DS21Q48 Maxim Integrated Products, DS21Q48 Datasheet
DS21Q48
Manufacturer Part Number
DS21Q48
Description
IC LIU E1/T1/J1 QUAD 5V 144-BGA
Manufacturer
Maxim Integrated Products
Type
Line Interface Units (LIUs)r
Specifications of DS21Q48
Protocol
E1
Voltage - Supply
4.75 V ~ 5.25 V
Mounting Type
Surface Mount
Package / Case
144-CSBGA
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Number Of Drivers/receivers
-
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The errata listed below describe situations where DS2148/DS21Q48 revision A2 components perform
differently than expected or differently than described in the data sheet. Maxim Integrated Products, Inc.,
intends to correct these errata in subsequent die revisions.
This errata sheet only applies to DS2148/DS21Q48 revision A2 components. Revision A2 components are
branded on the topside of the package with a six-digit code in the form yywwA2, where yy and ww are two-
digit numbers representing the year and work week of manufacture, respectively. To obtain an errata sheet
on another DS2148/DS21Q48 die revision, visit our website at www.maxim-ic.com/errata.
1) TRANSMIT OPEN-CIRCUIT DETECTION
2) RECEIVE LEVEL INDICATION
3) AUTOMATIC TRANSMIT UNFRAMED ALL ONES
__________________________________________________________ Revision A2 Errata
Rev: 091202
Description:
The transmit open-circuit detect bit (TOCD) in the status register should be set when the device detects
an open circuit at TTIP and TRING. The performance of this bit (SR.1) is unreliable, especially with
sparse data patterns when B8ZS is not used, and it is not tested.
Workaround:
None.
Description:
The DS2148 and DS21Q48 should report the signal strength in RTIP and RRING in 2.5dB steps
through the RL[3:0] bits in receive information register 2. The measurement of the receive level is
accurate to ±2 LSBs (i.e., ±5dB).
Workaround:
None.
Description:
When ATUA1 is enabled (CCR3.6 = 1), these devices do not automatically transmit an unframed all-
ones pattern at TTIP and TRING during a carrier loss (RCL) condition.
Workaround:
None.
__________________________________________
DS2148/DS21Q48
ERRATA SHEET
Maxim Integrated Products
1
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