Integrated Circuit Systems, Inc. ICS9148-17 Frequency Generator & Integrated Buffers for PENTIUM/ProTM General Description Features The ICS9148-17 generates all clocks required for high speed RISC or CISC microprocessor systems such as Intel PentiumPro or Cyrix. Eight different reference frequency multiplying factors are externally selectable with smooth frequency transitions. Features include four CPU, six PCI, two AGP (=2xPCI) and Twelve SDRAM clocks. Two reference outputs are available equal to the crystal frequency. One 48 MHz for USB, and one 24 MHz clock for Super IO. Built in 1.5%, 0.6% center or down spread spectrum modulation to reduce EMI. Serial programming I2C interface allows changing functions, stop clock programing and frequency selection. Additionally, the device meets the Pentium power-up stabilization, which requires that CPU and PCI clocks be stable within 2ms after power-up. 3.3V outputs: SDRAM, AGP, PCI, REF, 48/24 MHz 2.5V or 3.3V outputs: CPU 20 ohm CPU clock output impedance 20 ohm PCI clock output impedance CPU to PCI skew = 2 to 6ns No external load cap for CL=18pF crystals 250 ps max CPU, PCI clock skew Smooth CPU frequency transition among all CPU frequencies. I2C interface for programming 2ms power up clock stable time Clock duty cycle 45-55%. 48 pin 300 mil SSOP package 3.3V operation, 5V tolerant inputs. Pin Configuration High drive PCICLK and SDRAM outputs typically provide greater than 1 V/ns slew rate into 30pF loads. CPUCLK outputs typically provide better than 1V/ns slew rate into 20pF loads while maintaining 505% duty cycle. The REF and 24 and 48 MHz clock outputs typically provide better than 0.5V/ns slew rates. Block Diagram PLL2 48MHz 24MHz /2 X1 X2 XTAL OSC REF (0:1) STOP PLL1 Spread Spectrum STOP 2 4 AGP(0:1) CPUCLK (0:3) CPU_STOP FS(0:2) MODE CPU3.3#_2.5 3 12 LATCH 5 POR Control CPU_STOP# PCI_STOP# SDATA SCLK Logic Config. Reg. PCI CLOCK DIVDER STOP PCI_STOP 5 SDRAM (0:11) 48-Pin SSOP * Internal Pull-up Resistor of 240K to 3.3V on indicated inputs PCICLK (0:4) Power Groups PCICLK_F VDD1 = REF (0:1), X1, X2 VDD2 = PCICLK_F, PCICLK(0:5) VDD3 = SDRAM (0:11), supply for PLL core, 24 MHz, 48MHz VDD4 = AGP (0:1) VDDL = CPUCLK (0:3) Pentium is a trademark of Intel Corporation I2C is a trademark of Philips Corporation 9148-17 Rev G 4/27/00 ICS reserves the right to make changes in the device data identified in this publication without further notice. ICS advises its customers to obtain the latest version of all device data to verify that any information being relied upon by the customer is current and accurate. ICS9148-17 Pin Descriptions PIN NUMBER 1 2 P I N NA M E VDD1 REF0 C P U 3 . 3 # _ 2 . 5 1,2 3,9,16,22,27, 33,39,45 GND TYPE PWR OUT IN PWR DESCRIPTION Ref (0:2), XTAL power supply, nominal 3.3V 14.318 MHz reference clock. Indicates whether VDDL is 3.3V or 2.5V. High=2.5V CPU, LOW=3.3V C P U 1. L a t c h e d i n p u t . Ground. 