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| SONET OC-12/OC-3 CLOCK SYNTHESIZER FEATURES s Single chip source for 622.08MHz and 155.52MHz clocks s 622.08MHz output is differential PECL, 155.52MHz output is single-ended PECL s TTL/CMOS compatible inputs and reference output s SONET compliant jitter performance (0.01UI) s Choice of three reference frequencies s Only 395mW (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 ClockWorksTM SY89426 DESCRIPTION Micrel-Synergy's SY89426 Multi-Output Phase Locked Loop (PLL) is a SONET compliant clock generator providing 622.08MHz, 155.52MHz and retimed reference clock outputs. The PLL produces low jitter OC-12/STS-12 and OC-3/STS-3 rate clocks from an input reference clock of 38.88, 51.84, or 77.76MHz. Additionally, the input reference clock is retimed and provided as a TTL/CMOS compatible output, which may be disabled to minimize switching noise. The SY89426 operates from a single +5 volt supply, and requires only a simple series RC loop filter. Coupling Micrel-Synergy's advanced PLL technology with our proprietary ASSETTM bipolar process has produced a clock generator IC which exceeds applicable Bellcore and ANSI specifications, while setting a new standard for performance and flexibility. TYPICAL APPLICATION PIN CONFIGURATION RETRFCK +3V VCC VCCO CK622P (PECL) CK622N 2X 50 622.08MHz CLOCK OUT +3V 25 24 23 22 21 20 19 CLOCK IN 0.1uF RFCK (TTL) GND GND SEL39 SEL78 RFCK VCC DISC VCC RST VCC +5V +5V FLTRP FLTRN 26 27 28 1 2 3 4 5 6 7 8 9 10 11 18 17 VCC VCC CK622P CK622N VCCO CK155 GND FLTRN FLTRP SY89426 CK155 (PECL) RETRFCK (TTL) GND RST DISC (TTL) (TTL) PLCC TOP VIEW J28-1 16 15 14 13 12 1000 SEL39 (TTL) SEL78 (TTL) 50 155.52MHz CLOCK OUT RETIMED REFOUT NC NC GND NC GND GND GND Rev.: F NC Amendment: /0 1 Issue Date: July, 1999 Micrel ClockWorksTM SY89426 FUNCTIONAL BLOCK DIAGRAM VCCA GND 5 7 FLTRP/N VCCO RST (TTL) RFCK (TTL) /f CHG PUMP 622MHz VCO FEEDBACK / 2/3/4 SEL39 (TTL) SEL78 (TTL) DIVIDER /4 CK622P (PECL) CK622N CK155 (PECL) RETRFCK (TTL) DISC (TTL) PIN DESCRIPTION INPUTS RFCK [Reference Clock] TTL Reference clock IN. (38.88, 51.84 or 77.76MHz). SEL39 [38.88MHz Select] TTL Logic HIGH on this pin denotes a 38.88MHz input reference clock. Tie to logic LOW if input is not 38.88MHz. SEL78 [77.76MHz Select] TTL Logic HIGH on this pin denotes a 77.76MHz input reference clock. Tie to logic LOW if input is not 77.76MHz. RST [Reset] TTL Tie to logic LOW for normal operation; logic HIGH forces reset of internal Phase Detector & feedback dividers. FLTRP, FLTRN [Loop Filter, Pos & Neg] Analog Connect a series RC loop filter between these pins. The suggested RC values are 500 and 0.1F, as shown in the Typical Application. DISC [Disable Clock] TTL Logic HIGH on this pin disables the Retimed Reference Clock output RETRFCK); if this output is not required, it is recommended that it be disabled to reduce switching noise. A logic LOW enables the output. OUTPUTS CK622P, CK622N [622 Clock Output] Differential PECL. 622.08MHz output clock from PLL B. CK155 [155 Clock Out] Single-ended PECL 155.52MHz output clock. RETRFCK [Retimed Reference Clock Out] TTL An output clock with the same frequency as the input Reference Clock (RFCK) and a 45-55% duty cycle. This output is derived by dividing the 622.08MHz output by the appropriate factor (e.g., divide by 16 for a 38.88MHz inout reference; divide by 12 for 51.84Mhz in; or divide by 8 for 77.76MHz in). POWER & GROUND VCC VCCO GND +5V for internal circuits. +5V for PECL outputs. Ground (0 volts). 2 Micrel ClockWorksTM SY89426 REFERENCE FREQUENCY SELECTION(1) SEL39 0 0 1 1 SEL78 0 1 0 1 fRFCK 51.84 77.76 38.88 77.76 NOTE: 1. Airflow greater than 500lfpm is maintained. ABSOLUTE MAXIMUM RATINGS(1), (2) Symbol VCC VI IOUT TA Tstore Power Supply Input Voltage Output Current Operating Temperature Range Storage Temperature Range -Continuous -Surge Parameter Rating 0 to +7 0 to VCC 50 100 -40 to +85 -65 to +150 Unit V V mA C C NOTES: 1. Permanent device damage may occur if ABSOLUTE MAXIMUM RATINGS are exceeded. This is a stress rating only and functional operation is not implied at conditions other than those detailed in the operational sections of this data sheet. Exposure to ABSOLUTE MAXIMUM RATING conditions for extended periods may affect device reliability. 