VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
VSC8121
Table 6: Package Pin Identification
Signal Name
NC
NC
NC
NC
NC
NC
NC
V
CCT
NC
NC
NC
NC
NC
V
EET
REFCLK
REFSEL[0]
REFSEL[1]
LSCLK
V
EE
NC
NC
NC
NC
NC
NC
V
CC
CO
CON
V
CCP
NC
NC
NC
NC
NC
NC
V
EEANA
V
CCANA
NC
2.488GHz SONET/SDH
Clock Generator
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
I/O
-
-
-
-
-
-
-
Positive Supply
-
-
-
-
-
Negative Supply
TTL Input
TTL Input
TTL Input
TTL Output
Negative Supply
-
-
-
-
-
-
Positive Supply
Output
Output
Positive Supply
-
-
-
-
-
-
Negative Supply
Positive Supply
-
Level
-
-
-
-
-
-
-
3.3V
-
-
-
-
-
GND
TTL
TTL
TTL
TTL
GND
-
-
-
-
-
-
3.3V
2.7 - 3.3V
2.7 - 3.3V
3.3V
-
-
-
-
-
-
GND
3.3V
-
Description
Do not connect, leave open
(1)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
For TTL I/O
Do not connect, leave open
(1)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
For TTL I/O
Reference Clock
Selects Reference Frequency
Selects Reference Frequency
Low Speed PLL Output
Do not connect, leave open
(1)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
High-Speed Clock Out
High-Speed Clock Out Complement
Supply for High-Speed Outputs
(2)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
Do not connect, leave open
(1)
For Analog Section
For Analog Section
(2)
Do not connect, leave open
(1)
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
Page 9
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