FS6233-01
Motherboard Clock Generator IC
AMERICAN MICROSYSTEMS, INC.
September 2000
Table 6: Current Multiplier
Table 8: HOST Buffer Clock Outputs
ISEL_0
0
0
1
1
ISEL_1
0
1
0
1
MULTPLIER
IO = 5 × IREF
IO = 6 × IREF
IO = 4 × IREF
IO = 7 × IREF
Figure 2: Current Reference Circuit
VDD_I (3.3V)
2R
1.1V
R
Mirror
Current
Additional
Mirror
Current
ISEL_0:1
IREF
HOST_N
Reference
Current IREF
RIREF
RS
RP
HOST_P
RS
RP
Table 7: HOST Current Selection
PROGRAM
RESISTOR
RIREF
REFERENCE
CURRENT
IREF
CURRENT
MULTIPLIER
TRACE
IMPEDANCE
475Ω (1%) 2.32mA
IO = 5 × IREF
60Ω
50Ω
475Ω (1%) 2.32mA
IO = 6 × IREF
60Ω
50Ω
475Ω (1%) 2.32mA
IO = 4 × IREF
60Ω
50Ω
475Ω (1%) 2.32mA
IO = 7 × IREF
60Ω
50Ω
221Ω (1%)
5mA
IO = 5 × IREF
30Ω
25Ω
221Ω (1%)
5mA
IO = 6 × IREF
30Ω
25Ω
221Ω (1%)
5mA
IO = 4 × IREF
30Ω
25Ω
221Ω (1%)
5mA
IO = 7 × IREF
NOTE: Shaded row indicates the Primary System Configuration
30Ω
25Ω
OUTPUT
VOLTAGE
0.71V
0.59V
0.85V
0.71V
0.56V
0.47V
0.99V
0.82V
0.75V
0.62V
0.90V
0.75V
0.60V
0.50V
1.05V
0.84V
Output
Voltage (V)
3.30
3.14
2.97
2.81
2.64
2.48
2.31
2.14
1.98
1.81
1.65
1.48
1.32
1.15
0.99
0.82
0.66
0.49
0.33
0.16
0.00
HIGH DRIVE CURRENT (mA)
AT PRIMARY SYSTEM CONFIGURATION
MIN.
TYP.
MAX.
0.00
-3.03
-5.66
-7.87
-9.67
-11.05
-11.98
-12.52
-12.77
-12.91
-12.99
-13.04
-13.07
-13.08
-13.09
-13.11
-13.12
-13.13
-13.13
-13.14
-13.15
0.00
-4.22
-7.68
-10.30
-11.91
-12.56
-12.85
-13.07
-13.26
-13.42
-13.54
-13.64
-13.70
-13.73
-13.75
-13.76
-13.78
-13.79
-13.80
-13.81
-13.82
0.00
-5.76
-9.86
-11.85
-12.45
-12.84
-13.16
-13.45
-13.72
-13.96
-14.17
-14.36
-14.52
-14.64
-14.71
-14.74
-14.76
-14.78
-14.80
-14.82
-14.83
0
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
Output Voltage (V)
1
2
3
30Ω
50Ω
90Ω
Max VOH
Data in this table represents nominal characterization data only
ISO9001
4
9.18.00