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
DINTERM
CLKTERM
DCC
SEL
Total Pins
VSC7927
Description
Data Input and Data Reference, On-chip 50Ω 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 50Ω Termination
Data Reference
Clock Reference
Duty Cycle Control, Leave Floating
Clk/Non-clk Data Select
Type
In
Out
Out
Out
Pwr
Pwr
In
In
In
In
Out
In
In
In
In
In
Level
ECL
ECL
# Pins
2
2
1
1
2
5
1
1
1
1
1
2
1
1
1
1
24
—
—
Pwr
Pwr
DC
DC
DC
DC
DC
ECL
DC
DC
DC
DC
—
—
Table 2: Mux Select Logic Table
SEL
V
SS
GND
N/C
Mode Select
Clocked Data In
Non-clocked Data In
Non-clocked Data In
Table 3: 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 4: Recommended Operating Conditions
Symbol
GND
VSS
T
Cl
T
J
Parameter
Positive Voltage Rail
Negative Voltage Rail
Operational Temperature
(1)
Junction Temperature
Min
—
-5.5
-40
Typ
0
-5.2
Max
—
-4.9
85
(2)
125
Units
V
V
°C
°C
Conditions
—
—
—
Power dissipation = 1.3W
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
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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
G52201-0, Rev 3.0
04/05/01/01
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
