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参数资料
| 型号： | IMIXF652AYB |
| 元件分类： | 时钟产生/分配 |
| 英文描述： | PROC SPECIFIC CLOCK GENERATOR, PDSO48 |
| 封装： | SSOP-48 |
| 文件页数： | 2/7页 |
| 文件大小： | 113K |
| 代理商： | IMIXF652AYB |
XF652
Enhanced Clock Generator for 2 DIMM Systems
Preliminary
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
Rev.1.3
5/6/97
MILPITAS, CA 95035. TEL: 408-263-6300. FAX 408-263-6571
Page 2 of 7
PIN DESCRIPTION
PIN No.
Pin Name
Power
I/O
TYPE
Description
4
OSCin
Vdd
I
OSC1
On-chip reference oscillator input pin. Requires either an
external parallel resonant crystal (nominally 14.318 MHz) or
externally generated reference signal
5
OSCout
Vdd4
O
OSC1
On chip reference oscillator output pin. Drives an external
parallel resonant crystal. When an externally generated
reference signal is used, this pin is left unconnected
18, 19, 6,
20
S(0:1),
FCT(0:1)
-
I
Internal
Pull-Up
Frequency select input pins. See page 1 for frequency selection.
42, 41, 39,
38
CPUCLK(1:4)
Vdd2
O
Type1
Clock outputs. CPU frequency table specified. Power is applied
by Vdd2 pin.
36, 35, 33,
32, 30, 29,
27, 26
SDRAM(1:8)
Vdd3
O
Type4
Synchronous Dynamic RAM clocks. These may be disabled (in
groups of 2) by programming (with a resistor) the lower
numbered clock to ground with a 20 K resistor. See output buffer
disable table.
43, 37, 31,
24, 17, 10.
3
GND
-
P
Ground pins for the device.
48, 25
Vdd
-
P
Power supply pins for analog circuit , Fixed clocks and core logic
46, 40
Vdd2
-
P
Power supply pins for 2.5V/3.3V CPU buffers.
34, 28
Vdd3
-
P
Power supply pins for 3.3V PCI and SDRAM buffers.
21, 15, 7
Vdd4
-
23
24MHz
Vdd4
O
Type3
Frequency output for super I/O
22
48MHZ
Vdd4
O
Type3
Frequency output for USB.
2, 1, 47
REF(1:3)
Vdd
O
Type4
Buffered output of on-chip 14.31818 Mhz reference oscillator.
9, 11, 12,
13, 14, 16
PCICLK(1:6)
Vdd
O
Type5
PCI clock outputs. See frequency table
8
PCICLK_F
Vdd
O
Type5
PCI clock outputs. See frequency table.
45
IOAPIC
Vdd2
O
Type2
- Buffered output of 14.3MHZ for multiprocessor support. It is
powered by Vdd2
44
PWR_DWN#
-
I
Internal
Pull-Up
Power down, turns off power to entire IC, including VCO.
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