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Integrated Circuit Systems, Inc.
ICS9248-138
Preliminary Product Preview
Frequency Generator & Integrated Buffers for Celeron & PII/IIITM
Recommended Application: 810/810E and Solano type chipset. Output Features: * 2- CPUs @ 2.5V * 9 - SDRAM @ 3.3V, including 1 free running * 7 - PCICLK @ 3.3V * 1 - IOAPIC @ 2.5V, * 3 - 3V66MHz @ 3.3V * 2 - 48MHz, @ 3.3V fixed. * 1 - 24/48MHz, @3.3V selectable by I2C * 1 - REF @v3.3V, 14.318MHz. Features: * Up to 200MHz frequency support * Support FS0-FS4 strapping status bit for I2C read back. * Support power management: Through Power down Mode from I2C programming. * Spread spectrum for EMI control ( 0.25% center). * Uses external 14.318MHz crystal Skew Specifications: * CPU - CPU: <175ps * SDRAM - SDRAM: < 250ps * 3V66 - 3V66: <175ps * PCI - PCI: <500ps * For group skew specifications, please refer to group timing relationship.
Pin Configuration
1
*SEL24_48#/REF0 VDDREF X1 X2 GNDREF GND3V66 3V66-0 3V66-1 3V66-2 VDD3V66 VDDPCI 1 *FS0/PCICLK0 1 **FS1/PCICLK1 GNDPCI PCICLK2 PCICLK3 PCICLK4 VDDPCI PCICLK5 PCICLK6 GNDPCI PD# SCLK SDATA
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25
VDDLAPIC 1 IOAPIC VDDLCPU CPUCLK0 CPUCLK1 GNDLCPU GNDSDR SDRAM0 SDRAM1 SDRAM2 VDDSDR SDRAM3 SDRAM4 SDRAM5 GNDSDR SDRAM6 SDRAM7 SDRAM_F VDDSDR GND48 24_48MHz/FS2** 48MHz/FS3* 1 48MHz/FS4* VDD48
48-Pin 300mil SSOP
* These inputs have a 120K pull up to VDD. * * These inputs have a 120K pull down to GND. 1 These are double strength.
Functionality Block Diagram
PLL2 /2 X1 X2 XTAL OSC PLL1 Spread Spectrum
2
FS4 FS3 FS2 FS1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1
FS0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1
48MHz [1:0] 24_48MHz
REF0
CPU DIVDER
2
CPUCLK [1:0]
SDRAM DIVDER
8
SDRAM [7:0] SDRAM_F
SEL24_48# Control SDATA SCLK FS[4:0] PD# Config. Reg. Logic
IOAPIC DIVDER
IOAPIC
CPU (MHz) 66.67 66.87 68.67 71.34 100.00 100.30 103.00 107.00 133.33 133.73 137.33 120.00 133.33 133.73 137.33 120.00
SDRAM (MHz) 100.00 100.30 103.00 107.00 100.00 100.30 103.00 107.00 133.33 133.73 137.33 120.00 100.00 100.30 103.00 90.00
ICS9248-138
3V66 (MHz) 66.67 66.87 68.67 71.34 66.67 66.87 68.67 71.34 66.67 66.87 68.67 60.00 66.67 66.87 68.67 60.00
PCICLK (MHz) 33.33 33.43 34.33 35.66 33.33 33.43 34.33 35.66 33.33 33.43 34.33 30.00 33.33 33.43 34.33 30.00
I OA P I C (MHz) 16.67 16.72 17.16 17.83 16.67 16.72 17.17 17.84 16.67 16.72 17.17 15.00 16.67 16.72 17.17 15.00
PCI DIVDER
7
PCICLK [6:0]
3V66 DIVDER
3V66 [2:0]
3
1 1 1 1
1 1 1 1
0 1 0 1
1 0 1 1
0 1 1 0
160.00 160.00 166.67 166.67
160.00 120.00 166.67 125.00
80.00 80.00 83.34 83.34
40.00 40.00 41.67 41.67
20.00 20.00 20.84 20.84
Additional frequencies selectable through I2C programming.
