ROHM BU2192F Datasheet
1
Multimedia ICs
Clock generator for personal
computers
BU2192F
The BU2192F is a clock generator IC for personal computers, and uses a single crystal resonator to generate the
three clock signals needed for personal computers.
•
Applications
Personal computers
•
Features
1) Clock signals of two different types can be generated with a single attached crystal generator.
2) Internal PLL loop filter, eliminating the need for an
attached component.
3) Single 5V power supply.
4) SOP 8-pin package.
•
Block diagram
XTAL
OSC
DATA1
DATA2
PLL1
1 / 2
1 / 4
CLK1
33.8680MHz
24.5795MHz
CLK2
PLL2
VREF
XTAL1
14.3181MHz
2
Multimedia ICs BU2192F
•
Pin descriptions
Pin No. Pin name Function Circuit
1
2
3
4
5
6
7
8
CLK2
GND
XTAL I
N.C.
CLK1
N.C.
DV
DD
AVDD
Clock output 2 (f2 = 24.5795MHz)
GND
Reference oscillation input
Clock output 1 (f1 = 33.8680MHz)
Digital power supply
Analog power supply
A
—
B
—
A
—
—
—
—
—
•
Input / output circuits
Pin
From inside
Pin
To inside
Type A Type B
1 • 5 3
•
Absolute maximum ratings (Ta = 25°C)
•
Recommended operating conditions (Ta = 25°C)
Parameter Symbol Limits Unit
Applied voltage
Input voltage
Storage temperature
Power dissipation
V
DD
VIN
Tstg
Pd
– 0.5 ~ + 7.0
– 0.5 ~ V
DD + 0.5
– 30 ~ + 125
450
∗
V
V
°C
mW
䊊 Do not represent guaranteed performance.
∗
Reduced by 4.5mW for each increase in Ta of 1°C over 25°C.
䊊 Not designed for radiation resistance.
Parameter Symbol Limits Unit
Power supply voltage
Input high level voltage
Input low level voltage
Operating temperature
Output load
V
DD
VIH
VIL
Topr
CL
– 4.5
0.8 × V
DD
0.0
– 5
~ + 5.5
~ V
DD
~ 0.2 × VDD
~ + 70
V
V
V
°C
pF
15 (Max.)
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