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参数资料
| 型号： | ICS954204YGT |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | 400 MHz, PROC SPECIFIC CLOCK GENERATOR, PDSO56 |
| 封装： | 6.10 MM, 0.50 MM PITCH, MO-153, TSSOP-56 |
| 文件页数： | 10/16页 |
| 文件大小： | 199K |
| 代理商： | ICS954204YGT |
3
Integrated
Circuit
Systems, Inc.
ICS954204
0933D—03/16/05
Pin Description (Continued)
PIN # PIN NAME
Type
Pin Description
29
GND
PWR
Ground pin.
30
SRCCLKC5
OUT
Complement clock of differential SRC clock pair.
31
SRCCLKT5
OUT
True clock of differential SRC clock pair.
32
CLKREQB#*
IN
Output enable for PCI Express (SRC) outputs. SMBus selects which outputs
are controlled.
0 = enabled, 1 = tri-stated
33
CLKREQA#*
IN
Output enable for PCI Express (SRC) outputs. SMBus selects which outputs
are controlled.
0 = enabled, 1 = tri-stated
34
VDDSRC
PWR
Supply for SRC clocks, 3.3V nominal
35
CPUCLKC2_ITP/SRCCLKC7
OUT
Complementary clock of CPU_ITP/SRC differential pair CPU_ITP/SRC
output. These are current mode outputs. External resistors are required for
voltage bias. Selected by ITP_EN input.
36
CPUCLKT2_ITP/SRCCLKT7
OUT
True clock of CPU_ITP/SRC differential pair CPU_ITP/SRC output. These
are current mode outputs. External resistors are required for voltage bias.
Selected by ITP_EN input.
37
VDDA
PWR
3.3V power for the PLL core.
38
GNDA
PWR
Ground pin for the PLL core.
39
IREF
IN
This pin establishes the reference current for the differential current-mode
output pairs. This pin requires a fixed precision resistor tied to ground in
order to establish the appropriate current. 475 ohms is the standard value.
40
CPUCLKC1
OUT
Complementary clock of differential pair CPU outputs. These are current
mode outputs. External resistors are required for voltage bias.
41
CPUCLKT1
OUT
True clock of differential pair CPU outputs. These are current mode outputs.
External resistors are required for voltage bias.
42
VDDCPU
PWR
Supply for CPU clocks, 3.3V nominal
43
CPUCLKC0
OUT
Complementary clock of differential pair CPU outputs. These are current
mode outputs. External resistors are required for voltage bias.
44
CPUCLKT0
OUT
True clock of differential pair CPU outputs. These are current mode outputs.
External resistors are required for voltage bias.
45
GND
PWR
Ground pin.
46
SCLK
IN
Clock pin of SMBus circuitry, 5V tolerant.
47
SDATA
I/O
Data pin for SMBus circuitry, 5V tolerant.
48
VDDREF
PWR
Ref, XTAL power supply, nominal 3.3V
49
X2
OUT
Crystal output, Nominally 14.318MHz
50
X1
IN
Crystal input, Nominally 14.318MHz.
51
GND
PWR
Ground pin.
52
REFOUT
OUT
Reference Clock output
53
FSLC/TEST_SEL
IN
3.3V tolerant input for CPU frequency selection. Low voltage threshold
inputs, see input electrical characteristics for Vil_FS and Vih_FS values.
TEST_Sel: 3-level latched input to enable test mode.
Refer to Test Clarification Table
54
CPU_STOP#
IN
Stops all CPUCLK, except those set to be free running clocks
55
PCI/SRC_STOP#
IN
Stops all PCICLKs and SRCCLKs besides the free-running clocks at logic 0
level, when input low
56
PCICLK2
OUT
PCI clock output.
*Pins 32 and 33 have pull-ups.
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