9248- 138 Rev A 10/03/00 Third party brands and names are the property of their respective owners.
PRODUCT PREVIEW documents contain information on new products in the sampling or preproduction phase of development. Characteristic data and other specifications are subject to change without notice.
ICS9248-138
Preliminary Product Preview
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 I2C programming. Spread spectrum typically reduces system EMI by 8dB to 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 I2C interface allows changing functions, stop clock programming and frequency selection.
Pin Configuration
PIN NUMBER PIN NAME SEL24_48M Hz# REF0 2, 10, 11, 18, 25, 30, 38 3 4 5, 6, 14, 21, 29, 34, 42 9, 8, 7 12 13 20, 19, 17, 16, 15 VDD X1 X2 GND 3V66 [2:0] FS0 PCICLK0 FS1 PCICLK1 PCICLK [6:2] TYPE IN OUT PWR IN OUT PWR OUT IN OUT IN OUT OUT DESCRIPTION Logic inputs frequency select I/O/USB output, When a "0" is latched, output frequency = 48M Hz When a "1" is latched, output frequency = 24M Hz 14.318 M Hz reference clock. 3.3V Power supply for SDRAM output buffers, PCI output buffers, reference output buffers and 48M Hz output Crystal input,nominally 14.318M Hz. Crystal output, nominally 14.318M Hz. 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.
1
22 23 24
26 27 28 31 32, 33, 35, 36, 37, 39, 40, 41, 43 44, 45 46 47
PD# SCLK SDATA FS4 48M Hz FS3 48M Hz
IN IN IN IN OUT IN OUT IN
FS2 24_48M Hz
SDRAM _F SDRAM [7:0] GNDLCPU CPUCLK [1:0] VDDLCPU IOAPIC
OUT
OUT OUT PWR OUT PWR OUT
24 or 48M Hz output
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
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ICS9248-138
Preliminary Product Preview
Serial Configuration Command Bitmap
Byte0: Functionality and Frequency Select Register (default = 0)
Bit Description bit2 bit7 bit6 bit5 bit4 CPUCLK SDRAM 3V66 (MHz) (MHz) (MHz) FS4 FS3 FS2 FS1 FS0 0 0 0 0 0 66.67 100.00 66.67 0 0 0 0 1 66.87 100.30 66.87 0 0 0 1 0 68.67 103.00 68.67 0 0 0 1 1 71.34 107.00 71.34 0 0 1 0 0 100.00 100.00 66.67 0 0 1 0 1 100.30 100.30 66.87 0 0 1 1 0 103.00 103.00 68.67 0 0 1 1 1 107.00 107.00 71.34 0 1 0 0 0 133.33 133.33 66.67 0 1 0 0 1 133.73 133.73 66.87 0 1 0 1 0 137.33 137.33 68.67 0 1 0 1 1 120.00 120.00 60.00 0 1 1 0 0 133.33 100.00 66.67 0 1 1 0 1 133.73 100.30 66.87 0 1 1 1 0 137.33 103.00 68.67 0 1 1 1 1 120.00 90.00 60.00 1 0 0 0 0 136.00 136.00 68.00 1 0 0 0 1 140.00 140.00 70.00 1 0 0 1 0 142.67 142.67 71.34 1 0 0 1 1 145.33 145.33 72.67 1 0 1 0 0 136.00 102.00 68.00 1 0 1 0 1 140.00 105.00 70.00 1 0 1 1 0 142.67 107.00 71.34 1 0 1 1 1 145.33 109.00 72.67 1 1 0 0 0 146.67 146.67 73.34 1 1 0 0 1 153.33 153.33 76.67 1 1 0 1 0 160.00 160.00 80.00 1 1 0 1 1 166.67 166.67 83.34 1 1 1 0 0 146.67 110.00 73.34 1 1 1 0 1 160.00 120.00 80.00 1 1 1 1 0 166.67 125.00 83.34 1 1 1 1 1 200.00 200.00 66.67 0 - Frequency is selected by hardware select, Latched Inputs 1 - Frequency is selected by Bit 2, 6:4 0 - Normal 1 - Spread Spectrum Enabled 0.25% Center Spread 0 - Running 1- Tristate all outputs PWD PCICLK IOAPIC (MHz) (MH) 33.33 33.43 34.33 35.67 33.33 33.43 34.33 35.67 33.33 33.43 34.33 30.00 33.33 33.43 34.33 30.00 34.00 35.00 35.67 36.33 34.00 35.00 35.67 36.33 36.67 38.33 40.00 41.67 36.67 40.00 41.67 33.33 16.67 16.72 17.16 17.83 16.67 16.72 17.17 17.84 16.67 16.72 17.17 15.00 16.67 16.72 17.17 15.00 17.00 17.50 17.84 18.17 17.00 17.50 17.84 18.17 18.34 19.17 20.00 20.84 18.34 20.00 20.84 16.67 Spread Precentage 0 to -0.5% Down Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0 to -0.5% Down Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0 to -0.5% Down Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0 to -0.5% Down Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread 0.25% Center Spread
0,0000
Bit 2, 7:4
Bit 3 Bit 1 Bit 0
0 1 0
Note 1: Default at power-up will be for latched logic inputs to define frequency, as displayed by Bit 3.
