XR-T7296 Datasheet, PDF (4/16 Pages) Exar Corporation – DS3/STS-1, E3 Integrated Line Transmitter

XR-T7296
PIN DESCRIPTION (CONT’D)
Pin #
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Symbol
BPV
RNRZ
RNEG
RPOS
RCLKO
DMO
MRING
MTIP
GNDA
TRING
TTIP
V_DDA
TXLEV
ICT
RPDATA
RNDATA
Type
O
O
O
O
O
O
I
I
O
O
-
I
I
I
I
Description
Bipolar Violation Output. This pin goes high for one bit period when a bipolar violation not
corresponding to the appropriate coding rule or coding error is detected in the RPDATA/
RNDATA signals.
Receive Binary Data. Signal on this pin is the ORed-output of RPOS and RNEG.
Receive Negative Data. This signal is the decoded version of RNDATA.¹
Receive Positive Data. This signal is the decoded version of RPDATA.¹
Receive Clock Output. This signal is the inverted version of RCLK.
Driver Monitor Output. If no transmitted AMI signal is present on MTIP and MRING for
128 $32 TCLK clock periods. DMO goes high until the next AMI signal is detected.
Monitor Ring Input. AMI signal from TRING can be connected to this pin for line driver fail-
ure detection. Internally pulled high.
Monitor Tip Input. AMI signal from TTIP can be connected to this pin for line driver failure
detection. Internally pulled high.
Analog Ground for analog circuitry.
Transmit Ring Output. Transmit AMI signal is driven to the line via a 1:1 transformer from
this pin.
Transmit Tip Output. Transmit AMI signal is driven to the line via a 1:1 transformer from this
pin.
5V Analog Supply ($5%) for analog circuitry.
Transmit Level Select. The output signal amplitude at TTIP and TRING can be varied by
setting this pin high or low. When the cable length is greater than 225 ft. TXLEV should be set
high. When it is below 225 ft, it should be set low. This pin is active only with pin 4 set to
DS3 or STS-1 mode.
In-circuit Testing. A low at this pin causes all digital and analog outputs to go into a high-im-
pedance state to allow for in-circuit testing. Internally pulled high.
Receive Positive Data. NRZ input data to the decoder block. Sampled on the falling edge of
RCLK.
Receive Negative Data. NRZ input data of the decoder block. Sampled on
falling edge of RCLK.
Note
1 _{If a bipolar violation occurs, RPOS and RNEG can correspond to the decoded versions of RNDATA and RPDATA respectively. If}
DECODIS is high, RPOS and RNEG always track RPDATA and RNDATA respectively.
Rev. 2.01
4