ICS9248BF-138LF IDT, Integrated Device Technology Inc, ICS9248BF-138LF Datasheet - Page 2

• Manufacturer Part Number: ICS9248BF-138LF
• Description: IC FREQ GENERATOR/BUFFER 48-SSOP
• Manufacturer: IDT, Integrated Device Technology Inc
• Type: Frequency Generatorr

Specifications of ICS9248BF-138LF

• Input: Crystal
• Output: Clock
• Frequency - Max: 200MHz
• Voltage - Supply: 3.135 V ~ 3.465 V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 48-SSOP
• Frequency-max: 200MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 9248BF-138LF

ICS9248-138
General Description
The ICS9248-138 is the single chip clock solution for designs using the 810/810E and Solano style chipset. It provides
all necessary clock signals for such a system.
Spread spectrum may be enabled through I
10dB. This simplifies EMI qualification without resorting to board design iterations or costly shielding. The ICS9248-138
employs a proprietary closed loop design, which tightly controls the percentage of spreading over process and
temperature variations.
Serial programming I
Pin Configuration
0342C—08/26/03
5, 6, 14, 21, 29, 34,
32, 33, 35, 36, 37,
20, 19, 17, 16, 15
2, 10, 11, 18, 25,
PIN NUMBER
39, 40, 41,
30, 38
9, 8, 7
44, 45
22
23
24
42
12
13
26
27
28
31
43
46
47
48
1
3
4
SEL24_48MHz#
CPUCLK [1:0]
PCICLK [6:2]
SDRAM [7:0]
24_48MHz
VDDLAPIC
PIN NAME
GNDLCPU
2
SDRAM_F
VDDLCPU
3V66 [2:0]
PCICLK0
PCICLK1
C interface allows changing functions, stop clock programming and frequency selection.
IOAPIC
SDATA
48MHz
48MHz
SCLK
REF0
GND
VDD
PD#
FS2
FS0
FS1
FS4
FS3
X1
X2
TYPE
PWR
PWR
PWR
PWR
PWR
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
IN
IN
IN
IN
IN
IN
IN
IN
IN
IN
2
C programming. Spread spectrum typically reduces system EMI by 8dB to
Logic inputs frequency select I/O/USB output,
When a "0" is latched, output frequency = 48MHz
When a "1" is latched, output frequency = 24MHz
14.318 MHz reference clock.
3.3V Power supply for SDRAM output buffers, PCI output buffers, reference
output buffers and 48MHz output
Crystal input,nominally 14.318MHz.
Crystal output, nominally 14.318MHz.
Ground pin for 3V outputs.
3.3V Clocks
Frequency select pin.
PCI clock output
Frequency select pin.
PCI clock output
PCI clock outputs.
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.
Clock input of I2C input, 5V tolerant input
Data input for I2C serial input, 5V tolerant input
Frequency select pin.
48MHz output clocks
Frequency select pin.
48MHz output clocks
Frequency select pin.
Free running SDRAM - used for feed back to chipset, should remain on always.
SDRAM clock outputs
Ground pin for the CPU clocks.
CPU clock outputs.
Power pin for the CPUCLKs. 2.5V
2.5V clock output
Power pin for the IOAPIC. 2.5V
24 or 48MHz output
2
DESCRIPTION