82P2821BH IDT, Integrated Device Technology Inc, 82P2821BH Datasheet - Page 64

• Manufacturer Part Number: 82P2821BH
• Manufacturer: IDT, Integrated Device Technology Inc

Specifications of 82P2821BH

• Number Of Transceivers: 1
• Screening Level: Industrial
• Mounting: Surface Mount
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Lead Free Status / RoHS Status: Not Compliant

IDT82P2821
21(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
Recovered clock of one
CLKB input
of the 22 channels
JA_BYPAS = 1 ?
Yes
No
Clock is derived from the
Clock is derived from the output
output of RJA
of Rx Clock & Data Recovery
selected by REFB[4:0]
Output on REFB
Figure-41 REFB Output Options in Normal Operation
In LLOS condition.
FS_BYPAS = 1 ?
Yes
No
Pass through a
Frequency Synthesizer.
FREE = 1 ?
REFH = 1 ?
Yes
Yes
No
REFH = 1 ?
No
No
Yes
Output on REFA is free
Output on REFA is free
running (locked to MCLK).
running (locked to MCLK).
Output high level.
The frequency is 1.544 MHz
The frequency is
in T1 mode or 2.048 MHz in
programmed in FREQ[2:0] *.
E1 mode.
Note *: '000' and '011' are reserved for FREQ[2:0] when REFA is free running.
Figure-42 REFA Output in LLOS Condition (When RCLKn Is Selected)
Functional Description
64
February 6, 2009