ICS841654I Datasheet, PDF (3/17 Pages) Integrated Device Technology – FEMTOCLOCKS™ CRYSTAL-TO-HCSL CLOCK GENERATOR

ICS841654I
FEMTOCLOCKS™ CRYSTAL-TO-HCSL CLOCK GENERATOR
TABLE 3A. FSELX FUNCTION TABLE (f_ref = 25MHZ)
Inputs
Outputs Frequency Settings
FSEL1 FSEL0
M
QA0:1/nQA0:1
QB0:1/nQB0:1
0
0
20
VCO/5 (100MHz)
VCO/5 (100MHz) (default)
0
1
20
VCO/5 (100MHz)
VCO/4 (125MHz)
1
0
20
VCO/5 (100MHz)
QB0:1 = L, nQB0:1 = H
1
1
20
VCO/4 (125MHz)
VCO/4 (125MHz)
TABLE 3B. REF_SEL FUNCTION TABLE
Input
REF_SEL Input Reference
0
XTAL (default)
1
REF_IN
TABLE 3C. BYPASS FUNCTION TABLE
Input
BYPASS PLL Configuration ^{NOTE 1}
0
PLL on (default)
1
PLL bypassed (QA, QB = fref/N)
NOTE 1: Asynchronous function.
TABLE 3D. MR/nOE FUNCTION TABLE
Input
MR/nOE
Function^{NOTE 1}
0
Outputs enabled (default)
1
Device reset, outputs disabled (High Impedance)
NOTE 1: Asynchronous function.
TABLE 3E. nREF_OE FUNCTION TABLE
Input
nREF_OE Function^{NOTE 1}
0
REF_OUT enabled
1
REF_OUT disabled (High Impedance) (default)
NOTE 1: Asynchronous function.
IDT^™ / ICS^™ HCSL CLOCK GENERATOR
3
ICS841654AGI REV. A APRIL 17, 2008