DS3251+ Maxim Integrated Products, DS3251+ Datasheet - Page 17

• Manufacturer Part Number: DS3251+
• Description: IC LIU DS3/E3/STS-1 144-CSBGA
• Manufacturer: Maxim Integrated Products
• Type: Line Interface Units (LIUs)r

Specifications of DS3251+

• Number Of Drivers/receivers: 1/1
• Protocol: DS3
• Voltage - Supply: 3.135 V ~ 3.465 V
• Mounting Type: Surface Mount
• Package / Case: 144-CSBGA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Name
Register Name:
Register Description:
Register Address:
Bit
Default
Bits 7 and 0: Jitter Attenuator Buffer Length (JAL[1:0])
These lengths are the total size of the buffer. The jitter attenuator control logic seeks to keep the read and write
pointers half a buffer apart. Therefore typical latency through the jitter attenuator is half the buffer length.
Bit 6: Transmitter Binary Interface Enable (TBIN)
Bit 5: Transmitter Clock Invert (TCINV)
Bit 4: Transmitter Jitter Attenuator Enable (TJA)
Bit 3: Transmitter Power-Down Enable (TPD)
Bit 2: Transmitter Tri-State Enable (TTS). This bit is set to 1 on reset, which tri-states the transmitter TXP and
TXN pins. The transmitter circuitry is left powered up in this mode. The TTS input pin is inverted and logically ORed
with this bit.
Bit 1: Transmitter Line Build-Out (TLBO). TLBO indicates cable length for waveform shaping in DS3 and STS-1
modes. TLBO is ignored in E3 mode.
00 = 16 bits
01 = 32 bits
10 = 64 bits
11 = 128 bits
0 = Transmitter framer interface is bipolar on the TPOS and TNEG pins. The B3ZS/HDB3 encoder is
1 = Transmitter framer interface is binary on the TDAT pin. The B3ZS/HDB3 encoder is enabled.
0 = TPOS/TDAT and TNEG are sampled on the rising edge of TCLK.
1 = TPOS/TDAT and TNEG are sampled on the falling edge of TCLK.
0 = Remove jitter attenuator from the transmitter path.
1 = Insert jitter attenuator into the transmitter path.
0 = enable the transmitter
1 = power-down the transmitter (output driver tri-stated)
0 = enable the transmitter output driver
1 = tri-state the transmitter output driver
0 = cable length ≥ 225ft
1 = cable length < 225ft
JAL[1]
7
0
disabled.
TBIN
6
0
TCRn
Transmitter Configuration Register
01h, 11h, 21h, 31h
TCINV
5
0
TJA
4
0
17 of 71
TPD
3
0
TTS
2
1
TLBO
1
0
JAL[0]
0
0