Multimedia ICs
Clock generator for video CD systems
BU2173F
The BU2173F is an IC that generates the CPU clock signal, system clock signal and video clock signal used in video
CD systems. A single crystal resonator can generate three different oscillation frequencies.
•
Applications
Video CD systems
•
Featuresfrequency clock signals can be generated
1) Three
with a single attached crystal resonator.
2) Two internal PLL channels.
3) Internal loop filter, eliminating the need to attach a
loop.
4) Single 5.0V power supply.
5) SOP 18-pin package.
•
Block diagram
XTALI
XTALO
13.5MHz
DATA1A
M
U
X
DATA1B
1/2
PLL1
F
OUT
1
40.5MHz
XTAL
OSC.
1/4
F
OUT
4
3.375MHz
DATA2A
1/3
DATA2B
M
U
X
DATA2C
1/2
PLL2
M
U
X
F
OUT
2
27.0MHz
or
28.6363MHz
or
28.375MHz
DATA2D
Vref
CTRLC
CTRLB
CTRLA
A
VDD
A
VSS
V
DD
V
SS
V
DDIO
V
SSIO
TEST
TSTI
TSTO
F
OUT
3
1
Multimedia ICs
BU2173F
•
Pin description
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Pin name
V
DD
TSTO
XTALI
XTALO
CTRLA
CTRLB
CTRLC
TSTI
V
SS
A
VSS
F
OUT
3
V
SSIO
F
OUT
2
TEST
F
OUT
1
V
DDIO
F
OUT
4
A
VDD
Digital V
DD
Open in the normal mode (used for testing)
Reference oscillation input
Reference oscillation output
GD-G / VCD clock switching
Stays at the high level when the IC is in the normal mode
CD-G PAL / NTSC clock switching
Connect to Vss when the IC is in the normal mode (used for testing)
Digital ground
Analog ground
Not used (open when the IC is in the normal mode)
I / O ground
Clock output 2
Setting the test mode (connect to Vss when the IC is in the normal mode)
Clock output 1
I / O V
DD
Clock output 4
Analog V
DD
Function
Type
—
B
C
C
A
A
A
A
—
—
B
—
B
A
B
—
B
—
•
Absolute maximum ratings (Ta = 25°C)
Parameter
Power supply voltage
Power dissipation
Operating temperature
Storage temperature
Symbol
V
DD
Pd
Topr
Tstg
Limits
– 0.3 ~ + 7.0
450
– 5 ~ + 70
– 25 ~ + 125
Unit
V
mW
°C
°C
∗
Reduced by 4.5 mW for each increase in Ta of 1°C over 25°C.
•
Recommended operating conditions (Ta = 25°C)
Parameter
Power supply voltage
Input high level voltage
Input low level voltage
Operating temperature
Symbol
V
DD
, A
VDD
, V
DDIO
V
IH
V
IL
Topr
Limits
4.75 ~ 5.25
0.8V
DD
~ V
DD
0.0 ~ 0.2V
DD
– 5 ~ + 70
Unit
V
V
V
°C
2
Multimedia ICs
BU2173F
•
Input / output circuits
Type A
Type C
Pin
Pin
To inside
Type B
Pin
Pin
From inside
To inside
•
Electrical characteristics (unless otherwise noted, Ta = 25°C, V
Parameter
Input current, low level
Input current, high level
Input voltage, low level
Input voltage, high level
Output voltage, low level
Output voltage, high level
Operating supply current
Reference frequency
Output frequency
(1)
Symbol
I
IL
I
IH
V
IL
V
IH
V
OL
V
OH
I
DD
f
REF
f
1
f
2A
Output frequency
(2)
f
2B
f
2C
Output frequency
Jitter
Reference frequency
Output frequency
(2)
(1)
f
REF2
f
1B
f
2D
Output frequency
(2)
f
2E
Output frequency
(4)
f
4B
—
—
28.636
3.579
—
—
(4)
f
4
Min.
– 300.0
– 300.0
—
4.0
—
2.4
—
—
—
—
—
—
—
—
—
—
—
Typ.