4 X1 IN 5 X2 OUT VDD2 PWR Crystal input, has internal load cap (33pF) and feedback resistor from X2. Crystal output, nominally 14.318MHz. Has internal load cap (33pF). Supply for PCICLK_F and PCICLK (0:4), nominal 3.3V PCICLK_F OUT Free running PCI clock 6,14 7 8 10, 11, 12, 13 15, 47 FS11, 2 PCICLK0 1, 2 FS2 IN OUT IN Frequency select pin. Latched input PCI clock output. Frequency select pin. Latched input PCICLK (1:4) OUT PCI clock outputs. AGP (0:1) OUT SDRAM 11 OUT PCI_STOP#1 IN SDRAM 10 OUT Advanced Graphic Port outputs, powered by VDD4. Halts CPUCLK (0:3) clocks and AGP (0:1) clocks at logic 0 level, when input low (in Mobile Mode, MODE=0) SDRAM clock output Halts PCICLK (0:5) clocks at logic 0 level, when input low (in mobile mode, MODE=0) SDRAM clock output SDRAM (0:9) OUT SDRAM clock outputs. 19,30,36 VDD3 PWR 23 SDATA IN Supply for SDRAM (0:11), Core, 24MHz and 48MHz clocks, nominal 3.3V. Data input for I2C serial input. 24 SCLK IN Clock input of I2C input 24MHz OUT 17 18 20, 21,28, 29, 31, 32, 34, 35,37,38 25 26 40, 41, 43, 44 CPU_STOP#1 MODE1, 2 48MHz 1, 2 FS0 IN IN OUT IN 24MHz output clock. Pin 17, 18 function select pin, 1=Desktop Mode, 0=Mobile Mode. Latched input. 48MHz output clock Frequency select pin. Latched input CPUCLK (0:3) OUT CPU clock outputs, powered by VDDL. 42 VDDL PWR Supply for CPU (0:3), either 2.5V or 3.3V nominal 46 REF1 OUT 14.318MHz reference clock. 48 VDD4 PWR Supply for AGP (0:1) Notes: 1: Internal Pull-up Resistor of 240K to 3.3V on indicated inputs 2: Bidirectional input/output pins, input logic levels are latched at internal power-on-reset. Use 10Kohm resistor to program logic Hi to VDD or GND for logic low. 2 ICS9148-17 Mode Pin - Power Management Input Control MODE, Pin 25 (Latched Input) 0 1 Pin 17 Pin 18 CPU_STOP# (INPUT) SDRAM 11 (OUTPUT) PCI_STOP# (INPUT) SDRAM 10 (OUTPUT) Power Management Functionality PCICLK (0:5) PCICLK_F, REF, 24/48MHz and SDRAM Crystal OSC VCO CPU_STOP# PCI_STOP# AGP, CPUCLK Outputs 0 1 Stopped Low Running Running Running Running 1 1 Running Running Running Running Running 1 0 Running Stopped Low Running Running Running CPU 3.3#_2.5V Buffer selector for CPUCLK drivers. CPU3.3#_2.5 Input level (Latched Data) 1 0 Buffer Selected for operation at: 2.5V VDD 3.3V VDD Functionality VDD1, 2, 3, 4 = 3.3V5%, VDDL = 2.5V 5% or 3.3 5%, TA= 0 to 70C Crystal (X1, X2) = 14.31818MHz FS2 FS1 FS0 1 1 1 1 0 0 0 0 1 1 0 0 1 1 0 0 1 0 1 0 1 0 1 0 CPU, SDRAM (MHz) 100.2 90 83.3 75 75 68.5 66.8 60 PCI (MHz) 33.4 30 32 32 37.5 34.25 33.4 30 AG P (MHz) 66.8 60 64 64 75 68.5 66.8 60 3 R E F, I OA P I C (MHz) 14.318 14.318 14.318 14.318 14.318 14.318 14.318 14.318 ICS9148-17 General I2C serial interface information The information in this section assumes familiarity with I2C programming. For more information, contact ICS for an I2C programming application note. How to Write: How to Read: 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 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) ICS (Slave/Receiver) How to Read: Controller (Host) Start Bit Address D3(H) ACK Dummy Command Code ACK ICS (Slave/Receiver) ACK Byte Count Dummy Byte Count ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK ACK Stop Bit Byte 0 Byte 0 Byte 1 Byte 1 Byte 2 Byte 2 Byte 3 Byte 3 Byte 4 Byte 4 Byte 5 Byte 5 Stop Bit Notes: 1. 