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SY89425JCTR Datasheet(PDF) 1 Page - Micrel Semiconductor |
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SY89425JCTR Datasheet(HTML) 1 Page - Micrel Semiconductor |
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1 / 8 page  s Two independently-powered 622.08MHz clock sources one chip s Differential PECL outputs s TTL/CMOS compatible inputs s SONET compliant jitter performance ( ≤0.01UI) s Choice of three reference frequencies for each PLL s Only 395mW per PLL (typ) s Complies with Bellcore, CCITT and ANSI standards s Single +5 volt power supply s Fully compatible with industry standard 10KH I/O levels s Available in 28-pin PLCC package Rev.: E Amendment: /0 Issue Date: August, 1998 TYPICAL APPLICATION ClockWorks™ SY89425 FEATURES DESCRIPTION Micrel-Synergy's SY89425 Dual Phase Locked Loop (PLL) consists of two totally separate, SONET compliant 622.08MHz clock generators on one chip. The user may select to power both PLLs or PLL A only. Each PLL produces a low-jitter OC-12/STS-12 clock rate from an input reference clock of 38.88, 51.84, or 77.76MHz. When using both PLLs, it is not necessary that they share a common reference clock (e.g., PLL A may operate from an STS-1 reference of 51.84MHz, while PLL B operates from an OC-3/STS-3 reference of 77.76MHz). The SY89425 operates from a single +5 volt supply, and requires only a simple series RC loop filter for each PLL. Coupling Micrel-Synergy's advanced PLL technology with our proprietary ASSET™ bipolar process has produced a clock generator IC which exceeds applicable Bellcore and ANSI specifications, while setting a new standard for performance and flexibility. PIN CONFIGURATION DUAL SONET OC-12 CLOCK SYNTHESIZER 26 27 28 1 2 3 4 18 17 16 15 14 13 12 25 24 23 22 21 20 19 5678 9 10 11 SEL78A CK622AP PLCC TOP VIEW CK622AN VCCOA GND VCCOB CK622BN CK622BP SEL39A RFCKA VCCA RFCKB SEL39B SEL78B 0.1uF GND AGND FLTRAN RFCKA (TTL) SEL39A (TTL) SEL78A (TTL) RSTA (TTL) 500 Ω CK622AP (PECL) CK622AN 622.08MHz PLL A VCCA VCCOA +5V +5V FLTRAP PLL B (SAME AS PLL A) 2X 50 Ω +3V GND CLOCK IN 1 |
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