I2C is a trademark of Philips Corporation
Third party brands and names are the property of their respective owners.
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ICS9248-138
Preliminary Product Preview
Byte 1: SDRAM Control Register (1= enable, 0 = disable)
Byte 2: PCI, Control Register (1= enable, 0 = disable)
BIT Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PIN# 31 32 33 35 36 37
PWD X X 1 1 1 1 1 1
DESCRIPTION FS2# FS1# SDRAM_F SDRAM7 SDRAM6 SDRAM5 SDRAM4 SDRAM3
BIT Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PIN# 20 19 17 16 15 13 12
PWD 1 1 1 1 1 1 1 1
DESCRIPTION FS0# PCICLK6 PCICLK5 PCICLK4 PCICLK3 PCICLK2 PCICLK1 PCICLK0
Byte 3: 3V66, Control Register (1= enable, 0 = disable)
Byte 4: Control Register (1= enable, 0 = disable)
BIT Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PIN# 7 8 9
PWD X 1 1 X 1 1 1 1
DESCRIPTION FS4# R e s e r ve d R e s e r ve d FS3# R e s e r ve d 3V66-0 3V66-1 3V66-2
BIT Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
PIN# 26 27 28
PWD 1 1 1 1 1 1 1 1
DESCRIPTION R e s e r ve d R e s e r ve d R e s e r ve d R e s e r ve d R e s e r ve d 48MHz-0 48MHz-1 24_48MHz
Byte 5: Control Register (1= enable, 0 = disable)
Byte 6: Control Register (1= enable, 0 = disable)
BIT Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
Notes:
PIN# 1 47 44 45 39 40 41
PWD X 1 1 1 1 1 1 1
DESCRIPTION SEL24_48# REF0 IOAPIC CPUCLK1 CPUCLK0 SDRAM2 SDRAM1 SDRAM0
BIT Bit7 Bit6 Bit5 Bit4 Bit3 Bit2 Bit1 Bit0
PIN# -
PWD 0 0 0 0 0 1 1 0
DESCRIPTION R e s e r ve d ( N o t e ) R e s e r ve d ( N o t e ) R e s e r ve d ( N o t e ) R e s e r ve d ( N o t e ) R e s e r ve d ( N o t e ) R e s e r ve d ( N o t e ) R e s e r ve d ( N o t e ) R e s e r ve d ( N o t e )
1. Inactive means outputs are held LOW and are disabled from switching. 2. Latched Frequency Selects (FS#) will be inferted logic load of the input frequency select pin conditions.
Note: Dont write into this register, writing into this register can cause malfunction
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ICS9248-138
Preliminary Product Preview
Absolute Maximum Ratings
Core Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . 5.5 V I/O Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . 3.6V Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND 0.5 V to VDD +0.5 V Ambient Operating Temperature . . . . . . . . . . . . . 0C to +70C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . 65C to +150C Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These ratings are stress specifications only and functional operation of the device at these or any other conditions above those listed in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect product reliability.
