ICS843034-01 Datasheet, PDF (5/22 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ MULTI-RATE LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843034-01
FEMTOCLOCKS™
MULTI-RATE LVPECL FREQUENCY SYNTHESIZER
Number
Name
Type
Description
Parallel load input. Determines when data present at M5:M0 is
39
nP_LOAD
Input
Pulldown
loaded into M divider, and when data present at NA2:NA0 and
NB2:NB0 is loaded into the N output dividers.
LVCMOS/LVTTL interface levels.
40
VCO_SEL
Input
Pullup
Determines whether synthesizer is in PLL or bypass mode.
LVCMOS/LVTTL interface levels.
41, 42, 43,
44, 45, 47, 48
M0, M1, M2,
M3, M4, M6, M7
Input
Pulldown _{M divider inputs. Data latched on LOW-to-HIGH transition}
46
M5
Input Pullup ^{of nP_LOAD input. LVCMOS/LVTTL interface levels.}
NOTE: Pullup and Pulldown refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
C_IN
R
PULLUP
R_PULLDOWN
R_OUT
Parameter
Input Capacitance
Input Pullup Resistor
Input Pulldown Resistor
Output Impedance
Test Conditions
Minimum
5
Typical
4
51
51
7
Maximum
12
Units
pF
kΩ
kΩ
Ω
843034AY-01
www.icst.com/products/hiperclocks.html
5
REV. C NOVEMBER 28, 2005