
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