VITESSE
SEMICONDUCTOR CORPORATION
Datasheet
2.488 Gb/s ATM/SDH/SONET STM-16/STS-48
Mux/Demux and Section Terminator IC Chipset
VSC8025/VSC8026
Table 9: Pin Identification Table
Signal
Pin
I/O
Level
Pin Description
TXPCLKIN+
DISSCRM
VTT
F02
F03
F04
F13
F14
F15
F16
I
ECL
TTL
-2V
Transmit parallel clock in
Disable scrambler (active high)
-2.0V power supply
I
PWR
VTT
PWR
-2V
-2.0V power supply
TXINC2
TXINC0
TEST 24
I
I
TTL
TTL
TTL
Parallel input bus data C
Parallel input bus data C
Test pin (leave open)
O
Transmit clock termination. If AC coupling, connect to
GND with a decoupling capacitor. If DC coupling,
connect to Vtt directly.
TXCLKREF
G01
VCC
VTTL
G02
G03
G04
G13
G14
G15
G16
H01
H02
H03
H04
H13
H14
H15
H16
J01
PWR
PWR
PWR
PWR
PWR
PWR
O
GND
+3.3V
GND
GND
+3.3V
GND
TTL
Ground
+3.3V power supply
Ground
VCC
VCC
Ground
VTTL
+3.3V power supply
Ground
VCC
TXCLK12A
TXCLK-
TXCLK+
VGND
VTT
Transmit clock divided by 32
Transmit clock from CMU
Transmit clock from CMU
Ground
I
HSECL
HSECL
GND
-2V
I
PWR
PWR
PWR
PWR
I
-2.0V power supply
-2.0V power supply
Ground
VTT
-2V
VCC
GND
TTL
TFALL
TXCLKIN
TXSOUT+
TXSOUT-
VCC
Contra/Co-directional programming pin
Parallel input data load clock
High-speed serial data out
High-speed serial data out
Ground
I
TTL
O
HSECL
HSECL
GND
-2V
J02
O
J03
PWR
PWR
PWR
PWR
I
VTT
J04
-2.0V power supply
-2.0V power supply
Ground
VTT
J13
-2V
VCC
J14
GND
TTL
TXINB7
TRISE
TXSCLKOUT+
VCC
J15
Parallel input bus data B
Contra/Co-directional programming pin
High-speed serial clock out
Ground
J16
I
TTL
K01
K02
K03
K04
K13
O
HSECL
GND
+3.3V
GND
GND
PWR
PWR
PWR
PWR
VTTL
+3.3V power supply
Ground
VCC
VCC
Ground
G52182-0, Rev. 4.0
1/5/00
VITESSE SEMICONDUCTOR CORPORATION
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
Page 15
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