ICS843004-02 Datasheet, PDF (2/12 Pages) Integrated Circuit Systems – CRYSTAL-TO-3.3V LVPECL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843004-02
CRYSTAL-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.
Selects between the PLL and TEST_CLK as input to the dividers. When
7
nPLL_SEL Input Pulldown LOW, selects PLL (PLL Enable). When HIGH, deselects the reference clock
(PLL Bypass). LVCMOS/LVTTL interface levels.
8, 9
nc
Unused
No connect.
10
V_CCA
Power
Analog supply pin.
11,
19
F_SEL0,
F_SEL2
Input
Pullup Frequency select pins. LVCMOS/LVTTL interface levels.
12
V_CC
Power
Core supply pin.
13
F_SEL1 Input Pulldown Frequency select pins. LVCMOS/LVTTL interface levels.
14,
15
XTAL_OUT,
XTAL_IN
Input
Parallel resonant crystal interface. XTAL_OUT is the output,
XTAL_IN is the input.
16
V_EE
Power
Negative supply pin.
17
TEST_CLK Input Pulldown LVCMOS/LVTTL clock input.
Selects between crystal or TEST_CLK inputs as the the PLL Reference
18 nXTAL_SEL Input Pulldown source. Selects XTAL inputs when LOW. Selects TEST_CLK when HIGH.
LVCMOS/LVTTL interface levels.
20, 21 nQ3, Q3 Output
Differential output pair. LVPECL interface levels.
23, 24 Q2, nQ2 Output
Differential output pair. LVPECL interface levels.
NOTE: Pulldown and Pullup refers 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
843004AG-02
www.icst.com/products/hiperclocks.html
2
REV. A JULY 20, 2005