PI6C39911-2J Pericom Semiconductor Corporation, PI6C39911-2J Datasheet - Page 7

• Manufacturer Part Number: PI6C39911-2J
• Description: 3.3V High Speed LVTTL or Balanced Output Programmable Skew Clock Buffer - SuperClock
• Manufacturer: Pericom Semiconductor Corporation

1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2
Operational Mode Descriptions
Figure 2 shows the SUPERCLOCK configured as a zero-skew clock
buffer. In this mode the PI6C39911 can be used as the basis for a low-
skew clock distribution tree. When all of the function select inputs
(xF0, xF1) are left open, the outputs are aligned and may each drive
a terminated transmission line to an independent load. The FB input
System Clock
System Clock
Figure 2. Zero-Skew and/or Zero-Delay Clock Driver
FB
REF
FS
4F0
4F1
3F0
3F1
2F0
2F1
1F0
1F1
TEST
Figure 3. Programmable Skew Clock Driver
FB
REF
FS
4F0
4F1
3F0
3F1
2F0
2F1
1F0
1F1
TEST
4Q0
4Q1
3Q0
3Q1
2Q0
2Q1
1Q0
1Q1
4Q0
4Q1
3Q0
3Q1
2Q0
2Q1
1Q0
1Q1
LENGTH: L1 = L2, L3 < L2 by 6", L4 > L2 by 6"
REF
7
REF
can be tied to any output in this configuration and the operating
frequency range is selected with the FS pin. The low-skew specifi-
cation, coupled with the ability to drive terminated transmission lines
(with impedances as low as 50 ohms), allows efficient printed circuit
board design.
Programmable Skew Clock Buffer - SuperClock
3.3V High Speed LVTTL or Balanced Output
LENGTH: L1 = L2 = L3 = L4
L1
L2
L3
L4
L1
L2
L3
L4
Z
Z
Z
Z
0
0
0
0
Z
Z
Z
Z
0
0
0
0
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
PS8497E
PI6C39911
09/13/02