compliance Code：unknownHTS代码：8542.39.00.01
风险等级：5.84系列：AC
JESD-30 代码：R-PDSO-G24长度：15.4 mm
逻辑集成电路类型：BUS DRIVER位数：8
功能数量：1端口数量：2
端子数量：24最高工作温度：85 °C
最低工作温度：-40 °C输出特性：3-STATE
输出极性：TRUE封装主体材料：PLASTIC/EPOXY
封装代码：SOP封装形状：RECTANGULAR
封装形式：SMALL OUTLINE传播延迟（tpd）：18.4 ns
认证状态：Not Qualified座面最大高度：2.65 mm
最大供电电压 (Vsup)：5.5 V最小供电电压 (Vsup)：3 V
标称供电电压 (Vsup)：5 V表面贴装：YES
技术：CMOS温度等级：INDUSTRIAL
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUAL宽度：7.5 mm
Base Number Matches：1

SN74AC11478DW 数据手册

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SCAS182 − APRIL 1989 − REVISED APRIL 1993  
DW OR NT PACKAGE  
(TOP VIEW)  
• Specifically Designed for Data  
Synchronization Applications  
• 3-State Outputs Drive Bus Lines Directly  
1Q  
2Q  
3Q  
4Q  
GND  
GND  
GND  
GND  
5Q  
OE  
1
24  
• Flow-Through Architecture Optimizes PCB  
2
23 1D  
22 2D  
Layout  
3
4
21  
20  
19  
18  
17  
16  
15  
14  
13  
3D  
4D  
V
• Center-Pin V  
and GND Pin  
Configurations Minimize High-Speed  
Switching Noise  
CC  
5
6
CC  
7
V
CC  
•
EPIC (Enhanced-Performance Implanted  
CMOS ) 1-µm Process  
8
5D  
6D  
7D  
8D  
9
• Package Options Include Plastic  
Small-Outline Packages and Standard  
Plastic 300-mil DIPs  
10  
11  
12  
6Q  
7Q  
8Q  
CLK  
description  
The 74AC11478 is an 8-bit dual-rank synchronizer circuit designed specifically for data synchronization  
applications in which the normal setup and hold time specifications are frequently violated.  
Synchronization of two digital signals operating at different frequencies is a common system problem. This  
problem is typically solved by synchronizing one of the signals to the local clock through a flip-flop. This solution,  
however, causes the setup and hold time specifications associated with the flip-flop to be violated. When the  
setup or hold time of a flip-flop is violated, the output response is uncertain. A flip-flop is metastable if its output  
hangs up in the region between V and V . The metastable condition lasts until the flip-flop recovers into one  
IL  
IH  
of its two stable states. With conventional flip-flops, this recovery time can be longer than the specified maximum  
propagation delay.  
The problem of metastability is typically solved by adding an additional layer of synchronization. This dual-rank  
approach is employed in the 74AC11478. The probability of the second stage entering the metastable state is  
exponentially reduced by this dual-rank architecture. The 74AC11478 provides a one-chip solution for system  
designers in asynchronous applications.  
The 74AC11478 is characterized for operation from −40°C to 85°C.  
FUNCTION TABLE  
INPUTS  
OUTPUT  
Q
†
CLK  
OE  
D
H
L
L
L
X
↑
↑
L
X
L
H
X
Z
L
H
Q
0
†
Data presented at the  
D inputs  
requires two clock cycles to appear at  
the Q outputs.  
EPIC is a trademark of Texas Instruments Incorporated.  
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Copyright 1993, Texas Instruments Incorporated  
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1
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265  
POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251−1443  
1234567

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