ICS840021I Datasheet, PDF (2/11 Pages) Integrated Circuit Systems – FEMTOCLOCKS™ CRYSTAL-TO LVCMOS/LVTTL FREQUENCY SYNTHESIZER

Integrated
Circuit
Systems, Inc.
ICS840021I
FEMTOCLOCKS™ CRYSTAL-TO-
LVCMOS/LVTTL CLOCK GENERATOR
TABLE 1. PIN DESCRIPTIONS
Number
Name
Type
Description
1
V_DDA
Power
Analog supply pin.
2
OE
Input
Pullup
Output enable pin. When HIGH, Q0 output is enabled.
When LOW, forces Q0 to HiZ state. LVCMOS/LVTTL interface levels.
3, 4
XTAL_OUT,
XTAL_IN
Input
Crystal oscillator interface. XTAL_IN is the input,
XTAL_OUT is the output.
5
nc
Unused
No connect.
6
GND
Power
Power supply ground.
7
Q0
Output
Single-ended clock output. LVCMOS/LVTTL interface levels.
15Ω output impedence.
8
V_DD
Power
Core supply pin.
NOTE: Pullup refers to internal input resistors. See Table 2, Pin Characteristics, for typical values.
TABLE 2. PIN CHARACTERISTICS
Symbol Parameter
C_IN
Input Capacitance
C_PD
Power Dissipation Capacitance
R_PULLUP
R_OUT
Input Pullup Resistor
Output Impedance
Test Conditions
V_DD, V_DDA = 3.465V
V_DD, V_DDA = 2.625V
Minimum
Typical
4
7
7
51
15
Maximum
Units
pF
pF
pF
kΩ
Ω
TABLE 3. CONTROL FUNCTION TABLE
Control Inputs
OE
0
1
Output
Q0
Hi-Z
Active
840021AGI
www.icst.com/products/hiperclocks.html
2
REV. A MAY 19, 2005