SY89426JY

SONET OC-12/OC-3 CLOCK SYNTHESIZER Micrel, Inc. Precision Edge® ® SY89426 Precision Edge SY89426 FEATURES ■ Single chip source for 622.08MHz and 155.52MHz clocks ■ 622.08MHz output is differential PECL, 155.52MHz output is single-ended PECL ■ TTL/CMOS compatible inputs and reference output ■ SONET compliant jitter performance (≤0.01UI) ■ Choice of three reference frequencies ■ Only 395mW (typ) ■ Complies with Bellcore, CCITT and ANSI standards ■ Single +5 volt power supply ■ Fully compatible with industry standard 10KH I/O levels ■ Available in 28-pin PLCC package Precision Edge® DESCRIPTION Micrel'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'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. TYPICAL APPLICATION +5V +5V +3V VCC CLOCK IN VCCO RFCK (TTL) 2X 50Ω CK622P (PECL) 622.08MHz CLOCK OUT CK622N 0.1uF +3V FLTRN FLTRP SY89426 1000Ω CK155 (PECL) SEL39 (TTL) RETRFCK (TTL) SEL78 (TTL) GND 50Ω 155.52MHz CLOCK OUT RETIMED REFOUT RST DISC (TTL) (TTL) Precision Edge is a registered trademark of Micrel, Inc. ASSET is a trademark of Micrel, Inc. M9999-112105 hbwhelp@micrel.com or (408) 955-1690 Rev.: H 1 Amendment: /0 Issue Date: November 2005 Precision Edge® SY89426 Micrel, Inc. RETRFCK Ordering Information(1) DISC VCC VCC FLTRN FLTRP RST PACKAGE/ORDERING INFORMATION Package Type Operating Range Package Marking Lead Finish SY89426JC J28-1 Commercial SY89426JC Sn-Pb SY89426JCTR(2) J28-1 Commercial SY89426JC Sn-Pb SY89426JY(3) J28-1 Industrial SY89426JY with Pb-Free bar line indicator Matte-Sn Pb-Free SY89426JYTR(2, 3) J28-1 Industrial SY89426JY with Pb-Free bar line indicator Matte-Sn Pb-Free Part Number 25 24 23 22 21 20 19 GND 26 GND 27 SEL39 28 SEL78 1 RFCK 2 VCC NC 18 VCC 17 VCC CK622P 16 PLCC TOP VIEW J28-1 15 CK622N 14 VCCO 3 13 CK155 4 12 GND GND 10 11 GND 9 NC 8 NC 7 NC 6 GND GND 5 Notes: 1. Contact factory for die availability. Dice are guaranteed at TA = 25°C, DC Electricals only. 2. Tape and Reel. 3. Pb-Free package is recommended for new designs. 28-Pin PLCC (J28-1) PIN DESCRIPTION INPUTS OUTPUTS RFCK [Reference Clock] TTL Reference clock IN. (38.88, 51.84 or 77.76MHz). CK622P, CK622N [622 Clock Output] Differential PECL. 622.08MHz output clock from PLL B. 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. 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). 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. POWER & GROUND FLTRP, FLTRN [Loop Filter, Pos & Neg] Analog Connect a series RC loop filter between these pins. The suggested RC values are 500Ω and 0.1µF, as shown in the Typical Application. VCC VCCO GND 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. M9999-112105 hbwhelp@micrel.com or (408) 955-1690 2 +5V for internal circuits. +5V for PECL outputs. Ground (0 volts). Precision Edge® SY89426 Micrel, Inc. FUNCTIONAL BLOCK DIAGRAM VCCA GND 5 RFCK (TTL) Φ/f VCCO FLTRP/N 7 CHG PUMP FEEDBACK ÷ 2/3/4 RST (TTL) 622MHz VCO CK622P (PECL) DIVIDER ÷4 CK622N SEL39 (TTL) CK155 (PECL) SEL78 (TTL) RETRFCK (TTL) DISC (TTL) REFERENCE FREQUENCY SELECTION(1) SEL39 SEL78 fRFCK 0 0 51.84 0 1 77.76 1 0 38.88 1 1 77.76 NOTE: 1. Airflow greater than 500lfpm is maintained. M9999-112105 hbwhelp@micrel.com or (408) 955-1690 3 Precision Edge® SY89426 Micrel, Inc. ABSOLUTE MAXIMUM RATINGS(1), (2) Symbol Parameter Rating Unit VCC Power Supply 0 to +7 V VIN Input Voltage 0 to VCC V IOUT Output Current –Continuous 50 mA –Surge 100 mA –40 to +85 °C +260 °C –65 to +150 °C TA Operating Temperature Range TLEAD Lead Temperature (soldering, 20 