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ST49C107A Datasheet(PDF) 1 Page - Exar Corporation |
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ST49C107A Datasheet(HTML) 1 Page - Exar Corporation |
1 / 8 page ST49C107A-04 ...the analog plus companyTM Preprogrammed CPU Mother Board Frequency Generator Preliminary Rev. P2.00 E1996 EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z FAX (510) 668-7017 1 June 1997-3 FEATURES D Provides Reference Clock And Synthesized Clock D 5 to 32 MHz Input Reference Frequency D Pin-to-Pin Compatible to Avasem AV9107 D Programmable Analog Phase Locked Loop D Low Power Single 5V CMOS Technology D Up to 16 Frequencies Stored Internally D 8/14 pin DIP or SOIC Package GENERAL DESCRIPTION The ST49C107A-04 is a mask programmable monolithic analog CMOS device designed to generate two simultaneous clocks. The output frequency can vary from 2 to 130MHz, with up to 16 single selectable preprogrammed frequencies stored in internal ROM. The ST49C107A-04 is designed to replace existing CPU mother board clocks generated from individual oscillators in order to reduce board space and number of oscillators. To provide high speed and low jitter clock, the parts utilize a high speed analog CMOS phase locked loop using 14.318 MHz system clock as the reference clock (note that reference clock can be changed to generate optional frequencies from a standard programmed device). The programmed clock outputs are selectable via four address lines. ORDERING INFORMATION Part No. Package Operating Temperature Range ST49C107ACF14-04 14 Lead 150 Mil JEDEC SOIC 0 °C to 70°C BLOCK DIAGRAM Oscillator Circuit Programmable Counter B Phase Detector Charge Pump Loop Filter Voltage Controlled Oscillator Programmable Counter C Voltage Reference Circuit Programmable Counter A Output Buffer 1X-CLOCK XTAL XTAL B=5....128 A=5....128 C = 1, 2, 4 Rom Table Select Logic A0-A3 OE1 OE2 2X-CLOCK Figure 1. Block Diagram |
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