2. Airflow greater than 500lfpm is maintained. PECL DC ELECTRICAL CHARACTERISTIC(1), (2) VCC = VCCO = +5V 5%; GND = 0V; TA = -40C to 85C TA = -40C Symbol VOH VOL VIH VIL IIL Parameter Output HIGH Voltage Output LOW Voltage Input HIGH Voltage Input LOW Voltage Input LOW Current (1) TA = 0C Min. VCC -1070 Max. VCC -790 TA = +25C Min. VCC -1030 Max. VCC -760 TA = +85C Min. VCC -960 Max. VCC -670 Unit mV mV mV mV A Min. VCC -1130 Max. VCC -840 VCC -2000 VCC -1600 VCC -2000 VCC -1230 VCC -890 VCC -1170 VCC -1580 VCC -2000 VCC -1580 VCC -2000 VCC -1545 VCC -840 VCC -1130 VCC -810 VCC -1060 VCC -720 (1) VCC -1950 VCC -1500 VCC -1950 0.5 -- 0.5 VCC -1480 VCC -1950 VCC -1480 VCC -1950 VCC -1445 -- 0.5 -- 0.3 -- NOTES: 1. Forcing one input at a time. Apply VIH (Max) or VIL (Min) to all other inputs. 2. Airflow greater than 500lfpm is maintained. TTL DC ELECTRICAL CHARACTERISTICS(1) VCC = VCCO = +5V 5%; GND = 0V; TA = -40C to 85C Symbol VOH VOL IOS VIH VIL Parameter Output HIGH Voltage Output LOW Voltage Output Short Circuit Current Input HIGH Voltage Input LOW Voltage Min. 2.4 -- -150 2.0 -- Max. -- 0.5 -60 -- 0.8 Unit V V mA V V Condition IOH = -2mA IOL = 4mA VOUT = 0 -- -- NOTE: 1. Airflow greater than 500lfpm is maintained. 3 Micrel ClockWorksTM SY89426 DC ELECTRICAL CHARACTERISTICS(1) -- TTL DC ELECTRICAL CHARACTERISTICS VCC = VCCO = +5V 5%; GND = 0V; TA = -40C to 85C Symbol IEE IOUT Parameter Internal Operating Current Termination Output Current Min. -- -- Typ. 79 11 Max. 120 -- Unit mA mA 50 to Vcc -2, 50% duty cycle Condition NOTE: 1. Airflow greater than 500lfpm is maintained. AC ELECTRICAL CHARACTERISTICS(1) VCC = VCCO = +5V 5%; GND = 0V; TA = -40C to 85C Parameter VCO Center Frequency Reference Clock (RFCK) Frequency Tolerance Reference Clock (RFCK) Input Duty Cycle Reference Clock (RETRFCK) Output Duty Cycle Acquisition Lock Time TTL Output Rise/Fall Time PECL Output Rise/Fall Time CK622 Output Duty Cycle CK155 Output Duty Cycle tRST - RST pulse width tp622 Static Phase Offset of CK622 tp155 Static Phase Offset of CK155 tpREF Static Phase Offset of RETRFCK NOTE: 1. Airflow greater than 500lfpm is maintained. Min. -- -- -- 45 40 -- -- -- 45 45 1 190 -250 -- Typ. 20 20 10 -- -- -- -- -- -- -- -- 400 -400 +3.5 Max. -- -- -- 55 60 15 2 500 55 55 -- 600 -750 -- Units MHz ppm ppm ppm % of UI % of UI sec ns ps % of UI % of UI sec ps ps ns 15pF load Nominal 77.76MHz 51.84MHz 38.88MHz Condition 622.08 1% 10% to 90% of amplitude, 15pF load 10% to 90%, 50 load, 5pF cap DC ELECTRICAL CHARACTERISTICS -- TTL TIMING WAVEFORM RFCK Input tp 622 CK622 Output tp REF RETRFCK Output tp 155(1) CK155 Output NOTE: 1. Does not apply to 52MHz reference 4 Micrel ClockWorksTM SY89426 JITTER GENERATION Jitter Generation Definition Bellcore TR-NWT-000499 (Issue 4), section 7.3.3 "Jitter generation is the process whereby jitter appears at the output port of an individual unit of digital equipment in the absence of applied input jitter." Jitter Generation Requirement Bellcore TA-NWT-000253 (Issue 2), section 5.6.5.2 "For Category II interfaces, jitter generation shall not exceed 0.01 UI rms. For OC-N and STSX-N interfaces, a high-pass measurement filter with a 12kHz cutoff frequency shall be used." The low-pass cutoff frequency of the measurement filter shall be higher than 5MHz. The characteristic of the measurement filter is shown below. SONET OC-12 Category II Jitter Generation Measurement Filter Characteristics UI (rms) 0.01 +20dB/decade 12kHz Figure 1 Frequency 5MHz (minimum) PRODUCT ORDERING CODE Ordering Code SY89426JC SY89426JCTR SY89426JI SY89426JITR Package Type J28-1 J28-1 J28-1 J28-1 Operating Range Commercial Commercial Industrial Industrial 5 Micrel ClockWorksTM SY89426 28 LEAD PLCC (J28-1) Rev. 03 MICREL-SYNERGY TEL 3250 SCOTT BOULEVARD SANTA CLARA CA 95054 USA FAX + 1 (408) 980-9191 + 1 (408) 914-7878 WEB http://www.micrel.com This information is believed to be accurate and reliable, however no responsibility is assumed by Micrel for its use nor for any infringement of patents or other rights of third parties resulting from its use. No license is granted by implication or otherwise under any patent or patent right of Micrel Inc. (c) 2000 Micrel Incorporated 6 |
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