2. 3. 4. 5. 6. 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. 4 ICS9148-17 Serial Configuration Command Bitmap Byte0: Functionality and Frequency Select Register (default = 0) Bit Bit 7 Description 0 - 1.5% Spread Spectrum Modulation 1 - 0.6% Spread Spectrum Modulation Bit 6,5,4 CPU Clock PCI PWD 0 AGP 111 100.2 33.4 66.8 110 90 30 60 Bit 101 83.3 32 64 6:4 100 75 32 64 011 75 37.5 75 010 68.5 34.25 68.5 001 66.8 33.4 66.8 000 60 30 60 0 - Frequency is selected by hardware select, Bit 3 Latched Inputs 1 - Frequency is selected by Bit 6:4 (above) m center spread type. Bit 2 10 -- SSpprreeaadd SSppeeccttrruum down spread type. 0 N o r m a l Bit 1 1 - Spread Spectrum Enabled Bit 0 10- -TRriusntantienagll outputs Note 1 0,0,0 Note 1. Default at Power-up will be for latched logic inputs to define frequency. Bits 4, 5, 6 are default to 000, and if bit 3 is written to a 1 to use bits 6:4, then these should be defined to desired frequency at same write cycle. Note: PWD = Power-Up Default 0 I2C is a trademark of Philips Corporation 0 0 0 5 ICS9148-17 Byte 1: CPU, Active/Inactive Register (1 = enable, 0 = disable) Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Pin # 40 41 43 44 PWD 0 1 1 1 1 1 1 1 Byte 2: PCI Active/Inactive Register (1 = enable, 0 = disable) Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Description Version bit (Reserved) (Reserved) (Reserved) CPUCLK3 (Act/Inact) CPUCLK2 (Act/Inact) CPUCLK1 (Act/Inact) CPUCLK0 (Act/Inact) Pin # 28 29 31 32 34 35 37 38 PWD 1 1 1 1 1 1 1 1 PWD 1 1 1 1 1 1 1 Description Latched FS1# PCICLK_F (Act/Inact) AGP0 (Act/Inact) PCICLK4 (Act/Inact) PCICLK3 (Act/Inact) PCICLK2 (Act/Inact) PCICLK1 (Act/Inact) PCICLK0(Act/Inact) Byte 4: SDRAM Active/Inactive Register (1 = enable, 0 = disable) Byte 3: SDRAM Active/Inactive Register (1 = enable, 0 = disable) Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Pin # 7 15 14 12 11 10 8 Description SDRAM7 (Act/Inact) SDRAM6 (Act/Inact) SDRAM5 (Act/Inact) SDRAM4 (Act/Inact) SDRAM3 (Act/Inact) SDRAM2 (Act/Inact) SDRAM1 (Act/Inact) SDRAM0 (Act/Inact) Bit Bit 7 Bit 6 Bit 5 Bit 4 Pin # - PWD 1 1 1 Bit 3 17 1 Bit 2 18 1 Bit 1 Bit 0 20 21 1 1 Description Latched FS0# (Reserved) (Reserved) (Reserved) SDRAM11 (Act/Inact) (Desktop Mode Only) SDRAM10 (Act/Inact) (Desktop Mode Only) SDRAM9 (Act/Inact) SDRAM8 (Act/Inact) Byte 5: Peripheral Active/Inactive Register (1 = enable, 0 = disable) Bit Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Pin # 47 46 2 PWD 1 1 1 1 1 1 1 Description Latched FS2# (Reserved) (Reserved) AGP1(Act/Inact) (Reserved) (Reserved) REF1 (Act/Inact) REF0 (Act/Inact) Notes: 1. Inactive means outputs are held LOW and are disabled from switching. 2. Latched Frequency selects will be Inverted logic level of the input frequency select pin conditions. 