PDF MK1493-01 Data sheet ( Hoja de datos )

Número de pieza	MK1493-01
Descripción	PCI Clock Generator
Fabricantes	Integrated Circuit Systems
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No Preview Available ! MK1493-01 PCI Clock Generator Description The MK1493-01 is a general purpose clock generator part that provides an integrated clocking solution for PCI /networking applications. It provides 8 individually programmable PCI clocks, 2 CPU clocks, additional fixed PCI clocks and a 25 MHz reference clock for LAN support. This part incorporates ICS’s newest clock technology, offering more robust features and functionality. Using a serially programmable SMBus interface, the MK1493-01 can select the output clock frequency, and enabling/disabling each individual output clock. Features • 8 PCI clocks at 25, 33, 50, 66.66 MHz individually pin selectableand serioal port slectable • 2 CPU clocks at 100 MHz • 2 PCI clocks at 66.66 MHz • 1 PCI clock @ 50 MHz • 25 MHz reference clock • SMBus Programming • Power-up default frequency can be selected through FS inputs • 25 MHz crystal or clock input required • PCICLK cycle to cycle jitter <250ps • CPUCLK cycle to cycle jitter <100ps • Packaged in 48-pin (240mil) TSSOP Package • Operating Voltage 3.3V + - 5% Block Diagram SCLK SDATA FS(0:7)_A 8 FS(0:7)_B 8 VDD 7 PLL Divider Buffer Circuits SMBus Programmable X1/CLK 25 MHz X2 Clock Buffer/ Crystal Ocsillator 7 GND 8 PCICLK(0:7) Each PCI Output Clock Individually 2 Programmable CPUCLK(100MHz) 2 66M CLK 50M CLK REFCLK MDS 1493-01 B 1 Revision 021204 Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com 1 page MK1493-01 PCI Clock Generator How to Read: • Controller (host) will send a start bit • Controller (host) sends the write address D2 (H) • ICS clock will acknowledge • Controller (host) sends the beginning byte location = N • ICS clock will acknowldege • Controller (host) will send a separate start bit • Controller (host) sends the read address D3 (H) • ICS clock will acknowldege • ICS clock will send the data byte count = X • ICS clock sends Byte N+X-1 • ICS clock sends Byte 0 through Byte X (if X(H) was written to Byte 8) • Controller (host) will need to acknowledge each byte • Controller (host) will send a not acknowledge bit • Controller (host) will send a stop bit SMBus Table 2: Read-Back Register Index Block Read Operation Controller (Host) ICS (Slave/Receiver) T starT bit Slave Address D2 (H) WR WRite ACK Beginning Byte = N ACK RT Repeat starT Slave Address D3 (H) RD ReaD ACK ACK ACK O O O N Not P stoP bit Data Byte Count=X Beginning Byte N O O O Byte N + X - 1 Byte 0 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 Pin # - - - - - - - - Name FS vs. SMBus prog Control Function RESERVED HW/SW select RESERVED RESERVED RESERVED Frequency Selection Type RW 01 HW SW See Frequency table 3 PWD 0 0 0 0 0 0 0 0 MDS 1493-01 B 5 Revision 021204 Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com 5 Page MK1493-01 PCI Clock Generator Parameter Symbol Conditions Min. Typ. Max. Units Output Low Voltage Output High Current VOL IOL = 12 mA, Note 1 IOH VOH@MIN = 2.0 V, Note 1 0.3 0.4 V -19 mA Output Low Current IOL VOH@MAX = 0.8 V Note 1 19 mA Rise Time Fall Time Duty Cycle Output to Output Skew (CLK66A0, A1) tr1 VOL = 0.4V, VOH = 2.4 V, Note 1 tf1 VOH = 2.4 V, VOL = 0.4 V, Note 1 VT = 1.5 V VT = 1.5 V 1.2 1.7 ns 1.2 1.7 ns 45 50 55 % 175 ps Cycle to Cycle Jitter VT = 1.5 V Note 1: Guaranteed by design, not 100% tested in production Electrical Characteristics - PCICLK 250 ps Unless stated otherwise, VDD = 3.3 V+-5%, CL=30 pf, Ambient Temperature 0 to +70° C Parameter Symbol Conditions Min. Typ. Max. Units Output Frequency Output Impedance FO1 RDSP FS0 VO = VDD*(0.5) Note 1 25 MHz 12 55 Ω Output High Voltage Output Low Voltage Output High Current VOH VOL IOH IOH = -1 mA, Note 1 IOL = 1 mA, Note 1 VOH@MIN = 2.0 V, Note 1 2.4 -33 V 0.55 V mA Output Low Current IOL VOL@MAX = 0.8 V Note 1 30 mA Rise Time Fall Time Duty Cycle Output to Output Skew Cycle to Cycle Jitter tr1 VOL = 0.4 V, VOH = 2.4 V, Note 1 tf1 VOH = 2.4 V, VOL = 0.4 V, Note 1 VT = 1.5 V VT = 1.5 V VT = 1.5 V 1.7 2.4 ns 1.7 2.4 ns 45 50 55 % 250 ps 250 ps Note 1: Guaranteed by design, not 100% tested in production MDS 1493-01 B 11 Revision 021204 Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com 11 Page

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