SL28PCIe25
DOC#: SP-AP-0776 (Rev. 0.2)
Page 2 of 16
32-QFN Pin Definitions
EProClock Programmable Technology
EProClock is the world’s first non-volatile programmable
clock. The EProClock technology allows board designer to
promptly achieve optimum compliance and clock signal
integrity; historically, attainable typically through device and/or
board redesigns.
EProClock technology can be configured through SMBus or
hard coded.
Features:
- > 4000 bits of configurations
- Can be configured through SMBus or hard coded
- Custom frequency sets
- Differential skew control on true or compliment or both
- Differential duty cycle control on true or compliment or both
- Differential amplitude control
- Differential and single-ended slew rate control
- Program Internal or External series resistor on single-ended
clocks
- Program different spread profiles and modulation rates
Serial Data Interface
To enhance the flexibility and function of the clock synthesizer,
a two-signal serial interface is provided. Through the Serial
Pin No.
Name
Type
Description
1
VDD
PWR 3.3V Power Supply
2
VSS
GND
Ground
3
NC
No Connect.
4
NC
No Connect.
5
VDD
PWR 3.3V Power Supply
6
NC
No Connect.
7
NC
No Connect.
8
VSS
GND
Ground
9
VSS
GND
Ground
10
SRC0
O, DIF 100MHz True differential serial reference clock
11
SRC0#
O, DIF 100MHz Complement differential serial reference clock
12
VSS
GND
Ground
13
SRC1
O, DIF 100MHz True differential serial reference clock
14
SRC1#
O, DIF 100MHz Complement differential serial reference clock
15
VDD
PWR 3.3V Power Supply
16
NC
No Connect.
17
VDD
PWR 3.3V Power Supply
18
VDD
PWR 3.3V Power Supply
19
SRC2#
O, DIF 100MHz Complement differential serial reference clock
20
SRC2
O, DIF 100MHz True differential serial reference clock
21
VSS
GND
Ground
22
SRC3#
O, DIF 100MHz Complement differential serial reference clock
23
SRC3
O, DIF 100MHz True differential serial reference clock
24
VDD
PWR 3.3V Power Supply
25
CKPWRGD/PD#
I
3.3V LVTTL input pin. When PD# is asserted low, the device will power down.
26
VSS
GND
Ground
27
XOUT
O, SE 25MHz Crystal output, Float XOUT if using CLKIN (Clock Input)
28
XIN/CLKIN
I
25MHz Crystal input or 3.3V, 25MHz Clock input
29
VDD
PWR 3.3V Power Supply
30
REF
O
3.3V, 25MHz clock output.
31
SDATA
I/O
SMBus compatible SDATA
32
SCLK
I
SMBus compatible SCLOCK