FS6370-01G-XTD ON Semiconductor

FS6370 EEPROM Programmable 3-PLL Clock Generator IC 1.0 Features Just-in-time customization of clock frequencies via internal non-volatile 128-bit serial EEPROM 2 I C-bus serial interface Three on-chip PLLs with programmable reference and feedback dividers Four independently programmable muxes and post dividers Programmable power-down of all PLLs and output clock drivers Tristate outputs for board testing One PLL and two mux/post-divider combinations can be modified via SEL CD input 5 V to 3.3 V operation Accepts 5 MHz to 27 MHz crystal resonators 2.0 Description The FS6370 is a CMOS clock generator IC designed to minimize cost and component count in a variety of electronic systems. Three EEPROM-programmable phase-locked loops (PLLs) driving four programmable muxes and post dividers provide a high degree of flexibility. An internal EEPROM permits just-in-time factory programming of devices for end user requirements. Figure 1: Pin Configuration 2008 SCILLC. All rights reserved. Publication Order Number: May 2008 Rev. 3 FS6370/D FS6370 Figure 2: Block Diagram Table 1: Pin Descriptions Pin Type Name Description 1 P VSS Ground U 2 DI SEL CD Selects one of two programmed PLL C, Mux C/D and post divider C/D combinations U 3 DI PD/SCL Power-down input (run-mode) or serial interface clock input (program mode) 4 P VSS Ground 5 AI XIN Crystal oscillator feedback 6 AO XOUT Crystal oscillator drive U 7 DI O OE/SDA Output enable input (run mode) or serial interface data input/output (program mode) 8 P VDD Power supply (5 V to 3.3 V) U 9 DI MODE Selects either program mode (low) or run mode (high) 10 DO CLK D D clock output 11 P VSS Ground 12 DO CLK C C clock output 13 DO CLK B B clock output 14 P VDD Power supply (5 V to 3.3 V) 15 DO CLK A A clock output 16 P VDD Power supply (5 V to 3.3 V) U Key: AI = Analog Input AO = Analog Output DI = Digital Input DI = Input with Internal Pull-Up DI = Input with Internal Pull-Down DIO = Digital Input/Output DI-3 = Three- D Level Digital Input, DO = Digital Output P = Power/Ground = Active Low pin Rev. 3 Page 2 of 28 www.onsemi.com