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ICS954201BGLF Datasheet(PDF) 3 Page - Integrated Device Technology |
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ICS954201BGLF Datasheet(HTML) 3 Page - Integrated Device Technology |
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3 / 16 page  3 ICS954201 0819H—02/17/06 Pin Description (Continued) PIN # PIN NAME TYPE 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 SRCCLKC6 OUT Complement clock of differential SRC clock pair. 33 SRCCLKT6 OUT True clock of differential SRC clock pair. 34 VDDSRC PWR Supply for SRC clocks, 3.3V nominal 35 CPUCLKC2_ITP/SRCCLKC7 OUT Complimentary 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 OUT 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 Complimentary 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 Complimentary 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 FS_C/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. |
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