sec.) Tstore Storage Temperature Range 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 = –40°C to 85°C TA = –40°C Symbol TA = 0°C TA = +25°C TA = +85°C Parameter Min. Max. Min. Max. Min. Max. Min. Max. Unit VOH Output HIGH Voltage VCC -1130 VCC -840 VCC -1070 VCC -790 VCC -1030 VCC -760 VCC -960 VCC -670 mV VOL Output LOW Voltage VCC -2000 VCC -1600 VCC -2000 VCC -1580 VCC -2000 VCC -1580 VCC -2000 VCC -1545 mV VCC -1230 VCC -840 VCC -720 mV VCC -1480 VCC -1950 VCC -1480 VCC -1950 VCC -1445 mV VIH Input HIGH Voltage VIL Input LOW Voltage IIL Input LOW Current (1) (1) VCC -890 VCC -1170 VCC -1950 VCC -1500 VCC -1950 0.5 — 0.5 VCC -1130 — VCC -810 0.5 — VCC -1060 0.3 — µA 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 = –40°C to 85°C Symbol Parameter Min. Max. Unit Condition VOH Output HIGH Voltage 2.4 — V IOH = –2mA VOL Output LOW Voltage — 0.5 V IOL = 4mA IOS Output Short Circuit Current –150 –60 mA VOUT = 0 VIH Input HIGH Voltage 2.0 — V — VIL Input LOW Voltage — 0.8 V — NOTE: 1. Airflow greater than 500lfpm is maintained. (1) DC ELECTRICAL ELECTRICAL CHARACTERISTICS — TTL DC CHARACTERISTICS VCC = VCCO = +5V ± 5%; GND = 0V; TA = –40°C to 85°C Symbol Parameter Min. Typ. Max. Unit IEE Internal Operating Current — 79 120 mA IOUT Termination Output Current — 11 — mA NOTE: 1. Airflow greater than 500lfpm is maintained. M9999-112105 hbwhelp@micrel.com or (408) 955-1690 4 Condition 50Ω to Vcc -2, 50% duty cycle Precision Edge® SY89426 Micrel, Inc. AC ELECTRICAL CHARACTERISTICS(1) VCC = VCCO = +5V ± 5%; GND = 0V; TA = –40°C to 85°C Parameter Min. Typ. Max. 622.08 ±1% VCO Center Frequency Units Condition MHz Nominal 77.76MHz 51.84MHz 38.88MHz Reference Clock (RFCK) Frequency Tolerance — — — ±20 ±20 ±10 — — — ppm ppm ppm Reference Clock (RFCK) Input Duty Cycle 45 — 55 % of UI Reference Clock (RETRFCK) Output Duty Cycle 40 — 60 % of UI Acquisition Lock Time — — 15 µsec TTL Output Rise/Fall Time — — 2 ns 10% to 90% of amplitude, 15pF load PECL Output Rise/Fall Time — — 500 ps 10% to 90%, 50Ω load, 5pF cap CK622 Output Duty Cycle 45 — 55 % of UI CK155 Output Duty Cycle 45 — 55 % of UI tRST – RST pulse width 1 — — µsec tp622 Static Phase Offset of CK622 190 400 600 ps tp155 Static Phase Offset of CK155 –250 –400 –750 ps — +3.5 — ns tpREF Static Phase Offset of RETRFCK NOTE: 1. Airflow greater than 500lfpm is maintained. DC ELECTRICAL CHARACTERISTICS — TTL TIMING WAVEFORM RFCK Input tp 622 CK622 Output tp REF RETRFCK Output tp 155(1) CK155 Output NOTE: 1. M9999-112105 hbwhelp@micrel.com or (408) 955-1690 Does not apply to 52MHz reference 5 15pF load Precision Edge® SY89426 Micrel, Inc. 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 Frequency Figure 1 M9999-112105 hbwhelp@micrel.com or (408) 955-1690 6 5MHz (minimum) Precision Edge® SY89426 Micrel, Inc. 28-PIN PLCC (J28-1) Rev. 03 MICREL, INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 TEL + 1 (408) 944-0800 FAX + 1 (408) 474-1000 WEB USA http://www.micrel.com The information furnished by Micrel in this datasheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use. Micrel reserves the right to change circuitry and specifications at any time without notification to the customer. Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant injury to the user. A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is at Purchaser’s own risk and Purchaser agrees to fully indemnify Micrel for any damages resulting from such use or sale. © 2005 Micrel, Incorporated. M9999-112105 hbwhelp@micrel.com or (408) 955-1690 7