
Introduction
1.10 VDD/VSS Rules And Guidelines
Samsung ASIC
1-39
STD130
where,
NVDDO
each_sso
= Number of VDD1O (VDD2O, 3O) pad required for each SSO group,
NVSSO
each_sso
= Number of VSS1O (VSS2O, 3O) pad required for each SSO group,
NBvdd = Number of buffers per VDD1O (VDD2O, 3O) power pad with 1nH lead inductance
(Refer to Table 1-18),
NBvss = Number of buffers per VSS1O (VSS2O, 3O) ground pad with 1nH lead inductance,
L
pg
= Package lead frame inductance of power/ground (Refer to 1.8 package capability by pitch and lead count),
D
sso_mode
= D
L_mode
×
D
P_mode
×
D
V_mode
×
D
T_mode
×
D
C_mode
(Refer to Table 1-15, Table 1-16 and Table 1-17)
D
L_mode
= Lead inductance derating factor
D
P_mode
= Process derating factor
D
V_mode
= Voltage derating factor
D
T_mode
= Temperature derating factor
D
C_mode
= Cload derating factor (mode is either V
DD
or V
SS
)
Table 1-15.
Derating Equation (External 1.8V Interface)
Item
Mode
Equation
Range
1–8mA
12–24mA
Package Lead
D
L_vdd
0.1188
×
Lpg + 0.6931
0.0099
×
Lpg + 1.7822
0.2069
×
Lpg + 0.4598
0.0115
×
Lpg + 2.4138
1.0000
1.2574
1.8217
1.0000
1.2184
1.4483
1.5182
×
voltage + 3.8910
1.0561
×
voltage + 3.0594
0.9962
×
voltage + 2.9080
0.7663
×
voltage + 2.4943
0.00039
×
temp + 1.0000
0.00018
×
temp + 1.0054
0.0028
×
temp + 1.0000
0.0029
×
temp + 0.9958
0.0337
×
cload + 0.6634
0.0153
×
cload + 1.2129
0.0328
×
cload + 0.6724
0.0155
×
cload + 1.1896
0.0800
×
Lpg + 0.8000
0.0400
×
Lpg + 1.2000
0.1200
×
Lpg + 0.4000
0.0400
×
Lpg + 1.2000
1.0000
1.0800
1.3200
1.0000
1.0400
1.0800
0.8000
×
voltage + 2.4800
0.2667
×
voltage + 1.5200
0.2898
×
voltage + 1.5652
0.2898
×
voltage + 1.5652
0.00167
×
temp + 1.0000
0.00076
×
temp + 1.02273
0.0016
×
temp + 1.0000
0.00145
×
temp + 1.0036
0.0200
×
cload + 0.8000
0.0040
×
cload + 1.2800
0.0120
×
cload + 0.8800
0.0020
×
cload + 1.1800
3nH
≤
Lpg
≤
10nH
10nH
≤
Lpg
≤
15nH
3nH
≤
Lpg
≤
10nH
10nH
≤
Lpg
≤
15nH
best
typical
worst
best
typical
worst
1.65
≤
voltage
≤
1.8
1.8
≤
voltage
≤
1.95
1.65
≤
voltage
≤
1.8
1.8
≤
voltage
≤
1.95
40
≤
temp
≤
25
25
≤
temp
≤
80
40
≤
temp
≤
25
25
≤
temp
≤
80
10pF
≤
cload
≤
30pF
30pF
≤
cload
≤
50pF
10pF
≤
cload
≤
30pF
30pF
≤
cload
≤
50pF
D
L_vss
Process
D
P_vdd
D
P_vss
Voltage
D
V_vdd
D
V_vss
Temperature
D
T_vdd
D
T_vss
Cload
D
C_vdd
D
C_vss