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| 型號： | 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)： | 24/122頁 |
| 文件大小： | 277K |
| 代理商： | STDH90 |
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INTRODUCTION
1.13 VDD/VSS Rules and Guidelines
SEC ASIC
1-18
STDH90/MDL90
Table 1-3. leq_p(at F=100MHz) value of each input buffer and
output pre-driver.
Table 1-3(a). leq_p(at F=100MHz) value of each type of input buffer
Table 1-3(b). leq_p(at F=100MHz) value of each type of output
pre-driver
If buffer type is bi-directional, then you should combine the proper input buffer
and output pre-driver leq_p value.
For reliable device operation and minimum IR voltage drop, minimum number
of VSSP/VDDP pad pairs is 4.
In order to minimize number of power pads, you may use combined power pad.
You can get the combined power pad pairs VDDIP/VSSIP from the following
formula.
The number of VDDIP/VSSIP pad pairs =
|| (G x S x F x GC
eq_current
) + {
∑
(P_i x F_i)} / I
em
+ Ieq_p / I
em
|| round-up
For reliable device operation and minimum IR voltage drop, minimum number
of VSSIP/VDDIP pad pairs is 4.
1.13.4 Output Buffer V
DD
/V
SS
Pad VDDO/VSSO Allocation
Guidelines
SSO(Simultaneous Switching Output) current induced in power and ground
inductance can cause system failure because of voltage fluctuations. In case of
output driver power pad calculation, we consider the SSO noise as well as
current limit based on electro-migration. We may define SSO as outputs are
considered to be simultaneous in 1ns window such as bus type buffers.
The number of VDDO/VSSO pads required for a device can be calculated
from the following expressions.
The number of power pads for each SSO group from the following formula.
NVDDO
each_sso
= (number_of_SSO x L
lead
) / (D
sso_mode
x NB
vdd
)
NVSSO
each_sso
= (number_of_SSO x L
lead
) / (D
sso_mode
x NB
vss
)
in the above formula,
Input Buffer Type
CMOS
CMOS
Schmitt
0.45
TTL
TTL
Schmitt
0.53
Ieq_p(mA)
0.37
0.30
Output
Slew-Rate Type
Ieq_p(mA)
Normal
Medium
High
1.0
1.2
1.8
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