si5540 Silicon Laboratories, si5540 Datasheet - Page 15

• Manufacturer Part Number: si5540
• Description: Siphy Oc-192/stm-64 Transmitter - Silicon Laboratories
• Manufacturer: Silicon Laboratories

D3, E3, F3, G3,
Pin Number(s)
G9–10, H9–10,
A7–10, B5–10,
C9–10, D9–10,
E9–10, F9–10,
J5–10, K7–10
A3, B2
C1, D1
F1, G1
K5–6
K3–4
B4
J1
J3
J2
TXCLK16OUT+,
TXCLK16OUT–
RSVD_VDD33
TXDIN[15:0]–,
TXCLK16IN–,
TXCLKOUT+,
TXDIN[15:0]+
TXCLK16IN+
TXCLKDSBL
TXCLKOUT–
RSVD_GND
TXDOUT+,
TXDOUT–
Pin Name
TXLOL
REXT
I/O
—
—
O
O
O
O
I
I
I
Preliminary Rev. 0.31
Signal Level
LVTTL
LVTTL
LVDS
LVDS
LVDS
CML
CML
External Bias Resistor.
This resistor is used by onboard circuitry to
establish bias currents within the device. This
pin must be connected to GND through a
3.09 k
Reserved Tie to Ground.
Must tie directly to GND for proper operation.
Reserved Tie to VDD33.
Must tie directly to VDD33 for proper operation.
Differential Data Clock Input.
The rising edge of this input clocks data present
on TXDIN into the device.
Divided Down Output Clock.
This clock output is generated by dividing down
the high speed output clock, TXCLKOUT, by a
factor of 16. It is intended for use in counter
clocking schemes that transfer data between
the system ASIC and the Si5540.
High Speed Clock Disable.
When this input is high, the output driver for
TXCLKOUT is disabled. In applications that do
not require the output data clock, the output
clock driver should be disabled to save power.
High Speed Clock Output.
The high speed output clock, TXCLKOUT, is
generated by the PLL in the clock multiplier
unit. It’s frequency is nominally 16 or 64 times
the selected reference source.
Differential Parallel Data Input.
The 16-bit data word present on these pins is
multiplexed into a high speed serial stream and
output on TXDOUT. The data on these inputs is
clocked into the device by the rising edge of
TXCLKIN.
Differential High Speed Data Output.
The 16-bit word input on TXDIN[15:0] is multi-
plexed into a high speed serial stream that is
output on these pins. This output is updated by
the rising edge of TXCLKOUT.
CMU Loss-of-Lock.
The output is asserted low when the CMU is not
phase locked to the selected reference source.
1
resistor.
Description
Si5540
15