DS21455 Maxim Integrated Products, DS21455 Datasheet - Page 82

• Manufacturer Part Number: DS21455
• Description: Network Controller & Processor ICs Quad E1-T1-J1 Single -Chip Transceiver (S
• Manufacturer: Maxim Integrated Products

Specifications of DS21455

• Product: Framer
• Number Of Transceivers: 4
• Data Rate: 64 Kbps
• Supply Voltage (max): 3.465 V
• Supply Voltage (min): 3.135 V
• Supply Current (max): 328 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Package / Case: BGA

Bit 3/Local Loopback (LLB). In this loopback, data will continue to be transmitted as normal through the transmit side of the
transceiver. Data being received at RTIP and RRING will be replaced with the data being transmitted. Data in this loopback
will pass through the jitter attenuator.
Bit 4/Line Interface Unit Mux Control (LIUC). This bit along with the LIUC/TPD pin and LBCR.7 controls the connection
between the LIU and the Framer. See the LTS (LBCR.7) description below. When the LIUC/TPD pin is connected high or
LBCR.7 = 1, the LIUC bit has control. When the LIUC/TPD pin is connected low the framer and LIU are separated and the
LIUC bit has no effect. For the DS21458 this bit should always be set = 0.
Table 14-1. LIUC Control
Bit 5/Unused, must be set to zero for proper operation.
Bit 6/Unused, must be set to zero for proper operation.
Bit 7/LIUC/TPD Pin Function Select (LTS). This bit selects the function the of the LIUC/TPD pin. On the DS21458, this
bit should always be set = 1.
LBCR.7
(LTS)
0
0
0
0
1
1
0 = loopback disabled
1 = loopback enabled
0 = LIUC/TPD pin functions as the LIUC control (This function is not available on the DS21458)
1 = LIUC/TPD pin functions as the TPD control
LIUC/TPD
PIN
0
0
1
1
x
x
RECEIVE
TRANSMIT
LIU
LIU
LBCR.4
(LIUC)
0
1
0
1
0
1
ATTENUATOR
ATTENUATOR
LIU and Framer Separated
TPOSI/TNEGI/TCLKI/RPOSI/RNEGI/RCLKI pins active
(This function not available on the DS21458)
LIU and Framer Separated
TPOSI/TNEGI/TCLKI/RPOSI/RNEGI/RCLKI pins active
(This function not available on the DS21458)
LIU and Framer Connected
TPOSI/TNEGI/TCLKI/RPOSI/RNEGI/RCLKI pins ignored
(This function not available on the DS21458)
LIU and Framer Separated
TPOSI/TNEGI/TCLKI/RPOSI/RNEGI/RCLKI pins active
(This function not available on the DS21458)
LIU and Framer Connected
TPOSI/TNEGI/TCLKI/RPOSI/RNEGI/RCLKI pins ignored
LIU and Framer Separated
TPOSI/TNEGI/TCLKI/RPOSI/RNEGI/RCLKI pins active
(This function not available on the DS21458)
JITTER
JITTER
LOCAL LOOPBACK
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FUNCTION
RECEIVE
FRAMER
TRANSMIT
FRAMER
BACKPLANE
BACKPLANE
I/F
I/F