Frequency Timing and Translation Modules NEW Frequency Controlled Crystal Oscillator (FCXO) Stratum3 Module Model Name NW50M50LA/B n Main Application SONET, SDH, FTTH, Communications equipment n Features l Two reference input frequencies in 9 steps from 8 kHz to 77.76 MHz. l Compliant with Telecordia GR1244CORE, GR253. l Hit-less reference switching. l Frequency ramp control during reference switching. * Module markings may be changed without notice. l Simple hardware control for operational modes (Freerun, Locked to Ref 1 or 2 and Holdover) l Two output signals: one fixed at 8 kHz, one selectable (see specifications) up to 77.76 MHz. n Specifications Model Item Supply Voltage (VCC) NW50M50LA NW50M50LB +5.0 V DC ±5% Current Consumption TCXO version 125 mA typ OCXO version 525 mA typ turn on and 250 mA Steady state 0 to +70°C Operating Temp. Range 2-CMOS Input Levels 8 kHz, 1.544 MHz, 2.048 MHz, 12.96 MHz, 19.44 MHz, 25.92 MHz, 38.88 MHz, 51.84 MHz or 77.76 MHz Input Reference Frequency (HMz) Two CMOS outputs Output Levels OPT Sync Outputs: 12.96 MHz, 19.44 MHz, 25.92 MHz, 38.88 MHz, 51.84 MHz or 77.76 MHz Output Frequencies (MHz) ±4.6×10−6 max. Free-run accuracy 0.1 Hz PLL bandwidth n List of Ordering Codes n Control Functions Output frequency (MHz) CNTL B 0 0 1 1 Ordering Code NW50M50LA-[ OTP Sync Output: One selectable up to 77.76 MHz NW50M50LB-[ ]-NSA3438A ]-NSA3438B [ ]: OTP Sync Output to order. For example, in 19.44 MHz case, NW50M50LA-19.44M-NSA3438A CNTL A 0 1 0 1 Mode of operation FREE-RUN Lock to REF 1 Lock to REF 2 Holdover n Dimensions 50.8±0.3 mm 14.8max 1.6±0.1 5.08±0.3 5.08±0.3 1 18 50.8±0.3 9 40.64±0.3 10 0.51±0.3 0.51±0.3 Detail A Detail A 5.29±0.3 40.64±0.3 18 − ø1.78±0.2 18 − ø1.0±0.13 PAD No. Connection #1 Holdover #2 REF1 #3 REF2 #4 FREE-RUN #5 GND #6 ALARM OUT #7 CNTL A #8 CNTL B #9 PLL UNLOCK #10 GND #11 SYNC OUT #12 GND #13 OPT Sync OUT #14 GND #15 EX REF 2 #16 GND #17 EX REF 1 #18 +5V co35_080205_NW50M50LA&B_e1