78P2352 Dual Channel OC-3/STM1-E/E4 Line Interface Unit
ELECTRICAL SPECIFICATIONS (continued)
REFERENCE CLOCK CHARACTERISTICS:
PARAMETER
CKREF Duty Cycle
SYMBOL CONDITIONS
MIN
40
NOM
MAX
60
UNIT
%
--
Synchronous mode; E4
-15
-20
+15
+20
Synchronous mode; STM1
CKREF Frequency Stability
--
ppm
Plesiochronous or Loop-timing
mode. (see Note 1)
-75
+75
Note 1: In Plesiochronous mode, the transmit clock/data source (i.e. framer) must still be of +/-20ppm
quality (+/-15ppm for E4) in order to meet the SONET/SDH requirements.
RECEIVER TIMING CHARACTERISTICS:
PARAMETER
RCLK Duty Cycle
SYMBOL
TRCF/TRC
RSCQ
CONDITIONS
MIN
40
0
NOM
MAX
60
1
UNIT
%
Serial mode
Parallel mode
Clock to Q
ns
RPCQ
-1
2
TIMING DIAGRAM: Receive Waveforms
TRC = 6.43ns
TRCF = 3.215ns
SOxCKN
SOxCKP
SOxDP
SOxDN
TRCT
RSCQ
TRC = 25.72ns
TRCF = 12.86ns
POxCK
POxD<0:3>
RPCQ
TRCT
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TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
