VITESSE

SEMICONDUCTOR CORPORATION

Data Sheet

VSC8121

2.488GHz SONET/SDH

Clock Generator

Page 6

G52163-0, Rev 4.2

04/16/01

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

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

Internet: www.vitesse.com

DC Characteristics

Table 3: Low Speed I/O

Table 4: High-Speed Differential Outputs

Note: Output jitter characteristics apply for differential outputs.

Table 5: Power Supply Currents

Parameter

Description

Min

Typ

Max

Units

Conditions

Output HIGH voltage (TTL)

2.4

——

Output LOW voltage (TTL)

——

0.5

V

Input HIGH voltage (TTL)

2.0

—

3.47

V

—

Input LOW voltage (TTL)

0

—

0.8

V

—

Input HIGH current (TTL)

—

50

500

µAV

Input LOW current (TTL)

——

-500

µAV

Parameter

Description

Min

Typ

Max

Units

Conditions

Output differential voltage

450

—

800

mV

Output common-mode voltage

0.40

—

0.25

mV

Termination #1

(See Figure 3)

0.80

—

0.50

mV

Termination #2

(See Figure 3)

0.80

—

0.50

mV

Termination #3

(See Figure 3)

Parameter

Description

Min

Typ

Max

Units

Conditions

200

mA

Outputs Open

Power dissipation

0.7

W

Outputs Open