Group Timing Relationship Table
Group CPU 66MHz SDRAM 100MHz Offset CPU to SDRAM CPU to 3V66 SDRAM to 3V66 3V66 to PCI PCI to PCI USB & DOT 2.5ns 7.5ns 0.0ns 1.5-3.5ns 0.0ns Asynch Tolerance 500ps 500ps 500ps 500ps 1.0ns N/A CPU 100MHz SDRAM 100MHz Offset 5.0ns 5.0ns 0.0ns 1.5-3.5ns 0.0ns Asynch Tolerance 500ps 500ps 500ps 500ps 1.0ns N/A CPU 133MHz SDRAM 100MHz Offset 0.0ns 0.0ns 0.0ns 1.5-3.5ns 0.0ns Asynch Tolerance 500ps 500ps 500ps 500ps 1.0ns N/A CPU 133MHz SDRAM 133MHz Offset 3.75ns 0.0ns 3.75ns 1.5 -3.5ns 0.0ns Asynch Tolerance 500ps 500ps 500ps 500ps 1.0ns N/A
Electrical Characteristics - Input/Supply/Common Output Parameters
TA = 0 - 70C; Supply Voltage VDD = 3.3 V +5%, VDDL=2.5 V+ 5%(unless otherwise stated) PARAMETER Input High Voltage Input Low Voltage Input High Current Input Low Current Input Low Current Operating Supply Current Power Down Supply Current Input frequency Pin Inductance Input Capacitance1 SYMBOL VIH VIL IIH IIL1 IIL2 IDD3.3OP IDD3.3PD Fi Lpin CIN Cout CINX Ttrans Ts TSTAB tPZH,tPZH tPLZ,tPZH CONDITIONS MIN 2 VSS-0.3 -5 -5 -200 TYP MAX UNITS VDD+0.3 V 0.8 V A 5 A A 100 600 14.318 7 Logic Inputs Out put pin capacitance X1 & X2 pins To 1st crossing of target Freq. From 1st crossing to 1% target Freq. From VDD = 3.3 V to 1% target Freq. output enable delay (all outputs) output disable delay (all outputs) 1 1 5 6 45 3 3 3 10 10 mA A MHz nH pF pF pF mS mS mS nS nS
VIN = VDD VIN = 0 V; Inputs with no pull-up resistors VIN = 0 V; Inputs with pull-up resistors CL = 0 pF; Select @ 66M CL = 0 pF; With input address to Vdd or GND VDD = 3.3 V;
27
Transition Time Settling Time1
1
Clk Stabilization1 Delay
1
Guarenteed by design, not 100% tested in production.
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ICS9248-138
Preliminary Product Preview
Electrical Characteristics - CPU
TA = 0 - 70C, VDDL = 2.5 V +/-5%; CL = 10 - 20 pF (unless otherwise stated) PARAMETER Output Impedance Output Impedance Output High Voltage Output Low Voltage Output High Current Output Low Current Rise Time Fall Time Duty Cycle Skew Jitter
1
SYMBOL RDSP2B1 RDSN2B1 VOH2B VOL2B IOH2B IOL2B tr2B1 tf2B1 dt2B1 tsk2B1 tjcyc-cyc1 VO = VDD*(0.5)
CONDITIONS VO = VDD*(0.5) IOH = -1 mA IOL = 1 mA VOH @MIN= 1.0V , VOH@ MAX= 2.375V VOL @MIN= 1.2V , VOL@ MAX= 0.3V VOL = 0.4 V, VOH = 2.0 V VOH = 0.4 V, VOL = 2.0 V VT = 1.25 V VT = 1.25 V VT = 1.25 V
MIN 13.5 13.5 2 -27 27 0.4 0.4 45
TYP
MAX UNITS 45 45 0.4 -27 30 1.6 1.6 55 250 250 V V mA mA ns ns % ps ps
Guarenteed by design, not 100% tested in production.