0.0
0.0
—
—
—
—
30
13.5
40.5
27.000
28.375
28.636
3.375
1.0
14.318
40.5
27.000
Max.
300.0
300.0
1.0
—
0.5
—
50
—
—
—
—
—
—
—
—
—
—
DD
= 5.0V, A
VDD
= 5.0V, IO
VDD
= 5.0V)
Unit
µA
µA
V
V
V
V
mA
MHz
MHz
MHz
MHz
MHz
MHz
ns
MHz
MHz
MHz
MHz
MHz
I
OL
= 4.0mA
I
OH
= – 4.0mA
f
XTAL
= 13.5 MHz, no load
Use with CTRLB at the high level
f
1
= f
REF
×
96 / 16 / 2
f
2A
= f
REF
×
96 / 16 / 3
CTRLA = H, CTRLB = H, CTRLC = H
f
2B
= f
REF
×
227 / 54 / 2
CTRLA = L, CTRLB = H, CTRLC = L
f
2C
= f
REF
×
140 / 33 / 2
CTRLA = L, CTRLB = H, CTRLC = H
f
4
= f
REF
×
1 / 4
Measure at f
2A
, f
2B
, f
2C
(reference)
Use with CTRLB at the low level
f
1B
= f
REF2
×
98 / 35 / 2
f
2D
= f
REF2
×
98 / 35 / 3
CTRLA = H, CTRLB = L, CTRLC = H
f
2E
= f
REF2
×
80 / 20 / 2
CTRLA = L, CTRLB = L, CTRLC = H
f
4B
= f
REF2
×
1 / 4
Conditions
—
—
—
—
3
Multimedia ICs
BU2173F
•
Measurement circuit
R1
1
X1
R2
1MΩ
2
3
4
C1
10pF
C2
10pF
5
6
7
Control A
Control C
8
9
V
DD
TSTO
XTALI
XTALO
CTRLA
CTRLB
CTRLC
TSTI
V
SS
A
VDD
F
OUT
4
V
DDIO
F
OUT
1
TEST
F
OUT
2
V
SSIO
F
OUT
3
A
VSS
18
120Ω
17
16
15
14
13
12
11
10
Clock output (2)
Clock output (1)
Clock output (4)
f
REF
= 13.5MHz
Note: Certain crystal resonators may require setting
XTALI and XTALO to the optimum allowable values.
•
Application example
f
REF
= 13.5MHz
R1
1
X1
R2
1MΩ
2
3
4
C1
10pF
C2
10pF
5
6
7
Control A
Control C
8
9
V
DD
TSTO
XTALI
XTALO
CTRLA
CTRLB
CTRLC
TSTI
V
SS
A
VDD
F
OUT
4
V
DDIO
F
OUT
1
TEST
F
OUT
2
V
SSIO
F
OUT
3
A
VSS
18
120Ω
17
16
15
14
13
12
11
10
Clock output (2)
Clock output (1)
Clock output (4)
Note: Certain crystal resonators may require setting
XTALI and XTALO to the optimum allowable values.
∗
This IC should be used mounted on a PC board. If mounted in
a socket, characteristics of the IC may be adversely affected.
4
Multimedia ICs
BU2173F
effectively low,
and to enhance signal stability by separating
A
VDD
and D
VDD
with an impedance. Be sure to
attach.
R2:
Needed to provide a feedback resistance for
the crystal resonator
C1 / C2: When f
0
must be adjusted according to the
crystal resonator used, or when the crystal
resonator results in unnecessary oscillation
points, attach a PF and adjust according to
the value for this capacitor.
X1:
Use a crystal resonator with an oscillation fre-
quency of 13.5 MHz or 14.318 MHz.
VDD
•
Attached componentsvoltage of A
R1:
To keep the
•
External dimensions (Units: mm)
11.2
±
0.2
18
7.8
±
0.3
5.4
±
0.2
10
1
1.8
±
0.1
9
0.11
1.27
0.4
±
0.1
0.3Min.
0.15
SOP18
0.15
±
0.1
5
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