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