ICS951901AFLFT IDT, Integrated Device Technology Inc, ICS951901AFLFT Datasheet - Page 7

• Manufacturer Part Number: ICS951901AFLFT
• Description: IC FREQ GENERATOR/BUFFER 48-SSOP
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Frequency Generatorr

Specifications of ICS951901AFLFT

• Input: Crystal
• Output: Clock
• Frequency - Max: 150MHz
• Voltage - Supply: 3.135 V ~ 3.465 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-SSOP
• Frequency-max: 150MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 951901AFLFT

Byte 17: Output Rise/Fall Time Select Register
Byte 19: Output Rise/Fall Time Select Register
VCO Programming Constrains
VCO Frequency ...................... 150MHz to 500MHz
VCO Divider Range ................ 8 to 519
REF Divider Range ................. 2 to 129
Phase Detector Stability .......... 0.3536 to 1.4142
Useful Formula
VCO Frequency = 14.31818 x VCO/REF divider value
Phase Detector Stabiliy = 14.038 x (VCO divider value)
To program the VCO frequency for over-clocking.
0. Before trying to program our clock manually, consider using ICS provided software utilities for easy
1. Select the frequency you want to over-clock from with the desire gear ratio (i.e. CPU:SDRAM:3V66:PCI ratio) by
2. Write 0001, 1001 (19
3. Read back byte 11-20 and copy values in these registers.
4. Re-initialize the write sequence.
5. Write a '1' to byte 9 bit 7 and write to byte 11 & 12 with the desired VCO & REF divider values.
6. Write to byte 13 to 20 with the values you copy from step 3. This maintains the output spread, skew and slew
7. The above procedure is only needed when changing the VCO for the 1st pass. If VCO frequency needed to be
0670B—07/15/04
changed again, user only needs to write to byte 11 and 12 unless the system is to reboot.
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
programming.
writing to byte 0, or using initial hardware power up frequency.
rate.
B
B
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
7
6
5
4
3
2
1
0
6
4
2
0
7
5
3
1
P
P
W
W
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
D
D
C
C
P
P
8 4
2
R
R
S
C
C
_ 4
D
P
P
E
E
M
( I
_ I
U
U
F
F
R
8 4
: 1
: 0
C
C
H
A
F
: 3
M
L
L
: z
M
H
S
S
S
) 0
K
K
) to byte 8 for readback of 21 bytes (byte 0-20).
H
e l
e l
e l
S
(
2
1
S
w
: z
e l
w
w
1 1
e l
S
S
w
S
R
0 :
R
R
e l
e l
D
w
D
e l
a
a
a
R
w
w
: )
s e
s e
e t
e t
e t
R
w
a
S
r c
r c
R
a r
a
e t
C
C
C
R
e l
e t
p i
a
p i
e t
n o
n o
n o
C
a
e t
w
i t
C
i t
e t
n o
C
n o
r t
r t
r t
n o
C
R
n o
n o
C
l o
l o
l o
r t
n o
a
r t
n o
e t
l o
r t
l o
r t
l o
r t
C
l o
l o
n o
r t
l o
-0.5
7
Byte 18: Output Rise/Fall Time Select Register
Byte 20: Output Rise/Fall Time Select Register
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
B
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
t i
6
4
2
0
7
5
3
1
7
6
5
4
3
2
0
1
P
P
W
W
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
D
D
S
A
A
P
R
R
R
R
R
R
C
D
C
G
G
e
e
e
e
e
e
P
e s
e s
e s
e s
e s
e s
C I
R
U
P
P
A
C
C
v r
v r
v r
v r
v r
v r
C
L
M
L
L
L
d e
d e
d e
d e
d e
d e
K
K
K
K
1
: 4
: 1
: 0
0
: 2
S
S
S
S
S
e l
D
e l
D
e l
e l
e l
w
w
s e
s e
w
w
w
ICS951901
r c
R
r c
R
R
R
R
a
p i
p i
a
a
a
e t
a
e t
e t
e t
i t
i t
e t
n o
C
n o
C
C
C
C
n o
n o
n o
n o
n o
r t
r t
r t
r t
r t
l o
l o
l o
l o
l o