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| VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet VSC7928 Features * Rise Times Less Than 100ps * High Speed Operation (Up to 3.2Gb/s NRZ Data) * Differential or Single-Ended Inputs * Single Supply * ECL Compatible Clock and Data Inputs * Direct Access to Modulation and Bias FETs * Data Density Monitors * On-chip Reclocking Register * On-chip Mux for Clocked or Non-clocked Applications * On-chip 50 Input Termination: Clock and Data * Enhanced Pinout SONET/SDH 3.2Gb/s Laser Diode Driver Applications * SONET/SDH @ 622Mb/s, 1.244Gb/s, 2.488Gb/s, and 3.125Gb/s * Full Speed Fibre Channel (1.062Gb/s) General Description The VSC7928 is a single 5V supply, 3.2Gb/s laser diode driver with direct access to the laser modulation and bias FETs. Laser bias and modulation currents are set by external components allowing precision monitoring and setting of the current levels. Data density outputs are provided to allow the user to adjust the laser bias in high unbalanced data applications. Clock and data inputs are differentially terminated to 50. VSC7928 Block Diagram MK NMK NIOUT DIN 50 ** DINTERM* 50 ** NDIN DCC CLK 50 ** CLKTERM* 50 ** NCLK SEL MIP *Terminated to Off-chip Capacitor **On Die Components MIB VIB VIP IMOD IBIAS M U X IOUT DQ IBIAS G52246-0, Rev 3.0 04/05/01 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com Page 1 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet SONET/SDH 3.2Gb/s Laser Diode Driver Table 1: Signal Pin Reference Signal DIN, NDIN MK, NMK NIOUT IOUT VSS GND VIP MIP VIB MIB IBIAS CLK, NCLK DINTERM CLKTERM DCC SEL GND/NC Total Pins VSC7928 Description Data Input and Data Reference, On-chip 50 Termination Data Density Differential Outputs Laser Modulation Current Output (Complementary) Laser Modulation Current Output (To Laser Cathode) Negative Voltage Rail Positive Voltage Rail Modulation Gate Node Modulation Source Node Bias Gate Node Bias Source Node Laser Bias Output (To Laser Cathode) Clock Input and Clock Reference, On-chip 50 Termination Data Reference Clock Reference Duty Cycle Control, Leave Floating Clk/Non-clk Data Select No connection (leave floating or connect to GND) Type In Out Out Out Pwr Pwr In In In In Out In In In In In Pwr Level ECL ECL # Pins 2 2 1 1 2 5/6(1) 1 1 1 1 1 2 1 1 1 1 7(1) 24/32* -- -- Pwr Pwr DC DC DC DC DC ECL DC DC DC DC DC -- -- NOTE: (1) Applicable to 32-pin TQFP package only. Table 2: Mux Select Logic Table SEL VSS GND N/C Mode Select Clocked Data In Non-clocked Data In Non-clocked Data In Table 3: Absolute Maximum Ratings Symbol VSS TJ TSTG Rating Negative Power Supply Voltage Maximum Junction Temperature Storage Temperature Limit VCC to -6.0V -55C to + 125C -65C to +150C Table 4: Recommended Operating Conditions Symbol GND VSS TCl TJ Parameter Positive Voltage Rail Negative Voltage Rail Operational Temperature Junction Temperature (1) Min -- -5.5 -40 Typ 0 -5.2 Max -- -4.9 85 (2) Units V V C C Conditions -- -- -- Power dissipation = 1.3W 125 NOTES: (1) Lower limit of specification is ambient temperature and upper limit is case temperature. (2) See section "Calculation of the Maximum Case Temperature" for detailed maximum temperature calculations. Page 2 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com G52246-0, Rev 3.0 04/05/01 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet VSC7928 Table 5: High Speed Inputs and ECL Outputs Symbol VIN VCM VOH VOL VIN SONET/SDH 3.2Gb/s Laser Diode Driver Parameter Single-ended Input Voltage Swing Differential Input Common Mode Range ECL Output High Voltage ECL Output Low Voltage On-Chip Terminations Min 300 -2.3 -1200 Typ -- -- -- -- -- Max 1500 -1.3 Units mVp-p V mV mV Conditions VCM = -2.0V VSS = -5.2V 50 to -2.0V 50 to -2.0V -- -1600 65 -- 35 Table 6: Power Dissipation Symbol IVSS PD Parameter Power Supply Current (VSS) Total Power Dissipation Min -- -- Typ 80 -- Max 120 700 Units mA mW Conditions VSS = -5.5V, IMOD = IBIAS = 0mA, MK/NMK open circuit VSS = -5.5V, IMOD = IBIAS = 0mA, RLOAD = 25 to GND, MK/NMK terminated 50 to -2V Table 7: Laser Driver DC Electrical Specifications Symbol IBIAS IMOD VIB VIP VOCM Parameter Programmable Laser Bias Current Programmable Modulation Current Laser Bias Control Voltage Laser Modulation Control Voltage Output Voltage Compliance Min 2 2 -- -- Typ -- -- -- -- GND 3V Max 100 100 VSS + 2.1 VSS + 2.1 -- Units mA mA V V V Conditions IBIAS = 50mA IMOD= 60mA VSS = -5.2V -- Table 8: Laser Driver AC Electrical Specifications Symbol tR, tF tSU tH Parameter Output Rise and Fall Times Data to Clock Setup Time Hold Time Min -- -- 20 Typ -- 50 50 Max 100 Units ps ps ps Conditions 25 load, 20%-80%, 20mA < IMOD < 60mA, IBIAS = 60mA 90 -- -- -- G52246-0, Rev 3.0 04/05/01 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com Page 3 