CDC421A100 Datasheet, PDF (4/15 Pages) Texas Instruments – Fully-Integrated, Fixed-Frequency, Low-Jitter Crystal Oscillator Clock Generator

CDC421AXXX
SCAS875 – MAY 2009 ....................................................................................................................................................................................................... www.ti.com
DEVICE INFORMATION
RGE PACKAGE
QFN-24
(TOP VIEW)
CE 1
NC 2
NC 3
NC 4
NC 5
NC 6
Thermal Pad
(Bottom Side)
CDC421AXXX
18 NC
17 V_CC
16 V_CC
15 NC
14 NC
13 NC
CDC421Axxx Pin Descriptions
TERMINAL
NAME
NO.
V_CC
GND
16, 17
8, 9
XIN1
21
XIN2
22
CE
1
OUTP
OUTN
NC
10
7
2–6, 11–15,
18–20, 23, 24
TYPE
Power
Ground
I
I
I
O
O
—
ESD
PROTECTION
DESCRIPTION
Y
3.3-V power supply
Y
Ground
Y
In crystal input mode, connect XIN1 to one end of the crystal and XIN2 to the
other end of the crystal.
N
In LVCMOS single-ended driven mode, XIN1 (pin 21) acts as input reference
and XIN2 should connect to GND.
Chip enable (LVCMOS input)
Y
CE = 1 enables the device and the outputs.
CE = 0 disables all current sources (LVPECLP = LVPECLN = Hi-Z).
Y
High-speed positive differential LVPECL output. (Outputs are enabled by CE
pin.)
Y
High-speed negative differential LVPECL output. (Outputs are enabled by CE
pin.)
Y
TI test pin. Do not connect; leave floating.
4
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