ICS9248AG-92 IDT, Integrated Device Technology Inc, ICS9248AG-92 Datasheet

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ICS9248AG-92

Manufacturer Part Number
ICS9248AG-92
Description
Manufacturer
IDT, Integrated Device Technology Inc
Type
PLL Clock Generatorr
Datasheet

Specifications of ICS9248AG-92

Number Of Elements
2
Supply Current
180mA
Pll Input Freq (min)
14.318MHz
Operating Supply Voltage (typ)
3.3V
Operating Temp Range
0C to 70C
Package Type
TSSOP
Output Frequency Range
24 to 100MHz
Operating Supply Voltage (min)
3.135V
Operating Supply Voltage (max)
3.465V
Operating Temperature Classification
Commercial
Pin Count
48
Lead Free Status / Rohs Status
Not Compliant

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Mobile Pentium II
Recommended Application:
The ICS9248-92 is a fully compliant timing solution for the
Intel mobile 440BX/MX chipset requirements.
General Description:
Features include two strong CPU, seven PCI and eight SDRAM
clocks. Three reference outputs are available equal to the
crystal frequency. Stronger drive CPUCLK outputs typically
provide greater than 1 V/ns slew rate into 20pF loads. This
device meets rise and fall requirements with 2 loads per CPU
output (ie, one clock to CPU and NB chipset, one clock to two
L2 cache inputs).
PWR_DWN# pin allows low power mode by stopping crystal
OSC and PLL stages. For optional power management,
CPU_STOP# can stop CPU (0:1) clocks and PCI_STOP# will
stop PCICLK (0:5) clocks.
PCICLK outputs typically provide better than 1V/ns slew rate
into 30pF loads while maintaining 50±5% duty cycle. The REF
clock outputs typically provide better than 0.5V/ns slew rates.
The ICS9248-92 accepts a 14.318MHz reference crystal or
clock as its input and runs on a 3.3V core supply.
Block Diagram
IDT
TM
Mobile Pentium II
TM
System Clock Chip
TM
System Clock Chip
1
Features:
• Generates system clocks for CPU, SDRAM, PCI, plus
14.318 MHz REF(0:2), USB, Plus Super I/O
• I2C serial configuration interface provides output clock
disabling and other functions
• MODE input pin selects optional power management
input control pins
• Two fixed outputs separately selectable as 24 or 48MHz
• 2.5V outputs: CPU
• 3.3V outputs: SDRAM, PCI, REF, 48/24 MHz
• No power supply sequence requirements
• Uses external 14.318MHz crystal
• 48 pin 240 mil TSSOP package
• Output enable register for serial port control: 1 = enable
0 = disable
Pin Configuration
Functionality
ICS9248-92
DATASHEET
309—01/25/10

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ICS9248AG-92 Summary of contents

Page 1

TM Mobile Pentium II Recommended Application: The ICS9248- fully compliant timing solution for the Intel mobile 440BX/MX chipset requirements. General Description: Features include two strong CPU, seven PCI and eight SDRAM clocks. Three reference outputs are available equal ...

Page 2

ICS9248-92 Mobile Pentium II TM System Clock Chip Pin Description Power Groups VDDCOR = Supply for PLL core VDDREF = REF [0:2], X1, X2 VDDPCI = PCICLK_F, PCICLK [0:5] VDDSDR = SDRAM [0:7] VDD48 = 48/24MHzA, 48/24MHz VDDLCPU = CPUCLK ...

Page 3

ICS9248-92 Mobile Pentium II TM System Clock Chip Power On Conditions Example MODE = 1, pins 26 and 27 are configured as SDRAM7 and SDRAM6 respectively MODE = 0, pins 26 and 27 are configured as ...

Page 4

ICS9248-92 Mobile Pentium II TM System Clock Chip General I The information in this section assumes familiarity with I For more information, contact IDT for an I How to Write: • Controller (host) sends a start bit. • Controller (host) ...

Page 5

ICS9248-92 Mobile Pentium II TM System Clock Chip Serial Configuration Command Bitmaps Byte 0: Functional and Frequency Select Clock Register (default on Bits Note: PWD = Power-Up Default Select Functions Notes: 1. ...

Page 6

ICS9248-92 Mobile Pentium II TM System Clock Chip TM TM IDT Mobile Pentium II System Clock Chip 6 309—01/25/10 ...

Page 7

ICS9248-92 Mobile Pentium II TM System Clock Chip Power Management Clock Enable Configuration Full clock cycle timing is guaranteed at all times after the system has initially powered up except where noted. During power up and power down operations using ...

Page 8

ICS9248-92 Mobile Pentium II TM System Clock Chip CPU_STOP# Timing Diagram CPUSTOP asychronous input to the clock synthesizer used to turn off the CPUCLKs for low power operation. CPU_STOP# is synchronized by the ICS9248-92. The minimum ...

Page 9

ICS9248-92 Mobile Pentium II TM System Clock Chip PCI_STOP# Timing Diagram PCI_STOP asynchronous input to the ICS9248-92 used to turn off the PCICLK (0:5) clocks for low power operation. PCI_STOP# is synchronized by the ICS9248-92 internally. ...

Page 10

ICS9248-92 Mobile Pentium II TM System Clock Chip PD# Timing Diagram The power down selection is used to put the part into a very low power state without turning off the power to the part. PD asynchronous active ...

Page 11

ICS9248-92 Mobile Pentium II TM System Clock Chip IDT TM Mobile Pentium II TM System Clock Chip 11 309—01/25/10 ...

Page 12

ICS9248-92 Mobile Pentium II TM System Clock Chip IDT TM Mobile Pentium II TM System Clock Chip 12 309—01/25/10 ...

Page 13

ICS9248-92 Mobile Pentium II TM System Clock Chip IDT TM Mobile Pentium II TM System Clock Chip 13 309—01/25/10 ...

Page 14

ICS9248-92 Mobile Pentium II TM System Clock Chip General Layout Precautions: 1) Use a ground plane on the top routing layer of the PCB in all areas not used by traces. 2) Make all power traces and ground traces as ...

Page 15

ICS9248-92 Mobile Pentium II TM System Clock Chip INDEX INDEX AREA AREA aaa Ordering Information 9248yG-92GLFT Example: XXXX IDT Mobile Pentium ...

Page 16

ICS9248-92 Mobile Pentium II TM System Clock Chip Innovate with IDT and accelerate your future networks. Contact: www.IDT.com For Sales 800-345-7015 408-284-8200 Fax: 408-284-2775 Corporate Headquarters Integrated Device Technology, Inc. 6024 Silver Creek Valley Road San Jose, CA 95138 United ...

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