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet SONET/SDH 3.2Gb/s Laser Diode Driver Figure 1: On-Chip Data and Clock Input Configuration VSC7928 GND DIN (CLK) DINTERM (CLKTERM) NDIN (NCLK) GND DATA BUFFER (CLOCK BUFFER) X * 50 * * 4.0K 6.4K X * 50 X *On-chip Components VSS VSS DINTERM to -2.0V for Differential ECL Inputs Figure 2: Single-Ended Operation 7928 DATA SOURCE 0.1f GND 0.1f DIN DINTERM NDIN 0.1f 0.1f GND CLOCK SOURCE 0.1f GND CLK CLKTERM NCLK 0.1f GND Page 4 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com G52246-0, Rev 3.0 04/05/01 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet VSC7928 SONET/SDH 3.2Gb/s Laser Diode Driver Figure 3: Single-Ended AC-Coupled GND DIN (CLK) 0.1f SOURCE DINTERM (CLKTERM) X 50 4.0K -2.0V 50 6.4K X X 0.1f GND NDIN (NCLK) 0.1f VSS GND Figure 4: Differential AC-Coupled GND 0.1f SOURCE 0.1f DIN (CLK) X DINTERM (CLKTERM) 50 4.0K -2.0V X 0.1f GND NDIN (NCLK) 50 6.4K X VSS Figure 5: Differential DC-Coupled GND DIN (CLK) X SOURCE DINTERM (CLKTERM) 50 4.0K -2.0V X NDIN (NCLK) 50 6.4K X -2.0V VSS G52246-0, Rev 3.0 04/05/01 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com Page 5 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet SONET/SDH 3.2Gb/s Laser Diode Driver Figure 6: Control Signals VIP and VIB I (MIB) 30 mA VSC7928 VIB VSS + 1.5 Volts (Typical) Typical Bias Current v.s. Bias Voltage I (MIP) 60 mA VIP VSS + 1.5 Volts (Typical) Typical Modulation Current v.s. Modulation Voltage Figure 7: Simplified Output Structure NIOUT IOUT IBIAS X X X VIP X IMOD OUTPUT DIFF PAIR IBIAS X VIB X MIP X MIB Page 6 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com G52246-0, Rev 3.0 04/05/01 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet VSC7928 SONET/SDH 3.2Gb/s Laser Diode Driver Figure 8: Pad Assignments for VSC7928 Die 1720m 1620m 50m 50m 50m 120 120m 150m PAD 34 PAD 33 PAD 32 PAD 31 PAD 30 PAD 29 PAD 28 PAD 27 PAD 26 DCC VSS VSS VSS VSS VIP MIP MIP MIB PAD 1 N/C PAD 2 NDIN PAD 3 DIN PAD 4 DINT PAD 5 CLOCKT PAD 6 CLOCK PAD 7 NCLOCK PAD 8 N/C SEL PAD 9 GND PAD 10 PAD 25 VIB PAD 24 GND PAD 23 IOUT PAD 22 IOUT 30m 1620m PAD 21 NIOUT PAD 20 NIOUT PAD 19 GND PAD 18 IBIAS GND GND GND GND GND NMARK MARK PAD 11 PAD 12 PAD 13 PAD 14 PAD 15 PAD 16 PAD 17 1720m 50m Die Size: Actual Die Size: Pad Size: Pad Pitch: Space Between Pads: 1620m x 1620m 1720mx1720m (after the die are cut up) 120m x 120m 150m 30m G52246-0, Rev 3.0 04/05/01 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com Page 7 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet SONET/SDH 3.2Gb/s Laser Diode Driver VSC7928 Package Information - 32 Pin Plastic TQFP Package Dimension A A1 A2 D D1 E E1 L e b ddd ccc mm 1.60 .10 1.40 9.00 7.00 9.00 7.00 .60 .80 .35 0 - 7 .20 .10 Tolerance MAX .05 .05 .20 .10 .20 .10 +.15/-.10 BASIC .05 MAX MAX Note: Package lid and bottom heat spreader are electrically connected to GND within the package. Page 8 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com G52246-0, Rev 3.0 04/05/01 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet VSC7928 32-Pin Plastic Package Pin Designation SONET/SDH 3.2Gb/s Laser Diode Driver GND DCC GND MIB MIP VSS VSS VIP GND NDIN DIN DINT CLKT CLK NCLK GND GND VIB GND IOUT NIOUT GND GND IBIAS GND SEL GND GND GND NMK GND MK G52246-0, Rev 3.0 04/05/01 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com Page 9 VITESSE SEMICONDUCTOR CORPORATION Preliminary Data Sheet SONET/SDH 3.2Gb/s Laser Diode Driver VSC7928 Ordering Information The order number for this product is formed by a combination of the device number, and package style. VSC7928 Device Type VSC7928: 3.2Gb/s Laser Diode Driver XX Package Style RA: 32-Pin QFP Gull Wing Plastic Package X : Bare Die Notice Vitesse Semiconductor Corporation ("Vitesse") provides this document for informational purposes only. This document contains pre-production information about Vitesse products in their concept, development and/or testing phase. All information in this document, including descriptions of features, functions, performance, technical specifications and availability, is subject to change without notice at any time. Nothing contained in this document shall be construed as extending any warranty or promise, express or implied, that any Vitesse product will be available as described or will be suitable for or will accomplish any particular task. Vitesse products are not intended for use in life support appliances, devices or systems. Use of a Vitesse product in such applications without written consent is prohibited. Page 10 (c) VITESSE SEMICONDUCTOR CORPORATION * 741 Calle Plano * Camarillo, CA 93012 Tel: (800) VITESSE * FAX: (805) 987-5896 * Email: prodinfo@vitesse.com Internet: www.vitesse.com G52246-0, Rev 3.0 04/05/01 |
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