S3026
SONET/SDH/ATM CLOCK RECOVERY UNIT
Table 1. S3026 Pin Assignment and Descriptions (Continued)
Pin Name
Level I/O
Pin # Description
LOCKDET
PECL
O
5
Lock Detect. Active High. When active, this output indicates that
the PLL is locked to the serial data inputs and valid clock and
data are present at the serial outputs. When inactive, it indicates
that the PLL is locked to the local reference clock. The lock
detect will go inactive under the following conditions:
1. If SDN is inactive.
2. If the VCO drifts away from the local reference clock by more
than 1000 ppm.
3. If LCKREFN is active.
4. If the serial data inputs contain insufficient run length (100 to
800 bit times). This only applies to the S3026A for OC-12
applications.
Lock detect will return to the active state if the serial clock is
within 250 ppm of the reference clock frequency.
DGND
DVCC
AGND
AVCC
GND
+5V
–
–
–
–
9
Digital Ground (0V)
10
Digital Power Supply (+5V)
Analog Ground (0V)
GND
+5V
4, 19
1, 20
Analog Power Supply (+5V)
October 18, 1999 / Revision G
5
AMCC [ APPLIED MICRO CIRCUITS CORPORATION ]
