ICS841664I Datasheet, PDF (3/16 Pages) Integrated Device Technology – FEMTOCLOCK™ CRYSTAL-TO-HCSL CLOCK GENERATOR

ICS841664I
FEMTOCLOCK™ CRYSTAL-TO-HCSL CLOCK GENERATOR
PRELIMINARY
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
25
VCO/5 (125MHz)
VCO/5 (125MHz)
0
1
25
VCO/5 (125MHz)
VCO/4 (156.25MHz)
1
0
25
VCO/5 (125MHz) QB0:1 = L, nQB0:1 = H
1
1
25
VCO/4 (156.25MHz) VCO/4 (156.25MHz)
TABLE 3B. REF_SEL FUNCTION TABLE
Input
REF_SEL Input Reference
0
XTAL
1
REF_IN
TABLE 3D. MR/nOE FUNCTION TABLE
Input
MR/nOE
Function^{NOTE 1}
0
Outputs enabled
1
Device reset, outputs disabled (Low)
NOTE 1: Asynchr. function (may cause output glitch).
TABLE 3C. BYPASS FUNCTION TABLE
Input
BYPASS PLL Configuration
0
PLL on
1
PLL bypassed (QA, QB = fref/N)
NOTE 1: Asynchr. function (may cause output glitch).
TABLE 3E. nREF_OE FUNCTION TABLE
Input
nREF_OE Function^{NOTE 1}
0
REF_OUT enabled
1
REF_OUT disabled (high impedance)
NOTE 1: Asynchr. function (may cause output glitch).
IDT^™ / ICS^™ HCSL CLOCK GENERATOR
3
ICS841664AGI REV. A JANUARY 30, 2009