Electrical Characteristics - 3V66
TA = 0 - 70C; VDD = 3.3 V +/-5%; CL = 10-30 pF (unless otherwise stated) PARAMETER Output Impedance Output Impedance Output High Voltage Output Low Voltage Output High Current Output Low Current Rise Time Fall Time Duty Cycle Skew Jitter
1
SYMBOL RDSP1 RDSN1 VOH1 VOL1 IOH1 IOL1 tr11 tf1
1 1 1 1 1
CONDITIONS VO = VDD*(0.5) VO = VDD*(0.5) IOH = -1 mA IOL = 1 mA VOH@ MIN = 1.0 V, VOH@ MAX = 3.135 V VOL@ MIN = 1.95 V, VOL@ MAX= 0.4 VOL = 0.4 V, VOH = 2.4 V VOH = 2.4 V, VOL = 0.4 V VT = 1.5 V VT = 1.5 V VT = 1.5 V
MIN 12 12 2.4 -33 30 0.5 0.5 45
TYP
MAX UNITS 55 55 0.55 -33 38 2 2 55 175 500 V V mA mA ns ns % ps ps
dt1
tsk1
tjcyc-cyc
Guarenteed by design, not 100% tested in production.
Third party brands and names are the property of their respective owners.
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ICS9248-138
Preliminary Product Preview
Electrical Characteristics - IOAPIC
TA = 0 - 70C;VDDL = 2.5 V +/-5%; CL = 10 - 20 pF (unless otherwise stated) PARAMETER SYMBOL CONDITIONS 1 Output Impedance RDSP4B VO = VDD*(0.5) Output Impedance RDSN4B1 VO = VDD*(0.5) Output High Voltage VOH4\B IOH = -5.5 mA Output Low Voltage VOL4B IOL = 9.0 mA Output High Current IOH4B VOH@ min = 1.0 V, VOH@ MAX = 2.375 V Output Low Current IOL4B VOL@ MIN = 1.2 V, VOL@ MAX= 0.3 V 1 Rise Time tr4B VOL = 0.4 V, VOH = 2.0 V Fall Time tf4B1 VOH = 2.0 V, VOL = 0.4 V 1 Duty Cycle dt4B VT = 1.25 V 1 Skew tsk4 tjcyc-cyc VT = 1.25 V Jitter
1
MIN 9 9 2 -27 27 0.4 0.4 45
TYP
MAX UNITS 30 30 V 0.4 V -27 mA 30 mA 1.6 ns 1.6 ns 55 % 250 ps 500 ps
Guarenteed by design, not 100% tested in production.
Electrical Characteristics - SDRAM
TA = 0 - 70C; VDD = VDDL = 3.3 V +/-5%; CL = 20 - 30 pF (unless otherwise stated) PARAMETER Output Impedance Output Impedance Output High Voltage Output Low Voltage Output High Current Output Low Current Rise Time Fall Time Duty Cycle Skew Jitter
1
SYMBOL RDSP3 RDSN3 VOH3 VOL3 IOH3 IOL3 Tr3 1 Tf3 Dt3
1 1 1 1 1
CONDITIONS VO = VDD*(0.5) VO = VDD*(0.5) IOH = -1 mA IOL = 1 mA VOH @MIN= 2.0 V, VOH@ MAX=3.135 V VOL@ MIN= 1.0 V, VOL@ MAX=0.4 V VOL = 0.4 V, VOH = 2.4 V VOH = 2.4 V, VOL = 0.4 V VT = 1.5 V VT = 1.5 V VT = 1.5 V
MIN 10 10 2.4 -54 54 0.4 0.4 45
TYP
MAX UNITS 24 24 0.4 -46 53 1.6 1.6 55 250 250 V V mA mA ns ns % ps ps
Tsk3 tj cyc-cyc
Guarenteed by design, not 100% tested in production.
Third party brands and names are the property of their respective owners.