6 ICS9148-17 CPU_STOP# Timing Diagram CPU_STOP# is an asychronous input to the clock synthesizer. It is used to turn off the CPU clocks for low power operation. CPU_STOP# is synchronized by the ICS9148-17. The minimum that the CPU clock is enabled (CPU_STOP# high pulse) is 100 CPU clocks. All other clocks will continue to run while the CPU clocks are disabled. The CPU clocks will always be stopped in a low state and start in such a manner that guarantees the high pulse width is a full pulse. CPU clock on latency is less than 4 CPU clocks and CPU clock off latency is less than 4 CPU clocks. Notes: 1. All timing is referenced to the internal CPU clock. 2. CPU_STOP# is an asynchronous input and metastable conditions may exist. This signal is synchronized to the CPU clocks inside the ICS9148-17. 3. All other clocks except CPU and AGP clocks continue to run undisturbed. 7 ICS9148-17 PCI_STOP# Timing Diagram PCI_STOP# is an asynchronous input to the ICS9148-17. It is used to turn off the PCICLK (0:5) clocks for low power operation. PCI_STOP# is synchronized by the ICS9148-17 internally. The minimum that the PCICLK (0:5) clocks are enabled (PCI_STOP# high pulse) is at least 10 PCICLK (0:5) clocks. PCICLK (0:5) clocks are stopped in a low state and started with a full high pulse width guaranteed. PCICLK (0:5) clock on latency cycles are only one rising PCICLK clock off latency is one PCICLK clock. CPUCLK (Internal) PCICLK (Internal) PCICLK (Free-running) CPU_STOP# (High) PCI_STOP# PCICLK (External) Notes: 1. All timing is referenced to the Internal CPUCLK (defined as inside the ICS9148 device.) 2. PCI_STOP# is an asynchronous input, and metastable conditions may exist. This signal is required to be synchronized inside the ICS9148. 3. All other clocks continue to run undisturbed. 8 ICS9148-17 Shared Pin Operation Input/Output Pins 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. The I/O pins designated by (input/output) on the ICS9148-17 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. Via to VDD Programming Header 2K W Via to Gnd Device Pad 8.2K W Clock trace to load Series Term. Res. Fig. 1 9 ICS9148-17 Absolute Maximum Ratings Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ambient Operating Temperature . . . . . . . . . . . . Storage Temperature . . . . . . . . . . . . . . . . . . . . . . 7.0 V GND 0.5 V to VDD +0.5 V 0C to +70C 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. Electrical Characteristics - Input/Supply/Common Output Parameters TA = 0 - 70C; Supply Voltage VDD = VDDL = 3.3 V +/-5% (unless otherwise stated) PARAMETER Input High Voltage Input Low Voltage Input High Current Input Low Current Input Low Current Operating Supply Current Input frequency Input Capacitance1 SYMBOL VIH VIL IIH IIL1 IIL2 IDD3.3OP Transition Time1 1 Settling Time Clk Stabilization 1 Skew 1 1 CONDITIONS VIN = VDD VIN = 0 V; Inputs with no pull-up resistors VIN = 0 V; Inputs with pull-up resistors CL = 0 pF; 66.8 MHz Fi VDD = 3.3 V; CIN CINX Logic Inputs X1 & X2 pins Ttrans To 1st crossing of target Freq. MIN 2 VSS-0.3 -5 -200 TYP 0.1 2.0 -100 100 MAX VDD+0.3 0.8 5 160 14.318 27 Ts From 1st crossing to 1% target Freq. TSTAB From VDD = 3.3 V to 1% target Freq. TCPU-SDRAM1 VT = 1.5 V; SDRAM Leads TCPU-PCI1 VT = 1.5 V; CPU Leads 36 UNITS V V A A A mA MHz 5 45 pF pF 2 ms ms -500 2 200 5 2 ms 500 6 ps ns Guaranteed by design, not 100% tested in production. 