STC5455 Datasheet, PDF (11/56 Pages) Connor-Winfield Corporation – Synchronous Clock for SETS

Input and Output Frequencies
STC5455
Synchronous Clock for SETS
Data sheet
Input Frequencies
Auto-Detect Acceptable Input Frequencies
The STC5455 can automatically detect the frequency of the reference input when the user enable the auto-
detect function at the register Ref Index Selector and Ref Acceptable Freq for REF1~REF5 individually. The
acceptable frequency for auto detection is shown in Table 4.
Table 4: Auto-Detect Acceptable Ref Input Frequencies
Reference Input
REF1 ~ REF5
EX_SYNC 1
EX_SYNC 2
EX_SYNC 3
Frequency
8 kHz
64 kHz
19.44 MHz
38.88 MHz
77.76 MHz
1.544 MHz
2.048 MHz
6.48 MHz
8.192 MHz
16.384 MHz
25 MHz
50 MHz
125 MHz
2kHz or 8kHz external frame sync inputs
Manually Acceptable Input Frequencies
When the frequency auto-detect function is disabled, STC5455 provides another option which allows the user
to select the manually acceptable reference frequency for REF1~REF5 individually, at the integer multiple of
8kHz (Nx8kHz, N is integer from 1 to 32767). Hence the manually acceptable reference frequency range is
8kHz to 262.136MHz, in 8kHz steps. When a manually acceptable reference frequency is used, the user need
to access the register Ref Acceptable Freq to set the integer N for associated reference input selected at the
register Ref Index Selector.
Input Frequency = N x 8kHz, where N = 1~32767
Preliminary
Page 11 of 56 TM121
Rev:P1.3
© Copyright the Connor-Winfield Corp. All Rights Reserved Specifications subject to change without notice
Date: October 24, 2011