Datasheet 搜索 > Micron（镁光） > MT48LC4M32B2B5-6 数据手册 > MT48LC4M32B2B5-6 其他数据使用手册 6/25 页
器件3D模型￥ 0
MT48LC4M32B2B5-6 其他数据使用手册 - Micron（镁光）
制造商:
Micron（镁光）
封装:
VFBGA
Pictures:
3D模型
符号图
焊盘图
引脚图
产品图
MT48LC4M32B2B5-6数据手册
Page:
of 25 Go
若手册格式错乱，请下载阅览PDF原文件
SI fundamentals and STM32 signals AN4803
6/25 DocID028793 Rev 1
The signals on a transmission line will travel at a speed that depends on the surrounding
medium. The propagation delay is the inverse of propagation velocity.
Equation1:
Equation 2:
Where:
• v: propagation velocity, in meters/second
• c: speed of light in a vacuum (3 × 10
8
m/s)
• ε
r
: dielectric constant
• TD: time delay for a signal to propagate down a transmission line of length x
The propagation delay can also be determined from the equivalent circuit model of the
transmission line:
Equation 3:
Where:
• TD: is the time delay for a signal to propagate down a transmission line of length x
• L: is the total series inductance for the length of the line
• C: is the total shunt capacitance for the length of the line.
The propagation delay is about 3.5 ps/mm in air where the dielectric constant is 1.0. In FR-
4 PCBs, the propagation delay is about 7 to 7.5 ps/mm and the dielectric constant is 3.9 to
4.5.
The PCB traces act as transmission lines when the line delay is equal to or greater than 1/6
the rise (or fall) time.
The critical length equals 1/6 of the transition electrical length, and the transition
electrical length equals to the rise (or fall) times x1/(propagation delay).
Example: For a 2 nanosecond rise time the critical length is 47.6 mm.
v
c
ε
r
--------=
TD
ε
r
c
--------=
TD LC=
器件 Datasheet 文档搜索
AiEMA 数据库涵盖高达 72,405,303 个元件的数据手册，每天更新 5,000 多个 PDF 文件
