VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7925

SONET/SDH 2.5Gb/s Laser Diode Driver

Page 2

G52157-0, Rev 3.2

05/01/01

© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012

Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com

Internet: www.vitesse.com

Table 1: Signal Pin Reference

Table 2: Absolute Maximum Ratings

Table 3: High-Speed Inputs and ECL Outputs

Signal

Type

Level

# Pins

Description

DIN, NDIN

In

2

Data Input and Data Reference

MK, NMK

Out

ECL

2

Data Density Differential Outputs

NIOUT

Out

1

Laser Modulation Current Output (Complementary)

IOUT

Out

1

Laser Modulation Current Output (To Laser Cathode)

VSS

Pwr

Pwr

4

Negative Voltage Rail

GND

Pwr

Pwr

6

Positive Voltage Rail

VIP

In

DC

1

Modulation Gate Node

MIP

In

DC

1

Modulation Source Node

VIB

In

DC

1

Bias Gate Node

MIB

In

DC

1

Bias Source Node

IBIAS

Out

DC

1

Laser Bias Output (To Laser Cathode)

CLK, NCLK

In

2

Clock Input and Clock Reference

DCC

In

DC

1

Duty Cycle Control, Leave Floating

Total Pins

24

Symbol

Rating

Limit

Negative Power Supply Voltage

Maximum Junction Temperature

-55°C to + 125°C

Storage Temperature

-65°C to +150°C

Symbol

Parameter

Min

Typ

Max

Units

Conditions

Single-ended Input Voltage Swing

300

1500

mV

Differential Input Common Mode

Range

-3.3

-1.3

V

ECL Output High Voltage

-1200

-500

mV

50

Ω to -2.0V

ECL Output Low Voltage

-2000

-1600

mV

50

Ω to -2.0V