SM8702AM Datasheet | Nippon Precision Circuits Inc

OVERVIEW The SM8702AM is a clock generator IC that can generate clock signals up to and exceeding 100MHz for personal puter (PC) motherboards. It uses a single 14.318MHz crystal oscillator element and 2 built-in PLLs to simultaneously and independently generate 2 CPU clocks, 6 PCI bus clocks, 2 reference clocks with the same frequency as the crystal element, 48MHz USB interface clock, and 24MHz Super I/O chip clock outputs. It also has 14 outputs that can function as SDRAM clocks by buffering an external input SDRAM clock. FEATURES s PINOUT pre lim ina s s s s s s s s s s s s Intel® Pentium® II, Pentium® III, and AMD x86patibles supported 2.5/3.3V CPU clock outputs and IOAPIC clock output 14 × SDRAM clock outputs (3 DIMMs) 2 × CPU clock outputs (60), 66, 75, 83, 95, 100, 103, 112, (124), 133MHz CPU/SDRAM clock frequencies. Values in parentheses are available as mask options. 6 × PCI bus clock outputs (one free-running output) 33MHz or 1/2, 1/3, 1/4 of the CPU clock frequency 2 × reference clock outputs and 1 × IOAPIC clock output 14.318MHz REF/IOAPIC clock frequency 1 × 48MHz USB interface clock output 1 × 24MHz clock output for Super I/O chip I2C serial data bus for frequency/mode output control CPU-stop and PCI-stop functions Spread Spectrum Clock Generator (SSCG) outputs Center spread/Down spread, ± 0.5% or ± 1.5% 3.3V (VDD) and 2.5/3.3V (VDDL) supply voltages 48-pin SSOP package (pin patible with ICS9148-26) 48-pin SSOP (300 mil) (Top view) VDD1 REF0 VSS XT XTN VDD2 PCICLK_F/MODE PCICLK0 VSS PCICLK1 PCICLK2 PCICLK3 PCICLK4 VDD2 BUFFERIN VSS SDRAM11/CPU_STOP# SDRAM10/PCI_STOP# VDD3 SDRAM9 SDRAM8 VSS SDATA SCLK ORDERING INFORMATION D e vice P ackag e 48-pin SSOP APPLICATIONS s PC motherboards using Intel® Pentium®, Pentium® II/III, AMD-K6 devices, and x86 architecture CPUs Intel® and Pentium® are registered trademarks of Intel co.. AMD and AMD-K6 are registered trademarks of Advanced Micro Devices, Inc.. I2C Bus is a registered trademark of...