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 Operating Supply Current Skew1 1 SYMBOL IDD2.5OP CONDITIONS CL = 0 pF; 66.8 MHz MIN TYP 10 MAX 20 UNITS mA TCPU-SDRAM2 VT = 1.5 V; VTL = 1.25 V; SDRAM Leads TCPU-PCI2 VT = 1.5 V; VTL = 1.25 V; CPU Leads -500 2 200 5 500 6 ps ns Guaranteed by design, not 100% tested in production. 10 ICS9148-17 Electrical Characteristics - CPU TA = 0 - 70C; VDD = VDDL = 3.3 V +/-5%; C L = 10 - 20 pF (unless otherwise stated) PARAMETER Output High Voltage Output Low Voltage Output High Current Output Low Current SYMBOL VOH2A VOL2A IOH2A IOL2A Rise Time tr2A1 tf2A1 d t2A1 tsk2A1 t j1s2A1 tjabs2A1 Fall Time Duty Cycle Skew Jitter, One Sigma Jitter, Absolute 1 CONDITIONS IOH = -28 mA IOL = 27 mA VOH = 2.0 V VOL = 0.8 V MIN 2.5 TYP 2.6 0.35 -29 37 MAX 1.75 2 ns 1.1 2 ns 50 55 % VT = 1.5 V 50 250 ps VT = 1.5 V VT = 1.5 V 65 150 ps 165 250 ps 33 VOL = 0.4 V, VOH = 2.4 V VOH = 2.4 V, VOL = 0.4 V VT = 1.5 V 45 -250 0.4 -23 UNITS V V mA mA Guaranteed by design, not 100% tested in production. Electrical Characteristics - CPU TA = 0 - 70C; VDD = 3.3 V +/-5%, VDDL = 2.5V +/-5%; CL = 10 - 20 pF (unless otherwise stated) PARAMETER SYMBOL CONDITIONS Output High Voltage VOH2B IOH = -8 mA Output Low Voltage VOL2B IOL = 12 mA Output High Current IOH2B VOH = 1.7 V Output Low Current IOL2B VOL = 0.7 V tr2B1 Rise Time VOL = 0.4 V, VOH = 2.0 V 2 19 TYP 2.2 0.3 -20 26 MAX 1.5 1.8 ns 1.6 1.8 ns 0.4 -16 UNITS V V mA mA Fall Time tf2B Duty Cycle dt2B1 VT = 1.25 V 47 55 % Skew Jitter, Single Edge Displacement2 Jitter, One Sigma tsk2B1 VT = 1.25 V 60 250 ps tjsed2B 1 VT = 1.25 V tj1s2B1 VT = 1.25 V tjabs2B 1 VT = 1.25 V 200 250 ps 65 150 ps 160 300 ps Jitter, Absolute 1 1 MIN 2 VOH = 2.0 V, VOL = 0.4 V 40 -300 Guaranteed by design, not 100% tested in production. Edge displacement of a period relative to a 10-clock-cycle rolling average period. 11 ICS9148-17 Electrical Characteristics - PCI TA = 0 - 70C; VDD = VDDL = 3.3 V +/-10%; CL = 30 pF (unless otherwise stated) PARAMETER Output High Voltage Output Low Voltage Output High Current Output Low Current SYMBOL VOH1 VOL1 IOH1 IOL1 Rise Time tr1 1 Fall Time Duty Cycle VOL = 0.4 V, VOH = 2.4 V 1.8 2 ns 1 VOH = 2.4 V, VOL = 0.4 V 1.6 2 ns 1 VT = 1.5 V 51 55 % 1 VT = 1.5 V 130 250 ps tj1s1a tj1s1b VT = 1.5 V, synchronous VT = 1.5 V, asynchronous 40 200 150 250 ps ps tab s1a tjabs1b VT = 1.5 V, synchronous VT = 1.5 V, asynchronous 135 500 250 650 ps ps tsk1 Jitter, One Sigma 1 MAX d t1 Skew Jitter, Absolute TYP 3 0.2 -60 50 tf1 1 1 CONDITIONS IOH = -28 mA IOL = 23 mA VOH = 2.0 V VOL = 0.8 V MIN 2.4 41 45 -250 -650 UNITS V V mA mA 0.4 -40 Guaranteed by design, not 100% tested in production. Electrical Characteristics - SDRAM