DS2155G Maxim Integrated Products, DS2155G Datasheet - Page 3

• 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): -

5. RECEIVE FRACTIONAL SUPPORT
6. HDLC FIFO
7. HDLC TIMING
Description:
The receive fractional support (alternate function of the RCHCLK pin) does not operate as described
in the data sheet. Receive data at the RSER pin is updated on the rising edge of RCLK. In fractional
support mode the RCHCLK pin should output a clock (gated version of RCLK) during a selected
channel or channels. The falling edge of this clock could be used by the backplane to sample data
output on the RSER pin. However, RCHCLK is delayed one half clock in this rev of the DS2155.
Work Around:
As an alternate method, the backplane can use the rising edge RCHCLK to sample data output form
RSER.
Description:
HDLC FIFOs cannot be read from or written to at full bus speed. Writing at a speed >4.7MHz can
cause data corruption in the FIFOs.
Work Around:
Keep the HDLC read and write speed below 4.7MHz.
Description:
While in framer loopback mode, received HDLC data can be corrupted when MCLK and TCLK
rising edges are <30ns apart. When not in framer loopback mode, data can be corrupted if the edges
of RCLK and the internally generated 8XCLK occur simultaneously.
Work Around:
Separate the rising edges of MCLK and TCLK by more than 30ns when in framer loopback. When
not in framer loopback mode, placing the jitter attenuator in the receive path (LIC1 = 00h) phase-
locks the 8XCLK with RCLK and avoids data corruption.
RCLK
RCHCLK
RCHCLK
DATA SHEET
ACTUAL
SELECTED CHANNEL
3 of 7
DS2155 ERRATA SHEET