VITESSE

SEMICONDUCTOR CORPORATION

Preliminary Data Sheet

VSC7939

SONET/SDH 3.125Gb/s

Laser Diode Driver with Automatic Power Control

G52350-0, Rev 3.2

Page 3

02/26/01

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tion does not change with temperature.

Table 3: PECL and TTL/CMOS Inputs and Outputs Specifications

Modulation Current Absolute Accuracy

±15

%

See Note 2

Modulation Current Stability

-480

-50

480

ppm/

°C

250

37

A/A

29

A/A

Symbol

Parameter

Min

Typ

Max

Units

Conditions

Differential Input Voltage

100

1600

(DATA+)-(DATA-)

Common-Mode Input Voltage

1.49

1.32

V

PECL-compatible

Clock and Data Input Current

-1

10

µA

TTL Input High Voltage

(ENABLE, LATCH)

2.0

V

TTL Input Low Voltage

(ENABLE, LATCH)

0.8

V

TTL Output High Voltage (FAIL)2.4

0.3

V

Sourcing 50µA

TTL Output Low Voltage (FAIL)

0.1

0.44

V

Sinking 100µA

Symbol

Parameter

Min

Typ

Max

Units

Conditions