VITESSE
SEMICONDUCTOR CORPORATION
Advance Product Information
SC7937
Features
• Rise Times Typically 100ps
• High Speed Operation
(Up to 2.5Gb/s NRZ Data)
• 3 Volt Output Voltage Compliance
• Single-ended or Differential Input Operation
Single Supply 2.5 Gb/s
Voltage Driver
• Single Power Supply, 5 Volt or 5.2 Volts
• Direct Access to Modulation and Bias FET’s
• On Die Mux for Clocked or Non-clocked
Applications
• On-chip 50 Ohm Input Termination: Clock
and Data
Introduction
The VSC7937 is a single 5V supply, 2.5Gb/s voltage driver with direct access to the output modulation and
bias FET’s. The output stage can drive 60 mA into 50 Ohms with adequate output voltage compliance. Output
bias and modulation currents are set by external components allowing precision monitoring and setting of the
voltage levels.
Applications
• SONET/SDH @ 622Mb/s, 1.244Gb/s, 2.488Gb/s
• Full Speed Fibre Channel (1.062 Gb/s)
VSC7937 Block Diagram
NOUT OUT
I
NOUT
DIN
50
Ω
**
DINTERM*
50
Ω
**
NDIN
D Q
M
U
X
IBIAS1
IMOD
IBIAS2
VIP
CLK
50
Ω
**
CLKTERM*
NCLK
MIB2
SEL
SEL
MIP
MIB1
50
Ω
**
VIB2
VIB1
*Terminated to Off-chip Capacitor
**On Die Components
G52200-0, Rev 2.2
5/22/00
VITESSE
SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
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