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参数资料
| 型号： | ICS950104YFT |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 166 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封装： | 0.300 INCH, MO-118, SSOP-48 |
| 文件页数： | 12/19页 |
| 文件大小： | 222K |
| 代理商： | ICS950104YFT |
2
ICS950104
Advance Information
Third party brands and names are the property of their respective owners.
Pin Descriptions
Notes:
1:
Internal Pull-up Resistor of 120K to 3.3V on indicated inputs
2:
Bidirectional input/output pins, input logic levels are latched at internal power-on-reset. Use 10Kohm resistor
to program logic Hi to VDD or GND for logic low.
3:
Internal Pull-down resistor of 120K to GND on indicated inputs.
PIN NUMBER
PIN NAME
TYPE
DESCRIPTION
1
CPUCLKC0
OUT
"Complementary" clocks of differential pair CPU outputs. These clocks are 180°
out of phase with SDRAM clocks. These open drain outputs need an external
1.5V pull-up.
2
CPUCLKT0
OUT
"True" clocks of differential pair CPU outputs. These clocks are in phase with
SDRAM clocks. These open drain outputs need an external 1.5V pull-up.
3, 9, 18, 30, 37
VDD
PWR
Power supply pins, nominal 3.3V
4, 12, 17, 25, 31,
36, 46, 48
GND
PWR
Ground pins
5, 22
AVDD
PWR
Analog power supply for 3.3V
6
X1
IN
Crystal input,nominally 14.318MHz.
7
X2
OUT
Crystal output, nominally 14.318MHz.
FS0
2, 3
IN
Frequency select pin.
REF0
OUT
14.318 MHz reference clock.
FS1
2, 3
IN
Frequency select pin.
REF1
OUT
14.318 MHz reference clock.
11
REF2
OUT
14.318 MHz reference clock.
FS2
1, 3
IN
Frequency select pin.
PCICLK_F
OUT
Free running PCICLK not stoped by PCI_STOP#
21, 20, 19, 16, 15,
14
PCICLK(5:0)
OUT
PCI clock outputs.
MULTSEL
2, 3
IN
3.3V LVTTL input for selecting the current multiplier for CPU outputs.
24_48MHz
OUT
Selectable 48 or 24MHz output
FS3
2, 3
IN
Frequency select pin.
48MHz
OUT
48MHz output clock
26
SCLK
IN
Clock input of I
2C input, 5V tolerant input
PD#
1
IN
Asynchronous active low input pin used to power down the device into a low
power state. The internal clocks are disabled and the VCO and the crystal are
stopped. The latency of the power down will not be greater than 3ms. This pin
will be activiated when
VttPWRGD#
IN
This 3.3V LVTTL input is a level sensitive strobe used to determine when FS
and MULTISEL0 inputs are valid and are ready to be sampled (active low)
28
CPU_STOP#
1
IN
This asynchronous input halts CPU, SDRAM, and AGP clocks at logic "0" level
when driven low, the stop selection can be programmed through I
2C.
29
PCI_STOP#
1
IN
Stops all PCICLKsbesides the PCICLK_F clocks at logic 0 level,
when input low
32, 33, 34, 35, 38,
39, 40, 41
SDRAM ( 7:0 )
OUT
SDRAM clock outputs.
42
SDRAM_STOP#
1
IN
Stops all SDRAMs besides the SDRAM_F clocks at logic 0 level, when input
low
43
SDATA
IN
Data input for I
2C serial input, 5V tolerant input
44
VDDL
PWR
Power supply pins, nominal 2.5V
45
CPUCLK
OUT
2.5V CPU clock
47
I REF
OUT
This pin establishes the reference current for the CPUCLK pairs. This
pin requires a fixed precision resistor tied to ground in order to establish
the appropriate current.
23
27
10
8
13
24
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