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參數(shù)資料
| 型號(hào)： | STDH90 |
| 英文描述： | Leaded Cartridge Fuse; Current Rating:62.5mA; Voltage Rating:250V; Fuse Terminals:Axial Lead; Fuse Type:Time Delay; Voltage Rating:250V; Body Material:Ceramic; Diameter:6.985mm; Fuse Size/Group:1/4 x 1-1/4 " RoHS Compliant: Yes |
| 中文描述： | STDH90 0.35微米STDH90圖書館|數(shù)據(jù)資料 |
| 文件頁數(shù)： | 22/122頁 |
| 文件大小： | 277K |
| 代理商： | STDH90 |
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Introduction
1.13 VDD/VSS Rules and Guidelines
SEC ASIC
1-16
STDH90/MDL90
1.13
VDD/VSS Rules
and Guidelines
There are three types of V
DD
and V
SS
in STDH90/MDL90, providing power with
internal and I/O pad area.
Core logic
– VDD3I, VSSI
Pre-drive (I/O area)
– VDD5P, VSSP
Output-drive (I/O area)
– VDD5O, VSSO
The number of V
DD
and V
SS
pads required for a specific design depends on the
following factors:
Number of input and output buffers
Number of simultaneous switching outputs
Number of used gates and simultaneous switching gates
Operating frequency of the design.
1.13.1 Basic Placement Guidelines
The purpose of these guidelines is to minimize IR drop and noise for reliable
device operation.
on all sides of the chip.
Core logic and pre-driver Vdd/Vss pads should be evenly distributed
, extra power pads should be placed on that side.
If you have core block demanding high power(compiled memory,analog)
Power pads for SSO group should be evenly distributed in the SSO group.
group.
Do not place the high drive output or bi-directional buffer next to a SSO
Same type power pads(Vdd/Vdd,Vss/Vss) should be separated. These
two placement scheme will reduce the mutual inductance of lead of power
pads.
Opposite type power pads(Vdd/Vss) should be placed as close as possible.
1.13.2 Core Logic V
DD
/V
SS
Bus and VDDI/VSSI Pad
Allocation Guidelines
The purpose of these guidelines is to ensure that minimum number of core logic
power pad pairs requirement based on electro-migration current limit. The
number of V
DD
/V
SS
pads required for a specific design is the function of the
operating frequency of a chip, i.e., designs operating at high frequency should
use more V
DD
/V
SS
pads.
V
DD
bus width and pad requirements are equal to those of V
SS
.
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相關(guān)代理商/技術(shù)參數(shù) |
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| STDHCA-1.024 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Crystal Oscillator |
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| STDHCA-11.2896 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Crystal Oscillator |
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