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ICS9248-138
Preliminary Product Preview
Electrical Characteristics - PCI
TA = 0 - 70C; VDD = 3.3 V +/-5%; CL = 10-30 pF (unless otherwise stated) PARAMETER Output Impedance Output Impedance Output High Voltage Output Low Voltage Output High Current Output Low Current Rise Time Fall Time Duty Cycle Skew Jitter
1
SYMBOL RDSP1 RDSN1 VOH1 VOL1 IOH1 IOL1 tr11 tf1
1 1 1 1 1
CONDITIONS VO = VDD*(0.5)
MIN 12
TYP
MAX UNITS 55 55 0.55 -33 38 2 2 55 500 500 V V mA mA ns ns % ps ps
VO = VDD*(0.5) 12 IOH = -1 mA 2.4 IOL = 1 mA VOH@ MIN = 1.0 V, VOH@ MAX = 3.135 V -33 VOL@ MIN = 1.95 V, VOL@ MAX= 0.4 30 VOL = 0.4 V, VOH = 2.4 V VOH = 2.4 V, VOL = 0.4 V VT = 1.5 V VT = 1.5 V VT = 1.5 V 0.5 0.5 45
dt1
tsk1 tjcyc-cyc
Guarenteed by design, not 100% tested in production.
Electrical Characteristics - REF, 48MHz_0
TA = 0 - 70C; V DD = V DDL = 3.3 V +/-5%; CL = 10 -20 pF (unless otherwise stated) PARAMETER SYMBOL CONDITIONS MIN 1 Output Impedance RDSP5 V O = V DD *(0.5) 20 1 Output Impedance RDSN5 V O = V DD *(0.5) 20 Output High Voltage VOH5 IOH = 1 mA 2.4 IOL = -1 mA Output Low Voltage VOL5 V OH @MIN=1 V, VOH@MAX= 3.135 V -29 Output High Current IOH5 V OL@MIN=1.95 V, V OL@MIN =0.4 V 29 Output Low Current IOL5 1 V OL = 0.4 V, VOH = 2.4 V Rise Time tr5 1 Fall Time tf5 V OH = 2.4 V, V OL = 0.4 V Duty Cycle dt51 V T = 1.5 V 45 V T = 1.5 V Skew T sk tjcyc-cyc1 V T = 1.5 V; Fixed Clocks Jitter 1 tjcyc-cyc V T = 1.5 V; Ref Clocks
1
TYP
MAX 60 60 0.4 -23 27 4 4 55 250 500 1000
UNITS V V mA mA ns ns % ps ps ps
Guarenteed by design, not 100% tested in production.
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ICS9248-138
Preliminary Product Preview
The information in this section assumes familiarity with I2C programming. For more information, contact ICS for an I2C programming application note.
General I2C serial interface information
How to Write:
Controller (host) sends a start bit. Controller (host) sends the write address D2 (H) ICS clock will acknowledge Controller (host) sends a dummy command code ICS clock will acknowledge Controller (host) sends a dummy byte count ICS clock will acknowledge Controller (host) starts sending first byte (Byte 0) through byte 5 ICS clock will acknowledge each byte one at a time. Controller (host) sends a Stop bit
How to Read:
Controller (host) will send start bit. Controller (host) sends the read address D3 (H) ICS clock will acknowledge ICS clock will send the byte count Controller (host) acknowledges ICS clock sends first byte (Byte 0) through byte 5 Controller (host) will need to acknowledge each byte Controller (host) will send a stop bit
How to Write:
Controller (Host) Start Bit Address D2(H) Dummy Command Code ACK Dummy Byte Count ACK Byte 0 ACK Byte 1 ACK Byte 2 ACK Byte 3 ACK Byte 4 ACK Byte 5 ACK Stop Bit
ACK Stop Bit ACK Byte 5 ACK Byte 4 ACK Byte 3 ACK Byte 2 ACK Byte 1 ACK Byte 0
ICS (Slave/Receiver)
How to Read:
Controller (Host) Start Bit Address D3(H) ICS (Slave/Receiver)
ACK
ACK Byte Count
Notes:
1. 2. 3. 4. 5. The ICS clock generator is a slave/receiver, I2C component. It can read back the data stored in the latches for verification. Read-Back will support Intel PIIX4 "Block-Read" protocol. The data transfer rate supported by this clock generator is 100K bits/sec or less (standard mode) The input is operating at 3.3V logic levels. The data byte format is 8 bit bytes. To simplify the clock generator I2C interface, the protocol is set to use only "Block-Writes" from the controller. The bytes must be accessed in sequential order from lowest to highest byte with the ability to stop after any complete byte has been transferred. The Command code and Byte count shown above must be sent, but the data is ignored for those two bytes. The data is loaded until a Stop sequence is issued. At power-on, all registers are set to a default condition, as shown.
