VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
2.488GHz SONET/SDH
Clock Generator
VSC8121
DC Characteristics
Table 3: Low Speed I/O
Parameter
Description
Min
Typ
Max
Units
Conditions
VOH
VOL
VIH
VIL
IIH
Output HIGH voltage (TTL)
Output LOW voltage (TTL)
Input HIGH voltage (TTL)
Input LOW voltage (TTL)
Input HIGH current (TTL)
Input LOW current (TTL)
2.4
—
2.0
0
—
—
—
—
50
—
—
0.5
V
V
IOH = -1.0 mA
IOL = +1.0 mA
—
3.47
0.8
V
V
—
—
—
500
-500
µA
µA
VIN = 2.4V
VIN = 0.5V
IIL
Table 4: High-Speed Differential Outputs
Parameter
Description
Min
Typ
Max
Units
Conditions
VOD
Output differential voltage
450
—
800
mV
VCC
0.40
-
VCC
0.25
-
Termination #1
(See Figure 3)
—
—
—
mV
mV
mV
VCC
0.80
-
VCC
0.50
-
Termination #2
(See Figure 3)
VOCM
Output common-mode voltage
VCC
0.80
-
VCC
0.50
-
Termination #3
(See Figure 3)
Note: Output jitter characteristics apply for differential outputs.
Table 5: Power Supply Currents
Parameter
Description
Min
Typ
Max
Units
Conditions
ICC
PD
Power supply current from VCC
Power dissipation
200
0.7
mA
W
Outputs Open
Outputs Open
© VITESSE SEMICONDUCTOR CORPORATION • 741 Calle Plano • Camarillo, CA 93012
Tel: (800) VITESSE • FAX: (805) 987-5896 • Email: prodinfo@vitesse.com
Internet: www.vitesse.com
Page 6
G52163-0, Rev 4.2
04/16/01
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