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LMX2310U Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2310U
Description  PLLatinum™ Ultra Low Power Frequency Synthesizer for RF Personal Communications
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LMX2310U Datasheet(HTML) 4 Page - National Semiconductor (TI)

 
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Pin Descriptions (Continued)
Pin Number
Pin Name
I/O
Description
I/O Circuit Configuration
11
NC
— No Connect.
12
Data
I
High impedance CMOS Data input. Serial
Data is entered MSB first. The last two
bits are the address for the target
registers. The Data is internally referenced
to V
µC.
13
LE
I
High impedance CMOS LE input. When
Latch Enable goes HIGH, data stored in
the 22-bit shift register is loaded into one
the 3 control registers, based on the
address field. The Latch Enable is
internally referenced to V
µC.
14
GND
— Digital ground.
15
CE
I
High impedance CMOS Chip Enable
input. Provides logical power-down control
of the device. Pull-up to V
µC if unused.
The Chip Enable is internally referenced
to V
µC.
16
V
µC
— Power supply for MICROWIREcircuitry.
Must be
≤ V
CC. Typically connected to
same supply level as microprocessor or
baseband controller to enable
programming at low voltages.
17
NC
— No Connect.
18
V
CC
— Power supply voltage input. Input may
range from 2.7V to 5.5V. Bypass
capacitors should be placed as close as
possible to this pin and be connected
directly to the ground plane.
19
FL
O Fastlock mode output. In Fastlock mode
this pin is at logic low. When not in
Fastlock mode, this pin is in TRI-STATE
mode. This pin can also be forced to
TRI-STATE, forced low or forced high by
the programming of the first two-bits of the
Timeout Counter.
20
V
P
— Power supply for charge pump. Must be
V
CC.
www.national.com
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