14S_03XC2151 02.09.12 16:35 ページ 1023
Series
ICs for use with Crystal Oscillators
ꢁCMOS
: Low Supply Current
■Applications
ꢀCrystal Oscillator Modules
ꢀCommunication Equipment
ꢀMicrocomputers
ꢁOscillator Frequency: 4MHz ~ 70MHz
ꢁBuilt-In Oscillator Capacitors
ꢁDivider Ratio
ꢁ3-State Output
ꢁSupply Voltage
: fo/1, fo/2, fo/4, fo/8
ꢀClock Units in Motor Control
ꢀSystem Clocks on Boards
ꢀTimers
: 5.0V
ꢀPalmtops
ꢁMini Mold SOT-26 Package
■General Description
■Features
The XC2151 series are a group of high frequency, CMOS low power
crystal oscillators with oscillator & divider circuitry, oscillator capacitors
and amplifier feedback resistors built-in.
High Precision
: Built-in oscillator capacitors
16pF TYP (or selectable from 10 ~ 20pF)
: On-chip amplifier feedback resistor
5MΩ TYP (or selectable from 1.6kΩ ~
8.4kΩ)
An oscillator circuit can be created from just an external crystal.
Output frequency can be selected from four frequencies :
Fundamental f0/1, Divided f0/2, f0/4, f0/8.
Oscillator Frequency: 4MHz ~ 70MHz
Divider Ratio
Output
Operating Voltage Range
: 4.0V ~ 6.0V
: Selectable from f0/1, f0/2, f0/4, f0/8
: 3-State, 10 - TTL fanout
The output buffer is 3-State and has a fanout of 10 - TTL.
Small Quiescent Current
Stand-By Function
Low Cost
: Oscillator circuit can be created from just
an external crystal
Ultra Small Package : SOT-26 (150mW) mini mold
■Pin Configuration
■Pin Assignment
PIN NUMBER
PIN NAME
FUNCTION
Control *
Oscillator Connection (Input)
GND
Output
Power Supply
Oscillator Connection (Output)
XT VDD
QO
4�
1
2
3
4
5
6
/INH
XT
5�
6�
V
SS
SOT-26
(TOP VIEW)
Q
0
V
DD
/XT
* Control pin has pull-up resistor built-in.
1
2� 3�
VSS
XT
INH
■INH, Q0 Pin Function
XC2151x51
14
Q0
/INH
"H"
"L"
Output
High Impedance (oscillator stopped)
Output
open
XC2151x55
Q0
/INH
"H"
"L"
Output
High Impedance (oscillator stopped)
Output
"H"= High Level
"L" = Low Level
open
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