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MK1491-09 Datasheet(PDF) 2 Page - Integrated Circuit Systems |
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MK1491-09 Datasheet(HTML) 2 Page - Integrated Circuit Systems |
2 / 8 page AMD Geode™ GX2 Clock Source MDS 1491-09 G 2 Revision 080204 Integrated Circuit Systems, Inc. ● 525 Race Street, San Jose, CA 95126 ● tel (408) 297-1201 ● www.icst.com MK1491-09 Pin Assignment PCI Frequency Select Table EMI Control Spread direction is DOWN. Pin Descriptions KEY: I = Input, TI = Tri-level, O = Output, P = Power supply connection, (T)I/O = Input on power up, becomes an Output after 10 ms, Weak internal pull-up resistors are present on TS#, Spread#, PD#, and Sel66/33. 18 7 17 8 16 9 15 GND 10 VDD 11 LCLK2/33M 12 GND 13 Sel66/33# 14 GND VDD PCICLK0/33-66M VDD PD# GND 48M 66M 22 21 20 19 48M/TS# GND 5 6 LCLK0/33M LCLK1/33M 24 23 3 4 XO VDD VDD 26 25 RefCLK1 1 2 GND XI RefCLK0/Spread# 28 27 VDD PCICLK1/33-66M PCICLK2/33-66M PCICLK3/33-66M Sel66/33# PCI Frequency 033 MHz 166 MHz Spread# PCI Low EMI 0ON 1OFF Pin Number Pin Name Pin Type Pin Description 1, 7, 11, 15, 21, 22 GND P Connect to Ground. 2 XI I Crystal connection. Connect to a 14.31818 MHz crystal or input clock. 3 XO O Crystal connection. Connect to a 14.31818 MHz crystal, or leave unconnected. 4, 8, 12, 19, 25, 28 VDD P Connect to 3.3 V. 5, 6, 9 LCLK O 33 MHz low skew clock outputs. 10 Sel66/33# I Selects frequency on PCICLK. 13 48M O 48 MHz clock output. 14 48M/TS# I/O 48 MHz clock output. TS# is high at power-up. 16 66M O 66 MHz clock output. 17 PD# I Power-down input (see table on page 3). 18, 20, 23, 24 PCICLK O 33 to 66 MHz PCI synchronous clock outputs with low skew. 26 RefCLK1 O Buffered reference output of 14.31818 MHz. 27 RefCLK0/ Spread# I/O Buffered reference output of 14.31818 MHz. Spread select at power-up. For Spread#, see table above. |
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