XRT91L82ES Exar, XRT91L82ES Datasheet - Page 25

• Manufacturer Part Number: XRT91L82ES
• Description: Bus Transceivers Transceiver
• Manufacturer: Exar

Specifications of XRT91L82ES

• Product Category: Bus Transceivers
• Rohs: yes

xr
xr
REV. P1.0.5
When operating the 16-bit Differential bus in LVDS mode, a 402
and XRES1N to properly bias the RXDO[15:0]P/N and RXPCLKOP/N pins. Figure 8 shows the proper biasing
resistor installed.
The parallel receiver data outputs are automatically pulled "Low" during a LOSD condition to prevent data
chattering. However, the user must select the proper SDEXT polarity for the optical module used. In addition,
by pulling DISRD "Low", the receiver data outputs will be muted asynchronously or forced to a logic state of "0"
regardless of the data input stream.
Like DISRD, DISRDCLK is used to mute the parallel receiver clock output RXPCLKOP/N regardless of the
data input stream. By pulling DISRDCLK "Low", the receiver clock output will be asynchronously muted
whenever desired.
The receive parallel data output from the STS-48/STM-16 receiver will adhere to the setup and hold times
shown in Figure 9 and Table 7.
F
xr
xr
F
2.7
2.8
2.9
2.10
IGURE
IGURE
t
t
S
RX
RXPCLKO
RXPCLKO
t
t
RX_DEL
RX_INV
YMBOL
DUTY
9. R
8. LVDS
Receive Parallel Interface LVDS Operation
Parallel Receive Data Output Disable/Mute Upon LOSD
Parallel Receive Clock Output Disable
Receive Parallel Data Output Timing
RXDO[15:0]P/N
RXPCLKOP/N
ECEIVE
Receive parallel clock output period (155.52 MHz non-FEC rate)
Receive parallel clock output period (166.63 MHz FEC rate)
RXPCLKOP/N "Low" to data invalid window
RXPCLKOP/N "Low" to data delay
RXPCLKOP/N Duty Cycle
T
ABLE
EXTERNAL BIASING RESISTORS
P
ARALLEL
7: R
ECEIVE
O
t
RX_INV
UTPUT
pin E14
P
t
RX_DEL
ARALLEL
T
IMING
P
XRES1P
ARAMETER
2.488/2.666 GBPS STS-48/STM-16 SONET/SDH TRANSCEIVER
PRELIMINARY
D
ATA AND
+/- 1 % tolerance
402
SAMPLE WINDOW
22
C
LOCK
t
RX_INV
XRES1N
t
RXPCLKO
O
UTPUT
external resistor is needed across XRES1P
T
pin F14
IMING
S
PECIFICATIONS
M
45
t
RX_DEL
IN
6.43
6.00
T
YP
1000
M
900
55
XRT91L82
AX
U
NITS
ns
ns
ps
ps
%