PI6C20400
1:4 Clock Driver for Intel
PCI Express Chipsets
Features
• Four Pairs of Differential Clocks
• Low skew < 50ps
• Low jitter < 50ps
• Output Enable for all outputs
• Outputs tristate control via SMBus
• Power Management Control
• Programmable PLL Bandwidth
• PLL or Fanout operation
• 3.3V Operation
• Packaging:
- 28-Pin SSOP (H) & 28-Pin TSSOP (L)
- Pb-Free and Green Option (HE and LE)
Description
Pericom Semiconductors PI6C20400 is a high-speed, low-noise
differential clock buffer designed to be companion to PI6C410B.
The device distributes the differential SRC clock from PI6C410B
to four differential pairs of clock outputs either with or without
PLL. The clock outputs are controlled by input selection of
SRC_STOP#, PWRDWN# and SMBus, SCLK and SDA. When
input of either SRC_STOP# or PWRDWN# is low, the output
clocks are Tristated. When PWRDWN# is low, the SDA and
SCLK inputs must be Tristated.
Block Diagram
OE_INV
OE_0 & OE_3
SRC_STOP#
PWRDWN#
SCLK
SDA
PLL/BYPASS#
SRC
SRC#
Output
Control
Pin Configuration
V
DD
SRC
SCR#
V
SS
V
DD
OUT0
OUT0#
OE_0
OUT1
OUT1#
V
DD
PLL/BYPASS#
SCLK
SDA
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
OUT0
OUT0#
OUT0
OUT1#
OUT2
OUT2#
OUT3
OUT3#
SMBus
Controller
PLL_BW#
PLL
DIV
V
DD_A
V
SS_A
I
REF
OE_INV
V
DD
OUT3
OUT3#
OE_3
OUT2
OUT2#
V
DD
PLL_BW#
SRC_STOP#
PWRDWN#
1
PS8744A
06/23/05
PERICOM [ PERICOM SEMICONDUCTOR CORPORATION ]
