SI5110 Silicon Storage Technology Inc, SI5110 Datasheet - Page 22

• Manufacturer Part Number: SI5110
• Description: SiPHY OC-48/STM-16 SONET/SDH TRANSCEIVER
• Manufacturer: Silicon Storage Technology Inc

Si 5110
D4–7, E4–6,
22
G9–10, H9–
F4–6, G4–7
Number(s)
10, J9–10,
K9–10
H1, J1
Pin
G2
K4
H4
K3
B4
J6
TXMSBSEL
TXDIN[3:0],
TXDIN[3:0]
TXSQLCH
TXDOUT,
TXDOUT
TXREXT
TXLOL
VDD33
Name
VREF
VDD
VDD33
VDD
I/O
O
O
O
I
I
I
1.8 V or 3.3 V Digital Output Supply.
Signal Level
Voltage Ref
Preliminary Rev. 0.41
LVTTL
LVTTL
LVTTL
LVDS
1.8 V
CML
Differential Parallel Data Input.
The 4-bit data word present on these pins is multi-
plexed 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 TXCLK4IN.
Differential High Speed Data Output.
The 4-bit word input on TXDIN[3:0] is multiplexed into
a high speed serial stream that is output on these
pins. Input data is multiplexed in sequence from
TXDIN0 to TXDIN3 with TXDIN0 transmitted first. 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.
Data Bus Transmit Order.
For TXMSBSEL = 0, data on TXDIN[0] is transmitted
first followed by TXDIN[1] through TXDIN[3].
For TXMSBSEL = 1, TXDIN[3] is transmitted first fol-
lowed by TXDIN[2] through TXDIN[0].
External Bias Resistor.
This resistor is used by the transmitter circuitry to
establish bias currents within the device. This pin must
be connected to GND through a 3.09 k
Transmit Data Squelch.
If TXSQLCH is asserted low, the output data stream
on TXDOUT will be forced to 0s. If TXSQLCH = 1, TX
squelching is turned off.
Supply Voltage.
Nominally 1.8 V.
Must be tied to either 1.8 V or 3.3 V. When tied to
3.3 V, LVTTL compatible output voltage swings on
RXLOL, LOS, TXLOL, and FIFOERR are supported.
Voltage Reference.
The Si5110 provides an output voltage reference that
can be used by an external circuit to set the LOS
threshold, slicing level, or sampling phase adjustment.
The equivalent resistance between this pin and GND
should not be less than 10 k . The reference voltage
is nominally 1.25 V.
Description
1
resistor.