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
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INTRODUCTION
1.13 VDD/VSS Rules and Guidelines
SEC ASIC
1-20
STDH90/MDL90
formula.
The number of power pads for total SSO groups from the following
NVDDO
sso
=
NVDDO
each_sso
NVSSO
sso
=
NVSSO
each_sso
in the above formula,
NVDDO
sso
= the number of VDDO pads required for total SSO groups
NVSSO
sso
= the number of VSSO pads required for total SSO groups
The number of power pads for non-SSO group from the following formula.
N
NSvddo
= I
eq_o
/ I
em
N
NSvsso
= I
eq_o
/ I
em
in the above formula,
I
eq_o
=
(C
load
x V x F x P)
non-SSO
C
load
: output load capacitance
V : operating voltage
F : operating frequency
P : I/O switching percent(marginal=0.5)
I
em
: Current density based on electro-migration rule(100mA)
The total number of power pads for VDDO from the following formula.
|| ∑
(number_of_SSO x L
lead
) / (D
sso_mode
x NB
vdd
) + I
eq_o
/ I
em
|| round-up
The total number of power pads for VSSO from the following formula.
|| ∑
(number_of_SSO x L
lead
) / (D
sso_mode
x NB
vss
)+ I
eq_o
/ I
em
) || round-up
If you use open-drain type buffers, you can consider only VSSO power pads
because they have only current sink.
Table 1-5. NBvdd/NBvss Parameter
(Condition : Process=best , Voltage=5.25V , Temp=0
C , Cload=30pF)
Buffer
Type
Normal
Medium
High
NBvdd
170
84
39
28
23
19
NBvss
116
55
28
20
16
13
NBvdd
NBvss
NBvdd
NBvss
B2
B4
B8
B12
B16
B24
89
40
30
24
20
58
29
21
17
14
31
26
22
22
18
15
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