6.
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ICS9248-138
Preliminary Product Preview
Shared Pin Operation Input/Output Pins
The I/O pins designated by (input/output) on the ICS9248138 serve as dual signal functions to the device. During initial power-up, they act as input pins. The logic level (voltage) that is present on these pins at this time is read and stored into a 5-bit internal data latch. At the end of Power-On reset, (see AC characteristics for timing values), the device changes the mode of operations for these pins to an output function. In this mode the pins produce the specified buffered clocks to external loads. To program (load) the internal configuration register for these pins, a resistor is connected to either the VDD (logic 1) power supply or the GND (logic 0) voltage potential. A 10 Kilohm (10K) resistor is used to provide both the solid CMOS programming voltage needed during the power-up programming period and to provide an insignificant load on the output clock during the subsequent operating period. Figure 1 shows a means of implementing this function when a switch or 2 pin header is used. With no jumper is installed the pin will be pulled high. With the jumper in place the pin will be pulled low. If programmability is not necessary, than only a single resistor is necessary. The programming resistors should be located close to the series termination resistor to minimize the current loop area. It is more important to locate the series termination resistor close to the driver than the programming resistor.
Programming Header Via to Gnd Device Pad 2K W
Via to VDD
8.2K W Clock trace to load Series Term. Res.
Fig. 1
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ICS9248-138
Preliminary Product Preview
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# is an asynchronous active low input. This signal needs to be synchronized internal to the device prior to powering down the clock synthesizer. Internal clocks are not running after the device is put in power down. When PD# is active low all clocks need to be driven to a low value and held prior to turning off the VCOs and crystal. The power up latency needs to be less than 3 mS. The power down latency should be as short as possible but conforming to the sequence requirements shown below. The REF and 48MHz clocks are expected to be stopped in the LOW state as soon as possible. Due to the state of the internal logic, stopping and holding the REF clock outputs in the LOW state may require more than one clock cycle to complete.
PD#
CPUCLK 3V66 PCICLK VCO Crystal
Notes: 1. All timing is referenced to the Internal CPUCLK (defined as inside the ICS9248 device). 2. As shown, the outputs Stop Low on the next falling edge after PD# goes low. 3. PD# is an asynchronous input and metastable conditions may exist. This signal is synchronized inside this part. 4. The shaded sections on the VCO and the Crystal signals indicate an active clock. 5. Diagrams shown with respect to 133MHz. Similar operation when CPU is 100MHz.
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ICS9248-138
Preliminary Product Preview
SYMBOL
In Millimeters In Inches COMMON DIMENSIONS COMMON DIMENSIONS MIN MAX MIN MAX 2.413 0.203 0.203 2.794 0.406 0.343 .095 .008 .008 .110 .016 .0135
A A1 b c D E E1 e h L N VARIATIONS N 48 56
0.127 0.254 SEE VARIATIONS 10.033 7.391 0.381 10.668 7.595 0.635
.005 .010 SEE VARIATIONS .395 .291 .015 .420 .299 .025
0.635 BASIC 0.508 1.016 SEE VARIATIONS 0 8
0.025 BASIC .020 .040 SEE VARIATIONS 0 8
D mm. MIN 15.748 18.288 MAX 16.002 18.542 MIN .620 .720
D (inch) MAX .630 .730
6/1/00 REV B
JEDEC MO-118 DOC# 10-0034
Ordering Information
ICS9248yF-138
Example:
ICS XXXX y F - PPP - T
Designation for tape and reel packaging Pattern Number (2 or 3 digit number for parts with ROM code patterns) Package Type F=SSOP
Revision Designator (will not correlate with datasheet revision)
Device Type (consists of 3 or 4 digit numbers) Prefix ICS, AV = Standard Device
Third party brands and names are the property of their respective owners.
12
ADVANCE INFORMATION documents contain information on products in the formative or design phase development. Characteristic data and other specifications are design goals. ICS reserves the right to change or discontinue these products without notice.

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