MK1491-09FTR

MK1491-09FTR Features

DATASHEET

MK1491-09FTR Description

MK1491-09FTR Pin Descriptions

PinNumberPinNamePinTypePin Description1, 7, 11, 15, 21, 22GND23XIXO4, 8, 12, 19, 25, 28VDD5, 6, 91013141617LPC orLCLKSel66/33#66MPD#18, 20, 23, 24PCICLK2627RefCLK1RefCLK0/Spread#PIOPOIConnect to Ground.Crystal connection. Connect to a 14.31818 MHz crystal or input clock.Crystal connection. Connect to a 14.31818 MHz crystal or leaveunconnected.Connect to 3.3 V.33 MHz low skew clock outputs for LPC interface. These clocks aresynchronous outputs with low skew.When high, the PCICLK runs at 66 MHz; when low, the PCICLK runs at33 MHz. This pin has a weak internal pull-up resistor. This is an activeinput, not a latched input.48MO48 MHz clock output.48M/TS#I/O 48 MHz clock output. TS# is a latched input at power up and tristates alloutputs when low upon power up. When high upon power up, alloutputs are enabled. Power must be cycled for a change of state to bedetected. This pin has a weak internal pull-up resistor.OIOO66 MHz clock output.Power-down input. This is an active input not latched input. When thispin is set low, all clock outputs will be stopped, all PLL’s will be stopped,and the oscillator will be powered off. Weak pull-up resistor (see PowerDown table).33 to 66 MHz PCI synchronous clock outputs with low skew.Buffered reference output of 14.31818 MHz.I/O Buffered reference output of 14.31818 MHz. Spread# is a latched inputupon power up. Spread is applied to all clocks except REFCLK’s and48 MHz. Power must be cycled for a change of state to be detected.This pin has a weak internal pull-up resistor. See spread table.KEY: I = Input, TI = Tri-level, O = Output, P = Power supply connection, (T)I/O = Input on power up, becomes anOutput after 10 ms, Weak internal pull-up resistors are present on TS#, Spread#, PD#, and Sel66/33.