VITESSE
SEMICONDUCTOR CORPORATION
Preliminary Datasheet
500 Mb/s Video
Shift Register IC
VSC6424
Package Pin Descriptions
Table 10: Package Pin Identification
Signal
Pin
I/O Level
Description
0V Ground Connection.
7, 9, 18, 30, 32, 44, 45,58, 59,
71, 72, 73, 82, 85, 94, 96, 108,
109, 122, 123
VCC
VTT
VTTL
3, 6, 13, 26, 33, 70, 77, 90, 97
-2V Supply Connection.
+3.3V Supply Connection
5, 8, 21, 31, 34, 48, 55, 69, 95,
98, 112, 119
VREF
4
-1.32V external ECL Reference voltage.
The 10 Demultiplexer High-Speed Inputs.
The 8 Multiplexer High-Speed Outputs.
101, 102, 103, 104, 105, 68, 67,
66, 65, 64
DIN<0:9>
DOUT<0:7>
I
ECL
ECL
86, 84, 83, 81, 80, 76, 75, 74
O
89, 91, 92, 93, 110, 111, 113,
114, 115, 116, 117, 118, 120,
121, 10, 11, 12, 14, 15, 16, 17,
19, 20, 22, 23, 24, 25, 27, 28,
29, 46, 47, 49, 50, 51, 52, 53,
54, 56, 57
Slow Bidirectional Bus. Multiplexer Input,
Demultiplexer Output.
SB<0:39>
B
TTL
MODE
62
I
I
TTL
TTL
Mux/DMux select signal. 1 for DMUX, 0 for MUX.
Address enable. In Mux mode, while AEN is low, the
clock transfers A<0:4> to DOUT<0,2,4,6,7>. In
DMUX mode it provides retimer input.
AEN
RETIME
100
CLK
CLKN
S<0:2>
60
61
I
I
I
ECL
ECL
TTL
Differential Clock Input (True)
Differential Clock Input (Complement)
Shift Register Modulus Control
39, 40, 41
Low Speed Clock. Clock used for latching the low
speed bus in internal timing mode.
CLKE
87
O
ECL
CLKT
88
O
I
TTL
TTL
Low Speed Clock. TTL version of above.
SP<0:2>
36, 37, 38
Phase select for output clocks (CLKE, CLKT)
Shift register load control. Used to transfer data from
input latch to shift register in external timing mode.
Data is transferred on the rising edge of CLK while
SLDN is low. In internal timing mode, SYNC is the
synchronization input.
SYNC
SLDN
106
I
TTL
Input latch control. In external timing mode, LLDN
low makes the low speed input latches transparent.
LLDN
SIN
43
42
I
I
TTL
ECL
Serial data in. The shift register can be serially loaded
using this pin. The data is latched on rising edge of
CLK. Connect to VTT if not used.
G52236-0, Rev 3.0
7/13/99
VITESSE SEMICONDUCTOR CORPORATION
Page 15
741 Calle Plano, Camarillo, CA 93012 • 805/388-3700 • FAX: 805/987-5896
VITESSE [ VITESSE SEMICONDUCTOR CORPORATION ]
