ICS843004I-04 Datasheet, PDF (2/14 Pages) Integrated Circuit Systems – FEMTOCLOCKS-TM CRYSTAL/LVCMOS-TO- 3.3V LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS843004I-04
FEMTOCLOCKS™ CRYSTAL/LVCMOS-TO-
3.3V LVPECL FREQUENCY SYNTHESIZER
TABLE 1. PIN DESCRIPTIONS
Number Name
Type
Description
1, 2
nQ1, Q1 Output
Differential output pair. LVPECL interface levels.
3, 22
4, 5
V_CCO
Q0, nQ0
Power
Ouput
Output supply pins.
Differential output pair. LVPECL interface levels.
Active HIGH Master Reset. When logic HIGH, the internal dividers are
6
MR
Input
Pulldown
reset causing the true outputs Qx to go low and the inverted outputs nQx
to go high. When logic LOW, the internal dividers and the outputs are
enabled. LVCMOS/LVTTL interface levels.
7,
F_SEL3,
10,
12,
F_SEL0,
F_SEL1,
Input
Pullup Frequency select pins. LVCMOS/LVTTL interface levels. See Table 3.
18
F_SEL2
8
nc
Unused
No connect.
9
11
13, 14
V_CCA
V_CC
XTAL_OUT,
XTAL_IN
Power
Power
Input
Analog supply pin.
Core supply pin.
Parallel resonant crystal interface. XTAL_OUT is the output,
XTAL_IN is the input.
15, 19
16
V_EE
Power
Negative supply pins.
CLK
Input Pulldown LVCMOS/LVTTL clock input.
17
20, 21
INPUT_SEL
nQ3, Q3
Input
Output
Selects between crystal or CLK inputs as the the PLL Reference source.
Pulldown Selects XTAL inputs when LOW. Selects CLK when HIGH.
LVCMOS/LVTTL interface levels.
Differential output pair. LVPECL interface levels.
23, 24 Q2, nQ2 Output
Differential output pair. LVPECL interface levels.
NOTE: Pulldown and Pullup refer to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
C_IN
R
PULLDOWN
R_PULLUP
Parameter
Input Capacitance
Input Pulldown Resistor
Input Pullup Resistor
Test Conditions
Minimum
Typical
4
51
51
Maximum
Units
pF
kΩ
kΩ
TABLE 3. OUTPUT CONFIGURATION AND FREQUENCY RANGE FUNCTION TABLE
Inputs
F_SELx XTAL (MHz)
0
19.44
1
19.44
0
18.75
VCO
(MHz)
622.08
622.08
600
Divider Value
÷1
÷4
÷1
Output Frequency (MHz)
Q0/nQ0:Q3/nQ3
622.08
155.52
600
1
18.75
600
÷4
150
0
19.53125
625
÷1
625
1
19.53125
625
÷4
156.25
0
20.141601 644.5312
÷1
644.5312
1
20.141601 644.5312
÷4
161.13
Application
SONET/SDH
SATA
10 Gigabit Ethernet
10 Gigabit Ethernet
66B/64B FEC
843004AGI-04
www.icst.com/products/hiperclocks.html
2
REV. A FEBRUARY 15, 2006