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NBC12439 Datasheet(PDF) 4 Page - ON Semiconductor

Part No. NBC12439
Description  3.3V/5V Programmable PLL Synthesized Clock Generator
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

NBC12439 Datasheet(HTML) 4 Page - ON Semiconductor

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NBC12439, NBC12439A
http://onsemi.com
4
The following gives a brief description of the functionality of the NBC12439 and NBC12349A Inputs and Outputs. Unless
explicitly stated, all inputs are CMOS/TTL compatible with either pull--up or pulldown resistors. The PECL outputs are capable
of driving two series terminated 50 Ω transmission lines on the incident edge.
Table 3. PIN FUNCTION DESCRIPTION
Pin Name
Function
Description
INPUTS
XTAL1, XTAL2
Crystal Inputs
These pins form an oscillator when connected to an external series--resonant
crystal.
S_LOAD*
CMOS/TTL Serial Latch Input
(Internal Pulldown Resistor)
This pin loads the configuration latches with the contents of the shift registers. The
latches will be transparent when this signal is HIGH; thus, the data must be stable
on the HIGH--to--LOW transition of S_LOAD for proper operation.
S_DATA*
CMOS/TTL Serial Data Input
(Internal Pulldown Resistor)
This pin acts as the data input to the serial configuration shift registers.
S_CLOCK*
CMOS/TTL Serial Clock Input
(Internal Pulldown Resistor)
This pin serves to clock the serial configuration shift registers. Data from S_DATA
is sampled on the rising edge.
P_LOAD**
CMOS/TTL Parallel Latch Input
(Internal Pullup Resistor)
This pin loads the configuration latches with the contents of the parallel inputs
.The latches will be transparent when this signal is LOW; therefore, the parallel
data must be stable on the LOW--to--HIGH transition of P_LOAD for proper opera-
tion.
M[6:0]**
CMOS/TTL PLL Loop Divider
Inputs (Internal Pullup Resistor)
These pins are used to configure the PLL loop divider. They are sampled on the
LOW--to--HIGH transition of P_LOAD. M[6] is the MSB, M[0] is the LSB.
N[1:0]**
CMOS/TTL Output Divider Inputs
(Internal Pullup Resistor)
These pins are used to configure the output divider modulus. They are sampled
on the LOW--to--HIGH transition of P_LOAD.
OE**
CMOS/TTL Output Enable Input
(Internal Pullup Resistor)
Active HIGH Output Enable. The Enable is synchronous to eliminate possibility of
runt pulse generation on the FOUT output.
FREF_EXT*
CMOS/TTL Input
(Internal Pulldown Resistor)
This pin can be used as the PLL Reference
XTAL_SEL**
CMOS/TTL Input
(Internal Pullup Resistor)
This pin selects between the crystal and the FREF_EXT source for the PLL refer-
ence signal. A HIGH selects the crystal input.
PWR_DOWN
CMOS/TTL Input
(Internal Pulldown Resistor)
PWR_DOWN forces the FOUT outputs to synchronously reduce frequency by a
factor of 16.
OUTPUTS
FOUT, FOUT
PECL Differential Outputs
These differential, positive--referenced ECL signals (PECL) are the outputs of the
synthesizer.
TEST
CMOS/TTL Output
The function of this output is determined by the serial configuration bits T[2:0].
POWER
VCC
Positive Supply for the Logic
The positive supply for the internal logic and output buffer of the chip, and is con-
nected to +3.3 V or +5.0 V.
PLL_VCC
Positive Supply for the PLL
This is the positive supply for the PLL and is connected to +3.3 V or +5.0 V.
GND
Negative Power Supply
These pins are the negative supply for the chip and are normally all connected to
ground.
--
Exposed Pad for QFN--32 only
The Exposed Pad (EP) on the QFN--32 package bottom is thermally connected to
the die for improved heat transfer out of package. The exposed pad must be at-
tached to a heat--sinking conduit. The pad is electrically connected to GND.
* When left Open, these inputs will default LOW.
** When left Open, these inputs will default HIGH.


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