XRT91L80ES Exar, XRT91L80ES Datasheet - Page 19

• Manufacturer Part Number: XRT91L80ES
• Description: Bus Transceivers Transceiver
• Manufacturer: Exar

Specifications of XRT91L80ES

• Product Category: Bus Transceivers
• Rohs: yes

xr
xr
REV. 1.0.0
When operating the 4-bit Differential bus in LVDS mode, a 402
and XRES1N to properly bias the RXDO[3:0]P/N and RXPCLKOP/N pins. Figure 7 shows the proper biasing
resistor installed.
The parallel receiver data outputs can be automatically forced "Low" during an LOSD condition to prevent data
chattering. However, the user must select the proper SDEXT polarity for the optical module used. By asserting
LOSDMUTE "High", the parallel receiver data outputs will be forced "Low" any time an LOSD condition occurs.
Unlike LOSDMUTE, DISRD is used to asynchronously force the parallel receiver data outputs to zero,
regardless of the data input stream. By asserting DISRD "High", the parallel receiver data outputs will
immediately mute.
The receive parallel data output from the STS-48/STM-16 receiver will adhere to the setup and hold times
shown in Figure 8 and Table 5.
F
xr
xr
F
2.6
2.7
2.8
2.9
IGURE
IGURE
t
t
RX
S
RXPCLKO
RXPCLKO
t
t
RX_DEL
RX_INV
YMBOL
DUTY
8. R
7. LVDS
Receive Parallel Interface LVDS Operation
Parallel Receive Data Output Mute Upon LOSD
Parallel Receive Data Output Disable
Receive Parallel Data Output Timing
RXDO[3:0]P/N
RXPCLKOP/N
ECEIVE
Receive parallel clock output period (622.08 MHz non-FEC rate)
Receive parallel clock output period (666.51 MHz FEC rate)
RXPCLKOP/N "High" to data invalid window
RXPCLKOP/N "High" to data delay
RXPCLKOP/N Duty Cycle
T
ABLE
EXTERNAL BIASING RESISTORS
P
ARALLEL
5: R
ECEIVE
O
t
RX_INV
UTPUT
pin G1
P
t
RX_DEL
ARALLEL
T
IMING
P
XRES1P
ARAMETER
2.488/2.666 GBPS STS-48/STM-16 SONET/SDH TRANSCEIVER
D
ATA AND
+/- 1 % tolerance
402
SAMPLE WINDOW
17
C
LOCK
t
RX_INV
XRES1N
t
RXPCLKO
O
UTPUT
external resistor is needed across XRES1P
T
pin F1
IMING
S
PECIFICATIONS
M
45
t
IN
RX_DEL
1608
1500
T
50
50
50
YP
M
300
300
55
XRT91L80
AX
U
NITS
ps
ps
ps
ps
%