CDC421XXX Datasheet, PDF (2/18 Pages) Texas Instruments – FULLY INTEGRATED FIXED FREQUENCY LOW-JITTER, CRYSTAL-OSCILLATOR CLOCK GENERATOR

CDC421xxx
SLAS540 – APRIL 2007
www.ti.com
XIN 1
XIN 2
Crystal
Oscillator
Feedback
Divider
PFD/
Charge Pump
Loop Filter
VCO
Prescaler
Output
Divider
Figure 1. High-Level Block Diagram of the CDC421xxx
B0230-01
PACKAGE (QFN-24)
The CDC421xxx is packaged in a QFN-24 terminal package. The QFN package footprint is shown. Terminal
locations and numbers are shown in Figure 2.
RGE PACKAGE
(TOP VIEW)
CE 1
NC 2
NC 3
NC 4
NC 5
NC 6
CDC421xxx
18 NC
17 V_CC
16 V_CC
15 NC
14 NC
13 NC
P0024-06
Figure 2. Pinout of the CDC421xxx QFN-24 Package
The terminal functions table shows the terminal descriptions for the CDC421xxx QFN-24 package.
TERMINAL
NAME
NO.
V_CC
GND
16, 17
8, 9
XIN 1
21
XIN 2
22
TYPE
Power
GND
I
I
Table 1. TERMINAL FUNCTIONS
ESD
PROTECTION
Y
Y
Y
N
DESCRIPTION
3.3V power supply
Ground
In crystal input mode, connect XIN1 to one end of the crystal and XIN2 to the
other end of the crystal. In LVCMOS single-ended driven mode, XIN1 (pin 21) acts
as input reference and XIN2 should connect to GND.
2
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