Introduction
1.10 VDD/VSS Rules And Guidelines
Samsung ASIC
1-39
STDL130
where,
NVDDO
each_sso
= Number of VDD1O_LP (VDD2O_LP, 3O_LP) pad required for each SSO group,
NVSSO
each_sso
= Number of VSS1O_LP (VSS2O_LP, 3O_LP) pad required for each SSO group,
NBvdd = Number of buffers per VDD1O_LP (VDD2O_LP, 3O_LP) power pad with 1nH lead inductance
(Refer to Table 1-18),
NBvss = Number of buffers per VSS1O_LP (VSS2O_LP, 3O_LP) 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
0.3214
×
Lpg + 0.3571
0.1964
×
Lpg + 1.6071
0.0095
×
Lpg + 1.7143
0.0381
×
Lpg + 1.4286
1.0000
1.2857
2.8125
1.0000
1.3333
3.0476
2.0833
×
voltage + 4.9464
1.3095
×
voltage + 3.5536
2.8571
×
voltage + 6.3619
1.4603
×
voltage + 3.8476
0.00071
×
temp + 1.0000
0.00032
×
temp + 1.0097
0.0053
×
temp + 1.0000
0.0052
×
temp + 1.0035
0.0379
×
cload + 0.6205
0.0183
×
cload + 1.2098
0.0438
×
cload + 0.5619
0.0109
×
cload + 1.5476
0.0435
×
Lpg + 1.3043
0.0435
×
Lpg + 1.3043
0.0400
×
Lpg + 1.2000
0.0400
×
Lpg + 1.2000
1.0000
1.1667
1.4167
1.0000
1.0400
1.2400
1.1594
×
voltage + 3.2174
0.8696
×
voltage + 2.6957
0.2067
×
voltage + 1.5200
0.2067
×
voltage + 1.5200
0.0035
×
temp + 1.0000
0.0008
×
temp + 1.0672
0.0016
×
temp + 1.0000
0.0022
×
temp + 0.9855
0.0261
×
cload + 0.7391
0.0043
×
cload + 1.3913
0.0100
×
cload + 0.9000
0.0020
×
cload + 1.1400
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