XR-T7296 Datasheet, PDF (3/16 Pages) Exar Corporation – DS3/STS-1, E3 Integrated Line Transmitter

PIN CONFIGURATION
RCLK 1
RLOOP ²
LLOOP ³
DS3,STS-1/E3 ⁴
TAOS ⁵
V_DDD ⁶
TPDATA ⁷
TNDATA 8
TCLK 9
GNDD 10
ENCODIS ₁₁
DECODIS 12
BPV 13
RNRZ ¹⁴
28 _RNDATA
27 _RPDATA
26 _ICT
25 _TXLEV
24 _VDDA
23 _TTIP
22 _TRING
21 GNDA
20 MTIP
19 MRING
18 ^DMO
17 RCLKO
16 RPOS
15 _RNEG
28 Lead PDIP (0.600”)
XR-T7296
RCLK
RLOOP
LLOOP
DS3,STS-1/E3
TAOS
V_DDD
TPDATA
TNDATA
TCLK
GNDD
ENCODIS
DECODIS
BPV
RNRZ
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
RNDATA
RPDATA
ICT
TXLEV
V_DDA
TTIP
TRING
GNDA
MTIP
MRING
DMO
RCLKO
RPOS
RNEG
28 Lead SOJ (Jedec, 0.300”)
PIN DESCRIPTION
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
Symbol
CLK
RLOOP
LLOOP
DS3,STS-1/
E3
TAOS
V_DDD
TPDATA
TNDATA
TCLK
GNDD
ENCODIS
DECODIS
Type
I
I
I
I
I
I
I
I
I
I
Description
Receive Clock Input. Input sampling clock for RPDATA and RNDATA.
Remote Loop Back. A high on this pin causes RPDATA and RNDATA to transmitted to the
line using RCLK. Setting RLOOP and LLOOP high simultaneously is not permitted.
Local Loop Back. A high on this pin causes TPDATA and TNDATA to pass through the en-
coder and output at RPOS and RNEG respectively. Setting LLOOP and RLOOP high simulta-
neously is not permitted.
DS3, STS-1 or E3 Select Pin. A high on this pin selects DS3 or STS-1 operation and sets the
encoder and decoder in B3ZS mode. A low selects E3 and sets the encoder and decoder in
HDB3 mode.
Transmit All Ones Select. A high on this pin causes a continuous AMI all 1’s pattern to be
transmitted to the line. The frequency is determined by TCLK.
5 V Digital Supply ($5%) for all logic circuitry.
Transmit Positive Data. TPDATA is sampled on the falling edge of TCLK. Pin 7 and pin 8
can be tied together for binary input signals.
Transmit Negative Data. TNDATA is sampled on the falling edge of TCLK. Pin 7 and pin 8
can be tied together for binary input signals.
Transmit Clock for TPDATA and TNDATA.
Digital Ground for all logic circuitry.
Encoder Disable. A high on this pin disables B3ZS or HDB3 encoding functions, unless over-
ridden by TAOS request. This pin must be set high if TPDATA and TNDATA are already en-
coded.
Decoder Disable. A high on this pin disables B3ZS or HDB3 decoding functions.
Rev. 2.01
3