ICS843251I-12 Datasheet, PDF (2/12 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V LVPECL CLOCK GENERATOR

Integrated
Circuit
Systems, Inc.
PRELIMINARY
ICS843251I-12
FEMTOCLOCKS™ CRYSTAL-TO-3.3V, 2.5V
LVPECL CLOCK GENERATOR
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1
V_CCA
Power
Analog supply pin.
2
V_EE
Power
3, 4
XTAL_OUT,
XTAL_IN
Input
Negative supply pin.
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
5
FREQ_SEL Input Pullup Frequency select pin. LVCMOS/LVTTL interface levels.
6, 7
nQ, Q
Output
Differential clock outputs. LVPECL interface levels.
8
V_CC
Power
Core supply pin.
NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol
C_IN
R_PULLUP
Parameter
Input Capacitance
Input Pullup Resistor
Test Conditions
Minimum
Typical
4
51
Maximum
Units
pF
kΩ
843251BGI-12
www.icst.com/products/hiperclocks.html
2
REV. A JANUARY 10, 2006