VITESSE
SEMICONDUCTOR CORPORATION
Data Sheet
2.48832Gb/s 16:1 SONET/SDH
Transceiver with Integrated Clock Generator
VSC8140
Package Pin Descriptions
Table 4: Package Pin Identification - 128 PQFP
Pin #
Name
I/O
Level
Description
1
OVERFLOW
VEET
O
—
—
—
I
TTL
FIFO overflow indication
2
GND typ. TTL VEE power supply
3
VCCT
+3.3V typ. TTL VCC power supply
4
VEE
GND typ. Negative power supply
5
HSDREF
VEE
0V->3.3V High-speed data input termination voltage reference
GND typ. Negative power supply
6
—
I
7
RXIN+
RXIN-
HS
HS
High-speed data input, true
High-speed data input, complement
Positive power supply
8
I
9
VCC
—
—
—
—
I
3.3V typ.
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
VEE
GND typ. Negative power supply
GND typ. Negative power supply
VEE
VCC
3.3V typ.
HS
Positive power supply
RXCLKIN-
HSCLKREF
RXCLKIN+
VCC
High-speed clock input, complement
I
0V->3.3V High-speed clock input termination voltage reference
I
HS
3.3V typ.
—
High-speed clock Input, true
Positive power supply
No connect, leave unconnected(1)
—
—
—
—
O
NC
VCC
3.3V typ.
3.3V typ.
HS
Positive power supply
VCC
Positive power supply
TXOUT+
TXOUT-
VCC
High-speed data output, true
High-speed data output, complement
Positive power supply
O
HS
—
—
—
—
—
—
O
3.3V typ.
VEE
GND typ. Negative power supply
GND typ. Negative power supply
GND typ. Negative power supply
VEE
VEE
VCC
3.3V typ.
3.3V typ.
HS
Positive power supply
VCC
Positive power supply
TXCLKOUT+
TXCLKOUT-
VCC
High-speed clock output, true
High-speed clock output, complement
Positive power supply
O
HS
—
—
—
I
3.3V typ.
VEEP_CLK
VEEP_CLK
VEE_PWRDN
VCC
GND typ. HS clock VEE power supply (tie to VCC for power down)
GND typ. HS clock VEE power supply (tie to VCC for power down)
GND typ. HS clock VEE power supply (tie to VCC for power down)
—
—
—
3.3V typ.
3.3V typ.
3.3V typ.
Positive power supply
Positive power supply
Positive power supply
VCC
VCC
G52251-0, Rev. 4.0
9/6/00
VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
Page 19
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