VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Data Sheet
SONET/SDH 2.5Gb/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
DCC
Total Pins
VSC7925
Description
Data Input and Data Reference
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
Duty Cycle Control, Leave Floating
Type
In
Out
Out
Out
Pwr
Pwr
In
In
In
In
Out
In
In
Level
ECL
# Pins
2
2
1
1
Pwr
Pwr
DC
DC
DC
DC
DC
DC
4
6
1
1
1
1
1
2
1
24
Table 2: Absolute Maximum Ratings
Symbol
V
SS
T
J
T
STG
Rating
Negative Power Supply Voltage
Maximum Junction Temperature
Storage Temperature
Limit
V
CC
to -6.0V
-55°C to + 125°C
-65°C to +150°C
Table 3: High-Speed Inputs and ECL Outputs
Symbol
V
IN
V
CM
V
OH
V
OL
Parameter
Single-ended Input Voltage Swing
Differential Input Common Mode
Range
ECL Output High Voltage
ECL Output Low Voltage
Min
300
-3.3
-1200
-2000
Typ
Max
1500
-1.3
-500
-1600
Units
mV
V
mV
mV
Conditions
V
CM
= -2.5V
V
SS
= -5.2V
50Ω to -2.0V
50Ω to -2.0V
Page 2
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VITESSE
SEMICONDUCTOR CORPORATION
• 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
G52157-0, Rev 3.2
05/01/01
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
