4©2016 Integrated Device Technology, Inc Revision C January 27, 2016
894D115I-04 Data Sheet
Table 3. Pin Characteristics
Function Tables
Table 4A. LOCK_DET Operation Table
Table 4B. STS12 Mode Configuration Table
Table 4C. LOCK_REFN Mode Configuration Table
Table 4D. SD Mode Configuration Table
Symbol Parameter Test Conditions Minimum Typical Maximum Units
C
IN
Input Capacitance 4 pF
R
PULLUP
Input Pullup Resistor 51 k
R
PULLDOWN
Input Pulldown Resistor 51 k
Operation
Output
LOCK_DET
The PLL is not locked to the serial input data stream if any of these three conditions occur:
A. Internal oscillator and REF_CLK input frequency are not within 500ppm of each other.
B. SD input is at logic LOW state.
C. LOCK_REFN is at logic LOW state.
LOW
When the PLL is locked to the serial input data stream, the CLK_OUT and DATA_OUT signals are valid. HIGH
Input
OperationSTS12
0
STM-1 (OC-3, STS-3) operation. The clock/data recovery circuit attempts to recover the clock from a 155.52 Mbit/s
input data stream. The output clock frequency is 155.52MHz.
1
STM-4 (OC-12, STS-12) operation. The clock/data recovery circuit attempts to recover the clock from a 622.08 Mbit/s
input data stream. The output clock frequency is 622.08MHz.
Input
OperationLOCK_REFN
0
Lock to reference clock. CLK_OUT/nCLK_OUT output frequency is within ±500ppm of the reference clock
(REF_CLK). DATA_OUT is set to logic LOW state and nDATA_OUT is set to logic HIGH state. (DATA_OUT = L,
nDATA_OUT = H).
1 Normal operation.
Input
OperationSD
0
Indicates a loss-of-signal (LOS) condition to the device. CLK_OUT/nCLK_OUT output frequency is within ±500ppm
of the reference clock (REF_CLK). DATA_OUT is set to logic LOW state and nDATA_OUT is set to logic HIGH state.
(DATA_OUT = L, nDATA_OUT = H).
1 Normal operation.
