參數(shù)資料
型號(hào): 932S421CGLFT
廠商: INTEGRATED DEVICE TECHNOLOGY INC
元件分類: 時(shí)鐘產(chǎn)生/分配
英文描述: 400 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO56
封裝: 6.10 MM, 0.50 MM PITCH, ROHS COMPLIANT, MO-153, TSSOP-56
文件頁(yè)數(shù): 11/23頁(yè)
文件大?。?/td> 242K
代理商: 932S421CGLFT
19
Integrated
Circuit
Systems, Inc.
ICS932S421C
1460E—08/25/09
PD is an asynchronous active high input used to shut off all clocks cleanly prior to system power down.
When PD is asserted, all clocks will be driven low before turning off the VCO. All clocks will start without glitches when PD is
de-asserted.
PD, Power Down
D
PU
P
C#
U
P
CC
R
S#
C
R
SI
C
P
/
F
I
C
PB
S
UF
E
Re
t
o
N
0l
a
m
r
o
Nl
a
m
r
o
Nl
a
m
r
o
Nl
a
m
r
o
Nz
H
M
3
3z
H
M
8
4z
H
M
8
1
3
.
4
11
1r
o
2
*
f
e
r
I
t
a
o
l
F
t
a
o
l
F2
*
f
e
r
I
t
a
o
l
F
r
o
t
a
o
l
Fw
o
Lw
o
Lw
o
L1
Notes:
1. Refer to SMBus Byte 4 for additional information.
PD should be sampled high by 2 consecutive CPU# rising edges before stopping clocks. All single ended clocks will be held
low on their next high to low transition.
All differential clocks will be held high on the next high to low transition of the complimentary clock. If the control register
determining to drive mode is set to 'tri-state', the differential pair will be stopped in tri-state mode, undriven.
When the drive mode corresponding to the CPU or SRC clock of interest is set to '0' the true clock will be driven high at 2 x
Iref and the complementary clock will be tristated. If the control register is programmed to '1' both clocks will be tristated.
See SMBus Bytes 4 and 5 for additional information.
PD Assertion
PD
CPU, 133MHz
CPU#, 133MHz
SRC, 100MHz
SRC#, 100MHz
USB, 48MHz
PCI, 33MHz
REF, 14.31818
REF Drive Strength Functionality
Byte6,
bit 4
Byte
10, bit 1
Byte 10,
bit 0
REF1
REF0
0
XX1x
1x
10
0
1x
10
1
1x
2x
11
0
2x
1x
11
1
2x
CPU, SRC and PCI Divider Ratios
Div(3:0)
Divider
00000
2
10001
3
20010
5
30011
15
40100
4
50101
6
60110
10
70111
30
81000
8
91001
12
10
1010
20
11
1011
60
12
1100
16
13
1101
24
14
1110
40
15
1111
120
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