VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
Multi-Rate SONET/SDH
VSC8122
Clock and Data Recovery IC
Pin #
Name
I/O
Level
Description
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
VCC
VEE
I
I
+3.3V typ.
GND typ.
+3.3V typ.
HS
Positive power supply
Negative power supply
Positive power supply
VCC
I
DO-
O
O
I
High-speed data output, complement.
High-speed data output, true
Positive power supply
DO+
HS
VCC
+3.3V typ.
GND typ.
+3.3V typ.
GND typ.
LVPECL
LVPECL
LCPECL
LVPECL
GND typ.
+3.3V typ.
—
VEE
I
Negative power supply
VCC
I
Positive power supply
VEE
I
Negative power supply
REFCK1-
REFCK1+
REFCK0-
REFCK0+
VEE
I
Reference clock 1 input, complement
Reference clock 1 input, true
Reference clock 0 input, complement
Reference clock 0 input, true
GND power supply
I
I
I
I
VCC
I
Positive power supply
REF_SEL[0]
REF_SEL[1]
VCC
I
Reference clock rate select pin 0
Reference clock rate select pin 1
I
—
I
+3.3V typ. Positive power supply
GND typ. Negative power supply
GND typ. Negative power supply
+3.3V typ. Positive power supply
VEE
I
VEE
I
VCC
I
DI-
I
HS
HS
High-speed data input, complement
High-speed data input, true
DI+
I
VCC
I
+3.3V typ. Positive power supply
High-speed data input termination voltage (may be connected
to ground through a series AC-coupling capacitor)
59
VTERM
I
0V->3.3V
60
61
62
63
64
VEE
VCC
NC
I
I
GND typ. Negative power supply
+3.3V typ. Positive power supply
—
I
—
No connect, leave unconnected
VCC
NC
+3.3V typ. Positive power supply
—
—
No connect, leave unconnected(1)
NOTE: (1) No connect (NC) pins must be left unconnected, or floating. Connecting any of these pins to either the positive or neg-
ative power supply rails may cause improper operation or failure of the device, or in extreme cases, cause permanent
damage to the device.
© 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 10
G52228-0, Rev 4.1
01/05/01
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