TA = 0 - 70C; VDD = VDDL = 3.3 V +/-5%; CL = 30 pF PARAMETER SYMBOL CONDITIONS IOH = -28 mA Output High Voltage VOH1 IOL = 23 mA Output Low Voltage VOL1 VOH = 2.0 V Output High Current IOH1 VOL = 0.8 V Output Low Current IOL1 Rise Time1 Tr1 VOL = 0.4 V, VOH = 2.4 V Fall Time1 Tf1 VOH = 2.4 V, VOL = 0.4 V Duty Cycle1 1 Skew 1 Dt1 VT = 1.5 V MIN 2.4 41 45 Tsk1 VT = 1.5 V Jitter, One Sigma1 Tj1s1 VT = 1.5 V Jitter, Absolute1 Jitter, Absolute1 Tjabs1 Tjabs1 VT = 1.5 V (with synchronous PCI) VT = 1.5 V (with asynchronous PCI) TYP 3 0.2 -60 50 12 0.4 -40 UNITS V V mA mA 1.75 2 ns 1.5 2 ns 50 55 % 200 500 ps 50 Guaranteed by design, not 100% tested in production. MAX 150 ps -250 +250 ps -400 400 ps ICS9148-17 Electrical Characteristics - AGP TA = 0 - 70C; VDD = VDDL = 3.3 V +/-10%; C L = 30 pF (unless otherwise stated) PARAMETER Output High Voltage Output Low Voltage Output High Current Output Low Current SYMBOL VOH1 VOL1 IOH1 IOL1 Rise Time tr1 1 Fall Time Duty Cycle 1 TYP 3 0.2 -60 50 MAX VOL = 0.4 V, VOH = 2.4 V 1.1 2 ns 1 VOH = 2.4 V, VOL = 0.4 V 1 2 ns 1 VT = 1.4 V 49 55 % 1 VT = 1.5 V 130 250 ps tj1s1 VT = 1.5 V 2 3 % 2.5 4.5 5 6 % % TYP 2.6 0.3 -32 25 MAX UNITS V V mA mA tf1 d t1 Skew Jitter, One Sigma1 tsk1 Jitter, Absolute1 tabs1a tjabs1b CONDITIONS IOH = -28 mA IOL = 23 mA VOH = 2.0 V VOL = 0.8 V MIN 2.4 41 45 VT = 1.5 V, synchronous VT = 1.5 V, asynchronous -5 -6 0.4 -40 UNITS V V mA mA Guaranteed by design, not 100% tested in production. Electrical Characteristics - 24MHz, 48MHz, REF0 TA = 0 - 70C; VDD = VDDL = 3.3 V +/-10%; C L = 10 -20 pF (unless otherwise stated) PARAMETER Output High Voltage Output Low Voltage Output High Current Output Low Current Rise Time Fall Time CONDITIONS IOH = -16 mA IOL = 9 mA VOH = 2.0 V VOL = 0.8 V MIN 2.4 16 0.4 -22 tr5 1 VOL = 0.4 V, VOH = 2.4 V 2 4 ns tf5 1 VOH = 2.4 V, VOL = 0.4 V 1.9 4 ns 1 VT = 1.5 V 54 57 % 1 3 % - 5 % Duty Cycle d t5 Jitter, One Sigma tj1s5 1 tjabs5 1 Jitter, Absolute 1 SYMBOL VOH5 VOL5 IOH5 IOL5 45 VT = 1.5 V VT = 1.5 V -5 Guaranteed by design, not 100% tested in production. 13 ICS9148-17 General Layout Precautions: 1) Use a ground plane on the top layer of the PCB in all areas not used by traces. 2) Make all power traces and vias as wide as possible to lower inductance. Notes: 1 All clock outputs should have series terminating resistor. Not shown in all places to improve readibility of diagram 2 Optional EMI capacitor should be used on all CPU, SDRAM, and PCI outputs. 3 Optional crystal load capacitors are recommended. Capacitor Values: C1, C2 : Crystal load values determined by user C3 : 100pF ceramic All unmarked capacitors are 0.01F ceramic 14 ICS9148-17 Ordering Information ICS9148yF-17-T 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 15 ICS reserves the right to make changes in the device data identified in this publication without further notice. ICS advises its customers to obtain the latest version of all device data to verify that any information being relied upon by the customer is current and accurate.