DS2155G Maxim Integrated Products, DS2155G Datasheet - Page 2

• Manufacturer Part Number: DS2155G
• Description: IC TXRX T1/E1/J1 1-CHIP 100CSBGA
• Manufacturer: Maxim Integrated Products

Specifications of DS2155G

• Function: Single-Chip Transceiver
• Interface: E1, HDLC, J1, T1
• Number Of Circuits: 1
• Voltage - Supply: 3.14 V ~ 3.47 V
• Current - Supply: 75mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 100-LFBGA
• Includes: BERT Generator and Detector, CMI Coder and Decoder, HDLC Controller
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Power (watts): -

3. TRANSMIT SA BIT SELECT (E1 MODE)
4. TRANSMIT FRACTIONAL SUPPORT
Description:
The 5 bits that control the Sa bits to be sourced from the TLINK pin are reversed from the order
described in the data sheet for the E1TCR2 register.
Work Around:
Use the Sa bit mappings as implemented in the DS2155 revision A3:
Description:
The transmit fractional support (alternate function of the TCHCLK pin) does not operate as described
in the data sheet. Transmit data at the TSER pin is sampled on the falling edge of TCLK. In fractional
support mode the TCHCLK pin should output a clock (gated version of TCLK) during a selected
channel or channels. The rising edge of this clock could be used to present data to the TSER pin for
sampling in the falling edge of TCLK. However, TCHCLK is delayed one- half clock in this rev of the
DS2155. Its rising edge occurs AFTER the sampling time of the corresponding bit time of TCLK, as
shown below.
Work Around:
There is no known software work around for this issue.
TCLK
TCHCLK
TCHCLK
E1TCR2
(Data Sheet)
E1TCR2
A3 rev
DATA SHEET
ACTUAL
Sa8S
Sa4S
Sa7S
Sa5S
Sa6S
Sa6S
SELECTED CHANNEL
Sa5S
Sa7S
2 of 7
Sa4S
Sa8S
AEBE
AEBE
AAIS
AAIS
DS2155 ERRATA SHEET
ARA
ARA